JP2018141520A - Parking mechanism of transmission for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make compatible both P-come/off prevention at a P-range stop of a vehicle on a slope, and the reduction of a P-come/off force when selecting the other range position from a P-range position.SOLUTION: A parking mechanism A of a transmission for a vehicle in which a parking pole 77 is fit to a parking gear 78 of a variator output shaft 41 when selecting a P-range position by a shift lever 70 comprises a parking rod 74 and a wedge 75. The parking rod 74 is connected to a detent plate 73 at one end, and extends toward the parking pole 77 at the other end. The wedge 75 is attached to a position of the other end of the parking rod 74 so as to be movable in an energized state, and maintains fitment by contacting with and supporting the parking pole 77 during the selection at the P-range position. A wedge stopper mechanism for regulating the movement of the wedge 75 to a direction in which the fitment of the parking gear 78 and the parking pole 77 is released during the selection of the P-range position is arranged.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a parking mechanism for a vehicle transmission in which a parking pole is fitted to a parking gear of a transmission output shaft when a parking range position is selected by a shift lever.

  2. Description of the Related Art Conventionally, a parking rod that moves based on a driver's shift lever operation and a parking pole that can be engaged with a parking gear based on the movement of the parking rod are provided. A parking device for a transmission in which a parking gear and a parking pole are fitted when a shift lever is operated to a parking range position (hereinafter abbreviated as “P range position”) is known (see, for example, Patent Document 1). ).

JP 2001-253324 A

  In the conventional apparatus, when the vehicle stops at the P range position on a gradient road, a load based on the road gradient (torque to rotate the driving wheel by the vehicle weight) acts between the parking pole and the parking gear. In order to prevent a parking loss (hereinafter abbreviated as “P disconnection”) in which the parking pole is detached from the parking gear due to a load based on the road surface gradient, a fitting taper angle between the parking gear and the parking pole is set. However, if the fitting taper angle is set so that it does not come off even when the P range stops at a steep slope, the P omission can be prevented, but parking is possible when selecting from the P range position to another range position. The parking pulling force (hereinafter abbreviated as “P pulling force”) required to pull out the parking pole from the gear increases. As a result, there has been a problem that a large operating force is required when the driver performs a selection operation from the P range position to another range position by an operating force applied to the shift lever.

  The present invention has been made paying attention to the above problem, and is compatible with both prevention of P dropout when stopping on the P range on a slope road and reduction of P pulling force when selecting another range position from the P range position. An object of the present invention is to provide a parking mechanism for a vehicle transmission that achieves the above.

In order to achieve the above object, the present invention provides a parking mechanism for a vehicle transmission in which a parking pole is fitted to a parking gear of a transmission output shaft when a parking range position is selected by a shift lever. And a wedge.
The parking rod has one end connected to a member that operates in conjunction with the selection operation to the shift lever, and the other end extends toward the parking pole.
The wedge is movably attached to the position of the other end portion of the parking rod so as to be movable, and maintains the fitting by contacting and supporting the parking pole during the selection of the parking range position.
Wedge regulating means is provided for regulating the movement of the wedge in the direction in which the engagement between the parking gear and the parking pole is released during the selection of the parking range position.

That is, the present inventor has analyzed the mechanism of the occurrence of P omission, and when the P range stops on a slope road, the wedge that contacts and supports the parking pole is pushed from the parking pole and moves along the parking rod. Was found to be included.
Focusing on this point, a wedge restricting means is provided for restricting the movement of the wedge in the direction in which the engagement between the parking gear and the parking pole is released during the selection of the parking range position. In other words, the P removal prevention measure that does not increase the P removal force only by restricting the movement of the wedge in the P removal direction.
As a result, it is possible to achieve both the prevention of P dropout when the P range stops on a slope road and the reduction of the P pulling force when selecting another range position from the P range position.

1 is an overall configuration diagram showing a drive system configuration of an engine vehicle equipped with a belt type continuously variable transmission (an example of a vehicle transmission) to which a parking mechanism of Example 1 is applied. It is a side view which shows the whole structure when the P range position is selected in the parking mechanism of Example 1. It is a top view which shows the whole structure when the P range position is selected in the parking mechanism of Example 1. It is a perspective view which shows the state which the wedge stopper mechanism is act | operating during selection of the P range position in the parking mechanism of Example 1. It is a top view which shows the part of a detent plate when the P range position is selected in the parking mechanism of Example 1. It is a top view by the partial cross section which shows the part of a wedge and a support member when P range position is selected in the parking mechanism of Example 1. FIG. It is mechanism explanatory drawing which shows the P omission mechanism in the parking mechanism of the transmission for vehicles. It is a top view which shows the part of a detent plate when the R range position is selected in the parking mechanism of Example 1. It is a top view by the partial cross section which shows the part of a wedge and a support member when R range position is selected in the parking mechanism of Example 1. FIG. It is a top view by the partial cross section which shows the part of a wedge and a support member when P range position is selected in the parking mechanism of Example 2. FIG. It is a top view by the partial cross section which shows the part of a wedge and a support member when R range position is selected in the parking mechanism of Example 2. FIG.

  BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode for realizing a parking mechanism for a vehicle transmission according to the present invention will be described based on Example 1 and Example 2 shown in the drawings.

First, the configuration will be described.
The parking mechanism according to the first embodiment is applied to an engine vehicle equipped with a belt-type continuously variable transmission. When a parking range position is selected by a shift lever, a parking pole is fitted to a parking gear of a transmission output shaft. . Hereinafter, the configuration of the first embodiment will be described by dividing it into “a drive system configuration of the engine vehicle”, “a whole configuration of the parking mechanism”, and “a detailed configuration of the wedge stopper mechanism”.

[Drive system configuration of engine car]
FIG. 1 shows a drive system configuration of an engine vehicle equipped with a belt type continuously variable transmission to which a parking mechanism for a vehicle transmission according to a first embodiment is applied. Hereinafter, the drive system configuration of the engine vehicle will be described with reference to FIG.

