JP2019015311A - Supporting structure of park rod - Google Patents

Abstract

To suppress rattling of a park rod 4 supported by a rod plate 3.SOLUTION: A supporting structure 1 of a park rod 4 in a parking mechanism 10 has a manual shaft 2 which rotates with the operation of a select lever; a rod plate 3 which integrally rotates with the manual shaft 2; and a park rod 4 in which a coupling portion 45 on one end side in a longitudinal direction is supported in a through-hole 35 provided on the rod plate 3 so as to rotate about an axis X2 parallel with the a rotary axis X1 of the manual shaft 2. The other end side of the park rod 4 is configured so as to move forward/backward with the rotations of the manual shaft 2. A coupling portion 45 penetrates the through-hole 35 from one side to the other side in the axis X2 direction, and on an outer periphery of an area projecting out from the through-hole 35 to the one side and the other side in the coupling portion 45, a stop ring is detachably provided, thereby regulating displacement in the axis X2 direction of the coupling portion 45 with the stop ring.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a support structure for a park rod.

  A vehicular automatic transmission is provided with a parking mechanism for restricting rotation of an output shaft when a vehicle equipped with the automatic transmission is parked (for example, Patent Document 1).

JP-A-11-082736

FIG. 4 is a diagram for explaining a support structure for a park rod according to a conventional example.
(A) of FIG. 4 is a figure explaining the whole structure of a parking mechanism.
FIG. 4B is a diagram illustrating a state where the connecting portion is supported by the P range.
(C) of FIG. 4 is a figure explaining the state by which the connection part was supported by ranges other than P range.
FIG. 4D is an enlarged view of the AA cross section in FIG.
Note that the periphery of the connecting portion 45 in FIGS. 4B and 4C is schematically shown as a cross section of the periphery of the connecting portion 45 in FIG.

  As shown in FIG. 4A, the parking mechanism 10 includes a manual shaft 2 that rotates about the central axis X1 in conjunction with an operation of a select lever (not shown), and a rod plate 3 that rotates integrally with the manual shaft 2. The connecting portion 45 on the one end 42 side in the longitudinal direction supports the park rod 4 supported by the rod plate 3, the parking pole 7 operated by the park rod 4, and the other end 41 side in the longitudinal direction of the park rod 4. And a support actuator 8.

The connecting portion 45 of the park rod 4 is formed by bending one end 42 side in the longitudinal direction, and the connecting portion 45 of the park rod 4 in the rod plate 3 rotates at a position offset radially outward from the central axis X1. Supported as possible.
When the manual shaft 2 rotates about the center axis X1, the park rod 4 rotates around the axis X2 parallel to the center axis X1 while the connecting portion 45 rotates around the center axis X1 (in the figure, arrows A or B). The other end 41 side in the longitudinal direction moves forward and backward in a direction orthogonal to the central axis X1 (in the direction of arrow C or D in the figure).

  A cam 6 for driving the parking pole 7 is provided on the other end 41 side of the park rod 4. When the parking pole 7 is driven by the cam 6, the locking claw 71 of the parking pole 7 is engaged with the parking gear 90 provided on the output shaft 9, and the rotation of the output shaft 9 is restricted.

The connecting portion 45 of the park rod 4 is rotatably supported by a through hole 35 provided in the rod plate 3, and the connecting portion 45 has a coining portion for preventing the connecting portion 45 from falling off the through hole 35. 450 is provided.
The coining portion 450 is provided on each of the one side and the other side across the through-hole 35, and when the connecting portion 45 moves in the penetration direction of the through-hole 35, the coining portion 450 becomes a through-hole in the rod plate 3. By coming into contact with the peripheral portion 351 of the 35, the drop-off of the connecting portion 45 from the through hole 35 is prevented.

Specifically, in the P range, the cam 6 is disposed at a position inserted into the parking pole 7 and the support actuator 8. In this state, the other coining portion 450 (the lower side in the figure) sandwiching the through-hole 35 abuts on the peripheral portion 351 of the through-hole 35 (see FIG. 4B).
On the other hand, in ranges other than the P range, the cam 6 is disposed at a position separated from the parking pole 7 and the support actuator 8. In this state, the coining portion 450 on one side (upper side in the drawing) sandwiching the through hole 35 abuts on the peripheral portion 351 of the through hole 35 (see FIG. 4C).
Thereby, the drop-off from the through hole 35 of the connecting portion 45 is prevented.

