CN111720538A

CN111720538A - Parking mechanism and vehicle

Info

Publication number: CN111720538A
Application number: CN201910213186.1A
Authority: CN
Inventors: 戚超乾
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Holding China Co Ltd
Priority date: 2019-03-20
Filing date: 2019-03-20
Publication date: 2020-09-29
Anticipated expiration: 2039-03-20
Also published as: CN111720538B

Abstract

The invention relates to a parking mechanism and a vehicle. The parking mechanism comprises a fixing frame, a pawl, a return torsion spring and a retainer assembly, wherein the retainer assembly is installed on the fixing frame and can move between a first position and a second position to push the pawl to rotate between an unlocking position and a locking position, the return torsion spring is respectively connected with the pawl and the fixing frame, one of the retainer assembly and the pawl is provided with a pawl retaining groove extending parallel to the rotating plane of the pawl, one end of a pawl retaining pin is connected with the other of the retainer assembly and the pawl, the other end of the pawl retaining pin is inserted into the pawl retaining groove and moves between two ends of the pawl retaining groove along with the movement of the retainer assembly between the first position and the second position, and when the retainer assembly is located at the first position, the pawl retaining groove is matched with the pawl retaining pin in shape to retain the pawl at the unlocking position. The parking mechanism and the vehicle can prevent the pawl from accidentally engaging the parking ratchet wheel in the driving process of the vehicle.

Description

Parking mechanism and vehicle

Technical Field

The invention relates to the technical field of vehicles. In particular, the present invention relates to a parking mechanism and a vehicle including the same.

Background

Currently, in automatic transmissions of motor vehicles, parking mechanisms commonly employ a ratchet-pawl mechanism to achieve parking lock. The vehicle jolts during driving, and the pawl can shake in an unlocking state, so that the pawl is required to bear large external impact acceleration in any direction and cannot accidentally enter a parking state. To secure the pawl in the unlocked state, a torsion or compression spring is typically used to raise the pawl to the upper limit of travel.

For example, CN 107606145 a discloses a parking mechanism that employs a crank-type lever and lock to push a pawl into engagement with a parking gear. When the parking mechanism is in the unlocked state, the pawl is held in the unlocked position solely by the resilient force provided by the torsion spring. In this solution, the pawl is usually a steel part, with a high dead weight. When the parking brake device is subjected to high external impact acceleration, the elastic force of the torsion spring is required to be relatively large, so that the elastic force of the parking actuating spring is required to be correspondingly increased so as to overcome the resistance of the return torsion spring during parking action, and the size of the parking actuating spring is also large. Meanwhile, the parking executing motor needs extra force to overcome the force of the executing spring when the parking executing spring is released due to the fact that the elastic force of the parking executing spring is large, and then the force and the size of the executing motor are large.

Disclosure of Invention

Therefore, an object of the present invention is to provide a parking mechanism and a vehicle capable of maintaining stability of a pawl unlock state without increasing an elastic force of a return torsion spring.

The above-mentioned technical problem is solved by a parking mechanism according to the present invention. The parking mechanism comprises a fixed frame, a pawl rotatably mounted on the fixed frame, a return torsion spring and a retainer assembly abutted against the side surface of the pawl, wherein the retainer assembly is mounted on the fixed frame and can be driven to move between a first position and a second position relative to the fixed frame, the retainer assembly pushes the pawl to rotate to a locking position when moving from the first position to the second position, two abutting ends of the return torsion spring are respectively connected with the pawl and the fixed frame so as to pull the pawl to return to an unlocking position when moving from the second position to the first position, the parking mechanism further comprises a pawl holding pin, one of the retainer assembly and the pawl is provided with a pawl holding groove extending parallel to a rotating plane of the pawl, one end of the pawl holding pin is connected with the other of the retainer assembly and the pawl, and the other end of the pawl holding pin is inserted into the pawl holding groove and is held by the pawl along with the movement of the retainer assembly between the first position and the second position The pawl holding slot holds the pawl in the unlocked position by a positive fit with the pawl holding pin when the cage assembly is in the first position. When the vehicle runs, the parking mechanism is unlocked, the retainer assembly is stabilized at the first position under the action of the driving mechanism, and the pawl can be stably maintained at the unlocking position through the shape matching of the pawl holding pin and the pawl holding groove because the position of the pawl holding pin in the pawl holding groove has the corresponding relation with the rotating position of the pawl. Therefore, even if the elastic force of the return torsion spring is not large, the pawl cannot be accidentally engaged with the parking ratchet wheel due to vibration in the running process of the vehicle, so that the force required to be provided by the return torsion spring and the driving mechanism can be reduced, and the size of the return torsion spring is further reduced.