  As shown in FIG. 1, the drive system of the engine vehicle includes an engine 1, a torque converter 2, a forward / reverse switching mechanism 3, a variator 4, a final reduction mechanism 5, and drive wheels 6 and 6. Yes. The belt type continuously variable transmission (vehicle transmission) is configured as a transmission unit in which the torque converter 2, the forward / reverse switching mechanism 3, the variator 4, and the final reduction mechanism 5 are housed in a transmission case 10.

  The torque converter 2 is a starting element having a function of increasing input torque from the engine 1. The torque converter 2 includes a lock-up clutch 20 that is engaged when a torque increasing function is not required. When the lockup clutch 20 is in the clutch released state, torque transmission between the engine output shaft 11 and the torque converter output shaft 21 is performed via the fluid of the torque converter 2. When the clutch is completely engaged, the engine output shaft 11 and the torque converter output shaft 21 are directly connected. The torque converter 2 is a so-called three-element one-stage two-phase type including a pump impeller 23, a turbine runner 24, and a stator 26 as constituent elements. The pump impeller 23 is connected to the engine output shaft 11 via the converter housing 22. The turbine runner 24 is connected to the torque converter output shaft 21. The stator 26 is disposed between the pump impeller 23 and the turbine runner 24 and is provided in the case via a one-way clutch 25.

  The forward / reverse switching mechanism 3 is a mechanism that switches the input rotation direction to the variator 4 between a forward rotation direction during forward travel and a reverse rotation direction during reverse travel. The forward / reverse switching mechanism 3 includes a double pinion planetary gear 30, a forward clutch 31, and a reverse brake 32. Here, the forward clutch 31 is engaged when a forward travel range position such as a D range position is selected. The reverse brake 32 is engaged when a reverse travel range position such as an R range position is selected. When the N range position or the P range position is selected, both the forward clutch 31 and the reverse brake 32 are released.

  The variator 4 is a belt-type continuously variable transmission mechanism that continuously changes the speed ratio (= the ratio between the variator input rotational speed and the variator output rotational speed) by changing the belt contact diameter. The variator 4 includes a primary pulley 42, a secondary pulley 43, and a pulley belt 44.

  The primary pulley 42 includes a pair of fixed pulleys 42 a and a slide pulley 42 b that are arranged coaxially with the variator input shaft 40. Here, the variator input shaft 40 is connected to the carrier of the double pinion planetary gear 30 and is arranged coaxially with the engine output shaft 11 and the torque converter output shaft 21. The slide pulley 42b slides by the primary pressure guided to the primary pressure chamber 45 at the time of shifting.

  The secondary pulley 43 includes a pair of fixed pulleys 43 a and a slide pulley 43 b that are arranged on the same axis as the variator output shaft 41. Here, the variator output shaft 41 is connected to the final reduction mechanism 5 and provided in a parallel arrangement separated from the variator input shaft 40 by a predetermined distance. The slide pulley 43b is slid by the secondary pressure guided to the secondary pressure chamber 46 at the time of shifting.

  The pulley belt 44 is stretched between a sheave surface that forms a V shape of the primary pulley 42 and a sheave surface that forms a V shape of the secondary pulley 43. The pulley belt 44 includes two sets of laminated rings and a large number of elements that are attached in an annular form by being sandwiched along the two sets of laminated rings. The two sets of laminated rings are configured by overlapping a large number of annular rings from the inside to the outside. Each element is formed of a punched plate material. The pulley belt 44 may be a chain-type belt in which a large number of chain elements arranged in the pulley traveling direction are coupled by pins penetrating in the pulley axial direction.

  The final deceleration mechanism 5 is a mechanism that provides a deceleration function and a differential function for decelerating the rotation speed from the variator output shaft 41 and increases the power output from the variator 4 to distribute it to the left and right drive wheels 6 and 6. . The final reduction mechanism 5 includes an output gear 52 provided on the variator output shaft 41, an idler gear 53 and a reduction gear 54 provided on the idler shaft 50, and a final gear 55 as a reduction gear mechanism. A differential gear mechanism 56 is provided as a mechanism that exhibits a differential function that allows differential rotation of the left and right drive wheels 6 and 6 during turning.

  Here, the variator output shaft 41 is provided with a parking gear 78 at a position adjacent to the output gear 52. A parking pole 77 is disposed at the outer peripheral position of the parking gear 78. The parking pole 77 is controlled to be fitted and released from the parking gear 78 by a parking mechanism. The overall configuration of the parking mechanism will be described next.

[Overall configuration of parking mechanism]
2 and 3 show the overall configuration when the P range position is selected in the parking mechanism A of the first embodiment. Hereinafter, the overall configuration of the parking mechanism A will be described with reference to FIGS. 2 and 3.

  2 and 3, the parking mechanism A includes a shift lever 70, a motion conversion mechanism 71, a detent shaft 72, a detent plate 73, a parking rod 74, a wedge 75, a support member 76, A parking pole 77 and a parking gear 78 are provided. In the parking mechanism A, when the P range position is selected by a driver operation on the shift lever 70, the parking pole 77 is fitted to the parking gear 78 of the variator output shaft 41 (transmission output shaft). In other words, at the P range position, the parking gear 78 and the parking pole 77 are engaged, and the parking operation state is established in which the variator output shaft 41 is restrained from rotating. The parking mechanism A is a linkage system in which the shift lever 70 to the parking pole 77 are mechanically coupled.

  The shift lever 70 is an operation member that is disposed at a position that can be operated by the driver in the vehicle interior and that selects the P range position, the R range position, the N range position, the D range position, and the L range position. Here, the “R range position” refers to the reverse range position. The “N range position” refers to a neutral range position. “D range position” refers to the drive range position. The “L range position” refers to a low gear ratio fixed range position.

  The motion conversion mechanism 71 is a mechanism for converting the swinging motion of the lever end by the range position selection operation by the shift lever 70 into the rotational motion of the detent shaft 72. As the motion conversion mechanism 71, a link mechanism, a combination mechanism of a link mechanism and a wire mechanism, or the like is used.

