JP2000002318A - Control valve for lubrication circuit - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To suppress a set load error and set due to an error in a mounting length of a coil spring of a lubricating circuit control valve, and to obtain a necessary amount of lubricating oil even at a low oil pressure. In a state in which the hydraulic pressure of the ATF does not act on the small-diameter passage, a ball is urged by a coil spring to seal an opening portion of the small-diameter passage. Block the flow to When oil is added from the small diameter passage 41 by the operation of the oil pump, the ball 5
2 moves, the opening 41a is opened, and the ATF flows into the large-diameter passage 51, flows from the outside of the coil spring 53 to the inside of the coil spring 53 through between the windings, or the ATF plugs from the outside of the coil spring 53. End face 54 of 54
a through the slit 54c, and the orifice 5 of the plug 54
It is sent to each lubrication unit via 4b. Coil spring 5
Even when 3 is in close contact, the ATF is sent out to each lubricating section through the slit 54c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control valve for a lubrication circuit for restricting the flow of lubricating oil from one side to the other side.

[0002]

2. Description of the Related Art Conventionally, in a lubricating circuit circulated by an oil pump such as an automatic transmission, when the oil pump is stopped, lubricating oil in the lubricating circuit is prevented from flowing down (drainback). Is equipped with a control valve that functions as a check valve.

[0003] Such a check valve of a lubricating circuit of an automatic transmission, as shown in FIG.
A large-diameter passage 101 is formed in the lubrication circuit, and the large-diameter passage 10 is formed.
1, a ball 103 capable of sealing a small-diameter passage 102 on a side where lubricating oil is pressure-fed by an oil pump (not shown).
The ball 103 is locked at one end, and the small-diameter passage 1 is fixed.
A coil spring 104 that urges toward the opening of No. 02 and allows the lubricating oil from the ball 103 to flow in between the windings from the outside to the inside and to flow out to the other end, and the other end of the coil spring 104 to the end face 105a. A flow hole (orifice) 1 which is locked and formed in the center of the end face 105a.
And a plug 105 from which lubricating oil can flow out.

When the oil pump is stopped, the ball 103 is moved to the opening of the small-diameter passage 102 by the coil spring 104 so that the opening of the small-diameter passage 102 is sealed. The flow of the lubricating oil to the side 102 is regulated.

When the oil pump is operated, as shown in FIG. 6B, the oil pressure of the lubricating oil supplied by the oil pump causes the ball 103 to move from the opening of the small-diameter passage 102 so that the lubricating oil is released. 102 to large diameter passage 101
The fluid flows into the inside of the coil spring 104 from the outside of the coil spring 104 to the inside of the coil spring 104 through between the windings, and is sent out to the lubricating parts such as the rotating element and the clutch via the orifice 105b of the plug 105.

[0006]

In the above-described check valve of the automatic transmission lubricating circuit, when the diameter of the orifice 105b of the plug 105 is increased to increase the amount of lubricating oil, FIG. As shown in (2), since the windings of the coil spring 104 come into close contact with each other and block the lubrication circuit, there is a problem that the amount of lubricating oil is limited.

To solve this problem, it is conceivable to increase the spring load of the coil spring 104. However, if the set load of the spring load is increased, the check valve is opened against the urging force of the coil spring 104. The required hydraulic pressure rises and lubricating oil cannot be obtained at low hydraulic pressure. Also, the increase in spring constant
To promote an error in the set load due to an error in the installation length of the coil spring 104, or
There is a possibility that the set-back function is promoted to impair the drain back prevention function itself.

The present invention has been made in view of the above circumstances, and suppresses an error in set load and a set of a coil spring due to an error in a mounting length of a coil spring, and obtains a necessary amount of lubricating oil even at a low oil pressure. It is another object of the present invention to provide a lubrication circuit control valve in which the amount of lubricating oil can be easily and optimally set only by adjusting the diameter of a flow hole of a plug without being affected by the spring load of a coil spring.

