CN113932010A

CN113932010A - Actuating assembly for parking mechanism and parking mechanism

Info

Publication number: CN113932010A
Application number: CN202010672111.2A
Authority: CN
Inventors: 甘伟彪
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Holding China Co Ltd
Priority date: 2020-07-14
Filing date: 2020-07-14
Publication date: 2022-01-14

Abstract

The invention relates to an actuating assembly for a parking mechanism and the parking mechanism. The actuating assembly (2) is used for actuating a locking member (4) of the parking mechanism and comprises an actuating rod (202), a sliding member (201) and an elastic member (203), wherein the actuating rod can move between a parking position and a releasing parking position; a sliding member slidably disposed at the actuating lever with respect to the actuating lever and capable of actuating the locking member to effect or release parking; a resilient member tensioned in the longitudinal direction between the sliding member and a resilient member stop (206) fixed in the longitudinal direction relative to the actuating rod, wherein a protection stop (207) is provided at the actuating rod, wherein the protection stop is capable of stopping the sliding member in the longitudinal direction such that a longitudinal length of the resilient member remains greater than a compression failure length of the resilient member. The parking mechanism comprises a locking component and the executing component.

Description

Actuating assembly for parking mechanism and parking mechanism

Technical Field

The invention relates to the technical field of vehicles. The invention particularly relates to an actuating assembly for a parking mechanism and the parking mechanism.

Background

The parking mechanism is a safety device in the active safety design of a motor vehicle transmission, which can prevent the vehicle from engaging P gear at a high speed or preventing the vehicle from coasting on a slope. There are currently a number of parking mechanism designs.

For example, in chinese patent application CN 107606145a, a parking mechanism is disclosed, which comprises a housing, a parking gear, a pawl, a stopper, a lever assembly and a driving mechanism, wherein the pawl is spaced apart from the parking gear in a non-parking state; the stop block is fixedly connected with the shell and is positioned on one side of the pawl, which is far away from the parking gear; the pull rod assembly is positioned between the pawl and the stop block; the drive mechanism is connected with the pull rod assembly through the drive shaft, and the pawl is pivotally mounted on the drive shaft, so that the pull rod assembly is suitable for abutting against the stop block and the pawl to push the pawl to rotate to lock the parking gear.

However, when the parking is released on the slope, because a part of the gravity of the motor vehicle acts on the ratchet wheel, the ratchet wheel can push the pawl to rebound quickly, the pawl can knock the wedge block at the pull rod, the wedge block rebounds quickly to compress the execution spring, the execution spring is pressed in the limit condition, the spring force is attenuated, the critical parking speed is reduced, and the parking on the slope cannot be performed in the serious condition.

Disclosure of Invention

The object of the present invention is therefore to provide a parking mechanism with increased functional reliability.

The above-mentioned object is achieved in one aspect of the invention by an actuator assembly for a parking mechanism. The actuating assembly is used to actuate a locking member of the parking mechanism. The execution component comprises: an actuating lever, a slide member, and an elastic member. Here, the actuating lever is movable between a parking position and a release parking position; a sliding member slidably disposed at the actuating lever with respect to the actuating lever and capable of actuating the locking member to effect or release parking; the elastic member is tensioned between the sliding member and an elastic member stopper fixed in the longitudinal direction with respect to the actuating rod. According to an aspect of the invention, a protection stop is provided at the actuating rod, wherein the protection stop is capable of stopping the sliding member in the longitudinal direction such that the longitudinal length of the elastic member remains greater than the compression failure length of the elastic member.

The parking mechanism is in particular a component of a parking brake system for a motor vehicle transmission. The parking brake system may be a conventional mechanical parking brake system such as a hand brake, or an electronic parking brake system implemented by an electronic control method. In the present context, reference is made primarily to a locking assembly and an actuating assembly of a parking brake system.

The locking assembly preferably comprises a locking member of the parking mechanism and a locking counterpart member. In the case of a mutual engagement, in particular a form-fit engagement, of the locking member and the locking counterpart member, parking can be carried out. Particularly preferably, the locking assembly is configured as a pawl-ratchet assembly, wherein the locking member is configured as a pawl and the locking counter-member is configured as a ratchet. The ratchet wheel is arranged in a rotationally fixed manner, for example, on a transmission shaft, in particular on a transmission output shaft, in a transmission or differential of a motor vehicle. The pawl is mounted, for example, rotatably on a pawl shaft, which is arranged fixedly with respect to the center axis of the ratchet wheel, in particular fixedly with respect to the transmission housing. In this case, when the pawl swings so that the tooth engages into the tooth groove of the ratchet wheel, parking can be achieved; parking can be released when the pawl oscillates such that the teeth disengage from the gullets of the ratchet.

