JPH0593948U - Power take-off power transmission mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] Power take-out device (PT
O), to provide a PTO power transmission mechanism with excellent assembly workability. According to a first aspect of the power transmission mechanism of a PTO, a valve shaft 3 is slidably inserted into a shift fork 2 and a contact portion 321 that abuts on the shift fork 2.
Have. A guide plate 45 is fixed to the upper surface of the valve shaft 3, and the guide plate 45 slidably makes surface contact with the upper surface of the shift fork 2 and is also fixed to the feed screw 4. In the second invention, the shift fork 2 has a tubular portion arranged on the outer periphery of the valve shaft 3, and a guide groove is provided in the tubular portion to fix the valve shaft 3 and the feed screw 4 in the guide groove. The fixing member of is arranged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a PTO (power take-off) power transmission mechanism, particularly a structure around a valve shaft and a shift fork.

[0002]

[Prior art]

 Specially equipped vehicles such as dump trucks, mixer trucks, and fire trucks require power in addition to the driving purpose. In order to obtain this power, an engine may be installed separately, but the transmission may also be equipped with a power take-off device (power take-off, hereinafter PTO).

FIG. 6 is a conceptual diagram illustrating the entire PTO. The PTO 1 is operated by the drive motor 77 to reciprocate the valve shaft 3, and in conjunction with the valve shaft 3, transmits the dynamic force of the engine 75 received from the transmission counter gear 76 to the oil pump 71. As a result, the hoist cylinder 8 is raised, stopped, or lowered.

That is, as shown in FIG. 6, when the valve shaft 3 is at the left end a, the hoist cylinder 8 descends due to its own weight as shown by the arrow (the pump 71 is stopped at this time as described later). The hydraulic oil flows from the lower chamber 81 of the hoist cylinder 8 into the upper chamber 82 of the hoist cylinder via the flow passages 97, 93, 94, 95 and 98 as shown by the arrow (the flow passage 96 is being blocked by the check valve 72). ). When the valve shaft 3 reaches the intermediate position b, the flow path 93 is closed and the piston 83 stops (the pump 71 is also stopped at this stage as described later).

When the valve shaft 3 reaches the right end c, the flow path 94 is cut off, while the pump 71 starts to operate as described later. The check valve 72 is unlocked by the hydraulic pressure of the pump 71, and the hydraulic oil circulates. Therefore, the piston 83 is pushed up and the hoist cylinder 8 rises.

When the valve shaft 3 is returned from the right end c to the intermediate position b, the pump 71 is in operation, but the hydraulic oil only circulates through the flow passages 91, 94, 95, 92, and the cylinder Doesn't work on da. When the valve shaft comes to the left end, the state returns to the illustrated state, the pump 71 stops, and the hoist cylinder 8 descends by its own weight as described above. In FIG. 6, 64 is a drive gear, 73 is an oil pump gear, 84 is a piston rod, and gears for transmitting the driving force of the 78, 79 motors.

As shown in FIG. 7, the power transmission mechanism of the PTO 1 includes an idler gear 62 connected to a transmission counter gear 76 (FIG. 6), an output gear 11 releasably arranged with the idler gear 62, and It has a shift fork 2 for engaging and disengaging the output gear 11 with the idler gear 62. Further, it has a valve shaft 3 for linearly reciprocating the shift fork 2, a feed screw 4 and a drive motor 77. The idler gear 62 is pivotally attached to the PTO case 61 by a pin 63.

Further, as shown in FIGS. 7 and 8, the valve shaft 3 has a small diameter portion 31 and a large diameter portion 32, and the small diameter portion 31 is inserted into the shift fork 2. The left end of the valve shaft 3 is fitted into the right end 41 of the feed screw 4 and fixed by a connecting pin 42.

Further, key grooves 391 and 392 are provided between the insertion hole 21 of the shift fork 2 and the small diameter portion 31 of the valve shaft 3, and the key 39 is driven therein. The shift fork 2 has a pair of left and right claws 22 and 23 at the bottom, and the claws 22 and 23 are fitted into the grooves 12 of the output gear 11, respectively.

On the other hand, the feed screw 4 is engaged with a female screw formed inside the gear 79. The gear 79 meshes with the pinion gear 78 of the drive motor 77. The drive motor 77 is fixed to the actuator case 611, and the actuator case 611 is fixed to the PTO case 61.

