JPH0428283Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a parking lock mechanism provided in an automatic transmission such as an automatic transmission automobile.

(Prior Art) In the parking lock mechanism, the guide plate for guiding the parking lock cam is conventionally attached to the case wall with a pair of bolts, and is positioned with respect to the case wall by the pair of bolts. It is being said.

(Problem to be solved by the invention) However, according to the above conventional example, the positioning of the guide plate is performed independently of the parking shaft that swingably supports the parking lock pole. It is difficult to accurately determine the position relative to the movement locus (determined by the position of the guide plate) and the swing locus of the parking lock pole (determined by the position of the parking shaft).

Therefore, due to the movement of the parking lock cam,
When the parking lock pole is swung, the swiveling position of the parking lock pole differs from the expected position, resulting in variations in the meshing distance between the parking lock pole and the parking gear.

(Means for Solving the Problems) In order to solve the above problems, the present invention has a parking shaft fixed to the case wall that swingably supports the parking lock pole, and a guide fixed to the case wall. In a parking lock mechanism for an automatic transmission, the parking lock mechanism of an automatic transmission is configured such that a parking lock cam is guided by a plate, and the parking lock pole in contact with the parking lock cam is removably engaged with a parking gear as the parking lock cam moves back and forth. The guide plate is positioned with respect to the case wall by fitting a hole provided in the guide plate into the parking shaft.

(Function) According to the above configuration, since the guide plate is positioned using the parking shaft, it becomes easy to accurately determine the relative position between the guide plate and the parking shaft.

Therefore, the relative position between the movement locus of the parking lock cam determined by the position of the guide plate and the swing locus of the parking lock pole determined by the position of the parking shaft becomes accurate.
It is possible to reduce variations in meshing distance between the parking lock pole and the parking gear.

Embodiment The illustrated embodiment of the present invention relates to a parking lock mechanism in an automatic transmission of an automatic transmission vehicle.

Fig. 1 shows the state when the selector lever of the automobile is set in the parking range, and the engaging protrusion 2 of the parking lock pole 1 meshes with the teeth of the parking gear 3, and the parking lock is performed. . The parking gear 3 is fixed to a shaft 4 disposed at a suitable position in a power transmission path of an automatic transmission.

As shown in FIG. 2, the parking lock pole 1 is swingably supported by a parking shaft 6 fixed to a case wall 5 of the automatic transmission. The large-diameter implanted portion 7 of the parking shaft 6 is fitted into a recess 8 provided in the case wall 5. On the other hand, a hole 10 formed at the base of the parking lock pole 1 is fitted into a pole support portion 9 on the small diameter side of the parking shaft 6.

The stepped surface of the stepped portion 11 formed between the planted portion 7 and the pole support portion 9 is substantially flush with the surface 5a of the case wall 5. And guide plate 1
The extension portion 13 of No. 2 is placed on the step portion 11, and the movement of the parking shaft 6 in the withdrawal direction is restrained. Note that 14 is a hole formed in the extension part 13, and is fitted into the pole support part 9 with almost no play.

A retaining ring 15 is fitted to the tip of the pawl support portion 9 of the parking shaft 6 to prevent the parking lock pole 1 from coming off. Further, a torsion spring 16, which biases the parking lock pawl 1 in the direction L in FIG. On the side of the parking lock pole 1, the other end 16
b are disposed so as to be latched to the side surfaces of the guide plate 12, respectively. The center portion 16c of the torsion spring 16 is fitted into the pole support portion 9 and is formed into a coil spring shape, so that when the parking lock pole 1 is pivotally supported on the pole support portion 9, the parking lock pole 1 and the guide plate are connected to each other. It is maintained in a compressed state between 12 and 12. Therefore, the central portion 16c of the torsion spring 16 acts as a compression coil spring, and elastically supports the parking lock pole 1 by contacting its back surface 1b, and also presses its surface 1a against the retaining ring 15, thereby locking the parking lock. The pole 1 will be held stably within its swing plane.

The guide plate 12 is fixed to the case wall 5 using two bolts 17 and 18. One bolt 17 is located far away from the parking shaft 6, and is fitted into a bolt insertion hole 19 provided in the guide plate 12 with almost no play. The other bolt 18 is located close to the parking shaft 6 and is located close to the guide plate 12.
A play is formed between the bolt insertion hole 20 and the bolt insertion hole 20 provided in the bolt insertion hole 20 . Therefore, the case wall 5 of the guide plate 12
The positioning with respect to the parking shaft 6
This is done by a bolt 17 located far away from this, and a bolt 18 located between these serves only to press and fix the guide plate 12 to the case wall 5.