Here, the actuating assembly includes an actuating lever, a sliding member, and an elastic member.

The actuating rod preferably has a rod-like structure. Within the scope of this document, the terms "longitudinal" and "longitudinal axis" refer to the longitudinal or longitudinal axis of an implement lever, unless otherwise indicated. In the embodiment in which the locking member is moved by a pivoting movement and the parking is released, the longitudinal axis of the actuating lever can intersect, in particular be orthogonal, to a pivoting plane of the locking member; alternatively, the longitudinal axis of the actuating rod may lie in the swivel plane of the locking member. When the actuator lever is in the parking position, the lock member and the lock counterpart member can be engaged with each other to park. When the actuating lever is in the parking release position, the lock member and the lock counterpart member can be disengaged to release the parking.

The sliding member is arranged in a manner slidable relative to the actuating rod, preferably sleeved at the actuating rod. Preferably, the sliding member slides in the region of one longitudinal end of the actuating rod, wherein this one longitudinal end is opposite the other longitudinal end of the actuating rod, to which a rotational and/or translational movement can be applied by the drive assembly of the parking mechanism. Advantageously, a sliding member stop is provided at the one longitudinal end of the actuating lever to prevent the sliding member from disengaging from the actuating lever. Advantageously, the outer surface of the sliding member, preferably the sliding member, has a structure that is locally adapted to the locking member, such that when the sliding member moves with movement of the actuating lever, an actuating force applied at the actuating lever can be transmitted to the locking assembly via the adapted structure to effect or release the engagement between the locking member and the locking counterpart member.

Additionally, the actuation assembly further includes a guide member, wherein the guide member is configured and arranged such that the guide member has a configuration that matches an end of the slide member such that the slide member may be at least partially retained by the guide member when the actuation lever is in the park position to avoid a cantilevered arrangement of the actuation lever. Advantageously, the guide member is fixedly arranged relative to the transmission housing. In this case, the slide member can be more stably abutted against the lock member with the aid of the guide member.

The elastic member is in a pre-tensioned state upon completion of assembly of the actuator assembly. The pretension of the elastic member is such that the sliding member can be at the longitudinal end of the actuating rod. The elastic member may urge the slide member reliably against the lock member with a buffer mechanism to perform parking when parking.

In a preferred embodiment, the elastic member is configured as an actuating spring, in particular as a helical compression spring. Alternatively, the elastic means may also be embodied as means constructed from an elastic material or as a component having a damping function, for example a hydraulic or pneumatic device.

In the context of this document, a protective stop provided at the actuating lever can delimit the sliding member within a predetermined longitudinal region of the actuating lever. The predetermined longitudinal area is provided in such a way that the elastic component clamped between the sliding component and the elastic component stop is not excessively compressed and thus fails. Here, the compression failure length of the elastic member is, for example, a longitudinal length at which the elastic member is compressed to fail or a longitudinal length at which the elastic member is compressed to have a high risk of failure. In embodiments where the resilient member is configured as a helical compression spring, the compression failure length of the resilient member may be the combined compression length of the helical compression spring or a longitudinal length slightly greater than the combined compression length. By virtue of the design provided in this document, it is possible to avoid: in the case where a force applied to a lock mating member such as a ratchet is large, when parking is released, the ratchet pushes a lock member such as a pawl to rapidly rebound and swing, and the lock member strikes a slide member with a large force, so that an elastic member such as an actuating spring is compressed to a compression failure length such as a parallel compression length, resulting in attenuation of the elastic force of the elastic member such as a spring force, causing a decrease in the critical parking speed of the parking brake system, and in severe cases, causing a failure in parking on a slope. In this case, the locking counter-part is subjected to a high force, for example, when the motor vehicle is located on a steep slope, in which case a part of the weight of the motor vehicle acts on the locking counter-part, for example, on the ratchet. With the solution provided herein, the parking mechanism has an enhanced functional reliability.

In an advantageous embodiment, the protective stop can be designed as a step at the actuating lever or as a projection projecting over the outer circumference of the actuating lever. Preferably, the actuating lever can be designed as a step shaft, wherein a protective stop is formed on a longitudinal end face of the actuating lever at the step. Alternatively, a protrusion may be formed on the outer circumferential surface of the actuating rod, and the protrusion may be a protrusion ring that continuously surrounds the actuating rod in a ring shape in the circumferential direction of the actuating rod, or may be a protrusion that is intermittently arranged in the circumferential direction of the actuating rod. The projection can be formed integrally on the actuating lever or can be produced separately and mounted fixedly at the actuating lever at least in the longitudinal direction.