The power transmission mechanism of the PTO operates as follows. The rotational force of the drive motor 77 is transmitted to the feed screw 4 by the pinion gear 78 and the gear 79. The feed screw 4 is fixed to the valve shaft 3, but the valve shaft 3 is prevented from rotating by the shift fork 2 which engages the groove 12 of the output gear 11 at the lower side. Therefore, the feed screw 4 fixed to the valve shaft 3 is also restrained from rotating, and linearly moves corresponding to the rotational movement of the gear 79. The linear movement changes the direction corresponding to the forward and reverse rotations of the drive motor 79, so that the valve shaft 3 reciprocates.

The valve shaft 3 is inserted into the shift fork 2 and slides with respect to the shift fork in a certain section, but is integrated after the flange surface 411 of the feed screw 4 contacts the left side surface 25 of the shift fork. Then, the shift fork 2 is moved to the right.

On the other hand, when the valve shaft 3 moves from the right end to the left, it slides to the left with respect to the shift fork 2 for a certain period, and then the left end face 321 moves the shift fork 2 to the left. .. Thus, the shift fork 2 performs a reciprocating motion with a rest section corresponding to the reciprocating motion of the valve shaft 3.

On the other hand, the output gear 11 performs a left-right linear movement integrated with the shift fork 2. As described above, when the output gear 11 moves to the right in FIG. 7 by the valve shaft 3, the gear 13 meshes with the gear 621 of the idler gear 62, and the rotational force of the idler gear 62 is transmitted to the output gear 11. And transmitted to the drive gear 64 fitted with the spline. As a result, the oil pump 71 is driven.

When the valve shaft 3 moves from the right end to the left, the valve shaft 3 slides in the shift fork 2 and does not move the shift fork 2, so the oil pump continues to operate. When the left end face 321 of the valve shaft 3 is further moved to the left to move the shift fork 2 to the left, the output gear 11 and the idler gear 62 are disengaged and the oil pump is stopped.

[0016]

[Problems to be solved]

 By the way, in the process of assembling the PTO, it is necessary to assemble the shift fork 2 and the valve shaft 3 in the PTO case, and further attach the feed screw 4. In this case, the valve shaft 3 is inserted into the insertion hole 21 of the shift fork 2 as described above.

On the other hand, a key 39 that connects the valve shaft 3 and the shift fork 2 is provided between the valve shaft 3 and the shift fork 2. Assembling the shift fork 2 and the valve shaft 3 into the PTO case includes (a) fitting the claws 22 and 23 of the shift fork 2 into the groove 12 of the output gear, and (b) inserting the valve into the shift fork insertion hole 21. (3) Insert the shaft 3, (c) Align the shift fork with the key grooves 391, 392 of the valve shaft, and insert the key 39 into the key grooves 391, 392. (D) Insert the right end 41 of the feed screw 4 into the valve shaft. 3 is fitted to the left end portion and fixed with the connecting pin 42.

In this case, the work (c) of driving the key is a work of driving the key by accurately aligning the key groove of the shift fork with the key groove of the valve shaft. The key and keyway are manufactured with high precision so that both are firmly fixed. Therefore, it is a difficult task that requires skill to perform key groove positioning and key driving work reliably and efficiently in a limited work space. The present invention is intended to provide a power transmission mechanism of a PTO that can facilitate the assembly work in the PTO case.

[0019]

[Means for solving the problem]

 A first aspect of the present invention includes an idler gear connected to an engine, an output gear that is disengageably attached to the idler gear, a shift fork for disengaging the output gear from the idler gear, and the shift fork. A power take-off power transmission mechanism comprising a valve shaft that linearly reciprocates and a feed screw that is arranged between the valve shaft and a drive motor to reciprocate the valve shaft. Is slidably inserted into the shift fork and has an abutting portion for abutting against the shift fork. A guide plate is fixed to the upper surface of the valve shaft, and the guide plate is attached to the shift fork. The power transmission mechanism of the power take-off is characterized in that the guide plate is slidably in surface contact with the upper surface and the guide plate is fixed to the feed screw. is there.

In the first invention, the feed screw, the valve shaft and the shift fork are configured as follows. The valve shaft has a small diameter part on the feed screw side (left side in Fig. 1), a large diameter part with a larger diameter on the valve side (right side in Fig. 1), and is formed in the middle by the difference in diameter. It has an abutting part (the left end surface of the large diameter part). The small diameter portion of the valve shaft is slidably inserted into the insertion hole of the shift fork, but the large diameter portion has a larger diameter than the insertion hole.