According to a preferred embodiment of the present invention, the pawl holding slot includes at least a continuous unlocking holding section and a transition section, the unlocking holding section extending at an angle to the transition section, the pawl holding pin being held in the unlocking holding section when the cage assembly is in the first position. The dog-ear between the release holding section and the transition section helps to further prevent the pawl from accidentally coming out of the release position in the released parking engagement state.

According to another preferred embodiment of the present invention, the pawl holding groove further includes a locking section, the locking section and the unlocking holding section are connected to opposite ends of the transition section, respectively, and the locking section extends at an angle to the transition section, and the pawl holding pin is held in the locking section when the cage assembly is in the second position. The dog-ear between the locking section and the transition section may also assist in holding the pawl in the locked position.

According to a further preferred embodiment of the invention, the width of the unlocking holding section is smaller than the width of the transition section. The design is such that the pawl holding pin can move smoothly in the pawl holding groove when the locked state of the pawl is switched, because the rotation of the pawl does not need the pawl holding groove for guiding, and the requirement on the matching relation of the pawl holding pin and the transition section is low.

According to another preferred embodiment of the present invention, the parking mechanism further comprises a pawl shaft, and the pawl is rotatably connected to the fixed frame by the pawl shaft. Preferably, the return torsion spring is sleeved on the pawl shaft.

According to another preferred embodiment of the present invention, the holder assembly includes a guide rod passing through a guide rod top plate fixed to the fixing frame so as to guide the linear movement of the holder assembly with respect to the fixing frame. Preferably, the parking mechanism further comprises an actuating spring sleeved on the guide rod, and the actuating spring abuts between the retainer assembly and the guide rod top plate.

According to another preferred embodiment of the present invention, the cage assembly further includes a roller rotatably mounted on the cage assembly, the cage assembly abutting the side surface of the pawl by the roller. Preferably, the roller shaft of the roller is movably supported on the mount, thereby mounting the cage assembly on the mount.

The above technical problem is also solved by a vehicle according to the present invention, which includes a parking mechanism having the above features.

Drawings

The invention is further described below with reference to the accompanying drawings. Identical reference numbers in the figures denote functionally identical elements. Wherein:

FIG. 1 is an exploded schematic view of a parking mechanism according to an embodiment of the present invention;

FIGS. 2-5 are schematic views of the park mechanism of FIG. 1 being assembled in steps;

FIG. 6 is a schematic view of a locked state of the parking mechanism according to an embodiment of the present invention;

fig. 7 is a schematic view of an unlocked state of the parking mechanism according to the embodiment of the present invention; and

fig. 8 is a schematic view of a pawl holding groove of the parking mechanism according to an embodiment of the present invention.

Detailed Description

Embodiments of a parking mechanism and a vehicle according to the present invention will be described below with reference to the accompanying drawings. The following detailed description and drawings are included to illustrate the principles of the invention, which is not to be limited to the preferred embodiments described, but is to be defined by the appended claims.