  For this reason, the connecting portion 45 is rattled between the coining portions 450 provided on one side and the other side in the through direction of the through hole 35. This backlash changes the performance of the parking mechanism 10.

  Moreover, the notch part 350 is provided in the peripheral part 351 of the through-hole 35 in the rod plate 3 (refer (d) of FIG. 4). The connecting portion 45 can be inserted into the through hole 35 by matching the angular positions of the notch portion 350 and the coining portion 450 around the axis X2 of the through hole 35.

However, when the parking mechanism 10 is operated, if the angular positions of the notch 350 and the coining 450 around the axis X <b> 2 coincide with each other, the connecting part 45 falls out of the through hole 35.
Therefore, the range in which the notch 350 can be provided in the peripheral edge 351 of the through hole 35 is limited, and the shape of the rod plate 3 is limited.

  Therefore, it is required to improve the degree of freedom of the shape of the rod plate 3 while suppressing backlash of the park rod 4 supported by the rod plate 3.

The present invention
A manual shaft that rotates in conjunction with the operation of the select lever,
A rod plate that rotates integrally with the manual shaft;
A connecting portion on one end side in the longitudinal direction has a park rod supported through a through hole provided in the rod plate so as to be rotatable about an axis parallel to the rotation axis of the manual shaft,
The other end side of the park rod is a support structure of the park rod in the parking mechanism configured to move forward and backward in conjunction with the rotation of the manual shaft,
The connecting portion penetrates the through hole from one side to the other side in the axial direction, and a retaining ring is provided on an outer periphery of a region protruding from the through hole in the connecting portion to the one side and the other side. Is detachable.
A park rod support structure in a parking mechanism, wherein the retaining ring restricts displacement of the connecting portion in the axial direction.

  According to the present invention, rattling of the park rod supported by the rod plate can be suppressed. Further, since it is not necessary to provide a coining portion in order to suppress rattling of the park rod, the degree of freedom of the shape of the rod plate is improved.

It is a figure explaining the support structure of a park rod. It is a figure explaining a snap ring. It is a figure explaining a retaining ring. It is a figure explaining the support structure of the park rod concerning a prior art example.

  Hereinafter, an embodiment of the present invention will be described taking an automatic transmission employing the support structure 1 of the park rod 4 as an example.

FIG. 1 is a view for explaining a support structure 1 for a park rod 4.
FIG. 1A is a diagram illustrating the overall configuration of the parking mechanism 10.
FIG. 1B is a diagram schematically showing a cross section obtained by cutting the periphery of the connecting portion 45 in FIG.
FIG. 1C is a diagram for explaining a modification of the snap ring 5.
FIG. 1D is a view for explaining a modification of the snap ring 5 and the ring groove 43.
In FIGS. 1C and 1D, a portion corresponding to the cross section of the surface N in FIG.

  As shown in FIG. 1 (a), a vehicular automatic transmission is provided with a parking mechanism 10 for restricting the rotation of the output shaft 9 when a vehicle equipped with the automatic transmission is parked. .

  In the support structure 1 of the park rod 4 according to the embodiment, the connecting portion 45 is rotatably supported by the through hole 35 of the rod plate 3 and is axially connected to the rod plate 3 by the snap ring 5 described later. It is supported so that it cannot move relative to the X2 direction.

As shown in FIG. 1B, the connecting portion 45 has an outer diameter r that substantially matches the diameter of the through hole 35 of the rod plate 3. A ring groove 43 is formed on the outer peripheral surface of the connecting portion 45 over the entire circumference in the circumferential direction around the axis X2.
The ring grooves 43 are provided in regions protruding from the through hole 35 in the connecting portion 45 to one side and the other side, respectively.

Snap rings 5 and 5 are fitted into these ring grooves 43 and 43, respectively (see FIG. 1B).
The ring groove 43 according to the embodiment is a round groove (see FIGS. 1B and 1C), but may be a V groove 43A (see FIG. 1D).

[Snap ring 5]
FIG. 2 is a diagram illustrating the snap ring 5.
FIG. 2A is a view for explaining the AA cross section in FIG.
FIG. 2B illustrates the snap ring 5 after deformation.
In the following description, the snap ring 5 located on one side (the upper side in FIG. 1B) of the through hole 35 in the connecting portion 45 will be described as an example.