On the other hand, a guide plate is fixed to the upper surface of the valve shaft. When the valve shaft is inserted through the insertion hole of the shift fork, the lower surface of the guide plate and the upper surface of the shift fork form a contact surface so that they are in surface contact with each other. The contact surface is formed so as to prevent the valve shaft from rotating in the insertion hole of the shift fork. That is, when the valve shaft rotates, the contact surface of the guide plate, which is about to rotate together with the valve shaft, contacts the contact surface of the shift fork and has a shape that inhibits the rotation of the valve shaft. It is not particularly limited to a plane.

On the other hand, the contact surface is formed as a surface parallel to the axial direction so as not to prevent the valve shaft from sliding axially in the insertion hole of the shift fork. The guide plate is also fixed to the feed screw. That is, the guide screw connects the lead screw and the valve shaft. The other PTO power transmission mechanisms are the same as in the conventional example.

A second aspect of the present invention is an idler gear connected to an engine, an output gear arranged to be disengageable from the idler gear, a shift fork for disengaging the output gear from the idler gear, and a shift fork. A power take-off power transmission mechanism including a valve shaft that linearly reciprocates a shift fork, and a feed screw that is arranged between the valve shaft and a drive motor and that reciprocates the valve shaft. The valve shaft is slidably inserted into the shift fork, and the shift fork has a cylindrical portion arranged on the outer periphery of the valve shaft, and the cylindrical portion has a guide groove along the valve shaft. And a fixing member for fixing the feed screw and the valve shaft, which is disposed in the guide groove of the shift fork. In the power transmission mechanism of the power take-off, characterized in that there.

In the second invention, the feed screw, the valve shaft, and the shift fork are configured as follows. The valve shaft has a small diameter part on the feed screw side, a large diameter part with a larger shape on the valve side, and an abutting part (the left end surface of the large diameter part) formed by the diameter difference in the middle. Form. On the other hand, the cylinder part of the shift fork has the same axis as the valve shaft, and has an inner diameter that allows the small diameter part of the valve shaft to be inserted. The inner diameter of the cylinder is smaller than the outer diameter of the large diameter part of the valve shaft.

The valve shaft and the feed screw are fixed by a fixing member such as a bolt. Also, the head of the fixing member is projected from the fixing hole of the valve shaft. In addition, a guide groove is formed in the cylindrical portion of the shift fork parallel to the axial direction. The groove width of the guide groove is formed to be slightly wider than the head portion of the fixing member. Moreover, the head of the fixing member is placed in the groove of the guide groove. Others are the same as those of the first invention.

[0026]

[Action and effect]

 The function and effect of the first device will be described. As described above, the valve shaft is inserted into the shift fork, and the guide plate on the upper surface of the valve shaft is in surface contact with the upper surface of the shift fork. Since the contact surface is parallel to the axial direction, the valve shaft can slide in the axial direction. On the other hand, in the rotational movement around the valve shaft center, the contact surface of the guide plate abuts the contact surface of the shift fork and rotation is suppressed.

Therefore, the rotational force acting on the feed screw causes the feed screw and the valve shaft to rotate linearly without rotating the valve shaft and reciprocates the valve shaft. The other operations of the PTO power transmission mechanism are similar to those of the conventional example.

On the other hand, the work of assembling the shift fork and the valve shaft by the present device to the PTO case is performed as follows. (A) Fit the shift fork claw into the output gear groove, (b) Insert the valve shaft into the shift fork insertion hole, and (c) Guide the guide plate and the shift fork while aligning the contact surfaces. Fix the plate to the valve shaft, and (d) fix the feed screw to the guide plate. Here, in comparison with the work of the conventional apparatus, the work of the above (c ') and (d') is different from the conventional work process.

Further, the step (c) is a work for fixing the guide plate and the valve shaft with, for example, bolts while aligning the contact surfaces of the guide plate and the shift fork, which requires no skill and is extremely common work. Is. Also, the work (d) is extremely easy. Therefore, according to the present invention, it is possible to provide a PTO power transmission mechanism in which the assembling work in the PTO case is much easier than in the past.

Next, the function and effect of the second invention will be described. A head portion of a fixing member for fixing the feed screw is projected on the valve shaft, and the head portion is arranged in a guide groove of the cylindrical portion of the shift fork. Since the guide groove is formed in parallel with the axis of the valve shaft, the head portion does not hinder the movement of the valve shaft in the axial direction. Therefore, the valve shaft can be slid in the axial direction through the through hole of the shift fork. On the other hand, since the fixing member comes into contact with the edge of the guide groove, rotational movement of the valve shaft is suppressed. Therefore, the rotational force acting on the feed screw causes linear movement without rotating the feed screw and valve shaft. The other operations of the PTO power transmission mechanism are similar to those of the conventional example.