In a preferred embodiment, the actuating assembly further comprises a protective member, wherein one longitudinal end of the protective member can abut against the sliding member and the other longitudinal end of the protective member can abut against the protective stop. In this case, when the protective stop performs a longitudinal stop for the sliding element, the protective stop does not directly contact the sliding element, but rather is realized by means of an intermediately arranged protective element. Thereby, the sliding member can be prevented from directly hitting the protection stopper. Furthermore, the structural deformation of the protective member for the sliding member and/or the actuating rod for achieving the longitudinal stop can be simplified by its own structure.

Particularly preferably, the protective member is configured as a separate elastic buffer. Whereby the impact energy of the sliding member hitting the protection stopper can be absorbed by the protection member. The elastic buffer is, for example, a spring, a member constructed of an elastic material such as rubber, or a component having a buffering function such as a hydraulic or pneumatic device.

Alternatively, the protective member comprises an elastomeric buffer and a stop, wherein the elastomeric buffer is arranged longitudinally between the sliding member and the stop.

In an advantageous embodiment, the elastic member bears with its one longitudinal end against the protective member and with its other longitudinal end against the elastic member stop. Here, it is understood that the slide member, the protective member, the elastic member, and the actuating rod are similarly arranged in series in this order in terms of transmission of the impact force of the slide member. In this case, the longitudinal distance between the stop face of the protection stop and the stop face of the resilient member stop is greater than the compression failure length of the resilient member.

In this case, the protective member is preferably designed as at least one disk spring. The disk spring can provide, on the one hand, a strong damping capacity required as an elastic buffer and, on the other hand, a contact surface which is easily in abutment with the sliding element and with the elastic element. In addition, the axial size of the disc spring is small, and the disc spring is suitable for the condition that the requirement on the longitudinal space in the actuating mechanism is small. Furthermore, depending on the particular operating conditions of the motor vehicle, in particular in connection with the parking brake system, one disk spring or at least two disk springs can be used. In the case of at least two disk springs, the disk springs are combined in different ways, for example, in a folded-together or folded-together manner, so that the spring characteristics can be varied over a wide range.

In an alternative embodiment, the elastic component rests with its one longitudinal end against the sliding component and with its other longitudinal end against the elastic component stop. Here, it can be understood that the protective member and the elastic member are arranged between the slide member and the actuating lever in a parallel-like manner in terms of transmission of the impact force of the slide member. In this case, the sum of the longitudinal distance between the stop face of the protection stop and the stop face of the elastic member stop and the extreme longitudinal dimension of the protection member is greater than the compression failure length of the elastic member. Here, the limiting longitudinal dimensions of the protective member are: the longitudinal dimension of the protection member, which is not compressed or compressed, when the sliding member is at the boundary of the elastic member side of the above-mentioned predetermined longitudinal area of the actuating rod.

The above object is achieved in another aspect of the present invention by a parking mechanism. Here, the parking mechanism includes a lock member and the actuator assembly according to the above embodiment.

Drawings

A preferred embodiment of the invention is schematically illustrated in the following with reference to the accompanying drawings. The attached drawings are as follows:

FIG. 1 is a schematic perspective view of a parking mechanism according to a preferred embodiment;

FIG. 2 is a side view of an actuator assembly of the park mechanism of FIG. 1 in a first operating condition;

FIG. 3 is a side cross-sectional view of an actuator assembly of the park mechanism of FIG. 1 in a first operating condition;

FIG. 4 is an enlarged view of a portion of FIG. 3;

FIG. 5 is a side cross-sectional view of the protective member of the actuator assembly of FIG. 3;

FIG. 6 is a side view of an actuator assembly of the park mechanism of FIG. 1 in a second operating condition; and

fig. 7 is a side cross-sectional view of an actuator assembly of the park mechanism of fig. 1 in a second operating condition.

Detailed Description

Fig. 1 schematically shows a perspective view of a parking mechanism according to a preferred embodiment. The parking mechanism is installed in a transmission of a motor vehicle, for example. The parking mechanism here forms part of a parking brake system of the transmission, of which the locking assembly and the actuating assembly are shown here.