  As shown to (a) of FIG. 2, the snap ring 5 is an annular member which has the joint 50 in one place of the circumferential direction. The snap ring 5 has an inner diameter r1 smaller than the outer diameter r of the park rod 4 and an outer diameter R1 larger than the outer diameter r of the park rod 4 (r1 <r <R1).

  As shown in FIG. 1B, the snap ring 5 has a rectangular shape in cross-sectional view. In the snap ring 5, one surface 5a and the other surface 5b in the direction of the axis X2 are flat surfaces orthogonal to the axis X2.

  As shown in FIG. 1B, the snap ring 5 is disposed across the ring groove 43 and the peripheral edge portion 351 of the through hole 35 in the radial direction of the axis X2. One surface 5a of the snap ring 5 is in contact with the ring groove 43 on the inner peripheral side, and is in contact with the peripheral edge portion 351 of the through hole 35 on the outer peripheral side. The one surface 5a abuts on the ring groove 43 and the peripheral edge portion 351 of the through hole 35 over substantially the entire circumference in the circumferential direction around the axis X2.

  The snap ring 5 according to the embodiment has a rectangular shape in cross-sectional view (see FIG. 1B). However, the snap ring 5A having a circular shape in cross-sectional view (see FIGS. 1C and 1D). ).

  Here, as shown in FIG. 2B, the snap ring 5 can be elastically deformed in a direction in which the circumferential width of the joint 50 is increased.

The snap ring 5 is disposed in the ring groove 43 in the following procedure.
(A) The snap ring 5 is deformed until the inner diameter r2 is larger than the outer diameter r of the park rod 3 by applying a stress in the direction of expanding the circumferential width of the joint 50 to the snap ring 5 (r <r2). .
(B) The snap ring 5 having an enlarged inner diameter is disposed in the ring groove 43.
(C) By releasing the stress applied to the snap ring 5, the snap ring 5 has an inner diameter r1 smaller than the outer diameter r of the park rod 4 by the elimination of deformation (r1 <r).
Thereby, the snap ring 5 is arranged in the ring groove 43.

  The snap ring 5 is disposed at two locations of ring grooves 43 and 43 located on one side and the other side of the through hole 35, respectively. The snap rings 5 and 5 are provided in contact with the ring groove 43 and the peripheral portion 351 of the through hole 35 on one side and the other side of the through hole 35, respectively.

  Thereby, it can suppress that the connection part 45 rattles between the snap rings 5 and 5, and the performance of the parking mechanism 10 is stabilized. The snap rings 5 and 5 can be easily disposed in the ring grooves 43 and 43.

The above-described method for arranging the snap ring 5 in the ring groove 43 is an example. The snap ring 5 may be disposed in the ring groove 43 by other methods.
For example, after the snap ring 5 is extrapolated from the axial direction (downward in FIG. 1B) to the connecting portion 45, the outer periphery of the connecting portion 45 is slid until the snap ring 5 reaches the ring groove 43. You may make it move.
In this case, since it is not necessary to greatly deform the snap ring 5 in the direction in which the joint 50 is widened, the snap ring 5 can be arranged in the ring groove 43 more smoothly.
Since the snap ring 5 has high rigidity, the snap ring 5 is inserted into the connecting portion 45 like a ring from the axial direction and disposed in the ring groove 43 as compared with the case where the snap ring 5 is deformed in the direction in which the joint 50 is widened. The arrangement of the snap ring 5 with respect to the ring groove 43 is easier.

As described above, in the embodiment,
(1) a manual shaft 2 that rotates in conjunction with the operation of the select lever;
A rod plate 3 that rotates together with the manual shaft 2;
A connecting rod 45 on one end side in the longitudinal direction is supported by a through-hole 35 provided in the rod plate 3 so as to be rotatable about an axis X2 parallel to the rotation axis X1 of the manual shaft 2. Have
The other end side of the park rod 4 is a support structure 1 for the park rod 4 in the parking mechanism 10 configured to move forward and backward in conjunction with the rotation of the manual shaft 2,
The connecting portion 45 penetrates the through hole 35 from one side to the other side in the direction of the axis X2, and around the axis X2 around the outer periphery of the region protruding from the through hole 35 in the connecting portion 45 to the one side and the other side. A snap ring 5 (retaining ring) having a joint 50 at one place in the circumferential direction is detachably provided,
The snap ring 5 is configured to restrict the displacement of the connecting portion 45 in the direction of the axis X2.

