CN113028051B

CN113028051B - Hydraulically driven parking mechanism, brake caliper and vehicle

Info

Publication number: CN113028051B
Application number: CN201911253428.6A
Authority: CN
Inventors: 李守泽; 朱晓军; 张鹏; 郭海
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2023-03-24
Anticipated expiration: 2039-12-09
Also published as: CN113028051A

Abstract

The invention discloses a hydraulically driven parking mechanism, a brake caliper and a vehicle, wherein the hydraulically driven parking mechanism comprises: the fixing sleeve is provided with a mounting hole, the side wall of the fixing sleeve is provided with a first sliding part communicated with the mounting hole, one end of the fixing sleeve is provided with an oil inlet, and the other end of the fixing sleeve is provided with parking teeth and unlocking teeth; the parking piston is provided with a second sliding part, the parking piston is inserted into the mounting hole, the second sliding part is in sliding fit with the first sliding part in the axial direction, and one end of the parking piston is provided with a guide tooth; the rotating shaft is provided with an inserting convex part, and when parking braking is carried out, the inserting convex part slides out of the first sliding part, is driven by the guide teeth to rotate and rotates to the parking teeth and is abutted against the unlocking teeth; when the brake is released, the inserting convex part slides into the first sliding part through the unlocking tooth. The parking mechanism has a simple structure, light weight and low cost by using a service hydraulic braking system to provide power to complete parking.

Description

Hydraulically driven parking mechanism, brake caliper and vehicle

Technical Field

The invention relates to the technical field of vehicles, in particular to a hydraulically-driven parking mechanism, a brake caliper and a vehicle.

Background

With the continuous development of society, automobiles become an indispensable part of people's lives gradually. As a key component of a vehicle system, an electronic parking system has become important to improve.

In the related art, a conventional electronic parking system uses a motor as a main power source for parking, and a parking brake or a parking release can be realized by outputting a torque through the motor. Such an electronic parking system requires a motor assembly or a transmission mechanism such as a planetary gear, which results in a complicated structure, a large volume and weight, and an increase in cost.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a hydraulically driven parking mechanism, which can be used to complete the parking action by using the service hydraulic braking system to provide power, and has the advantages of simple structure, light weight and low cost.

The invention also provides a brake caliper with the hydraulically-driven parking mechanism.

The invention also provides a vehicle with the brake caliper.

According to an embodiment of the first aspect of the present invention, a hydraulically driven parking mechanism comprises: the fixing sleeve is provided with a mounting hole, the side wall of the fixing sleeve is provided with a first sliding part communicated with the mounting hole, one end of the fixing sleeve is provided with an oil inlet communicated with the mounting hole, and the other end of the fixing sleeve is provided with a parking tooth and an unlocking tooth; the parking piston is provided with a second sliding part, the parking piston is inserted into the mounting hole, the second sliding part is in sliding fit with the first sliding part in the axial direction, and one end of the parking piston is provided with a guide tooth; the end, facing the fixed sleeve, of the rotating shaft is provided with an inserting convex part in sliding fit with the first sliding part, the end face of the inserting convex part is suitable for being matched with the guide tooth, the parking tooth and the unlocking tooth respectively, and the inserting convex part is driven by the guide tooth to rotate and rotate to the parking tooth and is abutted against the unlocking tooth after sliding out of the first sliding part during parking braking; when the brake is released, the inserting convex part slides into the first sliding part through the unlocking teeth, the second sliding part is a plurality of convex keys formed on the side wall of the parking piston, the first sliding part is a sliding groove, and one end, facing the oil inlet, of the sliding groove is closed.

According to the pressure-driven parking mechanism provided by the embodiment of the invention, the hydraulic brake system is used for providing power, two states of parking and parking releasing of a vehicle can be realized, the structure of the parking mechanism is simple and reliable, the weight is light, the cost is low, and the energy-saving effect of the vehicle can be realized.

According to some embodiments of the present invention, the sliding groove includes a through sliding groove penetrating through a side wall of the fixing sleeve and a blind sliding groove formed on an inner wall of the mounting hole, the plurality of the convex keys are respectively fitted in one of the through sliding groove and the blind sliding groove in a one-to-one correspondence, and the insertion convex portion is fitted to only the through sliding groove.

According to some embodiments of the present invention, a parking tooth and an unlocking tooth are disposed between two adjacent through sliding grooves, and the unlocking tooth is disposed adjacent to and protruding from the parking tooth.

According to some embodiments of the present invention, a plurality of said protruding keys are uniformly distributed along a circumferential direction of said parking piston, each of said sliding grooves extends along an axial direction of said retainer bushing and a plurality of said sliding grooves are uniformly distributed along a circumferential direction of said retainer bushing, and said through sliding grooves and said blind sliding grooves are distributed in a staggered manner.