Fig. 1 shows an exploded schematic view of a parking mechanism according to an embodiment of the present invention, wherein the manner of interconnection and assembly of the various components is shown in steps in fig. 2 to 5. As shown, the parking mechanism includes a fixed bracket, a pawl 10, and a cage assembly 60. The holder may be formed of two plate-shaped parts arranged in parallel, i.e., a first holder 70 and a second holder 80, which may be connected to each other at a distance by a guide bar top plate 90 and a connecting plate 100. It should be noted that the above-mentioned structure of the fixing frame is only exemplary, and those skilled in the art can design the fixing frame as an integral structure, a non-plate structure or other structures based on specific needs, as long as the function of installing and fixing other components can be achieved, and the invention does not limit the specific form of the fixing frame.

As shown in fig. 2 and 3, the ratchet 10 is mounted on the fixing frame, for example, by a ratchet shaft 20, and can rotate relative to the fixing frame by the ratchet shaft 20. In the present embodiment, the pawl shaft 20 is a separate member that passes through the pivot hole of the pawl 10 and is supported at both ends thereof on the first fixed frame 70 and the transmission case (not shown), respectively, so that the pawl 10 is rotatably mounted between the two fixed frame members. This mounting is merely exemplary, and the detent shaft 20 may also be fixedly connected to (e.g., integrally formed with) one of the fixed mount and the detent 10, and the particular mounting position of the detent 10 on the fixed mount may also be adjusted depending on the particular configuration of the fixed mount and the transmission, e.g., the detent shaft 20 may also be supported entirely by the transmission housing or entirely by two fixed mount members. The return torsion spring 30 is sleeved on the pawl shaft 20, and two forced abutting ends of the return torsion spring abut against the pawl 10 and the fixing frame respectively (for example, the return torsion spring is clamped into the mounting notches of the pawl 10 and the second fixing frame 80 respectively).

As shown in fig. 1, the holder assembly 60 preferably has a guide rod 61, one end of which may be fixedly attached to the body frame of the holder assembly 60, for example, and the other end of which passes through a guide hole in a guide rod top plate 90. As shown in fig. 4, the cage assembly 60 is preferably mounted in the plane of rotation of the pawl 10 and the guide rod 61 extends in the plane of rotation. The actuator spring 50 is fitted over the guide rod 61 and abuts between the holder unit 60 (e.g., on the frame body of the holder unit 60) and the guide rod top plate 90. As shown in fig. 5, the cage assembly 60 is mounted to the mount, for example, by one or more shafts extending from its body frame, which engage in mounting slots formed in the mount, thereby allowing linear movement of the cage assembly 60 relative to the mount between two extreme positions, a first position and a second position. The side surface of the pawl 10 is kept engaged with the cage assembly 60 by the elastic force of the return torsion spring 30, and when parking, the actuator spring 50 pushes the cage assembly 60 to move to a second position (exemplarily shown as a right side in the drawing) shown in fig. 6, thereby pushing the pawl 10 to rotate downward to a locking position where the pawl 10 engages a parking ratchet (not shown), thereby achieving parking braking of the vehicle. When the parking is released, the cage assembly 60 is moved to the first position (exemplarily shown as the left side) shown in fig. 7 against the elastic force of the actuator spring 50 under the driving of a driving mechanism (e.g., an actuator motor, not shown). Due to the change in position of the cage assembly 60, the pawl 10 is rotated upward by the elastic force of the return torsion spring 30 to remain engaged with the cage assembly 60, thereby disengaging the parking ratchet to the unlocked position. In a preferred embodiment, the cage assembly 60 may have rollers 62 rotatably mounted on the body frame of the cage assembly 60. Cage assembly 60 engages pawl 10 via rollers 62, which creates rolling friction between cage assembly 60 and the side surfaces of pawl 10, which helps to reduce friction and improve smoothness of movement. In addition, additional rollers 62 'may be rotatably mounted on the opposite side of the cage assembly 60, with one side of the rollers 62' in rolling contact with the rollers 62 and the other side in rolling contact with the web 100, thereby further improving the stability of the cage assembly 60 during movement. Further preferably, the cage assembly 60 may be supported on the mount by roller axles of the rollers 62, 62' and the guide bar 61 and moved relative to the mount by engagement between the roller axles and mounting slots on the mount.

