CN117722498A

CN117722498A - Parking lock device for a transmission with parking lock wheels

Info

Publication number: CN117722498A
Application number: CN202310984895.6A
Authority: CN
Inventors: 乌韦·施瓦兹; 尤利·施瓦布
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Holding China Co Ltd
Priority date: 2022-09-16
Filing date: 2023-08-07
Publication date: 2024-03-19
Also published as: DE102022123810A1

Abstract

The invention relates to a parking lock device (1) for a transmission of a motor vehicle, said transmission having parking lock wheels, said parking lock device comprising: a pawl (3) which is pivotably accommodated at the pin (4) and is designed to cooperate with the toothing of the parking lock wheel in order to lock the rotation of the parking lock wheel in the locked position and release the rotation of the parking lock wheel in the unlocked position, wherein a roller housing (5) is arranged between a first side wall (6 a) and a second side wall (6 b) of the parking lock device (1) and is linearly movable for actuating the pawl (3), wherein the roller housing (5) has at least one first roller (7 a) and one second roller (7 b) and a wall arrangement (8) for accommodating and supporting the two rollers (7 a,7 b), wherein the first roller (7 a) is arranged at the pawl (3) and the second roller (7 b) is arranged at a raceway wall (9) which is arranged opposite the pawl (3) between the first and second side walls (6 a,6 b), wherein a support plate (6 b) is arranged between the first and second side walls (6 a,6 b) and a support plate (10) is arranged between the roller housing (5) and the guide plate (5) when the pawl (3) is pivoted.

Description

Parking lock device for a transmission with parking lock wheels

Technical Field

The invention relates to a parking lock device for a transmission of a motor vehicle, wherein the transmission has parking lock wheels.

Background

The parking lock device is provided for engaging, in the event of actuation by the driver of the motor vehicle, by means of a pawl into a toothing of a parking lock wheel of the transmission, so that a rotation of a shaft of the transmission, which is operatively connected to the parking lock wheel, is blocked by said engagement of the pawl, thus preventing the motor vehicle from rolling away.

For example, DE 10 2019 101 913 B4 discloses a parking brake system for a transmission of a motor vehicle, which has parking brake wheels. The parking lock device comprises a pawl configured to co-act with a tooth of the parking lock wheel in order to lock the rotation of the parking lock wheel in the locked position and release the rotation of the parking lock wheel in the unlocked position. The pawl is steerable via a roller box and is pivotally accommodated at the peg about an axis of rotation. A guide rod and a spring element are arranged at the roller box. The roller box is operatively connected to the pawl and is axially movable in a longitudinal direction of the guide rod to manipulate the pawl.

Disclosure of Invention

The object of the invention is to further improve a parking lock device, in which, in particular, tilting and warping of the roller housing should be prevented. The object is achieved by the subject matter of claim 1. Preferred embodiments are found in the dependent claims.

The parking lock device for a transmission of a motor vehicle according to the invention comprises a pawl which is pivotably accommodated at a pin and is designed to cooperate with a toothing of a parking lock wheel of the transmission in order to lock rotation of the parking lock wheel in a locked position and release rotation of the parking lock wheel in an unlocked position, wherein a roller housing is arranged between a first side wall and a second side wall of the parking lock device and is linearly movable for actuating the pawl, wherein the roller housing has at least a first roller and a second roller and a wall arrangement for accommodating and supporting both rollers, wherein the first roller is arranged at the pawl, wherein the second roller is arranged at a raceway wall which is arranged opposite the pawl between the first and second side walls, wherein a support wall is arranged between the first and second side walls, wherein the roller housing is guided substantially rotationally locked between the raceway wall and the support plate upon actuating the pawl. In particular, the support plate is arranged parallel to the raceway wall and is likewise accommodated at both side walls as the raceway wall. Thus, the side walls carry the support plate and the raceway wall portions.

