JPH10166880A - Parking device of automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent abnormal sound to be generated caused by the contact to a parking ball. SOLUTION: When a select lever is selected into the parking range during traveling of a vehicle, a parking rod 32 is moved to a parking ball 24 side, a wedge 30 fixed on one end of the parking rod tends to press the parking ball. However, a parking bear is rotated at high speed, and a claw part of the parking ball is not advanced to a parking gear. Accordingly, the wedge is moved together with the parking rod in such a direction as to be separated from the parking ball while compressing a coil spring. Therefore, the wedge and the parking rod are separated from the parking ball, no member for generating abnormal sound caused by the contact to the parking ball exist, and a sense of incongruity is not given to a driver.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a parking device for an automatic transmission.

[0002]

2. Description of the Related Art In FIG. 5, reference numeral 2 denotes an output shaft 2 of an automatic transmission. A parking gear 4 constituting a parking device is coaxially connected to the output shaft 2.

[0003] The parking device is a device for preventing rotation of the parking gear 4 when a select lever (not shown) is selected to a parking range, and includes a manual shaft 6 which is connected to the select lever and rotates around an axis S. ,
As shown in FIG. 6, a manual plate 8 fixed to the distal end of the manual shaft 6 and rotating around the axis S,
The rod plate 10 which is connected to the lower end of the manual plate 8 and rotates, the bent portion 12a formed on one end is fixed to the engaging portions 10a and 10b of the rod plate 10, and the wedge 14 is attached to the other end. Parking rod 1 arranged
5, a parking support 20 fixed to the mounting surface of the transmission case 16 by bolts 18 to support the wedge 14 from below,
A parking pawl 24 rotatably disposed on the transmission case 16 via the second gear 2 and having a claw 24a that enters between the teeth 4a of the parking gear 4; and a parking pawl 24 in a direction away from the parking gear 4. And a return spring 26 for biasing.

Here, as shown in FIG. 6, the above-described wedge 14 is formed in a substantially truncated cone shape and is slidably disposed in the axial direction of the parking rod 12. And
A coil spring 28 is disposed on the outer periphery of the parking rod 12 between the base end of the wedge 14 and the engaging portion 10a, and urges the wedge 14 toward the other end of the parking rod 12.

[0005] Then, the select lever is moved to PRND
When the user selects one of the six ranges of -2-1, the manual plate 8 and the manual plate 8
To the positions P, R, N, D, 2, 1 shown in FIG.

When the select lever is set to the "P (parking)" range when the vehicle stops, the manual plate 8 rotates to the position P as shown in FIG. 24
Move to the side. Then, the wedge 14 pushes up the parking pawl 24 while the lower surface thereof is supported by the parking support 20. When the claw portion 24a enters between the teeth 4a of the parking gear 4, the parking lock state is established.

When the select lever is set to the "D (drive)" range, the manual shaft 6 is moved.
At the same time, the manual plate 8 rotates to the position indicated by the symbol D, and the parking rod 12 also moves in a direction away from the parking pole 24 to release the pushing-up operation of the parking pole 24 by the wedge 14, so that the pawls 24a of the parking pole 24 When the gear 4 is separated from the teeth 4a, the parking free state is set.

[0008]

In the above-described parking apparatus, the parking gear 4 and the output shaft 2 of the automatic transmission operate at a high speed even if the select lever is erroneously selected to the "P" range during running of the vehicle. Before the pawls 24a of the parking pawl 24 bite between the predetermined teeth 4a of the parking gear 4, the teeth 4a of the next parking gear 4 prevent the pawls 24a from biting. The safety mechanism works so that it does not occur.

However, when the select lever is set to the "P" range during running of the vehicle as described above, the wedge 14 slides on the parking rod 12 and separates from the parking pole 24 as shown in FIG. However, the distal end portion 12b of the parking rod 12 passes between the parking support 20 and the parking pole 24 and further moves forward (to the left in FIG. 7).

[0010] At this time, the lower end of the parking pole 24 and the parking rod 12 come into contact with each other to generate abnormal noise, which may give a feeling of strangeness to a driver or the like. Therefore, the present invention has been made in view of the above-mentioned unsolved problems of the prior art, and has as its object to provide a parking device for an automatic transmission that can prevent abnormal noise caused by contact with a parking pole. I have.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, there is provided a parking gear rotating with an output shaft of an automatic transmission, and fixing the output shaft by engaging with the parking gear. A parking pole having a claw portion to be turned, a manual shaft that rotates according to the selection of a range of the select lever, and a manual shaft connected to the manual shaft via a link mechanism. When the select lever selects a parking range, the parking lever faces the parking pole. Move,
An automatic transmission having a parking rod separated from the parking pole when the select lever selects a traveling range, and a wedge provided on the parking rod and pressing the parking pole in a direction approaching the parking gear. In the parking device, the wedge is fixed to one end of the parking rod,
The other end of the parking rod is slidably connected to the link mechanism, and a coil spring for urging the wedge toward the parking pole is disposed on the outer periphery of the parking rod between the link mechanism and the wedge. The structure was established.