[0009]

In order to achieve the above object, a lubricating circuit control valve according to the present invention is provided on a side of a small diameter passage of a large diameter passage of a lubrication circuit. A ball whose portion can be sealed, and the ball is locked at one end to urge the ball toward the opening of the small-diameter passage, and lubricating oil from the ball side flows in from the outside to the inside through between the windings. A lubricating circuit control valve comprising: a coil spring that flows out to an end side; and a plug that locks the other end of the coil spring at an end face and allows the lubricating oil to flow out of a flow hole formed in the center of the end face. A flow groove is formed in the end face of the plug to connect the outside of the coil spring and the flow hole.

[0010] The lubricating circuit control valve according to claim 1 is
When no oil pressure is applied from the small diameter passage, the ball is urged by the coil spring to seal the opening of the small diameter passage and cut off the flow from the large diameter passage side to the small diameter passage side.
When hydraulic pressure is applied from the small-diameter passage, the hydraulic pressure causes the ball to move against the urging force of the coil spring, and the opening of the small-diameter passage is opened, so that lubricating oil flows from the small-diameter passage to the large-diameter passage. Into the coil spring from the outside of the coil spring to between the windings, or to the inside of the coil spring from the outside of the coil spring, through the flow groove formed in the end face of the plug, through the flow hole of the plug, and the rotating element, clutch, etc. To each lubrication unit. Here, even if the oil pressure from the small-diameter passage increases and the coil spring comes into close contact, the lubricating oil passes from the outside of the coil spring through the flow groove formed in the end face of the plug, and is sent out to the lubricating parts through the flow hole of the plug. Therefore, it is possible to lubricate each part of the lubrication.

According to a second aspect of the present invention, there is provided a lubricating circuit control valve according to the first aspect, wherein the flow groove is formed as a cross-shaped groove centered on the flow hole. So that the required amount of lubricating oil can be easily obtained.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 relate to an embodiment of the present invention, and FIG. 1 is an explanatory diagram of the operation of a check valve in a lubrication circuit;
2 is a schematic configuration diagram of an automatic transmission, FIG. 3 is a cross-sectional view of a main part around a check valve, FIG. 4 is an explanatory diagram showing a configuration of a lubricating circuit for a lubricating portion, and FIG. 5 is a structural explanatory diagram of a plug.

The control valve according to the present invention is applied to, for example, an automatic transmission mounted on an automobile, and in this embodiment, the automatic transmission shown in FIG. 2 will be described as an example. In this automatic transmission, a transmission case 3 is joined to the rear of the torque converter case 1 and the differential case 2, and an extension case 4 is joined to the rear of the transmission case 3. An oil pan 5 for storing automatic transmission oil (ATF) is attached to a lower portion of the transmission case 3.

A torque converter 7 having a lock-up clutch 6 is provided inside the torque converter case 1 and is connected to a crankshaft 8 a of an engine 8. The transmission case 3
, An automatic transmission mechanism 9 is disposed, and an input shaft 10 of the automatic transmission mechanism 9 is connected to an output element of the torque converter 7. The input shaft 10 and the output shaft (transmission output shaft) 11 of the automatic transmission mechanism 9 are disposed coaxially.
Are connected to the center differential device 12 inside the extension case 4.

The automatic speed change mechanism 9 is configured to obtain four forward speeds and one reverse speed by two sets of front planetary gears 13 and rear planetary gears 14, and includes a high clutch 15, a reverse clutch 16, a multiple disc brake 17,
Low clutch 18, low and reverse brake 19,
The one-way clutches 20 are arranged in parallel, and by selectively engaging these one-way clutches, four forward speeds and one reverse speed are obtained.

In the transmission case 3, a front drive shaft 21 is disposed parallel to the input shaft 10 and the transmission output shaft 11, and a front end of the front drive shaft 21 is connected to a front end of the differential case 2. The front drive shaft 21 is connected to the center differential device 12 via a pair of reduction gears 23 and 24, while being connected to a differential device 22 to transmit driving force to the front wheels.

The above-mentioned center differential device 12
Is a compound planetary gear type differential device having a first sun gear 25 formed on the transmission output shaft 11 and a second sun gear 27 formed on a rear drive shaft 26 at the rear of the center differential device 12. The driving force is output from the center differential device 12 to the rear drive shaft 26 via the transfer clutch 28, and the driving force is transmitted from the rear drive shaft 26 to the rear wheels via the propeller shaft 29, the rear differential device 30, and the like.

