CN112524158A

CN112524158A - Shaft sleeve and electronic parking brake caliper

Info

Publication number: CN112524158A
Application number: CN202011491559.0A
Authority: CN
Inventors: 别晓樵; 苗壮; 余振兴; 吴启
Original assignee: Hubei Hangte Technology Co ltd
Current assignee: Hubei Hangte Technology Co ltd
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2021-03-19

Abstract

The invention relates to the technical field of parking braking, in particular to a shaft sleeve and an electronic parking brake caliper. The shaft sleeve comprises a plastic sleeve body and a solid lubricating grease layer; wherein, the solid lubricating grease layer is continuously arranged on the inner circumferential surface of the plastic sleeve body around the central axis of the plastic sleeve body. When the shaft sleeve is used for an electronic parking brake caliper, the shaft sleeve is connected with a brake caliper body and is in running fit with the screw. In the process that the screw rotates relative to the shaft sleeve, the solid lubricating grease layer is positioned between the matching surfaces of the screw and the shaft sleeve, so that in the rotating process, the matching surfaces of the shaft sleeve and the screw can be lubricated, the friction coefficient between the matching surfaces of the screw and the shaft sleeve can be reduced, the abrasion loss can be reduced, the O-shaped ring of the screw can be protected, and the problems of abrasion, sealing failure and the like of the O-shaped ring of the screw can be avoided; therefore, the electronic parking brake caliper using the shaft sleeve can avoid the problems of abnormal sound, parking and service brake failure caused by abrasion, corrosion, oil leakage and the like.

Description

Shaft sleeve and electronic parking brake caliper

Technical Field

The invention relates to the technical field of parking braking, in particular to a shaft sleeve and an electronic parking brake caliper.

Background

At present, after a screw rod in the electronic parking brake caliper rotates for a long time, the screw rod is abraded due to the matching of the screw rod and a metal sleeve, and the problems of abnormal abrasion, sealing failure and the like of an O-shaped ring of the screw rod due to metal powder falling off from the friction of the screw rod and the metal sleeve can be caused, so that the problems of abnormal sound, parking failure and service brake failure of the electronic parking brake caliper can be caused finally.

Disclosure of Invention

The invention aims to provide a shaft sleeve which can reduce the abrasion loss between the surface of the shaft sleeve and a matching surface of a screw rod so as to protect a screw rod O-shaped ring and further avoid the problems of abrasion, sealing failure and the like of the screw rod O-shaped ring, so that the problems of abnormal sound, parking and service brake failure caused by abrasion, corrosion, oil leakage and the like of an electronic parking brake caliper can be avoided.

Embodiments of the invention may be implemented as follows:

in a first aspect, an embodiment of the present invention provides a shaft sleeve for an electronic parking brake caliper, which includes a plastic sleeve body and a solid grease layer;

the solid lubricating grease layer is continuously arranged on the inner circumferential surface of the plastic sleeve body around the central axis of the plastic sleeve body.

In one embodiment of the invention, the plastic sleeve body comprises a plastic base body and a strength fiber layer coated on the outer peripheral surface of the plastic base body;

the solid lubricating grease layer is coated on the inner circumferential surface of the plastic substrate.

In one embodiment of the invention, the plastic sleeve body comprises a plastic base body and a strength fiber layer coated on the inner circumferential surface of the plastic base body;

the solid lubricating grease layer is coated on the inner circumferential surface of the strength fiber layer.

In one embodiment of the invention, the plastic sheath comprises a plastic matrix and a plurality of strength fiber ribs;

the plurality of strength fiber ribs are arranged on the outer circumferential surface of the plastic matrix in a staggered mode, and the solid lubricating grease layer covers the inner circumferential surface of the plastic matrix.

the plurality of strength fiber ribs are arranged on the inner circumferential surface of the plastic base body in a staggered mode, and the solid lubricating grease layer covers the inner circumferential surface of the plastic base body.