The pawl is provided for engagement in a tooth slot of the parking lock wheel in a locked position, wherein a roller box, also referred to as a slider assembly, manipulates the pawl between the locked position and the unlocked position. The roller box is spatially disposed between the first and second side walls, the support plate, and the raceway wall portion. Preferably, the roller box is switchable or otherwise linearly movable via the actuator. In particular, the roller box moves substantially perpendicular to the direction of movement of the pawl. Because the pawl performs a rotational movement, the roller box moves approximately parallel to the longitudinal extension of the pawl, in particular within a quadrangular body formed by two side walls, a raceway wall and a support plate.

The two rollers of the roller housing rest against one another, wherein the first roller is additionally supported on a bevel at the pawl, and wherein the second roller is additionally supported on the raceway wall. The bevel is at the opposite side of the pawl from the pawl tooth in the tooth slot engaged at the park lock wheel, i.e. on the back side of the pawl.

The raceway wall and the support plate guide the roller box as it moves linearly along the pawl so that the roller box can rotate or tilt as little as possible. The raceway wall part guides the roller box on a first side of the roller box facing away from the pawl, wherein the support plate guides the roller box on a second side of the roller box opposite thereto, i.e. on a side facing the rear side of the pawl. In this way, a torsion stop for the roller housing is achieved, which prevents the roller housing from tilting and buckling during the linear movement along the pawl during actuation and within the quadrangular body.

The two side walls of the parking lock are formed as wall elements and are arranged, in particular, parallel to the pawl, wherein the pawl is arranged at least partially between the two side walls. Preferably, the two side walls are formed from sheet metal and are spaced apart from one another by at least two sleeve elements provided for threading the screw. A screw is guided through the sleeve element and screwed into a threaded bore provided for this purpose at the housing in order to attach the parking lock device to the housing of the transmission.

The raceway wall portion and the support plate are preferably also composed of sheet metal and are arranged substantially perpendicularly to the side walls and accommodated at the side walls. For example, recesses are formed in the side walls for this purpose, which recesses at least partially accommodate the raceway wall and the support plate.

According to a preferred embodiment, the support plate has two guide legs and a base, wherein the base connects the two guide legs to one another, wherein the roller housing rests against the guide legs. In particular, the roller box slides at the guide legs while moving linearly along the pawls. In particular, the support plate is essentially U-shaped and has an opening between the two guide legs. The pawl extends at least partially spatially between the two guide legs. In particular, the two guide legs are formed substantially parallel to one another, wherein the base is formed substantially perpendicular to the two guide legs.

Preferably, the wall means of the roller box has two spaced apart support points for each guide leg. The support point is in this context understood to be an abutment surface or point of the wall arrangement of the roller box at the guide leg of the support plate. Thus, two support points are provided at the wall means of the roller box for the first guide leg and two support points are provided at the wall means of the roller box for the second guide leg. Preferably, the two support points on each side of the wall arrangement of the roller box are maximally spaced apart from each other. The inclination of the roller box can thereby be reduced.

Preferably, the wall means of the roller box are formed at least partially concavely between the two support points. In particular, further support points of the wall arrangement at the respective guide legs are thereby prevented. Thereby, the friction surface between the roller box and the support plate is minimized.

According to a preferred embodiment of the invention, the roller box has at least two spaced apart support points at the raceway wall. Preferably, at least one support point at the raceway wall is provided for a wall arrangement of the roller box, wherein at least one support point at the raceway wall is provided for a second roller of the roller box. The support and guidance of the roller box at the raceway wall is thus effected on the one hand via the support points at the wall means and on the other hand via the support points at the second rollers which roll at the raceway wall. Thereby, the friction surface between the roller box and the raceway wall portion is minimized.

According to a preferred embodiment of the invention, a spring element is provided at the roller housing at least partially spatially between the first and second side walls, the support plate and the raceway wall. In particular, the roller box is moved in the direction of the force of the spring element to operate the pawl. The pawl is thus switched into the locking position by means of the spring element. To unlock the pawl, the actuator must work against the force of the compression spring as well as other frictional forces. The spring element rests against the wall means of the roller box.