  The detent plate 73 is a plate that is fixed to the detent shaft 72 and rotates around the detent shaft 72 as a rotation center axis in conjunction with a selection operation on the shift lever 70. As shown in FIG. 3, the detent plate 73 has a detent mechanism 79 for producing a sense of moderation in the selection operation to the P range position, R range position, N range position, D range position, and L range position. Is provided. As shown in FIG. 3, the detent mechanism 79 includes a plurality of range grooves 79a, 79b, 79c, 79d, and 79e formed on the end surface of the plate, and a detent spring 79f pressed against the range groove corresponding to the selection operation position. Is configured. 79a is a P range groove, 79b is an R range groove, 79c is an N range groove, 79d is a D range groove, and 79e is an L range groove.

  The parking rod 74 is a rod member in which one end 74 a is connected to the detent plate 73 that is interlocked with the selection operation to the shift lever 70 and the other end 74 b extends toward the parking pole 77. One end 74a of the parking rod 74 is rotatably inserted into a hole formed in the detent plate 73, and the other end 74b is a large-diameter end so as to exhibit a stopper function that restricts the movement of the wedge 75. Yes. The parking rod 74 moves in the right direction in FIGS. 2 and 3 when selecting from another range position to the P range position, and left in FIGS. 2 and 3 when selecting from the P range position to another range position. Move in the direction.

  The wedge 75 is a waiting function member that is movably attached to an inner position of the other end 74 b of the parking rod 74. A through hole is formed in the wedge 75 at the center axis position, and the wedge 75 can be moved by being inserted through the parking rod 74. Further, the wedge 75 is given a biasing force in a direction in which the wedge 75 comes into contact with the other end 74 b of the parking rod 74 by the coil spring 80. During the selection of the P range position, the other end portion 77 b of the parking pole 77 is supported in contact with the wedge 75, thereby maintaining the fitting of the parking pole 77 and the parking gear 78.

  The support member 76 is fixed at a position where the wedge 75 is disposed, and guides and supports the surface of the wedge 75 opposite to the surface with which the other end 77b of the parking pole 77 contacts so as to be linearly movable. The support member 76 is fixed to the transmission case 10 by two bolts 81. The support member 76 has a cylindrical guide support surface 76 a that receives the wedge 75. The support member 76 guides and supports the wedge 75, and as a result, becomes a member that receives the other end 74b of the parking rod 74 to which the wedge 75 is attached.

  The parking pole 77 is provided so as to be swingable with respect to the transmission case 10 via a pole pin 82. One end of the parking pole 77 has a fitting claw 77 a that fits into the tooth recess 78 a of the parking gear 78. The other end 77 b of the parking pole 77 has an arcuate surface shape so as to come into contact with the wedge 75. Between the parking pole 77 and the pin support bracket 83, there is provided a spring 84 on which a biasing force acts in the direction of increasing the contact force between the other end 77b of the parking pole 77 and the wedge 75. A stopper pin 85 that restricts the maximum displacement angle when the parking pole 77 is disengaged from the parking gear 78 is fixed to the transmission case 10 at the outer peripheral position of one end of the parking pole 77.

  As described above, the parking gear 78 is the variator output shaft 41 and is fixed at a position adjacent to the output gear 52. When the P-range position is selected, the fitting pawl 77a of the parking pole 77 is fitted into the tooth recess 78a of the parking gear 78. The fitting taper angle between the tooth recess 78a and the fitting pawl 77a has a resistance to slipping. The angle is set to be smaller.

  Although not shown in the drawings, the parking mechanism A includes a misoperation prevention mechanism and a shift lock mechanism as safety devices. The erroneous operation prevention mechanism is a mechanism that prevents the selection operation from the D range position to the P range position or the R range position unless the knob provided on the shift lever 70 is pressed. This erroneous operation prevention mechanism is configured by a combination of a lock pin interlocked with a knob operation and a control bracket to which the vehicle body is attached. The shift lock mechanism is a mechanism that disables the selection operation from the P range position to another range position when the brake is not depressed. This shift lock mechanism is constituted by a shift lock solenoid or the like provided at a position where the movement of the parking rod 74 can be restricted.

[Detailed configuration of wedge stopper mechanism]
FIG. 4 shows a state where the wedge stopper mechanism is operating during the selection of the P range position in the parking mechanism A of the first embodiment. FIG. 5 shows a portion of the detent plate 73 when the P range position is selected in the parking mechanism A of the first embodiment, and FIG. 6 shows a portion of the wedge 75 and the support member 76. The detailed configuration of the wedge stopper mechanism will be described below with reference to FIGS.

  Here, the “wedge stopper mechanism” is an example of a wedge restricting means for restricting the movement of the wedge 75 in the direction in which the engagement between the parking gear 78 and the parking pole 77 is released during the selection of the P range position. is there. That is, among the wedge regulating means, the one having a stopper capable of regulating the movement of the wedge 75 and performing the regulation operation and the regulation release operation by the stopper in conjunction with the selection operation of the shift lever 70 is called a “wedge stopper mechanism”. . The “wedge stopper mechanism” is provided as a safety device for the parking mechanism A in addition to the existing erroneous operation prevention mechanism and the shift lock mechanism.

  As shown in FIGS. 4 to 6, the wedge stopper mechanism according to the first embodiment includes an advance / retreat stopper 90 (stopper) provided on a support member 76 that guides and supports the wedge 75, and a first spring built in the support member 76. 91 (biasing means), and a connecting rod 92 (link member) for connecting the detent plate 73 and the support member 76.

  As shown in FIGS. 4 and 6, the wedge 75 includes a large-diameter conical surface 75a with a gentle inclination angle toward the parking pole 77, a conical surface 75b with a large inclination angle continuous from the large-diameter conical surface 75a, A small-diameter cylindrical surface 75c continuous from the surface 75b is provided on the outer peripheral surface.