In one embodiment of the invention, the bushing further comprises an annular abutment for abutment with the caliper body; the annular butt joint platform is arranged on the plastic sleeve body in a protruding mode along the radial direction of the plastic sleeve body, and the central axis of the annular butt joint platform coincides with the central axis of the plastic sleeve body.

In one embodiment of the invention, the annular abutment platforms are located at the ends of the plastic sheath body in the direction of the central axis of the plastic sheath body.

In a second aspect, an embodiment of the present invention further provides an electronic parking brake caliper, where the electronic parking brake caliper includes a brake caliper body, an MGU assembly spline, a screw, a threaded sleeve, a piston, a brake pad, and the aforementioned bushing;

the MGU component spline, the screw, the threaded sleeve, the piston, the brake pad and the shaft sleeve are all positioned in the brake caliper body; the shaft sleeve is abutted against the brake caliper body, and the screw rod is rotatably connected with the shaft sleeve; the screw sleeve is in threaded connection with the screw rod and is abutted against the piston; the piston is abutted with the brake pad;

the MGU component spline is connected with the screw rod and used for driving the screw rod to rotate relative to the shaft sleeve so as to drive the screw sleeve to move along the axial direction of the screw rod, and therefore the piston and the brake pad are pushed to move.

In one embodiment of the invention, the bushing is a clearance fit with the screw.

In one embodiment of the invention, the brake caliper body is provided with a mounting hole for mounting the shaft sleeve;

the shaft sleeve is in interference fit with the mounting hole.

The shaft sleeve and the electronic parking brake caliper have the advantages that:

the shaft sleeve comprises a plastic sleeve body and a solid lubricating grease layer; wherein, the solid lubricating grease layer is continuously arranged on the inner circumferential surface of the plastic sleeve body around the central axis of the plastic sleeve body. When the shaft sleeve is used for an electronic parking brake caliper, the shaft sleeve is connected with a brake caliper body and is in running fit with the screw. In the process that the screw rotates relative to the shaft sleeve, the solid lubricating grease layer is positioned between the matching surfaces of the screw and the shaft sleeve, so that in the rotating process, the matching surfaces of the shaft sleeve and the screw can be lubricated, the friction coefficient between the matching surfaces of the screw and the shaft sleeve can be reduced, the abrasion loss can be reduced, the O-shaped ring of the screw can be protected, and the problems of abrasion, sealing failure and the like of the O-shaped ring of the screw can be avoided; in addition, the plastic sleeve body of the shaft sleeve can not be corroded in a humid environment and can absorb the rotation vibration of the screw, so that the electronic parking brake caliper using the shaft sleeve can avoid the problems of abnormal sound, parking and service brake failure caused by abrasion, corrosion, oil leakage and the like.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural diagram of an electronic parking brake caliper according to an embodiment of the present invention;

FIG. 2 is a partial schematic view of an electronic parking brake caliper according to an embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating a first view according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a second viewing angle in an embodiment of the invention.

Icon: 100-shaft sleeve; 111-plastic sheath body; 112-solid lubricating grease layer; 113-a plastic substrate; 114-a strength fiber layer; 115-annular abutment table; 200-electronic parking brake caliper; 211-brake caliper body; 212-MGU assembly splines; 213-screw rod; 214-thread insert; 215-a piston; 216-brake pad; 217-screw O-ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.

Referring to fig. 1 to 4, fig. 1 and 2 show a structure of an electric parking brake caliper according to an embodiment of the present invention, and fig. 3 and 4 show a structure of a bushing according to an embodiment of the present invention; the present embodiment provides an electronic parking brake caliper 200, the electronic parking brake caliper 200 includes a brake caliper body 211, an MGU assembly spline 212, a screw 213, a threaded sleeve 214, a piston 215, a brake pad 216, and a boss 100;

the shaft sleeve 100 comprises a plastic sleeve body 111 and a solid lubricating grease layer 112, wherein the solid lubricating grease layer 112 is continuously arranged on the inner circumferential surface of the plastic sleeve body 111 around the central axis of the plastic sleeve body 111;

the MGU component spline 212, the screw rod 213, the threaded sleeve 214, the piston 215, the brake disc 216 and the shaft sleeve 100 are all positioned in the brake caliper body 211; the shaft sleeve 100 is abutted with the brake caliper body 211, and the screw rod 213 is rotatably connected with the shaft sleeve 100; the screw sleeve 214 is in threaded connection with the screw rod 213 and abuts against the piston 215; the piston 215 abuts against the brake pad 216;