The locking assembly is implemented in this embodiment as a pawl and ratchet assembly. The pawl-ratchet assembly here comprises a pawl 4 as a locking member and a ratchet 5 as a locking counter member. The ratchet wheel 5 is arranged in a rotationally fixed manner at the transmission output shaft of the transmission. The pawl 4 is rotatably mounted at a pawl shaft 6, the pawl shaft 6 being fixedly mounted relative to the transmission housing. In this case, when the pawl 4 swings around the pawl shaft 6 such that the tooth portion of the pawl 4 engages into the tooth groove of the ratchet 5, the transmission output shaft can be locked, achieving parking; when the pawl 4 swings around the pawl shaft 6, so that the tooth part of the pawl 4 is disengaged from the tooth groove of the ratchet wheel 5, the locking of the output shaft of the transmission can be released, and the parking can be released.

Fig. 2 and 3 show a side view and a side sectional view, respectively, of an actuating assembly of the parking mechanism according to the present embodiment in a first operating state. Fig. 6 and 7 show a side view and a side cross-sectional view, respectively, of an actuating assembly of the parking mechanism according to the present embodiment in a second operating state.

The actuator assembly is implemented as a slider assembly 2 in this embodiment. As can be seen in conjunction with fig. 1 to 3, 6 and 7, the slider assembly 2 here comprises an actuating rod 202, a sliding member 201 and an elastic member 203.

The actuating lever 202 is in this embodiment perpendicular to the plane of oscillation of the pawl 4. One longitudinal end of the actuating lever 202 is mounted at the rocker arm assembly 7 by means of a pin 1. Here, the rocker arm assembly 7 is slidably mounted to the pawl shaft 6. The actuating lever 202 is able to translate, under the actuation of the rocker arm assembly 7, in a direction perpendicular to the plane of oscillation of the pawl 4, i.e. in the longitudinal direction of the actuating lever 202, between two different longitudinal positions, i.e. a parking position and an out-of-parking position.

The sliding member is implemented as a wedge block 201 in this embodiment. Wedge block 201 has a central through hole. Here, the wedge block 201 is fitted around the outer periphery of the actuating rod 202 through its central through hole in such a manner as to be slidable relative to the actuating rod 202. Here, a sliding member stopper, i.e., a wedge block stopper 205, is integrally formed at a longitudinal end of the actuating lever 202 away from the rocker arm assembly 7 to prevent the wedge block from falling off the actuating lever 202. The outer circumferential surface of wedge block 201 has a contour that matches the recess of pawl 4 facing away from the pawl toothing thereof, so that a longitudinal displacement of wedge block 201 with actuating rod 202 can be converted into a pivoting movement of pawl 4 by means of the above-described matching contour, and thus the parking can be carried out or released.

Furthermore, the actuating assembly comprises a guide member embodied as a guide block 3. The guide block 3 is fixed to the transmission housing. The guide block 3 has an inner portion configured to match the outer peripheral surface of the wedge block 201. Wedge-shaped blocks 201 are thus advantageously supported in the radial direction.

The elastic member is implemented as a coil compression spring type actuator spring 203 in the present embodiment. Upon completion of the assembly of actuator assembly 2, actuator spring 203 is tensioned between wedge block 201 and an elastic member stop fixed in the longitudinal direction relative to actuator rod 202, i.e., actuator spring stop 206. The actuating spring stop 206 is embodied here as an annular collar which is integrally formed on the outer circumference of the actuating rod 202. The pretension of actuator spring 203 here allows wedge shoe 201 to remain at wedge shoe stop 205 of actuator rod 202 without carrying excessive force.

The actuator according to this embodiment further comprises a protective member 204. Fig. 4 is a partially enlarged view of fig. 3, in which the arrangement of the protection member 204 is shown enlarged. Fig. 5 shows a side sectional view of the protective member 204 of the present embodiment.

As shown in fig. 4 and 5, the protective member is configured as a disc spring 204 in the present embodiment. Here, disk spring 204 rests with its large-diameter end against a spring-side longitudinal stop surface of wedge block 201, wherein the longitudinal stop surface is formed by the annular groove base of the groove formed in wedge block 201. Further, the disc spring 204 abuts the actuator spring 203 with its small diameter end. In this case, the actuator spring 203 bears with its one longitudinal end against the actuator spring 203 and with its other longitudinal end against the actuator spring stop 206.

In the present embodiment, the actuating lever 202 is implemented as a stepped shaft, the longitudinal end surface of the step of which forms a protective stop 207 that can abut against the small diameter end of the belleville spring 204. The stop surface of the protective stop 207, i.e. the longitudinal end surface of the step, is at a greater longitudinal distance from the stop surface of the actuator spring stop 206 than the contact length of the actuator spring 203. Thus, wedge block 201 is confined within a predetermined longitudinal area of actuator rod 202, and actuator spring 203 is not over-compressed to fail.