  The large-diameter conical surface 75a contacts and supports the other end 77b of the parking pole 77 when the P range position is selected. The conical surface 75b supports and supports the other end 77b of the parking pole 77 while the tooth crest surfaces of the parking pole 77 and the parking gear 78 are in contact with each other during the selection operation from the other range position to the P range position. And wait. The small-diameter cylindrical surface 75c contacts and supports the other end 77b of the parking pole 77 when a range position other than the P range position is selected. The wedge 75 has a wedge end surface 75d urged by the coil spring 80 on the large-diameter conical surface 75a side.

  As shown in FIGS. 4 and 6, the support member 76 includes a bottom wall 76b having a guide support surface 76a, a first vertical wall 76c having a thick wall thickness standing from one end of the bottom wall 76b, and a bottom And a second vertical wall 76d having a thin wall thickness standing from the other end of the wall 76b. The guide support surface 76 a receives the lower surface of the large-diameter conical surface 75 a of the wedge 75. The first vertical wall inner surface 76e and the second vertical wall inner surface 76f receive both side surfaces of the large-diameter conical surface 75a of the wedge 75.

  The advance / retreat stopper 90 is provided in a stopper hole 76g formed in the first vertical wall 76c of the support member 76, and is a stopper capable of contacting / separating with the wedge 75. The advance / retreat stopper 90 can contact the wedge 75 by advancing and retreating, and as shown in FIG. 6, a stopper surface 90a that can face the wedge end surface 75d, and an inclined surface 90b formed on the back surface of the stopper surface 90a. And having. The inclination angle of the inclined surface 90b is set to an angle at which the advance / retreat stopper 90 can be pushed down by the component force of the pressing force when the tip of the other end 92b of the connecting rod 92 presses the inclined surface 90b.

  The first spring 91 is a biasing means that is provided in a stopper hole 76 g formed in the first vertical wall 76 c and biases the advance / retreat stopper 90 toward the wedge 75. The first spring 91 is a coil spring that is interposed between the bottom surface 90c of the advance / retreat stopper 90 and the spring receiver 93 and has a spring end fixed so that the advance / retreat stopper 90 does not fall off.

  The connecting rod 92 is a link member capable of applying to the advance / retreat stopper 90 a force that opposes the urging force of the first spring 91 in conjunction with the selection operation of the shift lever 70. As shown in FIG. 5, one end 92 a of the connecting rod 92 is provided so as to be slidable along a notch slit 94 formed in the detent plate 73. The tip of the other end 92b of the connecting rod 92 can contact the inclined surface 90b of the advance / retreat stopper 90 as shown in FIG.

  As shown in FIG. 5, the notch slit 94 includes a first arc-shaped slit portion 94a and a second arc-shaped slit portion 94b that communicate with each other. The first arc-shaped slit portion 94 a is formed by an arc-shaped slit having an equal radius centered on the shaft axis of the detent shaft 72. When the shift lever 70 is in the operation range from the D range position to the R range position, the one end portion 92a of the connecting rod 92 slides on the first arcuate slit portion 94a. The second arcuate slit portion 94b is formed by an arcuate slit that gradually shifts from the first arcuate slit portion 94a toward the P range position to a small radius. When the shift lever 70 is in the operation range from the R range position to the P range position, the one end portion 92a of the connecting rod 92 slides on the second arcuate slit portion 94b.

  As shown in FIG. 6, the other end 92b of the connecting rod 92 is inserted into a rod insertion hole 76h formed in the first vertical wall 76c in a direction orthogonal to the stopper hole 76g. The other end 92 b of the connecting rod 92 can move back and forth in a direction parallel to the moving direction of the parking rod 74 in accordance with the selection operation of the shift lever 70. The distal end surface of the connecting rod 92 is in the retracted position shown in FIG. 6 during the selection of the P range position. When the selection operation from the P range position to the R range position is performed, the distal end surface of the connecting rod 92 moves forward in the right direction in FIG. 6 and abuts against the inclined surface 90b to push the advance / retreat stopper 90 downward. While the selection operation from the R range position to the L range position is performed, the distal end surface of the connecting rod 92 is in the forward movement position (see FIG. 9), and the forward / backward stopper 90 is kept pressed down. In addition, the front end surface of the connecting rod 92 has, for example, a spherical shape so that the contact with the inclined surface 90b is smooth.

Next, the operation will be described.
The operation of the first embodiment will be described by dividing it into “a parking omission prevention operation when stopping on a slope road” and “another characteristic operation of the parking mechanism”.

[Prevention of parking loss when stopping on a slope]
First, a mechanism that causes “P dropout” in which the parking pole is detached from the parking gear due to a load based on the road gradient when the vehicle stops at the P range position on a slope road will be described with reference to FIG.

  When the P range is stopped on an uphill road, the driving wheel receives a load (torque to rotate the driving wheel by the vehicle weight) based on the road surface gradient in the direction indicated by arrow B in FIG. This road surface load torque is transmitted from the drive wheel to the parking gear, and the road surface load torque in the direction shown by the arrow B 'in FIG. 7 acts on the parking gear. When the P range stops on the downhill road, the driving wheels are received in the direction indicated by the arrow C in FIG. This road surface load torque is transmitted from the drive wheel to the parking gear, and the road surface load torque in the direction indicated by the arrow C 'in FIG. 7 acts on the parking gear. The road surface load torque indicated by the arrow B 'or the arrow C' acts as a force in the direction of pulling the parking pole against the fitting portion between the parking pole and the parking gear. For this reason, when the fitting pawl of the parking pole receives a force in the direction of pulling out the parking pole, it becomes a force to turn the parking pole in the direction of arrow D in FIG. 7, and the wedge is in contact with the other end of the parking pole. push. Therefore, if the road surface load torque is large and the force pushing the wedge by the parking pole is large, the wedge pushed by the parking pole moves in the direction of arrow E in FIG. 7 while contracting the coil spring. When the wedge moves in the direction of the arrow E in FIG. 7, the contact position of the other end of the parking pole is lowered from the large-diameter conical surface of the wedge to a position along the conical surface, and the parking pole moves to the arrow D in FIG. Rotate in the direction. When the amount of rotation of the parking pole in the direction of arrow D in FIG. 7 reaches a predetermined amount, so-called “P omission” occurs in which the parking pole is disengaged from the engagement state with the parking gear.

