JP2016040481A - Detent spring attachment structure for parking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten an assembling time of a transmission to a rear case by using a detent spring being a constituent of a parking lock mechanism and an opening part at a case side for positioning.SOLUTION: A parking device of a transmission comprises: a rotating shaft in a transmission case; a parking gear fixed to the rotating shaft; a parking pole engaged with the parking gear at its tip; a detent plate; a detent spring which abuts on a recessed cam part of the detent plate; and a retainer at a wall face of a rear case. The detent plate is arranged at an opposite side of the retainer with respect to the wall face, the detent spring is attached to a retainer back face side, and the detent spring penetrates an opening part opened at the wall face of the rear case, and abuts on a recessed cam part of the detent plate at a side at which the detent plate is located at its tip.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a parking lock mechanism that regulates rotation of a rotation shaft of a transmission.

Conventionally, in a transmission having a parking lock mechanism, a parking gear is fixed to a rotation shaft of the transmission, and a parking pole is provided on a parking pole shaft pivotally supported on a rear case of the transmission. The extended tip is pivotally supported so that the rotating shaft can be switched to be rotatable or non-rotatable by meshing with or disengaging the parking gear.
A detent plate that rotates in conjunction with the driver's shift lever operation is provided, a concave cam portion is provided on the outer peripheral surface of the detent plate, and the detent plate is positioned in the rotational direction by contacting the concave cam portion. It is known that a detent spring is provided, and a retainer for pivotally supporting the parking pole shaft of the parking pole is attached to the wall surface of the rear case of the transmission.

JP 2002-250440 A

By the way, in the conventional parking detent spring mounting structure, as disclosed in Patent Document 1, a parking lock mechanism for a transmission that is positioned by a detent spring formed by a detent plate and a leaf spring is provided, A wall portion of the transmission case that is abutted and fixed with a screw hole for fixing the detent spring is provided, and the detent spring is fixed to the wall portion of the transmission case opposite to the detent plate.
Therefore, since the retainer and the detent spring are not unitized when the retainer that supports the parking pole is assembled, the detent spring cannot be easily positioned and attached to the wall portion of the transmission case.
As a result, it takes time to align the retainer with respect to the wall surface of the transmission case, and there is a disadvantage that it takes time to assemble the retainer.

  An object of the present invention is to shorten the assembly time of the retainer that supports the parking pole by using the opening formed in the wall surface on the case side for positioning the detent spring.

  Therefore, in order to eliminate the inconvenience described above, the present invention is rotatably supported by a rotating shaft disposed in the transmission case, a parking gear fixed to the rotating shaft, and a parking pole shaft. A parking pole whose tip extends from the parking pole shaft meshes with or disengages from the parking gear, and the rotation shaft can be switched to be rotatable or non-rotatable, and is rotated in conjunction with the driver's shift lever operation. The detent plate, and a detent spring for positioning in the rotational direction of the detent plate, and the parking pole shaft of the parking pole can be rotated by contacting the detent plate and a concave cam portion provided on the outer peripheral surface of the detent plate. Attached to the wall of the rear case of the transmission The detent plate is provided on the opposite side of the retainer with respect to the wall surface, and the detent spring is attached to the rear side of the retainer. Extends through the opening opened in the wall of the rear case to the side where the detent plate is located, and the tip of the concave cam portion provided in the detent plate is in contact with the detent plate. To do.

According to the present invention, the detent plate is provided on the side opposite to the retainer with respect to the wall surface of the rear case, the detent spring is attached to the rear side of the retainer, and the detent spring is opened to the wall surface of the rear case. Is extended to the side where the detent plate is located, and its tip is brought into contact with a concave cam portion provided on the detent plate.
Therefore, since the detent spring can be assembled to the rear case of the transmission in a state where it is assembled to the retainer, the assembling property can be improved.
Further, by inserting the detent spring into the opening when the retainer is assembled, the detent spring is positioned when the retainer is assembled, which can contribute to shortening the assembling time.