Preferably, the roller housing has a centering element for the spring element, wherein the spring element is designed as a compression spring and the centering element extends at least partially into the spring element. The centering element is understood to be a pin-like or pin-like element, which is formed significantly shorter than the spring element. Thus, the centering element is not a guide rod extending along the spring element. In this way, mass and material can be saved, among other things.

Preferably, the actuator moves the roller box against the force of the spring. The actuator is therefore configured to transfer the pawl from the locking position into the unlocking position, wherein the spring element is configured to transfer the pawl from the unlocking position into the locking position. The push rod of the actuator transfers the roller housing against the spring force into the unlocking position, whereby the pawl obtains free space, so that the ratchet can be completely removed from the play of the parking lock wheel by the pawl rotating.

According to a preferred embodiment of the invention, a tensioning spring is provided at the pawl, wherein the tensioning spring is designed to return the pawl into the unlocking position. Preferably, the tensioning spring engages in a recess provided for this purpose at the pawl. When the roller housing is moved against the spring force of the spring element, the pawl is pulled out of the tooth space of the parking lock wheel by means of the tensioning spring, so that the rotation of the parking lock wheel is released again. In particular, the tensioning spring is configured to avoid the parking lock wheel as long as the pawl is not pressed through the roller box in the direction of the parking lock wheel, so that the pawl cannot pivot in the direction of the parking lock wheel and inadvertently causes a locking attempt, thereby reducing noise emissions and wear.

Furthermore, the use of the parking lock device according to the invention in combination with a parking lock wheel of a transmission of a motor vehicle is proposed. The parking lock device is preferably integrated in the transmission.

Drawings

Further measures for improving the invention are shown in detail below jointly by means of a description of a preferred embodiment of the invention according to the five figures. Here, it is shown that:

figure 1 shows a schematic cross-sectional view for illustrating a parking lock device according to the invention according to an unlocked position,

figure 2 shows a schematic cross-sectional view for illustrating a parking lock device according to the invention according to a locking position,

figure 3 shows a schematic perspective view of a parking lock device according to the invention,

figure 4 shows another schematic perspective view of a parking lock device according to the invention,

fig. 5 shows a schematic perspective view of a support plate of a parking lock device according to the invention.

Detailed Description

Fig. 1, 2, 3 and 4 show a parking lock device 1 according to the invention for a motor vehicle transmission, not shown here, only fig. 3 showing the parking lock device 1 in its entirety.

According to fig. 1 and 2, the parking lock device 1 comprises a pawl 3 which is pivotally accommodated at a peg 4 about an axis, and a roller box 5 which is arranged between a first side wall and a second side wall 6b of the parking lock device 1 and which is linearly movable for operating the pawl 3. The first side wall 6a is not shown in fig. 1 and 2 due to the sectional view. However, the first side wall 6a is shown in fig. 3, wherein it can be seen that the side walls 6a,6b are arranged parallel to each other. The pawl 3 is designed to cooperate with a toothing of a parking lock wheel of the transmission, not shown here, in order to lock the rotation of the parking lock wheel in the locked position shown in fig. 2 and to release the rotation of the parking lock wheel in the unlocked position shown in fig. 1. Furthermore, two sleeve elements 19a, 19b for threading screws, not shown here, are arranged axially between the two side walls 6a,6b in order to space them apart from one another. The screw is guided through the sleeve elements 19a, 19b and screwed into a threaded bore provided for this purpose in the housing of the transmission, not shown here.

The roller box 5 comprises a first roller 7a and a second roller 7b and wall means 8 for receiving and supporting both rollers 7a, 7b. The first roller 7a is provided at the pawl 3 and the second roller 7b is provided at the raceway wall portion 9. The raceway wall portion 9 is provided between the first and second side walls 6a,6b opposite to the pawl 3. Furthermore, a support plate 10 is provided between the first and second side walls 6a,6b, wherein the roller housing 5 is guided in a rotationally fixed manner between the raceway wall 9 and the support plate 5 when the pawl 3 is actuated.