Between the first sun gear 25 and the second sun gear 27, a gear train of a plurality of pinions rotatably supported by a carrier 31 is interposed. The first pinion 32 is meshed with the first sun gear 25, and the large-diameter second pinion 33 behind the gear train is meshed with the second sun gear 27.

The transmission output shaft 11 is rotatably inserted into the carrier 31 from the front, while the rear drive shaft 26 is rotatably inserted from the rear, and the reduction gear 23 is connected to the front end. The output from the carrier 31 to the front wheels is configured.

On the other hand, an oil pump housing 34a is interposed between the rear end of the torque converter case 1 at the center front side of the automatic transmission mechanism 9 and the front end of the transmission case 3, and the oil pan 5 An oil pump 34 is provided for pumping the ATF stored in the unit to each part.

The drive shaft 35 of the oil pump 34 and the impeller sleeve 7a of the torque converter 7 are connected, and the oil pump 34 is constantly driven by being directly connected to the engine. The input shaft 10 is rotatably supported coaxially with the crankshaft 8a of the engine 8 via a bush by a hollow support 34c formed at the center of an oil pump cover 34b covering the oil pump housing 34a. Have been.

The AT discharged from the oil pump 34
F is controlled to an optimum line pressure or pilot pressure by a control valve 36 housed in the oil pan 5, and the torque converter 7, valves, clutches,
It is supplied as hydraulic oil for brakes and gears and lubricating oil for each part.

More specifically, as shown in FIG. 4, the ATF discharged from the oil pump 34 is
A pressure regulator valve 36a for adjusting the oil discharged from 4 to an optimal line pressure according to the traveling state;
It is sent to a check valve 50 as an example of a control valve according to the present invention via a torque converter regulator valve 36b for preventing the torque converter pressure from becoming excessive, and in particular, each clutch, brake, gear, etc. of the automatic transmission mechanism 9 The lubricating parts are lubricated and circulated through the oil pan 5, and from the torque converter regulator valve 36b to the engine cooling radiator via a lock-up control valve 36c that activates or deactivates the lock-up clutch 6 of the torque converter 7. Built-in oil cooler 37
And is circulated to the oil pan 5 by lubricating the lubricating parts of the center differential device 12.

Hereinafter, the vicinity of the check valve 50 will be described. As shown in FIG. 3, the input shaft 10 connecting the torque converter 7 and the automatic transmission mechanism 9 is formed of a hollow shaft, and a seal 37 is roll-pin-connected inside the hollow shaft.
The torque converter side (front end side) 10a forms a drain circuit of a lock-up mechanism, and the rear end side 10b forms an oil passage of a lubrication circuit to each lubricating portion. Oil holes 10c are radially formed at a plurality of locations on the rear end side 10b. Has been drilled. The transmission output shaft 11 is also formed of a hollow shaft, and the inside is an oil passage.

Oil pump 3 for supporting the input shaft 10
A clutch drum base 39 of the clutch drum 38 of the high clutch 15, which is spline-fitted to the input shaft 10, is slidably provided around a rear end side outer periphery of the support 34c of the support 34c. A thrust bearing 4 is provided at a portion where the end face contacts the clutch drum base 39.
0 is provided.

The support 34c of the oil pump 34 is provided with a check valve 50 for supplying the ATF from the oil pump 34 through an oil passage (small diameter passage) 41. Is supplied to lubricating parts via oil holes 39a and 39b formed in the clutch drum base 39, and the lubricating parts are lubricated.

In FIG. 3, reference numeral 42 denotes the high clutch 15
Reference numeral 43 denotes a piston of the reverse clutch 16.