When the ratchet 5 is less stressed during parking or when parking is not performed, the actuating spring 203 can stably hold the wedge block 201 at the longitudinal end of the actuating rod 202. This is illustrated by the illustration of the executing components in the first operating state in fig. 2 and 3.

When parking is released, in the case that the ratchet 5 is subjected to a large force due to, for example, a motor vehicle being located on a steep slope, the ratchet 5 pushes the pawl 4 to rapidly rebound and swing, the pawl 4 strikes the wedge block 201 with a large force, and the wedge block 201 rapidly slides toward the rocker arm assembly side until the small-diameter end of the belleville spring 204 abuts against the protection stop 207. Belleville spring 204 absorbs some of the impact energy, protecting wedge block 201 and protecting stop 207. In this case, the actuator spring 203 is not compressed to a compression failure length such as a parallel compression length, and the spring force of the actuator spring 203 is not attenuated accordingly, ensuring the functional reliability of the parking mechanism. This is illustrated by the illustration of the executive components in the second operating state in fig. 6 and 7.

In an alternative embodiment, the protective member comprises an elastomeric bumper and a stop. The elastic buffer is configured, for example, as a helical compression spring which is compressible in the longitudinal direction. The stop is configured, for example, as a washer. Here, a helical compression spring serving as an elastic buffer is disposed in the longitudinal direction between the wedge block 201 and a washer serving as a stopper, which abuts at the actuating spring 203, thereby facilitating transmission of a force in the longitudinal direction between the elastic buffer and the actuating spring 203. Furthermore, the washer can also rest against the above-mentioned protective stop 207 formed by the actuating rod 202 configured as a stepped shaft. Wedge block 201 may thus also be confined within a predetermined longitudinal area of actuator rod 202 without actuator spring 203 being over-compressed to fail.

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

1 Pin

2 executing assembly and slide block assembly

3 guide member, guide block

4 locking member, pawl

5 locking the counterpart member, ratchet

6 pawl shaft

7 Rocker arm Assembly

201 sliding member, wedge block

202 executive rod

203 elastic member, actuator spring

204 protective member, belleville spring

205 sliding member stop, wedge block stop

206 elastic member stopper, actuator spring stopper

207 protective stop

Claims

1. Actuator assembly (2) for a parking mechanism, said actuator assembly (2) being for actuating a locking member (4) of said parking mechanism, said actuator assembly (2) comprising:

-an actuator lever (202) movable between a parking position and an out-of-park position;

-a sliding member (201) slidably arranged at the actuating lever (202) with respect to the actuating lever (202) and able to actuate the locking member (4) to effect or release parking; and

-an elastic member (203) longitudinally tensioned between the sliding member (201) and an elastic member stop (206) longitudinally fixed with respect to the actuating rod (202),

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

a protective stop (207) is provided at the actuating rod (202), wherein the protective stop (207) is configured to stop the sliding member (201) in a longitudinal direction such that a longitudinal length of the resilient member (203) remains greater than a compression failure length of the resilient member (203).

2. The actuating assembly according to claim 1, wherein the protective stop is configured as a step (207) at the actuating rod (202) or a protrusion protruding from the outer circumferential surface of the actuating rod (202).

3. The actuation assembly of claim 1, wherein the resilient member is configured as an actuation spring (203).

4. The actuating assembly according to claim 1, wherein the actuating assembly (2) further comprises a protective member (204), wherein one longitudinal end of the protective member (204) is abuttable against the sliding member (201) and the other longitudinal end of the protective member (204) is abuttable against the protective stop (207).

5. The actuating assembly according to claim 4, wherein the protective member is configured as an elastomeric bumper (204).

6. The actuating assembly of claim 4, wherein the protective member includes an elastomeric bumper and a stop, wherein the elastomeric bumper is longitudinally disposed between the sliding member and the stop.

7. The actuating assembly according to any of claims 4 to 6, wherein the resilient member (203) abuts with one longitudinal end thereof against the protective member (204) and with the other longitudinal end thereof against the resilient member stop (206).

8. The actuating assembly (2) according to claim 7, wherein the protective member is configured as at least one belleville spring (204).

9. The actuating assembly according to any one of claims 4 to 6, wherein the resilient member abuts with one longitudinal end thereof against the sliding member and with the other longitudinal end thereof against the resilient member stop.

10. Parking mechanism comprising a locking member (4) and an actuator assembly (2) according to any one of claims 1 to 9.