As shown in fig. 6 and 7, the holder assembly 60 has a pawl holding groove 63 extending parallel to the rotation plane of the pawl 10, which is formed, for example, on one side panel of the main body frame of the holder assembly 60. The pawl holding pin 40 has one end connected to the pawl 10 and one end slidably inserted into the pawl holding groove 63. The pawl holding pin 40 may be formed as a separate member inserted into the mounting hole of the pawl 10, or may be formed integrally with the pawl 10, which is not limited in the present invention. When the cage assembly 60 is in the second position of fig. 6, the pawl 10 is in the locked position with the pawl retaining pin 40 at one end of the pawl retaining slot 63; when the holder assembly 60 moves to the first position shown in fig. 7, the pawls 10 are restored to the unlocking positions by the elastic force of the return torsion spring 30, and the pawl holding pin 40 is moved to the other end of the pawl holding groove 63. When the parking mechanism is unlocked when the vehicle is running, the retainer assembly 60 is stabilized in the first position by the driving mechanism, and the pawl 10 can be stably held in the unlocked position by the shape fit of the pawl holding pin 40 and the pawl holding groove 63 because the position of the pawl holding pin 40 in the pawl holding groove 63 has a corresponding relationship with the rotational position of the pawl 10. Thus, even if the elastic force of the return torsion spring 30 is not large, the pawl 10 does not accidentally engage the parking ratchet wheel due to vibration during the running of the vehicle, so that the force required to be provided by the return torsion spring 30 and the driving mechanism can be reduced, and the size of the parking ratchet wheel can be reduced.

According to an alternative embodiment, the positional relationship of the pawl holding slot 63 and the pawl holding pin 40 may be interchanged, i.e., the pawl holding slot 63 is formed on the pawl 10 and the pawl holding pin 40 is mounted on the cage assembly 60. In this alternative arrangement, the principle of relative movement of the pawl holding slot 63 and the pawl holding pin 40 is similar to the previous embodiment and will not be described in detail herein.

According to a further preferred embodiment, the pawl holding groove 63 may have at least a continuous unlocking holding section 631 and a transition section 632. As shown in fig. 8, the unlocking holding section 631 and the transition section 632 extend at an angle to each other, that is, a dog-ear angle is formed therebetween. When the pawl 10 is in the unlocked position, the pawl holding pin 40 is located at the end of the pawl holding slot 63 where the release holding section 631 is located, and the break angle between the release holding section 631 and the transition section 632 helps to further prevent the pawl holding pin 40 from accidentally falling out of the unlocked position when the parking engagement is released. The pawl holding pin 40 moves in the transition section 632 as the pawl 10 rotates between the unlocked position and the locked position. The width of the transition section 632 is preferably greater than the width of the unlock holding section 631 so that the pawl holding pin 40 can smoothly move in the pawl holding groove 63 when the locked state of the pawl 10 is switched. Furthermore, the pawl holding groove 63 may also have a locking section 633, and the unlocking holding section 631 and the locking section 633 are respectively connected to opposite ends of the transition section 632. The locking section 633 also extends at an angle to the transition section 632 to assist in retaining the pawl 10 in the locked position.

In a further embodiment of the invention, there is also provided a vehicle, in particular a motor vehicle using an automatic gearbox, fitted with a parking mechanism according to the above embodiment.

Although possible embodiments have been described by way of example in the above description, it should be understood that numerous embodiment variations exist, still by way of combination of all technical features and embodiments that are known and that are obvious to a person skilled in the art. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. From the foregoing description, one of ordinary skill in the art will more particularly provide a technical guide to convert at least one exemplary embodiment, wherein various changes may be made, particularly in matters of function and structure of the components described, without departing from the scope of the following claims.