FIG. 1 is a central longitudinal sectional view of a transmission case of the transmission. (Example) FIG. 2 is a schematic view of the rear case of the transmission as viewed from the transfer case side. (Example) 3 is a schematic cross-sectional perspective view taken along line III-III in FIG. (Example) FIG. 4 is a schematic view of a parking gear, a parking pole, a detent plate, and a detent spring as components of the parking lock mechanism as viewed from the left side of the vehicle. (Example) FIG. 5 is a perspective view showing a parking gear, a parking pole, a detent plate, and a detent spring, which are components of the parking lock mechanism, as viewed from the lower left front. (Example)

  Embodiments of the present invention will be described below in detail with reference to the drawings.

1 to 5 show an embodiment of the present invention.
In FIG. 1, reference numeral 1 denotes a transmission mounted in a vertically installed state, for example, when the state of the driving force transmission path when mounted on a vehicle (not shown) is an FR type (front engine / rear drive).
Reference numeral 2 denotes a transmission case of the transmission 1.
The transmission case 2 is divided into, for example, three parts. The front case 3 is located on the engine side (not shown) on the front side of the vehicle, the rear case 4 is connected to the rear side of the front case 3, and the rear case 4 is connected to the rear side of the vehicle. And a transfer case 5 connected to the side.

In the transmission case 2, an input shaft 6 to which driving force from the engine is input, a counter shaft 7 that is arranged in parallel with the input shaft 6 and transmits driving force from the input shaft 6, The rotary shaft 8 is an output shaft that is coaxial with the input shaft 6 and arranged rearward, that is, on the rear side of the vehicle.
That is, the driving force from the engine is input from the input shaft 5 and is shifted to a predetermined speed ratio between the input shaft 6 and the counter shaft 7 parallel to the input shaft 6, and then via an output gear 11 described later. Is transmitted to the rotary shaft 8 which is an output shaft.

The transmission 1 is provided with a parking lock mechanism 9.
The parking lock mechanism 9 functions to lock the wheels when the shift lever is operated to the parking range by the driver's shift lever operation.
A parking gear 10 that is a component of the parking lock mechanism 9 is fixed to the rotating shaft 8.
The parking gear 10 is disposed on the vehicle front side of the output gear 11.
For this reason, the parking gear 10, together with the rotating shaft 8 and the parking pole 12, is disposed in a space that appears between the rear case 4 and the transfer case 5.
First, the configuration of the parking lock mechanism 9 will be described.
The parking lock mechanism 9 includes a parking gear 10 fixed to the rotary shaft 8 of the transmission 1, a parking pole shaft 19 that is pivotally supported by the rear case 4 of the transmission 1, and a base end portion that rotates to the parking pole shaft 19. The front end portion 12a that is pivotally supported and extends obliquely upward from the parking pole shaft 19 engages with or disengages from the parking gear 10 so that the rotating shaft 8 can be switched to be rotatable or non-rotatable. A parking pole 12, a manual shaft 20 that is formed by a plate-like member and rotates in conjunction with the driver's shift lever operation, and a detent plate 13 that is attached so as to be coaxial with the rotation center of the manual shaft 20. Detent plate formed by plate-like member 3, a detent spring 14 that performs positioning in the rotational direction of the detent plate 13 by abutting against a concave cam portion 22 provided on the outer peripheral surface of the detent plate 3, and a retainer that is attached to the rear case 4 while rotatably supporting the parking pole 12. 15, a parking rod 16 that moves forward and backward (moves in the axial direction) in conjunction with the rotation of the link plate 21, a cam portion 17 that contacts the curved contact surface portion of the parking pole 12, and the outer periphery of the parking rod 16 And a cam spring 18 fitted on the surface.

The wall surface 23 of the rear case 4 is formed with a recess 29 that opens toward the rear side of the vehicle.
When the concave portion 29 is viewed from the rear side of the vehicle, a detent spring-side opening for the quadrangular detent spring 14 that allows the detent spring 14 to pass through the lower portion of the concave portion 29 so as to face the rear surface of the retainer 15. A portion 26 is formed.
The detent spring side opening 26 for the detent spring 14 is formed at substantially the same height as the lower end of the parking gear 10 (see FIG. 2).
A parking rod side opening 30 for the parking rod 16 that can penetrate the parking rod 16 below the detent spring side opening 26 for the detent spring 14 is provided around the output shaft 8 and through the output shaft side. It is formed on the lower left side of the hole 31.
In addition, an oil communication hole 32 through which the oil stored in the transmission case 2 can flow is provided as another opening at the bottom of the wall surface 23 of the rear case 4 around the output shaft 8 and for the parking rod 16. The parking rod side opening 30 is formed obliquely below and to the right.