A guide wall 21 whose cross-sectional shape is shown in FIG. 4 is bent and formed on one side edge of the guide plate 12. As shown in FIG. This guide wall 21 includes a cam guide portion 21a that stands up substantially at right angles to the case wall 5, and a cam holding portion 21b that bends from the end side of the cam guide portion 21 in a direction parallel to the case wall 5 (upward). have.

The cam guide portion 21a contacts the lower surface of the cam portion 22a of the parking lock cam 22 and functions to guide the parking lock cam 22, so that the parking lock cam 22 moves forward as shown in FIGS. 1 and 3. The cam portion 22a is bent so as to guide the cam portion 22a toward the parking gear 3 at this time.

The cam holding part 21b holds the cam part 22a between it and the case wall 5, as shown in FIG.
Its left and right movements are restricted. Also, the cam portion 22a
The downward movement of is restricted by the cam guide portion 21a.

Shaft portion 22b of the parking lock cam 22
has a hook portion 2 at its base end, as shown in Figure 2.
3 is formed. This hook portion 23 engages with an engagement hole 25 of a manual valve plate 24, so that rotation of the manual valve plate 24 is converted into forward and backward movement of the parking lock cam 22. Further, in order to prevent the hook portion 23 from coming off from the engagement hole 25 in the direction P in FIG.
An extension 26a of the valve body plate 26 is abutted against the top surface 23a of the hook 23. This valve body plate 26 is connected to the valve bodies 27, 2.
By extending the extension part 26a to a normal-shaped steel plate interposed between 8 and 8,
A function to prevent the hook portion 23 from being removed is added. The valve bodies 27 and 28 are attached to a support member such as the case wall 5 after the hook portion 23 is engaged with the engagement hole 25. Note that it is also possible to prevent the hook portion 23 from coming off by the valve body 28 itself. Further, 22c is a compression coil spring of the parking lock cam 22, 22d,
22c is a locking pin that is locked to the shaft portion 22d.

The manual valve plate 24 is attached to the case wall 5.
An operating rod 30 is hydraulically driven in the valve body 27 and is pivoted around a pivot shaft 29 supported by the valve body 27.
It is fixed at the tip of. Note that 31 is a positioning recess formed in the manual valve plate 24, and 32 is a positioning ball.

The forward and backward movement of the operating rod 30 is converted into the forward and backward movement of the parking lock cam 22 by the manual valve plate 24. The parking lock cam 22 is guided by the guide wall 21 of the guide plate 12 and moves back and forth between the unlocked state shown in FIG. 3 and the locked state shown in FIG. When the parking lock cam 22 moves forward, its cam portion 22a comes into contact with the cam contact surface 1c of the parking lock pole 1, as shown in FIG.
The engaging projection 2 is forcibly rotated in the direction shown in FIG. When the parking lock cam 22 is retracted, as shown in FIG.
The parking lock pawl 1 is rotated in the direction L in FIG. 3 by the restoring force of the torsion spring 16, and the engagement projection 2 is disengaged from the teeth of the parking gear 3.

(Effects of the invention) Since the present invention has the above-mentioned configuration and operation, the relative position between the guide plate and the parking shaft can be determined accurately, and as a result, the engagement between the parking lock pole and the parking gear can be made accurate. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the parking lock state of the embodiment of the present invention, Fig. 2 is a sectional view taken along the line - - in Fig. 1, Fig. 3 is a front view showing the parking lock release state, and Fig. 4 is a front view showing the parking lock state. FIG. 4 is a sectional view taken along the - line in FIG. 3; 1... Parking lock pole, 3... Parking gear, 5... Case wall, 6... Parking shaft, 12... Guide plate, 22... Parking lock cam.

Claims (1)

[Scope of utility model registration request] The parking lock pole is swingably supported by a parking shaft fixed to the case wall, and the parking lock cam is guided by a guide plate fixed to the case wall. In the parking lock mechanism of an automatic transmission configured to swing the parking lock pawl in contact with the parking gear so that the parking lock pawl is removably engaged with the parking gear, the positioning of the guide plate with respect to the case wall is controlled by the guide plate. A parking lock mechanism for an automatic transmission, characterized in that the parking lock mechanism is achieved by fitting a hole provided in the parking shaft into the parking shaft.