List of reference numerals

10 ratchet pawl

20 ratchet shaft

30 return torsion spring

40 pawl retaining pin

50 executive spring

60 cage assembly

61 guide bar

62. 62' roller

63 pawl holding groove

631 unlock retention segment

632 transition section

633 locking segment

70. 80 fixed mount

90 guide rod top plate

100 connecting plate

Claims

1. A parking mechanism comprising a fixed frame (70, 80), a pawl (10) rotatably mounted on the fixed frame (70, 80), a return torsion spring (30), and a cage assembly (60) abutting a side surface of the pawl (10), the cage assembly (60) being mounted on the fixed frame (70, 80) and being drivable to move relative to the fixed frame (70, 80) between a first position and a second position, the cage assembly (60), when moving from the first position to the second position, urging the pawl (10) to rotate to a locked position, both abutting ends of the return torsion spring (30) being connected with the pawl (10) and the fixed frame (70, 80), respectively, to pull the pawl (10) to return to an unlocked position when the cage assembly (60) moves from the second position to the first position,

it is characterized in that the preparation method is characterized in that,

the parking mechanism further includes a pawl holding pin (40), one of the cage assembly (60) and the pawl (10) has a pawl holding groove (63) extending parallel to a rotation plane of the pawl (10), one end of the pawl holding pin (40) is connected to the other of the cage assembly (60) and the pawl (10), and the other end is inserted into the pawl holding groove (63) and moves between both ends of the pawl holding groove (63) with movement of the cage assembly (60) between the first position and the second position, and the pawl holding groove (63) holds the pawl (10) in the unlocked position by shape-fitting with the pawl holding pin (40) when the cage assembly (60) is in the first position.

2. The parking mechanism of claim 1, wherein the pawl holding slot (63) comprises at least a continuous unlocking holding section (631) and a transition section (632), the unlocking holding section (631) extending at an angle to the transition section (632), the pawl holding pin (40) being held in the unlocking holding section (631) when the cage assembly (60) is in the first position.

3. The parking mechanism according to claim 2, wherein the pawl holding groove (63) further comprises a locking section (633), the locking section (633) and the unlocking holding section (631) being connected to opposite ends of the transition section (632), respectively, and the locking section (633) extending at an angle to the transition section (632), the pawl holding pin (40) being held in the locking section (633) when the cage assembly (60) is in the second position.

4. The parking mechanism according to claim 2, characterized in that the width of the unlocking holding section (631) is smaller than the width of the transition section (632).

5. Parking mechanism according to one of claims 1 to 4, characterized in that it further comprises a pawl shaft (20), said pawl (10) being rotatably connected to said fixed frame (70, 80) by means of said pawl shaft (20).

6. The parking mechanism according to claim 5, wherein the return torsion spring (30) is sleeved on the pawl shaft (20).

7. Parking mechanism according to one of claims 1 to 4, characterized in that the cage assembly (60) comprises a guide rod (61), the guide rod (61) passing through a guide rod top plate (90) fixed to the fixing frame (70, 80) so as to guide the linear movement of the cage assembly (60) relative to the fixing frame (70, 80).

8. Parking mechanism according to claim 7, characterized in that it further comprises an actuation spring (50) fitted over the guide rod (61), the actuation spring (50) abutting between the cage assembly (60) and the guide rod top plate (90).

9. Parking mechanism according to one of claims 1 to 4, characterized in that said cage assembly (60) further comprises a roller (62) rotatably mounted on said cage assembly (60), said cage assembly (60) abutting the side surface of said pawl (10) through said roller (62).

10. Parking mechanism according to claim 9, wherein the roller axle of the roller (62) is movably supported on the fixture (70, 80) for mounting the cage assembly (60) on the fixture (70, 80).

11. A vehicle comprising a parking mechanism according to any one of claims 1 to 10.