In the parking lock mechanism 9, the detent spring 14, the retainer 15, and the parking lock guide (also referred to as “support”) 28 are unitized, and various parts are integrated to achieve a compact size.
A retainer 15, which is a base member that is a part of the unit configuration and to which other parts are attached, supports the parking pole 12 so as to be rotatable and is attached to a wall surface 23 of the rear case 4 of the transmission 1 on the rear side of the vehicle. It is done.
In addition, the retainer 15 is formed in an arc shape, and both ends of the retainer 15 are attached to the rear case 4 by a first fastening bolt 24 to which the upper first point is attached and a second fastening bolt 25 to which the lower second point is attached. Fastened with two-point support.
More specifically, the retainer 15 is arranged so as to sandwich the detent spring side opening 26 for the detent spring 14, the parking rod side opening 30 for the parking rod 16, and the oil communication hole 32 in the circumferential direction of the output shaft 8. The two fastening bosses provided as above are fastened to the first fastening boss 33 on the upper side and the second fastening boss 34 on the lower side by the first fastening bolt 24 and the second fastening bolt 25, and to the wall surface 23 of the rear case 4. It is attached.
As a result, the retainer 15 is disposed so as to cover the detent spring side opening 26 for the detent spring 14, the parking rod side opening 30 for the parking rod 16, and the oil communication hole 32 from the rear. .
Further, one end of the retainer 15 is fastened by a first fastening bolt 24 to a first fastening boss 33 disposed on the left side of the parking gear 10. The other end portion of the retainer 15 is fastened by a second fastening bolt 25 to a second fastening boss 34 disposed below the parking gear 10.
The retainer 15 is formed with a protruding portion 35 that protrudes toward the front of the vehicle so that the lower portion of the upper first fastening boss 33 enters the recess 29 when the openings 26 and 30 and the oil communication hole 32 are covered. Is done.
The lower surface of the projecting portion 35 is a mounting seat surface for the detent spring 14, and a fastening bolt hole (not shown) is formed in the vertical direction from the mounting seat surface.
The parking gear 10 and the parking pole 12 are disposed so as to be able to mesh with each other between the first fastening boss 33 and the lower second fastening boss 34 in the circumferential direction of the output shaft 8.
A fastening bolt 27 for fastening the detent spring 14 to the retainer 15 is provided on the back side of the retainer 15.
The detent spring 14 is attached to the lower surface of the projecting portion 35 by the fastening bolt 27 from below, and the rear end portion of the detent spring 14 on the retainer 15 side is attached in a state of being bent downward by 90 degrees on the back surface of the retainer 15.

The parking rod 16 that moves forward and backward (moves in the axial direction) in conjunction with the rotation of the detent plate 13 is linked to the link plate 21 to which the rotating operation of the manual shaft 20 is transmitted with respect to the rotational axis direction of the parking pole 12. Are arranged in parallel.
The parking rod 16 is allowed to move back and forth in the axial direction by transmitting the rotation of the manual shaft 20 via the link mechanism of the link plate 21.
The vehicle rear side end of the parking rod 16 passes through the parking rod side opening 30 for the parking rod 16, and a rod insertion groove (not shown) of the parking rod guide (also referred to as "support") 28 and The retainer 15 is disposed through a rod insertion hole (not shown).
The cam portion 17 is formed in a truncated cone shape having a large diameter portion and a tapered small diameter portion.
The parking rod 16 having the cam portion 17 attached to the rear end portion of the vehicle is in contact with the rod insertion groove of the parking rod guide 28 and the rod insertion hole of the retainer 15 in order from the tapered small diameter portion of the cam portion 17 to the large diameter portion. It is attached as follows.
The cam spring 18 is disposed on the outer peripheral portion of the parking rod 16 so as to urge the parking gear 10 in the direction of disengagement of the tip 12a of the parking pole 12.
The parking pole shaft 19 of the parking pole 12 is pivotally supported by being sandwiched between the wall surface 23 of the rear case 4 of the transmission 1 and the retainer 15.