MGU assembly spline 212 is connected to screw 213 and is used to drive screw 213 to rotate relative to bushing 100, so as to drive screw 214 to move along the axial direction of screw 213, thereby pushing piston 215 and brake pad 216 to move, so as to complete the clamping action of the parking brake.

Referring to fig. 1 to 4, the electronic parking brake caliper 200 operates according to the following principle:

in the use process of the electronic parking brake caliper 200, the screw 213 rotates relative to the bushing 100 under the driving action of the MGU assembly spline 212, so as to drive the screw 214 to move along the axial direction of the screw 213, thereby pushing the piston 215 and the brake pad 216 to move, so as to complete the clamping action of the parking brake.

In the process of operation, since the shaft sleeve 100 comprises the plastic sleeve body 111 and the solid lubricating grease layer 112; the solid grease layer 112 is continuously disposed on the inner circumferential surface of the plastic sheath 111 around the central axis of the plastic sheath 111. When used in electric parking brake caliper 200, sleeve 100 is connected to caliper body 211 and is rotatably engaged with screw 213. In the process that the screw rod 213 rotates relative to the shaft sleeve 100, the solid lubricating grease layer 112 is positioned between the matching surfaces of the screw rod 213 and the shaft sleeve 100, so that in the rotating process, the matching surfaces of the shaft sleeve 100 and the screw rod 213 can be lubricated, the friction coefficient between the matching surfaces of the screw rod 213 and the shaft sleeve 100 can be reduced, the abrasion loss can be reduced, the screw rod O-shaped ring 217 can be protected, and the problems of abrasion, sealing failure and the like of the screw rod O-shaped ring 217 can be avoided; in addition, the plastic sleeve 111 of the bushing 100 is not corroded in a humid environment and can absorb the rotational vibration of the screw 213, so that the electronic parking brake caliper 200 using the bushing 100 can avoid the problems of abnormal sound, parking and service brake failure caused by abrasion, corrosion, oil leakage and the like.

It should be noted that, firstly, through the arrangement of the solid lubricating grease layer 112, in the process of the rotation of the screw 213 relative to the shaft sleeve 100, the rotating matching surface thereof can play a role of lubrication, so that the shaft sleeve 100 can realize low friction with the screw 213, and can play a role of self-lubrication, and furthermore, lubricating oil does not need to be injected in the use process, thereby reducing the use cost and the difficulty of maintenance. Secondly, the shaft sleeve 100 formed by combining the plastic sleeve body 111 and the solid lubricating grease layer 112 has low manufacturing cost, and is corrosion-resistant, dirt-resistant and oil-resistant; in addition, the plastic housing 111 is manufactured in such a manner that the molding accuracy of the bushing 100 is improved, and the vibration absorption performance and the low friction performance of the bushing 100 are improved, thereby improving the operational reliability of the electronic parking brake caliper 200.

Further, referring to fig. 3 and 4, in the present embodiment, when the solid grease layer 112 is disposed on the inner circumferential surface of the sleeve 100, the solid grease layer 112 is continuously disposed on the inner circumferential surface of the plastic sleeve body 111 around the central axis of the plastic sleeve body 111, so that the solid grease layer 112 is an annular surface disposed on the inner circumferential surface of the plastic sleeve body 111 and adapted to the inner circumferential surface profile of the plastic sleeve body 111.