According to some embodiments of the invention, the guide tooth is pointed and has a first beveled flank and a second beveled flank constituting a point, the spigot-boss being adapted to fit with the first beveled flank and to be spaced apart from the second beveled flank.

According to some embodiments of the invention, the end face of the male plug-in part has a turning bevel, the parking tooth has a first sliding face, the unlocking tooth comprises a second sliding face and a stop face, the stop face connects the first sliding face and the second sliding face, the stop face is adapted to abut against a side face of the male plug-in part, and the turning bevel, the first beveled tooth face of the guide tooth, the first sliding face and the second sliding face are inclined at the same angle.

According to some embodiments of the invention, a first end of the first sliding surface communicates with the sliding groove and a second end intersects the stop surface, the first sliding surface being inclined from the first end to the second end toward an end near the oil inlet.

According to some embodiments of the invention, the end of the fixing sleeve opposite the guide tooth is open and forms a cavity.

A brake caliper according to an embodiment of the second aspect of the present invention includes the parking mechanism according to the above-described embodiment of the first aspect of the present invention.

A vehicle according to an embodiment of the third aspect of the invention comprises a brake caliper according to an embodiment of the second aspect of the invention described above.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of a hydraulically actuated parking mechanism according to an embodiment of the present invention;

FIG. 2 is a schematic view of a parking piston and a rotating shaft according to an embodiment of the present invention;

FIG. 3 is a schematic view of a driving state of a hydraulically actuated parking mechanism according to an embodiment of the present invention;

FIG. 4 is a state diagram illustrating a parking process of a hydraulically actuated parking mechanism according to an embodiment of the present invention;

FIG. 5 is a schematic illustration of a park complete state of a hydraulically actuated park mechanism according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of a hydraulically actuated parking mechanism according to an embodiment of the present invention.

Fig. 7 is a schematic view of a harness according to an embodiment of the invention.

Reference numerals:

a parking mechanism 100;

a fixed sleeve 10; a mounting hole 11; a first slide portion 12; a through chute 121; a blind runner 122; an oil inlet 13; a parking tooth 14; a first sliding surface 141; an unlocking tooth 15; a second sliding surface 151; a stop surface 152;

a parking piston 20; a second slide portion 21; a convex key 211; the guide teeth 22; a first beveled tooth surface 221; a second beveled tooth surface 222;

a rotating shaft 30; an insertion convex portion 31; a steering ramp 311;

a chamber 40.

Detailed Description

Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.

A hydraulically actuated parking mechanism 100 according to an embodiment of the present invention is described below with reference to fig. 1-7.

As shown in fig. 1 to 7, a hydraulically driven parking mechanism 100 according to an embodiment of the first aspect of the present invention includes a fixed sleeve 10, a parking piston 20, and a rotating shaft 30.

Specifically, the fixing sleeve 10 has a mounting hole 11, a side wall of the fixing sleeve 10 has a first sliding portion 12 communicating with the mounting hole 11, one end of the fixing sleeve 10 has an oil inlet 13 communicating with the mounting hole 11, and the other end has parking teeth 14 and unlocking teeth 15. The parking piston 20 has a second sliding portion 21, the parking piston 20 is inserted into the through hole, and the second sliding portion 21 is slidably fitted with the first sliding portion 12 in the axial direction, and one end of the parking piston 20 has a guide tooth 22. The end of the rotating shaft 30 facing the fixed sleeve 10 is provided with an insertion convex part 31 in sliding fit with the first sliding part 12, the end surface of the insertion convex part 31 is adapted to be respectively matched with the guide tooth 22, the parking tooth 14 and the unlocking tooth 15, and during parking braking, after the insertion convex part 31 slides out of the first sliding part 12, the insertion convex part is driven by the guide tooth 22 to rotate to the parking tooth 14 and is abutted against the unlocking tooth 15. When the brake is released, the insertion projection 31 slides into the first sliding portion 12 via the unlocking tooth 15.

One of the ends of the fixing sleeve 10 has an oil inlet hole (e.g., the right-side end of fig. 1) through which brake fluid can enter the parking mechanism to power the parking mechanism. The parking piston 20 may protrude into the mounting hole 11 from the other end of the fixing sleeve 10, and the parking piston 20 is coaxially assembled with the fixing sleeve 10. The second sliding portions 21 are uniformly distributed on the outer circumferential wall of the parking piston 20 and protrude radially outward. The rotation shaft 30 is provided with an insertion protrusion 31 extending toward the pouch 10, and the insertion protrusion 31 and the second sliding portion 21 can slide into or out of the first sliding portion 12. The parking tooth 14 is formed at one end (e.g., the left end in fig. 1) of the stationary cover 10, and the parking tooth 14 can abut against the insertion projection 31 when the vehicle is stopped.