The detent plate 13 is provided on the vehicle front side with respect to the wall surface 23 of the rear case 4.
The detent spring 14 has a base end on the rear side of the vehicle fastened to the retainer 15, while an end portion on the front side of the vehicle passes through a recess 29 formed on the front side of the vehicle with respect to the wall surface 23 of the rear case 4. It extends through the detent spring side opening 26 opened at the lower part of the back and extends to the side where the detent plate 13 is located, and the tip end portion 14 a is brought into contact with the concave cam portion 22 provided on the detent plate 13. Yes.
More specifically, the distal end portion 14a of the detent spring 14 passes through the opening 26 opened in the wall surface 19 of the rear case 4 from the transfer case 5 side, and the detent plate is located in the rear case 4 and on the vehicle front side. It extends while tilting downward on the side with 13.
The distal end portion 14 a of the detent spring 14 is brought into contact with the concave cam portion 22 of the detent plate 13.
At this time, the distal end portion 14a of the detent spring 14 is pressed against the concave cam portion 22 of the detent plate 13 by the spring force of the detent spring 14, thereby positioning the detent plate 13 in the rotational direction.

The fastening bolt 27 is provided with its axis perpendicular to the central axis of the parking pole shaft 19 of the parking pole 12.
The detent spring 14 is attached to the retainer 15 so that the center axis C1 of the fastening bolt 27 is in the vertical direction.
The parking pole 12 is rotatably supported by the parking pole shaft 19.
At this time, the rotation center line C2 of the parking pole shaft 19 is parallel to the rotating shaft 8 of the transmission 1 extending in the vehicle front-rear direction.
For this reason, the central axis C1 and the rotation center line C2 are in a direction perpendicular to the rotation center line C2.

Further, the fastening bolt 27 and the parking pole 12 are arranged so that at least a part thereof overlaps in the vehicle front-rear direction.
The parking pole 12 is disposed below the fastening bolt 27.

  Next, the operation of the parking lock mechanism 9 will be described.

  Normally, when the parking lock mechanism 9 is not functioning and is not locked, the tip end portion 12a of the parking pole 12 is not engaged with the parking gear 10.

When the driver performs a shift lever operation in order to make the parking lock mechanism 9 function, the manual shaft 20 rotates in conjunction with the driver's shift lever operation, and the rotation operation of the manual shaft 20 is the link plate. 21 is transmitted to the parking rod 16 through the link mechanism 21, and the parking rod 16 moves back and forth in the axial direction against the urging force of the cam spring 18, so that the cam provided at the end of the parking rod 16 The portion 17 also moves in the axial direction integrally with the parking rod 16, and the cam portion 17 moves in the axial direction, so that the contact position of the cam portion 17 with the parking pole 12 changes from a tapered small diameter portion to a large diameter portion. The large diameter portion of the cam portion 17 presses the parking pole 12, and the tip of the parking pole 12 Part 12a rotates the parking pawl 12 as the pivot center of the parking pawl shaft 19 so as to approach the parking gear 10 side.
The leading end 12 a of the parking pole 12 meshes with the parking gear 10.

Further, when the driver performs the shift lever operation in the reverse direction to the meshing operation in order to cancel the function of the parking lock mechanism 9, the manual shaft 20 is interlocked with the shift lever operation in the reverse direction of the driver. Is rotated in the reverse direction, and the rotation of the manual shaft 20 in the reverse direction is transmitted to the parking rod 16 via the link mechanism of the link plate 21, and the parking rod 16 is pivoted by the biasing force of the cam spring 18. By moving forward and backward in the direction, the cam portion 17 provided at the end of the parking rod 16 also moves in the axial direction integrally with the parking rod 16, and when the cam portion 17 moves in the axial direction, The contact position with the parking pole 12 is shifted from the large diameter portion to the tapered small diameter portion, and the small diameter portion of the cam portion 17 is Contacting the Nguporu 12, it is rotated as the pivot center of the parking pawl shaft 19 so that the tip portion 12a of the parking pawl 12 is separated from the parking gear 10 side parking pole 12 in the opposite direction.
At this time, the front end 12a of the parking pole 12 rotates to the side away from the parking gear 10, so that the engagement between the front end 12a of the parking pole 12 and the parking gear 10 is released.