  In order to prevent this P omission, conventionally, attention has been paid to the omission resistance between the parking pole and the parking gear, and measures to increase the omission resistance between the parking pole and the parking gear are taken. For example, the fitting taper angle of the parking gear and parking pole can be removed to change the resistance to a large angle, the taper angle of the large conical surface of the wedge can be changed to a large resistance, or the wedge surface can be resisted by slipping. The lube light processing which increases is done.

  However, even if the P range is stopped at a steep slope, increasing the drop resistance so that the P drop does not occur can prevent the P drop, but as a side effect, selecting from the P range position to another range position. When the operation is performed, the P pulling force required to pull out the parking pole from the parking gear increases. In other words, in the case of a measure for increasing the slipping resistance, it is impossible to achieve both prevention of P slipping and reduction of the P pulling force.

  On the other hand, the present inventor analyzed the mechanism by which the P dropout occurred. When the P range stopped on the slope road, the wedge supporting the parking pole was pushed from the parking pole and moved along the parking rod. It was found that the action to be included.

  Focusing on this point, in the first embodiment, a configuration is provided in which a wedge stopper mechanism that restricts the movement of the wedge 75 in the direction in which the engagement between the parking gear 78 and the parking pole 77 is released during the selection of the P range position. It was.

  That is, during the selection of the P range position, the leading end surface of the connecting rod 92 is in a standby state at the retracted position shown in FIG. Therefore, as shown in FIGS. 4 and 6, the advance / retreat stopper 90 is urged by the first spring 91 and protrudes toward the wedge 75 from the first vertical wall inner surface 76e. Due to the protrusion of the advance / retreat stopper 90, the stopper surface 90a of the advance / retreat stopper 90 and the wedge end face 75d of the wedge 75 face each other, and the wedge 75 moves in a direction in which the engagement between the parking gear 78 and the parking pole 77 is released. Is regulated. In other words, even if a force that pushes the wedge 75 from the parking pole 77 is applied by the road surface load torque, the movement of the wedge 75 pushed by the parking pole 77 is caused by the contact between the stopper surface 90a of the advance / retreat stopper 90 and the wedge end surface 75d of the wedge 75. It is regulated by touching. For this reason, the so-called “P omission” that the parking pole 77 is disengaged from the fitted state with the parking gear 78 is prevented.

  Next, when a selection operation from the P range position to the R range position is performed, the distal end surface of the connecting rod 92 moves forward in the right direction in FIG. 6 and comes into contact with the inclined surface 90 b of the advance / retreat stopper 90. After the distal end surface of the connecting rod 92 abuts on the inclined surface 90b, when the amount of advance in the right direction is increased, the inclined surface 90b is pushed to resist the biasing force from the first spring 91. Press 90 down. When the shift lever 70 reaches the R range position, the connection position of the one end 92a of the connecting rod 92 is changed from the second arcuate slit 94b of the notch slit 94 to the first arcuate slit as shown in FIG. Transition to part 94a. On the other hand, when the shift lever 70 reaches the R range position, the advance / retreat stopper 90 sinks to a position lower than the first vertical wall inner surface 76e of the support member 75 as shown in FIG. Thereafter, when the shift lever 70 is selected and operated from the R range position to the L range position, the advance / retreat stopper 90 is maintained in a state where it is depressed to a position lower than the first vertical wall inner surface 76e of the support member 75. This is because the connecting position of the one end portion 92a of the connecting rod 92 is the first arcuate slit portion 94a, and the position of the distal end surface of the connecting rod 92 does not change.

  In this way, only the P range position is selected, and only the movement of the wedge 75 is restricted, and the P removal prevention measure that does not increase the P removal force is adopted. For this reason, it is possible to achieve both the prevention of P dropout when the P range stops on a slope road and the reduction of the P pulling force when selecting another range position from the P range position. And, in the case of the linkage type parking mechanism A as in the first embodiment, the operating force of the driver when selecting another range position from the P range position is reduced as compared with a measure for increasing the slipping resistance. be able to.

[Other features of parking mechanism]
In the first embodiment, the wedge restricting means includes an advance / retreat stopper 90 that can restrict the movement of the wedge 75, and the restriction operation and the release operation by the advance / retreat stopper 90 are performed in conjunction with the selection operation of the shift lever 70. The mechanism.

  That is, the restriction operation and the restriction release operation by the advance / retreat stopper 90 are mechanically performed in conjunction with the selection operation of the shift lever 70. Therefore, the wedge stopper mechanism can be a mechanism that operates reliably and inexpensively without requiring an actuator that performs the restriction operation and the restriction release operation by the stopper.

  In the first embodiment, the wedge stopper mechanism is provided on the support member 76, and the advance / retreat stopper 90 capable of contacting / separating with the wedge 75 and the support member 76, and the advance / retreat stopper 90 is biased toward the wedge 75. The first spring 91 is connected to the shift lever 70, and the connecting rod 92 can be applied to the advance / retreat stopper 90 with a force opposed to the urging force of the first spring 91.

  That is, the support member 76 that guides and supports the wedge 75 so as to be linearly movable is provided as an existing member in the parking mechanism A. Therefore, by using a wedge stopper mechanism that utilizes the existing support member 76 in the parking mechanism A, the wedge stopper mechanism can be provided while minimizing the design change of the parking mechanism A.

  In the first embodiment, the link member is a connecting rod 92 whose one end 92 a is connected to the detent plate 73 and whose other end 92 b can come into contact with the advance / retreat stopper 90.

  That is, as a member interlocked with the operation of the shift lever 70, there is a parking rod 74 having one end 74a connected to the detent plate 73 and the other end 74b extending toward the parking pole 77. For this reason, the connecting rod 92 can be arranged in the parking mechanism A in parallel with the existing parking rod 74. Therefore, the wedge stopper mechanism having the connecting rod 92 can be provided while minimizing the expansion of the existing space where the parking mechanism A is set.