The actuator 17 is provided for linearly moving the roller box 5 and is connected to the roller box 5 via, for example, a push rod. The actuator 17 is shown in a very simplified manner. According to fig. 2, the spring element 15, which is formed as a compression spring, is arranged spatially between the first and second side walls 6a,6b, the support plate 10 and the raceway wall 9 at the roller box 5. The spring element is not visible in fig. 1, since it is compressed by the roller box 5 in the unlocking position of the pawl 3. As can also be seen from fig. 2, the roller housing 5 has a centering element 16 for the spring element 15, wherein the centering element 16 extends partially into the spring element 15.

If the pawl 3 is actuated, as shown in fig. 2, so as to be in the locked state, the locking tooth of the pawl 3 projects into a tooth space on the parking lock wheel, so that, for example, a driven shaft which is operatively connected to the wheel drive of the motor vehicle is blocked. By means of the parking lock wheel, a force acts on the pawl 3, which force is transmitted via the rollers 7a,7b to the raceway wall 9 and from there to a not shown transmission housing, in which the parking lock device 1 is fastened.

In order to adopt the unlocking position, the actuator 17 moves the roller housing 5 against the spring force and compresses the spring element 15, which presses the roller housing 5 into the locking position of the pawl 3. The push rod of the actuator 17 preferably applies only pressure. In the unlocking position of the pawl 3 shown in fig. 1, the spring element 15 is displaced by the roller housing 5 against the spring force, wherein the spring element 15 is compressed.

During the movement of the roller box 5, the raceway wall 9 and the support plate 10 furthermore have the function of guiding the roller box 5 so that it can rotate as little as possible. The raceway wall 9 guides the roller box 5 on the upper side of the roller box 5, i.e. adjacent to the second roller 7b, wherein the support plate 10 guides the roller box 5 on the lower side of the roller box 5, i.e. adjacent to the first roller 7 a.

The support plate 10 is shown in perspective in fig. 4 and has two guide legs 11a,11b and a base 12 which connects the guide legs 11a,11b to one another in one piece. The roller box 4 slidingly abuts against the guide legs 11a,11b when linearly moving to operate the pawl 3, thereby preventing tilting of the roller box. The pawl 3 extends through a recess between the two guide legs 11a,11 b.

As can be seen in particular from fig. 1 and 2 in conjunction with fig. 5, the wall arrangement 8 of the roller box 5 has two maximally spaced-apart support points 13a,13b for each guide leg 11a,11b of the support plate 10. In fig. 1 and 2, only the support points 13a,13b at the first guide leg 11a of the support plate 10 are shown in a sectional view. The wall device 8, in particular the side wall of the roller box 5, is formed in a partially concave manner between the two support points 13a,13 b. This ensures that the wall arrangement only rests on the support plate 10 at these support points 13a,13b facing away from each other. However, the partially concave geometry is not mandatory and may also be configured in other ways, in particular non-curved. Furthermore, the roller housing 5 has at least two maximally spaced apart support points 14a,14b at the raceway wall 9, wherein a first support point 14a at the raceway wall 9 forms the wall device 8 for the roller housing 5, and wherein a second support point 14b at the raceway wall 9 forms the second roller 7b for the roller housing 5.

As can be seen from fig. 1 and 2, the roller box 5 is guided in position independently at the same point, that is to say even when the pawl 3 does not press the roller box 5 in the direction of the raceway wall 9. As soon as a torque acts on the roller housing 5, for example by a force acting on the pawl 3, said torque is absorbed at the support points 13a,13b, 14a,14b and is guided out into the transmission housing. In particular, the roller box 5 can not form a high angular velocity when tilting by means of a narrow guide between the raceway wall 9 and the guide plate 10, as a result of which the mass inertia forces absorbed by the support points 13a,13b, 14a,14b are small, so that the parking lock unit 1 can be subjected to more load changes.