According to the hydraulically-driven parking mechanism 100 provided by the embodiment of the invention, by adopting the fixed sleeve 10, the parking piston 20 and the rotating shaft 30, brake fluid can enter the parking mechanism 100 through the oil inlet 13, parking braking or parking releasing can be realized by using power provided by a driving hydraulic braking system, a motor can be used as a source of parking power instead, structures such as a motor assembly and a planetary gear can be omitted, so that the parking mechanism 100 is simple in structure, light in weight and low in cost, and a vehicle adopting the parking mechanism 100 can save more energy.

Specifically, the second sliding portion 21 is a plurality of convex keys 211 formed on a side wall of the parking piston 20, the first sliding portion 12 is a sliding groove, one end of the sliding groove facing the oil inlet 13 is closed, the sliding groove includes a through sliding groove 121 penetrating through a side wall of the fixing sleeve 10 and a blind sliding groove 122 formed on an inner wall of the mounting hole 11, the plurality of convex keys 211 are respectively fitted in one of the through sliding groove 121 and the blind sliding groove 122 in a one-to-one correspondence manner, and the insertion convex portion 31 is only fitted in the through sliding groove 121. The key, the guide tooth 22 and the insertion projection 31 are slidable in the first sliding portion 12, and the guide tooth 22 and the insertion projection 31 are slidable in or out of the first sliding portion 12. Each through sliding groove 121 or the blind sliding groove 122 is internally provided with a convex key 211 correspondingly, so that the parking piston 20 can be effectively limited, and the parking piston 20 is prevented from rotating during parking action and parking releasing action.

According to some alternative embodiments of the present invention, a parking tooth 14 and an unlocking tooth 15 are disposed between two adjacent through chutes 121, and the unlocking tooth 15 is disposed adjacent to the parking tooth 14 and protruding from the parking tooth 14. The parking teeth 14 and the unlocking teeth 15 are provided on the outer wall of the fixing cover 10, and the parking teeth 14 and the unlocking teeth 15 are located at one end (e.g., the left side in the example of fig. 3) of the fixing cover 10 and can be engaged with the insertion projection 31. The plug-in lug 31 can be stopped by the parking tooth 14 and locked firmly, so that the parking effect of the parking mechanism 100 can be achieved. When the vehicle starts the parking release action, the insertion convex portion 31 may be separated from the parking tooth 14 and slid into the first sliding portion 12 by the unlocking tooth, so that the parking release of the parking mechanism 100 may be completed.

According to some embodiments of the present invention, with reference to fig. 1-5 and 7, the plurality of tabs 211 are uniformly distributed along the circumferential direction of the parking piston 20, each sliding slot extending along the axial direction of the fixed sleeve 10 and the plurality of sliding slots being uniformly distributed along the circumferential direction of the fixed sleeve 10, the through sliding slots 121 being distributed staggered with respect to the blind sliding slots 122. The first sliding portion 12 may be composed of a plurality of blind slide grooves 122 and a plurality of through slide grooves 121, each blind slide groove 122 being spaced apart by one through slide groove 121. In the example of fig. 7, 4 blind slide grooves 122 and through slide grooves 121 are provided, respectively, and the blind slide grooves 122 and through slide grooves 121 are uniformly distributed on the outer circumferential wall of the fixed sleeve 10, respectively. The plurality of convex keys 211 are respectively limited in the blind sliding groove 122 and the through sliding groove 121 in the circumferential direction, so that the parking piston 20 is limited by the convex keys 211 when the vehicle performs a parking action or releases parking, and the rotation of the parking piston 20 can be avoided.