On the other hand, the work of assembling the shift fork and the valve shaft to the PTO case is performed as follows. (A) Fitting the claws of the shift fork into the groove of the output gear, (b ') Inserting the valve shaft into the tubular part of the shift fork, (c) Shifting the holes for fixing the valve shaft and the feed screw. Insert the fixing member in alignment with the guide groove of the fork and fix the valve shaft and the feed screw.

Here, the assembling work in the conventional device and the above (a) and (b ') of the present invention are almost the same, and the work of (c) and (d) and the above (c ") of the conventional device are the same. The work described in (c) above consists of aligning the positions of the mounting holes of the fixing members and inserting the fixing members, and is a mundane task that does not require skill, and is extremely easy compared to conventional methods. Therefore, according to the second aspect of the present invention, it is possible to provide a PTO power transmission mechanism in which the work of assembling the valve shaft in the PTO case is easy.

[0033]

【Example】

 Embodiment 1 An embodiment of the first invention will be described with reference to FIGS. 1, 2 and 7. The power transmission mechanism of the PTO of this example is the same as that of the conventional example except the structure of the feed screw, the valve shaft, and the shift fork, and the PTO power transmission mechanism other than the above parts is shown in FIG. 1 shows the feed screw 4, the valve shaft 3 and the shift fork 2 of this example in an extracted manner, and FIG. 2 is a sectional view taken along the line AA of FIG. ..

That is, the power transmission mechanism of the PTO according to the present embodiment disengages the idler gear 62 connected to the engine, the output gear 11 disengageable from the idler gear 62, and the output gear 11 from the idler gear 62. And a valve shaft 3 for linearly reciprocating the shift fork 2. Further, it has a feed screw 4 which is arranged between the valve shaft 3 and the drive motor 77 and reciprocates the valve shaft 3.

The valve shaft 3 is slidably inserted into the shift fork 2 and has an abutting portion 321 for abutting the shift fork 2. A guide plate 45 is fixed to the upper surface of the valve shaft 3. is there. The guide plate 45 is in slidable surface contact with the upper surface of the shift fork 2 (FIG. 2), and is fixed to the feed screw 4. The valve shaft 3 has a small diameter portion 31 and a large diameter portion 32, and the small diameter portion 31 is inserted into the insertion hole 21 of the shift fork 2 (FIG. 2). The contact portion 321 at the left end of the large diameter portion 32 of the valve shaft 3 contacts the right side surface of the shift fork 2 and 26 (FIG. 1) when the valve shaft 3 moves leftward.

On the other hand, a guide plate 45 is fixed to the upper surface of the valve shaft 3 by a connecting bolt 421. The guide plate 45 has a connecting plate 46 extending in the axial direction and an end face plate 47 perpendicular to the axial center. The connecting plate 46 has flat contact surfaces 461 and 462 on its lower surface, and is in surface contact with the upper flat surfaces 241 and 242 of the shift fork 2.

On the other hand, the guide plate 45 is integrally attached to the feed screw 4. The guide plate 45 determines the length of the connecting plate 46 and the position of the connecting bolt hole so that the end face plate 47 of the guide plate 45 contacts the left end portion 33 of the valve shaft 3 when attached to the valve shaft 3. The diameter of the end plate 47 of the guide plate 45 is larger than the diameter of the small diameter portion 31 of the valve shaft 3, and has a flange portion 471 on the peripheral edge. As shown in FIG. 2, the shift fork 2 has pawls 22 and 23 and is fitted in the groove 12 of the output gear 11. The other output gear 11, idler gear 62, drive gear 64, etc. are the same as in the conventional example shown in FIG.

Next, the function and effect of this example will be described. As described above, the feed screw 4 receives the rotational force of the drive motor 77 and tries to rotate. Therefore, the connecting plate 46 of the guide plate 45 makes surface contact with the upper flat surfaces 241 and 242 of the shift fork 2 at the contact surfaces 461 and 462, and gives the shift fork 2 a rotational force about the valve shaft. However, the shift fork 2 cannot rotate because the pawls 22 and 23 are fitted in the groove 12 of the output gear 11. Therefore, the rotation of the guide plate 45 is suppressed.