When the shaft sleeve 100 is installed, the shaft sleeve 100 is in clearance fit with the screw rod 213; and the brake caliper body 211 is provided with a mounting hole for mounting the shaft sleeve 100, and the shaft sleeve 100 is in interference fit with the mounting hole. The shaft sleeve 100 further comprises an annular abutting table 115 for abutting against the caliper body 211, and the annular abutting table 115 is located at the end of the plastic sleeve body 111 along the central axis direction of the plastic sleeve body 111; the annular abutting table 115 is arranged on the plastic sleeve body 111 in a protruding mode along the radial direction of the plastic sleeve body 111, and the central axis of the annular abutting table 115 is overlapped with the central axis of the plastic sleeve body 111.

Further, referring to fig. 3 and 4, in the present embodiment, when the shaft sleeve 100 is disposed, in order to increase the strength and rigidity of the shaft sleeve 100, prevent the shaft sleeve 100 from being deformed due to overload during use, and ensure the forming accuracy of the shaft sleeve 100, the plastic sleeve 111 includes a plastic base 113 and a strength fiber layer 114 covering the outer circumferential surface of the plastic base 113; the solid grease layer 112 covers the inner circumferential surface of the plastic base 113.

In other embodiments of the present invention, the plastic sheath 111 may further include a plastic substrate 113 and a strength fiber layer 114 covering the inner circumferential surface of the plastic substrate 113; the solid lubricating grease layer 112 covers the inner peripheral surface of the strength fiber layer 114.

In other embodiments of the present invention, the plastic sheath 111 may further include a plastic substrate 113 and a plurality of strength fiber ribs; the plurality of strength fiber ribs are alternately provided on the outer circumferential surface of the plastic base 113, and the solid grease layer 112 covers the inner circumferential surface of the plastic base 113.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A shaft sleeve for an electronic parking brake caliper, characterized in that:

the shaft sleeve comprises a plastic sleeve body and a solid lubricating grease layer;

2. Bushing according to claim 1, characterized in that:

the plastic sleeve body comprises a plastic base body and a strength fiber layer coated on the peripheral surface of the plastic base body;

3. Bushing according to claim 1, characterized in that:

the plastic sleeve body comprises a plastic base body and a strength fiber layer coated on the inner circumferential surface of the plastic base body;

4. Bushing according to claim 1, characterized in that:

the plastic sleeve body comprises a plastic base body and a plurality of strength fiber ribs;

the plurality of strength fiber ribs are arranged on the outer circumferential surface of the plastic base body in a staggered mode, and the solid lubricating grease layer covers the inner circumferential surface of the plastic base body.

5. Bushing according to claim 1, characterized in that:

6. Bushing according to any one of claims 1-5, wherein:

the shaft sleeve further comprises an annular abutting table used for abutting against the brake caliper body; the annular abutting table is arranged on the plastic sleeve body in a protruding mode along the radial direction of the plastic sleeve body, and the central axis of the annular abutting table is overlapped with the central axis of the plastic sleeve body.

7. Bushing according to claim 6, characterized in that:

along the central axis direction of the plastic sleeve body, the annular abutting table is positioned at the end part of the plastic sleeve body.

8. An electronic parking brake caliper, characterized by:

the electronic parking brake caliper comprises a brake caliper body, an MGU assembly spline, a screw, a threaded sleeve, a piston, a brake pad and a shaft sleeve according to any one of claims 1-7;

the MGU component spline, the screw rod, the thread sleeve, the piston, the brake pad and the shaft sleeve are all positioned in a brake caliper body; the shaft sleeve is abutted against the brake caliper body, and the screw is rotatably connected with the shaft sleeve; the screw sleeve is in threaded connection with the screw rod and is abutted against the piston; the piston abuts the brake pad;

the MGU component is connected with the screw rod through a spline and used for driving the screw rod to rotate relative to the shaft sleeve so as to drive the screw sleeve to move along the axial direction of the screw rod, and therefore the piston and the brake block are pushed to move.

9. An electronic parking brake caliper according to claim 8, wherein:

the shaft sleeve is in clearance fit with the screw rod.

10. An electronic parking brake caliper according to claim 8, wherein:

the brake caliper body is provided with a mounting hole for mounting the shaft sleeve;

the shaft sleeve is in interference fit with the mounting hole.