Further, referring to fig. 2, the guide tooth 22 is pointed and has a first inclined tooth face 221 and a second inclined tooth face 222 constituting a pointed angle, and the bayonet boss 31 is adapted to be fitted to the first inclined tooth face 221 and spaced apart from the second inclined tooth face 222. The first and second sloped tooth surfaces 221 and 222 are sloped with respect to the bottom surface of the rotating shaft 30, the parking piston 20 is provided with a plurality of guide teeth 22, and the first and second sloped tooth surfaces 221 and 222 of the plurality of adjacent guide teeth 22 are sequentially connected. As such, the first and second inclined tooth surfaces 221 and 222 of one guide tooth 22 may be formed in a pointed shape. The first angled flank 221 of each guide tooth 22 may intersect the second angled flank 222 of an adjacent guide tooth 22 and may form an inverted point opposite the direction of the point. When the guide tooth 22 is retained in the first sliding portion 12 simultaneously with the key 211, the tip angle formed by the first and second sloped tooth surfaces 221 and 222 is located at the middle position in the width in the circumferential direction of the key 211. The pointed end of the guide tooth 22 is located at one end of the parking piston 20 (for example, the pointed end may be the lower end of fig. 2), and the pointed end of the guide tooth 22 may be in contact-fit with the insertion protrusion 31, so that the first inclined tooth surface 221 may contact the insertion protrusion 31 after the parking action of the vehicle occurs, and the insertion protrusion 31 may stop rotating after being subjected to resistance when one end of the insertion protrusion 31 slides to the inverted pointed shape.

According to some embodiments of the present invention, referring to fig. 3 and 4, the end surface of the plug-in protrusion 31 has a turning slope 311, the parking tooth 14 has a first sliding surface 141, the unlocking tooth 15 includes a second sliding surface 151 and a stop surface 152, the stop surface 152 connects the first sliding surface 141 and the second sliding surface 151, the stop surface 152 is adapted to abut against the side surface of the plug-in protrusion 31, the turning slope 311, the first slope tooth surface 221 of the guide tooth 22, the first sliding surface 141, and the second sliding surface 151 have the same slope angle, so as to reduce the friction force generated by sliding when the plug-in protrusion 31 contacts with each other, and when the plug-in protrusion 31 is stopped at the chamfered end of the guide tooth 22, the first slope tooth surface 221 and the turning slope 311 may be located on the same plane, so that the plug-in protrusion 31 can be stably clamped at the chamfered end. When one end of the insertion convex portion 31 is caught by the stopping surface 152, the steering inclined surface 311 and the first sliding surface 141 may be located on the same plane, so that the insertion convex portion 31 is firmly caught by the parking tooth 14, and the structure of the parking mechanism 100 is stable.

Specifically, with reference to fig. 3 to 5, a first end of the first sliding surface 141 communicates with the sliding groove, and a second end intersects with the stop surface 152, and the first sliding surface 141 is inclined from the first end to the second end toward the end near the oil inlet 13. The arrangement is such that after the insertion convex portion 31 slides out from the first sliding portion 12, the edge of the insertion convex portion 31 is close to the first end of the first sliding surface 141, so as to ensure that the insertion convex portion 31 and the first sliding surface 141 contact each other, and are stopped and stopped by the stopping surface 152. The inclination of the end of the first sliding member 141 facing the oil inlet 13 can reduce the included angle between the first end and the stop surface 152, so that the insertion convex portion 31 is further firmly clamped on the parking tooth 14, and the reliability of the parking mechanism 100 can be further improved.

According to some embodiments of the present invention, the end of the fixing sleeve 10 opposite to the guide teeth 22 is open and forms the cavity 40, so that the cavity 40 can effectively reduce the weight of the parking mechanism 100, and the cost can be reduced.

Referring to fig. 3 to 5, in the vehicle running state, both the second slide portion 21 and the insertion convex portion 31 are defined within the first slide portion 12. When the vehicle starts the parking state, the brake fluid independently controlled by the solenoid valve may enter the parking mechanism 100 from the oil inlet 13, push the parking piston 20 and the rotation shaft 30 to move in a direction away from the fixed sleeve 10 (for example, the left side of fig. 4), and the guide teeth 22 defined in the through slide grooves 121 may push the insertion protrusion 31 to slide out from the first sliding portion 12. After the insertion convex portion 31 slides out of the first sliding portion 12, the insertion convex portion 31 is subjected to a tangential force, so that the rotating shaft 30 and the insertion convex portion 31 rotate, and the convex key 211 is limited in the first sliding portion 12, so that the parking piston 20 can be prevented from rotating. The turning slope 311 of the plugging protrusion 31 and the first slope tooth surface 221 contact each other, and the plugging protrusion 31 can slide on the first slope tooth surface 221 and the first sliding surface 141, and when one end of the turning slope 311 contacts the chamfered end, the plugging protrusion 31 stops after receiving resistance. When the brake fluid is released and the thrust force is reduced, the parking piston 20 starts to slide in the opposite direction, and the insertion convex part 31 can continue to move until the insertion convex part 31 is stopped by the stop surface 152 and is fixedly locked, so that the parking effect of the parking mechanism 100 can be realized.