  In the first embodiment, one end of the connecting rod 92 is provided so as to be slidable along a notch slit 94 formed in the detent plate 73. The notch slit 94 coincides with the operation area other than the position where the shift lever 70 is in the P range position, and the first arc slit portion 94a is formed by a constant radius arc centered on the detent shaft 72, and the shift lever 70 is moved from the R range position to the P range. And a second arc slit portion 94b formed by an arc whose radius gradually decreases from the first arc slit portion 94a toward the P range position.

  That is, when the shift lever 70 is in the operating region other than the P range position, the connecting rod 92 is stopped at the advanced position, and the connecting rod 92 is moved backward only when the shift lever 70 is in the operating range from the R range position to the P range position. A moving operation can be performed. Therefore, it is possible to control the operation of the advance / retreat stopper 90 to a desired operation while having a simple configuration in which the notch slit 94 is formed in the detent plate 73.

  In the first embodiment, the stopper can be brought into contact with the wedge 75 by advancing and retreating, and has a stopper surface 90a that can face the wedge end surface 75d, and an inclined surface 90b formed on the back surface of the stopper surface 90a. A stopper 90 is used. The other end 92 b of the connecting rod 92 can be brought into contact with the inclined surface 90 b of the advance / retreat stopper 90.

  That is, the urging force of the first spring 91 can be applied in the protruding direction of the advance / retreat stopper 90 by separating the other end 92 b of the connecting rod 92 from the inclined surface 90 b of the advance / retreat stopper 90. The advancing / retreating stopper 90 can be pushed down by the connecting rod 92 by bringing the other end portion 92 b of the connecting rod 92 into contact with the inclined surface 90 b of the advance / retreat stopper 90. Therefore, the forward / backward movement of the connecting rod 92 can be easily converted into the forward / backward movement of the forward / backward stopper 90 by having the inclined surface 90 b in the forward / backward stopper 90.

Next, the effect will be described.
In the parking mechanism A of the vehicle transmission in the first embodiment, the effects listed below can be obtained.

(1) A parking mechanism A for a vehicle transmission in which a parking pole 77 is fitted to a parking gear 78 of a transmission output shaft (variator output shaft 41) when a P range position is selected by a shift lever 70, and includes a parking rod 74 and a wedge 75.
The parking rod 74 has one end connected to a member (detent plate 73) interlocked with the selection operation to the shift lever 70 and the other end extending toward the parking pole 77.
The wedge 75 is movably attached to the position of the other end portion of the parking rod 74, and maintains the fitting by contacting and supporting the parking pole 77 during the selection of the P range position.
A wedge stopper mechanism (wedge restricting means) is provided for restricting the movement of the wedge 75 in the direction in which the engagement between the parking gear 78 and the parking pole 77 is released during the selection of the P range position.
For this reason, it is possible to achieve both the prevention of P dropout when the P range stops on a slope road and the reduction of the P pulling force when selecting another range position from the P range position.

(2) The wedge restricting means has a stopper (advance / retreat stopper 90) that can restrict the movement of the wedge 75, and the restricting operation and the releasing operation by the stopper (advance / retreat stopper 90) are interlocked with the selection operation of the shift lever 70. This is a wedge stopper mechanism.
For this reason, in addition to the effect of (1), the wedge stopper mechanism can be a mechanism that reliably operates at low cost without requiring an actuator that performs the restriction operation and the restriction release operation by the stopper.

(3) A support member 76 that is fixed at a position where the wedge 75 is disposed and that guides and supports the opposite surface of the wedge 75 to the surface with which the parking pole 77 contacts is movably linearly movable.
The wedge stopper mechanism is provided on the support member 76 and can be contacted / separated from the wedge 75 (advance / retreat stopper 90), and the support member 76 is provided with the stopper (advance / retreat stopper 90) facing the wedge 75. A force that opposes the urging force of the urging means (first spring 91) in conjunction with the operation of the urging means (first spring 91) and the shift lever 70 can be applied to the stopper (advance / retreat stopper 90). A link member (connecting rod 92).
For this reason, in addition to the effect of (2), the wedge stopper mechanism can be provided while minimizing the design change of the parking mechanism A by making the parking mechanism A utilize the existing support member 76. Can do.

(4) A detent plate 73 provided on the detent shaft 72 that rotates in conjunction with the selection operation to the shift lever 70 is connected to one end 74a of the parking rod 74.
The link member is a connecting rod 92 having one end 92a connected to the detent plate 73 and the other end 92b abutting against a stopper (advance / retreat stopper 90).
For this reason, in addition to the effect of (3), the wedge stopper mechanism having the connecting rod 92 can be provided while minimizing the expansion of the existing space where the parking mechanism A is set.

(5) One end portion 92 a of the connecting rod 92 is provided so as to be slidable along a notch slit 94 formed in the detent plate 73.
The notch slit 94 is formed so that the shift lever 70 coincides with the operation region other than the P range position, the first arc slit portion 94a is formed by an equiradial arc centered on the detent shaft 72, and the shift lever 70 is moved from the R range position to the P range. And a second arc slit portion 94b formed by an arc whose radius gradually decreases from the first arc slit portion 94a toward the P range position.
For this reason, in addition to the effect of (4), the operation of the stopper (advance / retreat stopper 90) can be controlled to a desired operation while having a simple configuration in which the notch slit 94 is formed in the detent plate 73.

(6) The stopper can contact the wedge 75 by advancing and retreating, and the advancing / retreating stopper 90 having a stopper surface 90a capable of facing the wedge end surface 75d and an inclined surface 90b formed on the back surface of the stopper surface 90a. It is. The other end 92 b of the connecting rod 92 can be brought into contact with the inclined surface 90 b of the advance / retreat stopper 90.
For this reason, in addition to the effect of (4) or (5), the forward / backward movement of the connecting rod 92 can be easily converted into the forward / backward movement of the forward / backward stopper 90 by having the inclined surface 90b in the forward / backward stopper 90. Can do.

  The second embodiment is an example in which a rotation stopper is employed as a stopper of the wedge stopper mechanism in place of the advance / retreat stopper of the first embodiment.