Therefore, similarly to the conventional example, the feed screw 4 makes a linear motion along the axis. Therefore, the valve shaft 3 integrated with the feed screw 4 reciprocates in the axial direction corresponding to the forward and reverse rotation of the drive motor 77. When the valve shaft 3 moves to the left, after sliding in the insertion hole 21 of the shift fork 2, the contact portion 321 of the large diameter portion 32 contacts the right side surface 26 of the shift fork 2 and after contact. Moves shift fork 2 to the left.

When the valve shaft 3 moves to the right, similarly, after sliding in the insertion hole 21 of the shift fork 2, the flange portion 471 of the end face plate 47 of the guide plate 45 has the left side surface 25 of the shift fork 2. And the shift fork 2 is moved to the right. As described above, the feed screw 4, the valve shaft 3, and the shift fork 2 of this example reciprocate as in the conventional example. The other parts of the power transmission mechanism of the PTO operate similarly to the conventional example.

On the other hand, the work of assembling the feed screw 4, the shift fork 2 and the valve shaft 3 in the PTO case in this example is performed as follows. (A) Fitting the claws 22 and 23 of the shift fork 2 into the groove 12 of the output gear 11, (b) Inserting the valve shaft 3 into the through hole 21 of the shift fork 2, (c ') Valve shaft 3 With the screw hole of the connecting bolt 421 of the above as the upper surface, the contact surfaces 461 and 462 of the guide plate 45 and the upper flat surfaces 241 and 242 of the shift fork 2 are joined, and the connecting plate 46 of the guide plate 45 is connected by the connecting bolt 421. Fix on the valve shaft 3.

The above steps (a) and (b) are the same as those in the conventional example, and the step (c ′) is different from the operations (c) and (d) in the conventional example. The above steps (a), (b), and (c ') are common work steps that do not require special skill compared with the conventional work methods (b), (b), (c), and (d). Yes, the work is extremely easy.

Others are the same as the conventional example. Therefore, according to this example, it is possible to provide a PTO power transmission mechanism that facilitates the work of assembling the shift fork and the valve shaft, etc. to the PTO case and that has the same power transmission effect as the conventional example.

Embodiment 2 An embodiment of the second invention will be described with reference to FIGS. 3 to 5. In this embodiment, the feed screw 4, the valve shaft 3, and the shift fork 2 are changed from those in the first embodiment. As shown in FIGS. 3 to 5, the valve shaft 3 of the present example is slidably inserted into the shift fork 2, and the shift fork 2 is a tubular portion 27 arranged on the outer periphery of the valve shaft 3. The tubular portion 27 has a guide groove 28 along the valve shaft 3. On the other hand, between the feed screw 4 and the valve shaft 3, there is a fixing bolt 44 as a fixing member for fixing the two, and the fixing bolt is arranged in the guide groove 28.

The valve shaft 3 has a small diameter portion 31 and a large diameter portion 32, and the small diameter portion 31 is inserted into the tubular portion 27 of the shift fork 2. The small diameter portion 31 of the valve shaft 3 has a shaft hole 38 at the left end for inserting the feed screw 4. Further, an end shaft portion 48 is formed on the right side of the feed screw and is fitted into the shaft hole 38 on the left side of the valve shaft 3, and the feed screw 4 and the valve shaft 3 are fixed by the fixing bolt 44. There is.

The head portion 441 of the fixing bolt 44 that fixes the feed screw 4 and the valve shaft 3 is located above the valve shaft 3. The head 441 of the fixing bolt 44 is arranged in the guide groove 28 of the tubular portion 27. The end shaft portion 48 of the feed screw 4 is provided with a flange portion 49 having a diameter larger than that of the small diameter portion of the valve shaft 3. The shift fork 2 has pawls 22 and 23 and is fitted in the groove 12 of the output gear 11. In addition, the output gear 11, the idler gear 62, the drive gear 64, etc. are the same as in the conventional example shown in FIG.

Next, the function and effect of this example will be described. As described above, the feed screw 4 and the valve shaft 3 fixed to the feed screw try to rotate by receiving the rotational force of the drive motor 77. Therefore, the head portion 441 of the fixing bolt 44 comes into contact with the edge of the guide groove 28 of the cylinder portion 27 of the shift fork 2 and tries to rotate the shift fork 2.