  If comprised in this way, the rattling of the park rod 4 supported by the rod plate 3 can be suppressed with the snap ring 5 of a simple structure. Moreover, since it is not necessary to provide the coining part 450 and the notch part 350, the freedom degree of the shape of the rod plate 3 improves.

(2) The snap ring 5 is configured to be fitted around the ring groove 43 provided on the outer periphery of the connecting portion 45.

If comprised in this way, since the position shift of the snap ring 5 in the connection part 45 can be prevented suitably, the rattling of the park rod 4 supported by the rod plate 3 can be suppressed reliably.
Further, the formation of the ring groove 43 is easier than the formation of the coining part and the notch part, and the manufacturing cost can be suppressed.

[Retaining ring 5B]
In the above-described embodiment, the case where the backlash of the park rod 4 supported by the rod plate 3 is suppressed by the snap ring 5 engaged with the ring groove 43 is illustrated, but the present invention is limited only to this aspect. is not.
For example, instead of the snap ring 5, a retaining ring 5 </ b> B may be externally fitted in the ring groove 43.

FIG. 3 is a diagram for explaining a support structure 1A for the park rod 4 according to a modification.
FIG. 3A shows a configuration in which a snap ring 5B is externally fitted to the ring groove 43 in place of the snap ring 5 in FIG.
FIG. 3B is a view for explaining deformation of the retaining ring 5B.
(C) of FIG. 3 is a schematic diagram of a BB cross section of (a) of FIG.
In the following description, the retaining ring 5B located on one side (the upper side in FIG. 3C) of the through hole 35 in the connecting portion 45 will be described as an example.

  As shown in FIG. 3A, the retaining ring 5B is a resin-made annular member. The retaining ring 5B has an inner diameter r1 smaller than the outer diameter r of the park rod 4 and an outer diameter R1 larger than the outer diameter r of the park rod 4 (r1 <r <R1).

  As shown in FIG. 3C, the retaining ring 5B has a rectangular shape in cross-sectional view. In the retaining ring 5B, one surface 50a and the other surface 50b in the direction of the axis X2 are flat surfaces orthogonal to the axis X2.

  The retaining ring 5B is disposed across the ring groove 43 and the peripheral edge portion 351 of the through hole 35 in the radial direction of the axis X2. One surface 50a of the retaining ring 5B contacts the ring groove 43 on the inner peripheral side, and contacts the peripheral edge portion 351 of the through hole 35 on the outer peripheral side. The one surface 50a contacts the ring groove 43 and the peripheral edge portion 351 of the through hole 35 over the entire circumference in the circumferential direction around the axis X2.

As shown in FIGS. 3A and 3B, the retaining ring 5 </ b> B is composed of a pair of arcuate members 55 and 56. The arcuate member 55 has a fitting hole 556 at one end 550 in the circumferential direction around the axis X 2 and a projection 555 at the other end 551. The arc-shaped member 56 has a fitting hole 566 at one end 561 in the circumferential direction around the axis X2 and a protrusion 565 at the other end 560.
The arc-shaped members 55 and 56 are connected by an elastically deformable connecting piece 57 that connects the outer periphery of the arc-shaped member 55 on the other end 551 side and the outer periphery of the arc-shaped member 56 on the one end 561 side.

  The retaining ring 5 </ b> B fits the projection 555 of the arcuate member 55 into the fitting hole 566 of the arcuate member 56 and fits the projection 565 of the arcuate member 56 into the fitting hole 556 of the arcuate member 55. It is like that.

Arrangement of the retaining ring 5B in the ring groove 43 is performed in the following procedure.
(A) The arc-shaped members 55 and 56 are connected to each other only by the connection piece 57 (the state where the protrusions 555 and 565 are not fitted in the fitting holes 566 and 556).
(B) The inner circumferences of the arc-shaped members 55 and 56 are made to run along the ring groove 43.
(C) The protrusions 555 and 565 are fitted into the fitting holes 566 and 556, respectively.
Thereby, the retaining ring 5 </ b> B is disposed in the ring groove 43.

  The retaining rings 5B are disposed at two locations of ring grooves 43 and 43 located on one side and the other side of the through hole 35, respectively. These retaining rings 5B and 5B are provided in contact with the ring groove 43 and the peripheral portion 351 of the through hole 35 on one side and the other side of the through hole 35, respectively.

  Therefore, it is possible to prevent the connecting portion 45 from rattling in the direction of the axis X2 between the retaining rings 5B and 5B arranged on one side and the other side across the through hole 35 in the direction of the axis X2. Further, the retaining ring 5B can be easily disposed in the ring groove 43.