According to a second aspect of the present invention, in the parking device for an automatic transmission according to the first aspect, a manual plate that rotates the link mechanism with rotation of the manual shaft, and an outer edge portion of the manual plate And a rod plate rotatably connected to
A sliding connection portion is provided at the outer edge of the rod plate, and the other end of the parking rod is slidably connected to the sliding connection portion. The range is set within a range in which the manual plate and the rod plate rotate by selecting the range of the select lever.

[0013]

According to the parking device for an automatic transmission according to the first aspect, when the select lever is set to the parking range while the vehicle is running, the parking rod moves to the parking pole side and is fixed to one end of the parking rod. The wedge tries to press the parking pole. However, the parking gear rotates at high speed together with the output shaft of the automatic transmission, and the pawl of the parking pole does not enter the parking gear, so the wedge moves in the direction away from the parking pole with the parking rod while compressing and retracting the coil spring. I will do it.

As described above, the parking device of the present invention
Even if the select lever is set to the parking range while the vehicle is running, both the wedge and the parking rod move in a direction away from the parking pole. There is no member, and the driver does not feel uncomfortable.

According to the second aspect of the present invention, the effect of the parking device of the automatic transmission according to the first aspect can be obtained, and the other end of the parking rod connected to the sliding connection portion can be obtained. Since the moving area is set within the range in which the manual plate and the rod plate are rotated by the selection of the range of the select lever, it is not necessary to secure a space for the parking rod to move on the sliding connection side. Therefore, the degree of freedom in layout can be improved.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. The same components as those shown in FIGS. 5 to 7 are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, as shown in FIG. 1, a parking rod 32 is integrally fixed to a base end portion 30a of a substantially frustoconical wedge 30, and the parking rod 32 is slidably attached to a rod plate 34. While being connected,
The structure is such that a coil spring 36 is disposed on the outer periphery of the parking rod 12.

That is, the parking rod 32 is a member having an enlarged diameter portion 32b formed at one end of a rod main body 32a, and the other end of the rod main body 32a is coaxially fixed to a base end 30a of the wedge 30. .

The rod plate 34 is a plate member rotatably connected to the lower end portion of the manual plate 8 via a connecting bolt 38. The sliding connecting portion 34a is formed so that the wedge 30 is directed toward the parking pole 24 or the wedge 30 is separated from the parking pole 24.
Is slidably supported.

The coil spring 36 is disposed on the outer periphery of the parking rod 12 between the sliding connection portion 34a and the base end 30a of the wedge 30, and the coil spring 36
The wedge 30 is pressed against the parking pawl 24 when the urging force acts when the gap between the zero and the sliding connection portion 34a is close to each other.

In the parking device having the above structure, when the select lever is selected to the "P (parking)" range while the vehicle is stopped, as shown in FIG. The rod plate 34 connected to the manual plate 8 via the connection bolt 38 moves to the parking pole 24 side. As a result, the parking rod 32 engaged with the rod plate 34 also moves toward the parking pole 24, and the parking rod 3
The wedge 30 fixed to the other end of the second 2 rides on the parking support 20. And wedge 30
Pushes up the parking pole 24 while the lower surface is supported by the parking support 20. At this time, when the pawl 24a of the parking pole 24 collides with the tooth tip of the parking gear 4, the rod body 32a slides inside the sliding connection portion 34a and moves to the left in FIG. It is energized by 36 and enters a waiting state. When the vehicle slightly moves, the parking gear 4 rotates, and the pawl 24a of the parking pawl 24 corresponds between the teeth 4a of the parking gear 4, the waiting state of the wedge 30 is released. Of the parking gear 4 enters between the teeth 4a of the parking gear 4. As a result, a parking lock state is set.

When the select lever is set to the "D (drive)" range, as shown in FIG. 3, the manual plate 8 rotates together with the manual shaft 6 to the position of "D", and the rod plate 34 It moves in the direction to separate. At this time, since the enlarged diameter portion 32b abuts on the end face of the sliding connection portion 34a and the parking rod 32 also moves in a direction away from the parking pole 24, the wedge 30 cancels the operation of pushing up the parking pole 24. Since the parking pawl 24 is urged by the return spring 26 in a direction away from the parking gear 4, the pawl 24 a of the parking pawl 24 separates from the teeth 4 a of the parking gear 4, and is in a parking free state.