Thereby, the state in which the detent spring 14 is assembled to the retainer 15, that is, the detent spring 14 and the retainer 15 which are components of the parking lock mechanism 9 can be unitized and assembled to the rear case 4 of the transmission 1. Therefore, the assembling property can be improved.
Further, when the retainer 15 is assembled, the detent spring 14 is inserted into the opening 26 and the tip portion 14 a of the detent spring 14 is brought into contact with the concave cam portion 22 of the detent plate 13. Therefore, the retainer 15 is positioned at the time of assembly, which can contribute to shortening the assembly time.

  Further, a fastening bolt 27 for fastening the parking pole 12 and the detent spring 14 to the retainer 15 is provided on the back side of the retainer 15, and the fastening bolt 27 has a shaft perpendicular to the parking pole shaft 19 of the parking pole 12. Since the center axis C1 of the fastening bolt 27 is provided in a direction perpendicular to the rotation center line C2 of the parking pole shaft 19 of the parking pole 12, the detent spring 14 fastened by the fastening bolt 27 is provided. However, the detent spring 14 is substantially linear.

Further, since the fastening bolt 27 and the parking pole 12 are arranged so that at least a part thereof overlaps in the vehicle front-rear direction, the fastening bolt of the parking pole 12 and the detent spring 14 on the rear surface of the retainer 15. 27. At least a part of the detent spring 14 is overlapped in the vehicle front-rear direction, etc., so that the detent spring 14 is secured even in a small space between the rear surface of the retainer 15 and the wall surface of the rear case 4. By doing so, the detent spring 14 can be arranged efficiently.
For this reason, the space can be effectively used and the space can be saved, and the transmission can be reduced in size.

DESCRIPTION OF SYMBOLS 1 Transmission 2 Transmission case 3 Front case 4 Rear case 5 Transfer case 6 Input shaft 7 Counter shaft 8 Rotating shaft 9 Parking lock mechanism 10 Parking gear 11 Output gear 12 Parking pole 12a Tip 13 Detent plate 14 Detent spring 14a Tip 15 Retainer 16 Parking rod 17 Cam portion 18 Cam spring 19 Parking pole shaft 20 Manual shaft 21 Link plate 22 Concave cam portion 23 Wall surface 24 First fastening bolt 25 Second fastening bolt 26 Detent spring side opening portion 27 Fastening bolt C1 Center axis of fastening bolt C2 Rotation center line of parking pole shaft

Claims (2)

  A rotating shaft disposed in the transmission case, a parking gear fixed to the rotating shaft, and a pivoting shaft rotatably supported by the parking pole shaft, the tip portion extending from the parking pole shaft meshes with the parking gear. Alternatively, a parking pawl that can switch the rotation shaft to be rotatable or non-rotatable by releasing the engagement, a detent plate that rotates in conjunction with the driver's shift lever operation, and an outer peripheral surface of the detent plate are provided. A detent spring for positioning the detent plate in the rotational direction by abutting against the concave cam portion, and a retainer that pivotally supports the parking pole shaft of the parking pole and is attached to the wall surface of the rear case of the transmission And a transmission with In the baking apparatus, the detent plate is provided on the side opposite to the retainer with respect to the wall surface, and the detent spring is attached to the rear side of the retainer, and the detent spring opens on the wall surface of the rear case. A parking detent spring mounting structure characterized in that it extends through the opening to the side where the detent plate is located, and the tip of the concave cam portion provided on the detent plate is brought into contact therewith.   A fastening bolt for fastening the parking pole and the detent spring to the retainer is provided on the rear side of the retainer, and the fastening bolt is provided with its axis in a direction perpendicular to the parking pole shaft of the parking pole, and 2. The parking detent spring mounting structure according to claim 1, wherein the fastening bolt and the parking pole are arranged so that at least a part thereof overlaps in the axial direction.

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