The check valve 50 is shown in FIGS. 1 (a), (b),
As shown in each figure of FIG.
An oil passage 51 having a large diameter is formed, a ball 52 capable of sealing the opening 41a of the small-diameter passage 41 in the large-diameter passage 51, and the ball 52 is locked at one end to form the small-diameter oil passage 51. The ball 5 is urged toward the opening 41a of the passage 41 and
A coil spring 53 for allowing the ATF from the two sides to flow in from the outside to the inside through the respective windings and flowing out to the other end, and the other end of the coil spring 53 is locked at the end face 54a and formed substantially in the center of the end face 54a. Flow hole (orifice)
And a plug 54 from which the ATF can flow out of the plug 54b.

As shown in FIG. 5, the plug 54 of the check valve 50 has a cross-shaped flow groove formed around an orifice 54b substantially at the center on an end surface 54a where the coil spring 53 is locked. A slit 54c is formed, and the slit 54c is formed from outside the coil spring 53.
The ATF can be introduced into the orifice 54b through the port c. Therefore, the plug 54 allows the ATF from the inside of the coil spring 53 to flow out through the orifice 54b.
The ATF from the outside can also flow out of the orifice 54b directly through the slit 54c.

The operation of the present embodiment will be described below. In the automatic transmission having the above configuration, the power of the engine 8 is input to the automatic transmission mechanism 9 via the torque converter 7 and the input shaft 10, and the output of the automatic transmission mechanism 9 is input from the transmission output shaft 11 to the center differential device 12. As a result, the driving force is transmitted to the front wheels via the front differential device 22, and the driving force is transmitted to the rear wheels via the rear differential device 30.

At the same time, the oil pump 34 directly connected to the engine
The ATF stored in the oil pan 5 is pressurized by
It is supplied as hydraulic oil for the torque converter 7, valves, clutches, brakes, gears, etc., and lubricating oil for each part.

The ATF of the lubricating circuit circulating through each clutch, brake, gear, etc., is regulated by the control valve 36 and has a small diameter passage 41 of the support 34 c of the oil pump 34.
And transmitted to the check valve 50, and particularly to the automatic transmission mechanism 9
The lubricating parts of the clutches, brakes, gears, etc. are lubricated and circulated through the oil pan 5, while the control valve 3
The lubricating oil is sent to the oil cooler 37 built in the radiator for cooling the engine via the lubrication unit 6, and is circulated to the oil pan 5 by lubricating the lubricating parts of the center differential device 12.

Next, the operation of the check valve 50 in each operating state of the oil pump 34 will be described with reference to FIG. First, in a state where the oil pump 34 is stopped, FIG.
As shown in FIG. 7, the biasing force of the coil spring 53 of the check valve 50 moves the ball 52 to the opening 41a of the small-diameter passage 41, seals the opening 41a of the small-diameter passage 41, and closes the large-diameter passage 51. The flow of the ATF from the air passage toward the small-diameter passage 41 is restricted (a drain-back preventing state holding the ATF).

Next, when the oil pump 34 operates,
As shown in FIG. 1 (b), the ball 52 of the check valve 50 causes the plug 54 from the opening 41a of the small diameter passage 41 to resist the urging force of the coil spring 53 by the oil pressure of the ATF sent from the oil pump 34. To the oil pump 3
4 flows into the large-diameter passage 51 from the small-diameter passage 41, passes between the windings from the outside of the coil spring 53 to the inside of the coil spring 53, passes through the orifice 54b of the plug 54, and passes through the thrust bearing 40.
The oil is supplied to the lubricating parts such as the rotating element and the clutch via the oil holes 39a and 39b in the vicinity. At the same time, ATF
From the outside of the coil spring 53, through the slit 54c formed in the plug 54, through the orifice 54b of the plug 54, and through the oil hole 3 near the thrust bearing 40.
Via 9a, 39b, it is sent to each lubricating part such as a rotating element and a clutch.

In this state, when the oil pressure of the ATF sent from the oil pump 34 further increases, the ball 52 of the check valve 50 is actuated by the oil pressure of the ATF as shown in FIG.
Is further moved from the opening 41a of the small-diameter passage 41 toward the plug 54 against the urging force of the coil spring 53,
The coils of the coil spring 53 are brought into close contact with each other. In this state, the ATF passing between the windings of the coil spring 53
Is interrupted, but the ATF is
3, through the slit 54 c formed in the end face 54 a of the plug 54, through the orifice 54 b of the plug 54, and through the oil holes 39 a, 39 near the thrust bearing 40.
The lubricating oil is sent to the lubricating parts such as the rotating element and the clutch via b.