However, since the claws 22 and 23 of the shift fork 2 are fitted in the groove 12 of the output gear 11, the rotation of the shift fork 2 around the axis of the valve shaft 3 is suppressed. .. Therefore, the feed screw 4 is restrained from rotating, and therefore moves linearly in the axial direction. Therefore, the feed screw 4 and the valve shaft 3 reciprocate in the axial direction corresponding to the forward / reverse rotation of the drive motor 77.

When the valve shaft 3 moves from the right end to the left, the small diameter portion 31 of the valve shaft 3 slides in the guide groove 28 of the shift fork 2. After that, the contact portion 321 at the left end of the large diameter portion 32 of the valve shaft 3 contacts the right end surface 271 of the tubular portion 27 and moves the shift fork 2 to the left. On the other hand, when the valve shaft 3 moves from the left end to the right, the small diameter portion 31 similarly slides in the tubular portion 27 of the shift fork 2. Then, the flange 49 of the end shaft portion 48 of the feed screw 4 contacts the left side surface 25 of the shift fork 2 to move the shift fork 2 to the right. In this way, the feed screw 4, valve shaft 3, and shift fork 2 of this example also reciprocate as in the conventional example. The other parts of the power transmission mechanism of the PTO operate in the same manner as the conventional example.

On the other hand, the work of assembling the shift fork 2 and the valve shaft 3 in the PTO case in this example is carried out as follows. (A) Fitting the claws 22 and 23 of the shift fork 2 into the guide groove 12 of the output gear 11, (b ') inserting the valve shaft 3 into the tubular portion 27 of the shift fork 2, and (c') feeding Insert the end shaft portion 48 of the screw 4 into the shaft hole 38 of the valve shaft 3, and align the screw holes of the fixing bolt 44 of the valve shaft 3 small diameter portion 31 and the end shaft portion 48 with the guide groove 28 of the shift fork 2 and fix the fixing bolt. Tighten 44.

When the steps (a), (b ′) and (c ′) are compared with the conventional method (b), (b), (c) and (d), the work method according to this example is exceptional. This is a common work method that does not require the skill of, and the work is extremely easy. Others are the same as those in the first embodiment. Therefore, according to this example, it is possible to provide a PTO power transmission mechanism that facilitates the work of assembling the shift fork and the valve shaft and the like.

[Brief description of drawings]

FIG. 1 is a sectional view of a PTO power transmission mechanism according to a first embodiment around a valve shaft.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view around the valve shaft in the power transmission mechanism of the PTO according to the second embodiment.

FIG. 4 is a plan view of a valve shaft and a guide groove portion according to the second embodiment.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is an overall explanatory diagram of power take-off.

FIG. 7 is a cross-sectional view of a conventional power take-off power transmission mechanism.

8 is a sectional view taken along the line DD of FIG.

[Explanation of symbols]

 1. ． ． PTO (Power Take Off), 11. ． ． Output gear, 12. ． ． Groove of output gear, 2. ． ． Shift fork, 22, 23. ． ． Nail, 27. ． ． Tubular part, 28. ． ． Guide groove, 3. ． ． Valve shaft, 31. ． ． Valve shaft small diameter part, 32. ． ． Valve shaft large diameter portion, 45. ． ． Guide plate, 4. ． ． Lead screw, 44. ． ． Fixing bolt,

Claims (2)

[Scope of utility model registration request] 1. An idler gear connected to an engine, an output gear arranged to be disengageable from the idler gear, a shift fork for engaging and disengaging the output gear with the idler gear, and a linear reciprocating motion of the shift fork. A power take-off power transmission mechanism having a feed screw for reciprocating the valve shaft, the valve shaft sliding on the shift fork. The guide plate is fixed to the upper surface of the valve shaft, and the guide plate is slidable on the upper surface of the shift fork. The power transmission mechanism of the power take-off, which is in contact with the guide plate and is fixed to the feed screw. 2. An idler gear connected to an engine, an output gear disengageable from the idler gear, a shift fork for engaging and disengaging the output gear with the idler gear, and a linear reciprocating motion of the shift fork. In a power take-off power transmission mechanism including a valve shaft for driving the valve shaft and a drive screw arranged between the valve shaft and a drive motor to reciprocate the valve shaft, the valve shaft slides on the shift fork. The shift fork has a tubular portion arranged on the outer periphery of the valve shaft, the tubular portion having a guide groove extending along the valve shaft, and the shift fork having the guide screw extending along the valve shaft. There is a fixing member for fixing both of them, and the fixing member is arranged in the guide groove of the shift fork. Off of the power transmission mechanism.