  As described above, the retaining ring 5B (arc-shaped members 55 and 56) is made of resin. Therefore, even if the stress in the direction of the axis X2 acts on the retaining ring 5B from the connecting portion 45 or the rod plate 3, the stress can be absorbed by the retaining ring 5B.

(3) The retaining ring 5B (retaining ring) is composed of a pair of arcuate members 55 and 56, and
One end 550 and the other end 551 of one arcuate member 55 of the pair of arcuate members 55 and 56 are connected to the other end 560 and one end 561 of the other arcuate member 56 in the circumferential direction, It is formed in an annular shape,
The arc-shaped members 55 and 56 have fitting holes 556 and 566 at circumferential ends 550 and 561, respectively, and protrusions 555 and 565 at other ends 551 and 560, respectively.
The arcuate members 55, 56 fit the projections 555 of the arcuate member 55 into the fitting holes 566 of the arcuate member 56 and fit the projections 565 of the arcuate member 56 into the fitting holes 556 of the arcuate member 55. Connected together,
The arc-shaped members 55 and 56 are connected by elastically deformable connection pieces 57 that connect the outer circumference of the arc-shaped member 55 on the other end 551 side and the outer circumference of the arc-shaped member 56 on the one end 561 side.

With this configuration, the projection 555 of the arcuate member 55 is fitted into the fitting hole 566 of the arcuate member 56, and the projection 565 of the arcuate member 56 is fitted into the fitting hole 556 of the arcuate member 55. Thus, the arc-shaped member 55 and the arc-shaped member 56 can be assembled. Therefore, the work of assembling the retaining ring 5B to the connecting portion 45 can be easily performed.
Further, since the arc-shaped member 55 and the arc-shaped member 56 are connected by the connection piece 57, it is possible to suitably prevent the arc-shaped member 55 or the arc-shaped member 56 from being lost during the assembling work.

  Further, rattling of the park rod 4 supported by the rod plate 3 can be suppressed by the retaining ring 5B having a simple configuration. Moreover, since it is not necessary to provide the coining part 450 and the notch part 350, the freedom degree of the shape of the rod plate 3 improves.

DESCRIPTION OF SYMBOLS 1 Support structure 2 Manual shaft 3 Rod plate 4 Park rod 5 Snap ring 5B Retaining ring 6 Cam 7 Parking pole 8 Support actuator 9 Output shaft 10 Parking mechanism 35 Through-hole 43 Ring groove 45 Connection part 50 Joint 55 Arc-shaped member 56 Arc shape Member 57 Connection piece 71 Locking claw 90 Parking gear 351 Peripheral part 555 Protrusion 556 Fitting hole 565 Protrusion 566 Fitting hole X1 axis X2 axis

Claims (4)

A manual shaft that rotates in conjunction with the operation of the select lever,
A rod plate that rotates integrally with the manual shaft;
A connecting portion on one end side in the longitudinal direction has a park rod supported through a through hole provided in the rod plate so as to be rotatable about an axis parallel to the rotation axis of the manual shaft,
The other end side of the park rod is a support structure of the park rod in the parking mechanism configured to move forward and backward in conjunction with the rotation of the manual shaft,
The connecting portion penetrates the through hole from one side to the other side in the axial direction, and a retaining ring is provided on an outer periphery of a region protruding from the through hole in the connecting portion to the one side and the other side. Is detachable.
A park rod support structure in a parking mechanism, wherein the retaining ring restricts displacement of the connecting portion in the axial direction.   2. The support structure for a park rod in a parking mechanism according to claim 1, wherein the retaining ring is provided by being fitted into a groove provided on an outer periphery of the connecting portion.   The support structure for a park rod in a parking mechanism according to claim 1 or 2, wherein the retaining ring is a snap ring having a joint at one circumferential position around the axis. The retaining ring is composed of a pair of arcuate members, and one end and the other end of one arcuate member of the pair of arcuate members are connected to the other end and one end of the other arcuate member. Is,
The arc-shaped member has a protrusion and a fitting hole into which the protrusion is fitted, respectively, at one end and the other end in the circumferential direction.
The pair of arcuate members are connected by an elastically deformable connecting piece that connects the outer circumference on the one end side of one arcuate member and the outer circumference on the other end side of the other arcuate member. The support structure of the park rod in the parking mechanism according to claim 1 or 2.

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