FIG. 4 shows the operation of the parking device when the select lever is selected to the "P (parking)" range while the vehicle is running. At this time, when the rod plate 34 moves to the parking pole 24 side, the parking rod 32 also moves to the parking pole 24 side, and the wedge 30 moves to the parking support 2.
Trying to get on 0. However, the parking gear 4 is rotating together with the output shaft 2 of the automatic transmission, and the pawls 24 of the parking pawl 24 are located between the parking gear teeth 4a.
Since a does not enter, the wedge 30 moves in the direction away from the parking pole 24 while pressing and contracting the coil spring 36.

At this time, the rod body 32a of the parking rod 32 slides inside the sliding connection portion 34a and moves to the left in FIG. The enlarged diameter portion 32b provided at one end of the rod body 32a is substantially the same as the position (the position shown in FIG. 1) when the select lever is selected to the "P (parking)" range when the vehicle stops. Move up to.

Therefore, according to the parking device having the above structure, the parking rod 32 is integrally fixed to the base end portion 30a of the wedge 30, and the parking rod 32 is slidably connected to the sliding connection portion 34a of the rod plate 34. Therefore, even if the select lever is set to the “P” range during traveling, both the wedge 30 and the parking rod 32 move in a direction away from the parking pole 24. For this reason, it is possible to prevent the generation of abnormal noise due to the contact between the parking pole 24 and the parking rod, which has occurred in the conventional device, and does not give a driver or the like a sense of discomfort.

Further, in the device of the present embodiment, the parking rod 30 slides inside the sliding connection portion 34a to
0, and moves in a direction away from the parking pole 24.
Returns to the position substantially the same as the position when the select lever was selected to the “D” range. Thereby, the parking rod 30 is placed in the transmission case 16 on the rod plate 34 side.
There is no need to provide a space for moving.

Therefore, the parking device according to the present embodiment can be disposed in the transmission case 16 without taking up space, so that the degree of freedom in layout can be improved.

The parking pole 24, wedge 3
Although the position and the direction of operation of each part have been described with respect to the 0, the parking rod 32 and the like in the up-down direction and the front-back direction, these indicate the relative position of each part or part. Of course, the absolute position and the direction of operation may be different from the above.

[Brief description of the drawings]

FIG. 1 is a diagram showing a state in which a select lever is selected to a parking range when a vehicle is stopped in a parking device for an automatic transmission according to the present invention.

FIG. 2 is a diagram showing a view taken along line II-II in FIG. 1;

FIG. 3 is a diagram showing a state in which a select lever is selected to a travel range in the present invention.

FIG. 4 is a view showing a state in which a select lever is selected to a parking range during traveling of the vehicle in the present invention.

FIG. 5 is a diagram showing a parking device disposed near an output shaft in a transmission case.

FIG. 6 shows a conventional automatic transmission parking device.
FIG. 5 is a diagram illustrating a state where a select lever is selected to a parking range when the vehicle stops.

FIG. 7 shows a conventional automatic transmission parking device.
FIG. 5 is a diagram illustrating a state in which a select lever is selected to a parking range during traveling of the vehicle.

[Explanation of symbols]

 2 output shaft 4 parking gear 4a parking gear teeth 6 manual shaft 8 manual plate 24 parking pole 24a pawl portion 30 wedge 32 parking rod 32a rod body 32b enlarged diameter portion 34 rod plate 34a sliding connection portion 36 coil spring

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshio Yamaguchi 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd.

Claims (2)

[Claims] 1. A parking gear that rotates with an output shaft of an automatic transmission, a parking pawl having a claw that engages with the parking gear and fixes the output shaft, and rotates according to a range selection of a select lever. The manual shaft is connected to the manual shaft via a link mechanism, and moves toward the parking pole when the select lever selects a parking range, and moves away from the parking pole when the select lever selects a travel range. A parking device for an automatic transmission, comprising: a rod; and a wedge disposed on the parking rod and pressing the parking pawl in a direction approaching the parking gear, wherein the wedge is fixed to one end of the parking rod. , Other than the parking rod And a coil spring that slidably connects the link mechanism to the link mechanism and that urges the wedge toward the parking pole on the outer periphery of the parking rod between the link mechanism and the wedge. A parking device for an automatic transmission. 2. The link mechanism comprises a manual plate that rotates with the rotation of the manual shaft, and a rod plate rotatably connected to an outer edge of the manual plate, and slides on an outer edge of the rod plate. A dynamic connecting part is provided, and the other end of the parking rod is slidably connected to the sliding connecting part, and an area in which the other end of the parking rod moves is selected by a range selection of the select lever. 2. The parking device for an automatic transmission according to claim 1, wherein the manual plate and the rod plate are set within a range in which the manual plate and the rod plate rotate.