First, the configuration will be described.
The “drive system configuration of the engine vehicle” and the “entire configuration of the parking mechanism” of the second embodiment are the same as the configuration of the first embodiment shown in FIGS. The “detailed configuration of the wedge stopper mechanism” of the second embodiment will be described below.

[Detailed configuration of wedge stopper mechanism]
10 shows a portion of the wedge 75 and the support member 76 when the P range position is selected in the parking mechanism A of the second embodiment, and FIG. 11 shows the wedge 75 when the R range position is selected and A portion of support member 76 is shown. Hereinafter, based on FIG.10 and FIG.11, the detailed structure of the wedge stopper mechanism of Example 2 is demonstrated.

  As shown in FIGS. 10 and 11, the wedge stopper mechanism of the second embodiment includes a rotation stopper 95 (stopper) provided on a support member 76 that guides and supports the wedge 75, and a second spring built in the support member 76. 96 (biasing means) and a connecting rod 97 (link member) for connecting the detent plate 73 and the support member 76.

  The rotation stopper 95 is a stopper provided in a stopper hole 76i formed in the first vertical wall 76c and capable of contacting / separating from the wedge 75. The rotation stopper 95 can contact the wedge 75 by rotation about the stopper shaft 98, and as shown in FIG. 10, a stopper plate surface 95a that can face the wedge end surface 75d, and a stopper plate surface 95a. And a stopper back surface 95b formed on the back surface. The stopper plate surface 95 a is the upper surface of the stopper shaft 98, and the stopper back surface 95 b is the lower surface of the stopper shaft 98.

  The second spring 96 is a biasing means that is provided in a spring hole 76j formed in the first vertical wall 76c and biases the rotation stopper 95 toward the wedge end surface 75d of the wedge 75. The second spring 96 is a coil spring that is interposed between the spring plate surface 95c of the rotation stopper 95 and the spring receiver 99 and has a spring end fixed. The spring plate surface 95c is a lower surface of the stopper plate surface 95a with the stopper shaft 98 interposed therebetween.

  The connecting rod 97 is a link member capable of applying to the rotation stopper 95 a force that opposes the urging force of the second spring 96 in conjunction with the shift lever operation. The connecting rod 97 has the same configuration as the connecting rod 92 of the first embodiment, and one end of the connecting rod 97 is provided so as to be slidable along a notch slit 94 formed in the detent plate 73. The other end 97 b of the connecting rod 97 can abut against the stopper back surface 95 b of the rotation stopper 95.

  Next, the operation of the second embodiment will be described.

  First, during the selection of the P range position, the leading end surface of the connecting rod 97 is in a standby state at the retracted position shown in FIG. Therefore, as shown in FIG. 10, the rotation stopper 95 is biased by the second spring 96 and protrudes from the first vertical wall inner surface 76 e toward the wedge 75. Due to the protrusion of the rotation stopper 95, the stopper surface 95a of the rotation stopper 95 and the wedge end surface 75d of the wedge 75 face each other, and the wedge 75 moves in a direction in which the engagement between the parking gear 78 and the parking pole 77 is released. Is regulated.

  Next, when the selection operation from the P range position to the R range position is performed, the distal end surface of the connecting rod 97 moves forward in the right direction in FIG. 10 and comes into contact with the stopper back surface 95 b of the rotation stopper 95. After the front end surface of the connecting rod 97 abuts against the stopper back surface 95b, when the amount of advance in the right direction is increased, the stopper back surface 95b is pressed to resist the urging force from the second spring 96, and the rotation stopper 95 is rotated. When the shift lever 70 reaches the R range position, the rotation stopper 95 rotates and sinks to a position lower than the first vertical wall inner surface 76e of the support member 75 as shown in FIG. Thereafter, when the shift lever 70 is selected and operated between the R range position and the L range position, the rotation stopper 95 is maintained in a rotating state in which the rotation stopper 95 is depressed to a position lower than the first vertical wall inner surface 76e of the support member 75. .

  Thus, in the second embodiment, the stopper can be brought into contact with the wedge 75 by rotation about the stopper shaft 98, and the stopper plate surface 95a that can face the wedge end surface 75d, and the stopper plate surface 95a The rotation stopper 95 includes a stopper back surface 95b formed on the back surface. The other end 97 b of the connecting rod 97 can be brought into contact with the stopper back surface 95 b of the rotation stopper 95.

That is, by separating the other end 97 b of the connecting rod 97 from the stopper back surface 95 b of the rotation stopper 95, the urging force of the second spring 96 can be applied in the protruding direction in which the rotation stopper 95 restricts the movement of the wedge 75. Then, by bringing the other end 97 b of the connecting rod 97 into contact with the stopper back surface 95 b of the rotation stopper 95, the rotation stopper 95 can be rotated by the connecting rod 97 in the retracting direction that permits the movement of the wedge 75. Therefore, by having the stopper back surface 95 b in the rotation stopper 95, the forward / backward movement operation of the connecting rod 97 can be easily converted into the rotation operation of the rotation stopper 95.
Since other operations are the same as those of the first embodiment, description thereof is omitted.

Next, the effect will be described.
In the parking mechanism A of the vehicle transmission in the second embodiment, in addition to the effects (1) to (5) of the first embodiment, the following effects can be obtained.

(7) The stopper can come into contact with the wedge 75 by rotation about the stopper shaft 98, the stopper plate surface 95a can be opposed to the wedge end surface 75d, and the stopper formed on the back surface of the stopper plate surface 95a. And a rotation stopper 95 having a back surface 95b. The other end 97 b of the connecting rod 97 can be brought into contact with the stopper back surface 95 b of the rotation stopper 95.
For this reason, in addition to the effect of (4) or (5), by having the stopper back surface 95b in the rotation stopper 95, the forward / backward movement operation of the connecting rod 97 can be easily converted into the rotation operation of the rotation stopper 95. .

  As described above, the parking mechanism of the vehicle transmission according to the present invention has been described based on the first and second embodiments. However, the specific configuration is not limited to these examples, and design changes and additions are permitted without departing from the spirit of the invention according to each claim of the claims.