When the vehicle is parked and released, brake fluid independently controlled by the electromagnetic valve can enter the parking mechanism 100 from the oil inlet 13 to push the parking piston 20 to move in a direction away from the fixed sleeve 10, the guide tooth 22 moves in a direction away from the fixed sleeve 10, after the guide tooth 22 in the blind sliding groove 122 contacts the insertion convex part 31, the sharp-angled end of the guide tooth 22 pushes the insertion convex part 31 away from the parking tooth 14, so that the insertion convex part 31 is circumferentially released from the limit, the steering inclined surface 311 of the insertion convex part 31 can contact with the second sliding surface 151, so that the rotating shaft 30 can start to rotate, when the steering inclined surface 311 completely slides away from the second sliding surface 151, the insertion convex part 31 slides into the first sliding part 12, and at the same time, the insertion convex part 31 and the convex key 211 are simultaneously limited in the first sliding part 12, so that the vehicle parking and releasing action is completed.

A brake caliper according to an embodiment of the second aspect of the present invention includes the parking mechanism 100 according to the embodiment of the second aspect of the present invention described above.

A vehicle according to an embodiment of the third aspect of the invention includes a brake caliper according to the embodiment of the third aspect of the invention described above.

Other components of a vehicle according to embodiments of the present invention, such as the engine and wheels and operation, are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

In the description of the present invention, "a plurality" means two or more.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A hydraulically actuated parking mechanism, comprising:

the fixing sleeve is provided with a mounting hole, the side wall of the fixing sleeve is provided with a first sliding part communicated with the mounting hole, one end of the fixing sleeve is provided with an oil inlet communicated with the mounting hole, and the other end of the fixing sleeve is provided with a parking tooth and an unlocking tooth;

the parking piston is provided with a second sliding part, the parking piston is inserted into the mounting hole, the second sliding part is in sliding fit with the first sliding part in the axial direction, one end of the parking piston is provided with a plurality of guide teeth, the guide teeth are in a sharp angle shape and are provided with a first oblique tooth surface and a second oblique tooth surface which form the sharp angle, and the first oblique tooth surface of each guide tooth is intersected with the second oblique tooth surface of the adjacent guide tooth and forms a reversed sharp angle opposite to the direction of the sharp angle;

the end, facing the fixed sleeve, of the rotating shaft is provided with an inserting convex part in sliding fit with the first sliding part, the end face of the inserting convex part is suitable for being matched with the guide tooth, the parking tooth and the unlocking tooth respectively, the inserting convex part is suitable for being matched with the first oblique tooth surface and spaced from the second oblique tooth surface, and the inserting convex part is driven by the guide tooth to rotate and rotate to the parking tooth and is abutted against the unlocking tooth after sliding out of the first sliding part during parking braking; when braking is relieved, the inserting convex part slides into the first sliding part through the unlocking teeth, the second sliding part is a plurality of convex keys formed on the side wall of the parking piston, the first sliding part is a sliding groove, one end, facing the oil inlet, of the sliding groove is closed, the sliding groove comprises a through sliding groove penetrating through the side wall of the fixing sleeve and a blind sliding groove formed in the inner wall of the mounting hole, the convex keys are correspondingly matched in one of the through sliding groove and the blind sliding groove, and the inserting convex part is only matched with the through sliding groove;

the end face of the inserting convex part is provided with a steering inclined plane, and the inclination angles of the steering inclined plane and the first inclined tooth surface of the guide tooth are consistent.

2. The parking mechanism according to claim 1, wherein a parking tooth and an unlocking tooth are disposed between two adjacent through sliding grooves, and the unlocking tooth is disposed adjacent to and protruding from the parking tooth.

3. The parking mechanism of claim 2 wherein a plurality of said tabs are evenly distributed along a circumference of said parking piston, each of said slots extends along an axial direction of said boot and a plurality of said slots are evenly distributed along a circumference of said boot, said through slots being staggered from said blind slots.

4. The parking mechanism of claim 1 wherein the parking tooth has a first sliding surface and the unlocking tooth includes a second sliding surface and a stop surface connecting the first sliding surface and the second sliding surface, the stop surface being adapted to abut against a side surface of the mating protrusion, the steering ramp, the first beveled tooth surface of the guide tooth, the first sliding surface, and the second sliding surface being inclined at the same angle.

5. The parking mechanism of claim 4 wherein a first end of the first sliding surface communicates with the chute and a second end intersects the stop surface, the first sliding surface sloping from the first end to the second end toward the end proximate the oil inlet.

6. The park mechanism according to claim 3, wherein an end of the harness opposite the guide tooth is open and forms a cavity.

7. Brake calliper, comprising a parking mechanism according to any of claims 1-6.

8. A vehicle characterized by comprising a brake caliper according to claim 7.