As described above, according to the present embodiment, the end surface 54a of the plug 54 for locking the coil spring 53
And the orifice 54b from outside the coil spring 53
The slits 54c for maintaining the flow of the ATF to the coil 54 are formed.
F can be circulated, and the spring constant of the coil spring 53 can be reduced. As a result, it is possible to suppress an error in the set load due to an error in the installation length of the coil spring 53 and a set of the coil spring 53, and to optimally set the spring load of the coil spring 53 to reduce the hydraulic pressure. The required amount of lubricating oil can be obtained from Further, the orifice 54b of the plug 54 is not affected by the spring load of the coil spring 53.
The lubricating oil amount can be easily and optimally set only by adjusting the diameter of the lubricating oil.

A slit 54 formed in the plug 54
Since c is formed by providing a cross-shaped groove in the plug end face 54a, it can be easily configured, and even if the windings of the coil spring 53 are brought into close contact with each other due to an increase in hydraulic pressure, the necessary and sufficient amount of lubricating oil Can be secured.

In the present embodiment, a check valve applied to an automatic transmission has been described as an example. However, the present invention is not limited to this, and a check valve used in another transmission such as a manual transmission may be used. The same is applicable. Further, the slit formed in the plug 54 may be a single character, a U-shaped, or another shape other than the cross shape.

[0039]

As described above, according to the first aspect of the present invention, the plug constituting the lubricating circuit control valve is formed on the end face of the plug that locks the coil spring, at the center of the end face of the plug from outside the coil spring. A flow groove is formed to keep the flow of the lubricating oil into the flow hole, so that even if the ball moves to the plug side due to the increase in the oil pressure of the lubricating oil and the windings of the coil spring come into close contact, the lubricating oil flows. This allows the spring constant of the coil spring to be kept low.

Since the spring constant of the coil spring can be kept low, errors in the set load due to an error in the installation length of the coil spring and sag of the coil spring are suppressed, and the necessary lubrication is required even when the hydraulic pressure is low. The amount of oil can be obtained, and the amount of lubricating oil can be easily and optimally set only by adjusting the diameter of the flow hole of the plug regardless of the spring load of the coil spring.

According to the second aspect of the present invention, the flow groove formed in the plug is formed by providing a cross-shaped groove on the end face of the plug centering on the flow hole. In addition to the effects, the flow grooves can be simply formed, and even if the windings of the coil spring come into close contact with each other due to an increase in hydraulic pressure, the required amount of lubricating oil can be sufficiently secured.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the operation of a check valve in a lubrication circuit.

FIG. 2 is a schematic configuration diagram of an automatic transmission.

FIG. 3 is a sectional view of a main part around a check valve.

FIG. 4 is an explanatory diagram showing a configuration of a lubrication circuit for a lubrication part.

FIG. 5 is a structural explanatory view of a plug.

FIG. 6 is a diagram illustrating the operation of a check valve in a conventional lubrication circuit.

[Explanation of symbols]

 41 small diameter passage 41a opening 50 check valve (lubricating circuit control valve) 51 large diameter passage 52 ball 53 coil spring 54 plug 54a end face 54b orifice (flow hole) 54c slit (flow groove)

Claims (2)

[Claims] 1. A ball provided on a side of a small-diameter passage of a large-diameter passage in a lubrication circuit, the opening of the small-diameter passage being sealable, and the opening of the small-diameter passage being locked to one end of the ball. A coil spring that urges the lubricating oil from the ball side from the outside to the inside through between the windings and allows the lubricating oil to flow out from the other end to the other end. A lubricating circuit control valve comprising a plug capable of allowing the lubricating oil to flow out of the flow hole formed in the lubricating circuit, wherein a flow groove communicating the outside of the coil spring and the flow hole is formed in the end face of the plug. A control valve for a lubrication circuit, comprising: 2. The lubrication circuit control valve according to claim 1, wherein the flow groove is formed as a cross-shaped groove centered on the flow hole.