Fig. 3 shows the parking lock unit 1 in its entirety, so that two side walls 6a,6b are shown. Furthermore, the support plate 10 is shown in the mounted state between the two side walls 6a, 6b. The pawl 3 extends through an opening at the support plate 10 to prevent tilting, among other things.

Fig. 4 shows the parking lock unit 1 without the first side wall in order to obtain a better view of the components of the parking lock unit 1 between the two side walls. It can be seen that the raceway wall portion 9 and the support plate 10 are arranged parallel to each other. Furthermore, the roller box 5 is guided narrowly between the raceway wall portion 9 and the support plate 10, so that the inclination of the roller box 5 can thereby be limited as much as possible.

Description of the reference numerals

1. Parking lock device

3. Pawl for a bicycle

4. Bolt

5. Roller box

6a first side wall

6b second side wall

7a first roller

7b second roller

8. Wall device

9. Raceway wall part

10. Supporting plate

11a guide leg

11b guide leg

12. Base part

13a support part

13b support part

14a support portion

14b support portion

15. Spring element

16. Centering element

17. Actuator

18. Tensioning spring

19a sleeve element

19b sleeve element

Claims

1. A parking lock device (1) for a transmission of a motor vehicle, the transmission having parking lock wheels, the parking lock device comprising: a pawl (3) which is pivotably accommodated at a pin (4) and is designed to cooperate with a toothing of the parking lock wheel in order to lock the rotation of the parking lock wheel in a locked position and release the rotation of the parking lock wheel in an unlocked position, wherein a roller housing (5) is arranged between a first side wall (6 a) and a second side wall (6 b) of the parking lock device (1) and is linearly movable for actuating the pawl (3), wherein the roller housing (5) has at least one first roller (7 a) and one second roller (7 b) and a wall arrangement (8) for accommodating and supporting both rollers (7 a,7 b), wherein the first roller (7 a) is arranged at the pawl (3), wherein the second roller (7 b) is arranged at a raceway wall (9) which is arranged opposite the pawl (3) between the first and second side walls (6 a,6 b),

characterized in that a support plate (10) is arranged between the first and second side walls (6 a,6 b), wherein the roller box (5) is guided between the raceway wall (9) and the support plate (5) when the pawl (3) is actuated.

2. Parking lock device (1) according to claim 1,

characterized in that the support plate (10) has two guide legs (11 a,11 b) and a base (12) which connects the guide legs (11 a,11 b) to each other, wherein the roller box (4) rests against the guide legs (11 a,11 b).

3. The parking lock device (1) according to claim 2,

the wall arrangement (8) of the roller box (5) is characterized in that it has two spaced-apart support points (13 a,13 b) for each guide leg (11 a,11 b).

4. The parking lock device (1) according to claim 3,

the wall device (8) of the roller box (5) is at least partially concave between two support points (13 a,13 b).

5. Parking lock device (1) according to any of the preceding claims,

characterized in that the roller box (5) has at least two spaced apart support points (14 a,14 b) on the raceway wall (9).

6. The parking lock device (1) according to claim 5,

characterized in that at least one support point (14 a) at the raceway wall (9) is provided for a wall arrangement (8) of the roller box (5), and at least one support point (14 b) at the raceway wall (9) is provided for a second roller (7 b) of the roller box (5).

7. Parking lock device (1) according to any of the preceding claims,

characterized in that a spring element (15) is arranged at the roller box (5) at least partially spatially between the first and second side walls (6 a,6 b), the support plate (10) and the raceway wall (9).

8. The parking lock device (1) according to claim 7,

the roller box (5) is characterized in that it has a centering element (16) for the spring element (15), wherein the spring element (15) is designed as a compression spring and the centering element (16) extends at least partially into the spring element (15).

9. Parking lock device (1) according to any of the preceding claims,

characterized in that an actuator (17) for linearly moving the roller box (5) is provided.

10. Parking lock device (1) according to any of the preceding claims,

characterized in that a tensioning spring (18) is provided on the pawl (3), wherein the tensioning spring (18) is designed to return the pawl (3) into the unlocking position.