  In the first and second embodiments, the advance / retreat stopper 90 and the rotation stopper 95 are used as stoppers. However, the stopper is not limited to this, and a stopper having another configuration may be used.

  In the first and second embodiments, the first spring 91 and the second spring 96 having a coil spring structure are used as the biasing means. However, the urging means is not limited to this, other elastic members may be used, and further, means for urging by hydraulic pressure or the like may be used.

  In Example 1, 2, the example which uses the connecting rods 92 and 97 as a link member was shown. However, the link member is not limited to this, and may be an example of a link mechanism in which a plurality of links are connected, a combination mechanism of a rod or a link, or the like.

  In the first and second embodiments, an example in which the detent plate 73 is used as a member that interlocks with the selection operation on the shift lever 70 has been described. However, the member interlocked with the selection operation to the shift lever is not limited to this, and another member existing in the operation force transmission path from the shift lever to the parking rod may be used.

  In the first and second embodiments, an example is shown in which a wedge stopper mechanism that performs the restriction operation and the restriction release operation by the stopper in conjunction with the selection operation of the shift lever 70 is used as the wedge restriction means. However, the wedge restricting means is not limited to this, and may be an example of a wedge restricting solenoid that controls a restricting operation and a restriction releasing operation by a solenoid.

  In the first and second embodiments, as the parking mechanism A, an example of a linkage system in which the shift lever 70 to the parking pole 77 are mechanically coupled is shown. However, the parking mechanism is not limited to this. For example, the parking mechanism may be an example of a shift-by-wire parking mechanism in which a shift lever is disconnected and a detent shaft is operated by an actuator. In this case, the maximum output torque of the actuator can be kept low by reducing the P pulling force when selecting another range position from the P range position. Furthermore, the parking operation force transmission path may include an electromagnetic clutch and an actuator, and may be an example of a parking mechanism based on a park-by-wire system of a parking assist device that uses a manual operation and an automatic operation for selecting a P range position. .

  In the first and second embodiments, the parking mechanism of the present invention is applied to an engine vehicle equipped with a belt type continuously variable transmission. However, the parking mechanism of the present invention can be applied to a vehicle equipped with an automatic transmission called step AT, an automatic transmission in which a stepped transmission mechanism and a continuously variable transmission mechanism are combined, and the like. Furthermore, the vehicle can be applied not only to an engine vehicle but also to a hybrid vehicle, an electric vehicle, and the like.

A Parking mechanism 41 Variator output shaft (transmission output shaft)
70 shift lever 71 motion conversion mechanism 72 detent shaft 73 detent plate 74 parking rod 74a one end 74b other end 75 wedge 75d wedge end surface 76 support member 77 parking pole 78 parking gear 90 advance / retreat stopper (stopper)
90a Stopper surface 90b Inclined surface 91 First spring (biasing means)
92 Connecting rod (link member)
92a one end 92b other end 94 cutout slit 94a first arc slit 94b second arc slit 95 rotation stopper (stopper)
95a Stopper plate surface 95b Stopper back surface 96 Second spring (biasing means)
97 Connecting rod (link member)
97a One end 97b Other end 98 Stopper shaft

Claims (7)

When a parking range position is selected by a shift lever, a parking mechanism for a vehicle transmission in which a parking pole is fitted to a parking gear of a transmission output shaft,
A parking rod having one end connected to a member interlocking with the selection operation to the shift lever and the other end extending toward the parking pole;
A wedge that is movably mounted in a biased position at the other end of the parking rod, and maintains the fitting by supporting the parking pole while the parking range position is selected,
Wedge restricting means for restricting movement of the wedge in a direction in which the engagement between the parking gear and the parking pole is released during the selection of the parking range position is provided. mechanism. In the parking mechanism for a vehicle transmission according to claim 1,
The wedge regulating means is a wedge stopper mechanism having a stopper capable of regulating the movement of the wedge, and performing a regulating operation and a regulation releasing operation by the stopper in conjunction with a selection operation of the shift lever. A parking mechanism for a vehicle transmission. In the parking mechanism for a vehicle transmission according to claim 2,
A support member fixed to a position where the wedge is disposed, and supporting and supporting the opposite surface of the wedge so as to be linearly movable on the opposite surface of the parking pole;
The wedge stopper mechanism is
A stopper provided on the support member and capable of contacting / separating with the wedge;
An urging means provided on the support member for urging the stopper toward the wedge;
A parking mechanism for a vehicular transmission, comprising: a link member that is capable of applying to the stopper a force that opposes the urging force by the urging means in conjunction with a selection operation to the shift lever. In the parking mechanism for a vehicle transmission according to claim 3,
Provided on a detent shaft that rotates in conjunction with a selection operation to the shift lever, and includes a detent plate to which one end of the parking rod is connected;
The link member is a connecting rod having one end connected to the detent plate and the other end abuttable against the stopper. In the parking mechanism for a vehicle transmission according to claim 4,
One end of the connecting rod is slidable along a notch slit formed in the detent plate,
The notch slit has a first arc slit portion formed by an equiradial arc centered on the detent shaft, and the shift lever is moved from the reverse range position to the parking range position. A parking mechanism for a vehicular transmission, comprising: a second arc slit portion formed by an arc that conforms to the operation region and has a radius that gradually decreases from the first arc slit portion toward the parking range position. In the parking mechanism for a vehicle transmission according to claim 4 or 5,
The stopper is an advancing / retreating stopper having a stopper surface that can contact the wedge by advancing and retreating, can be opposed to the wedge end surface, and an inclined surface formed on the back surface of the stopper surface,
A parking mechanism for a vehicular transmission, characterized in that the other end of the connecting rod can be brought into contact with the inclined surface of the advance / retreat stopper. In the parking mechanism for a vehicle transmission according to claim 4 or 5,
The stopper is capable of contacting the wedge by rotation around a stopper shaft, and has a stopper plate surface that can face the wedge end surface, and a stopper back surface formed on the back surface of the stopper plate surface. A rotation stopper,
A parking mechanism for a vehicular transmission, wherein the other end portion of the connecting rod can be brought into contact with a back surface of the stopper of the rotation stopper.