阅读说明：本技术 一种分级式鼓式制动器 (Hierarchical formula drum brake ) 是由 何水龙 许恩永 王衍学 于 2020-04-08 设计创作，主要内容包括：本发明公开了一种分级式鼓式制动器,包括制动单元,包括制动鼓、与所述制动鼓抵触的制动蹄、支撑所述制动蹄的支撑轴,所述制动蹄分为第一制动蹄、第二制动蹄；分级单元,包括设置在所述支撑轴上的第一轴套、与所述第一轴套同轴设置的第二轴套,所述第一轴套通过第一连杆与所述第一制动蹄连接,所述第二轴套通过第二连杆与相对应的所述第二制动蹄连接；所述第一制动蹄与所述第二制动蹄结构相同；驾驶员在驾驶车辆时壳根据不同情况对车辆采取不同的制动措施,比如缓慢减速、制动驻车等操作,制动效果循序渐进,不会出现车辆抱死的情况,提高了驾驶体验和车辆平顺性。(The invention discloses a hierarchical drum brake, which comprises a brake unit, a brake drum, brake shoes and a support shaft, wherein the brake shoes are abutted against the brake drum, the support shaft supports the brake shoes, and the brake shoes are divided into a first brake shoe and a second brake shoe; the grading unit comprises a first shaft sleeve arranged on the supporting shaft and a second shaft sleeve coaxially arranged with the first shaft sleeve, the first shaft sleeve is connected with the first brake shoe through a first connecting rod, and the second shaft sleeve is connected with the corresponding second brake shoe through a second connecting rod; the first brake shoe and the second brake shoe are identical in structure; the driver shell takes different braking measures to the vehicle according to different conditions when driving the vehicle, for example slow speed reduction, operation such as braking parking, the braking effect is gradual, the condition of vehicle locking can not appear, has improved driving experience and vehicle ride comfort.)

1. A hierarchical drum brake characterized by: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

the brake unit (100) comprises a brake drum (101), brake shoes (102) abutted against the brake drum (101) and a support shaft (103) supporting the brake shoes (102), wherein the brake shoes (102) are divided into a first brake shoe (A) and a second brake shoe (B);

the grading unit (200) comprises a first shaft sleeve (201) arranged on the supporting shaft (103) and a second shaft sleeve (202) coaxially arranged with the first shaft sleeve (201), the first shaft sleeve (201) is connected with the first brake shoe (A) through a first connecting rod (203), and the second shaft sleeve (202) is connected with the corresponding second brake shoe (B) through a second connecting rod (204);

the first brake shoe (A) and the second brake shoe (B) are identical in structure.

2. The stepped drum brake of claim 1, wherein: the support shaft (103) comprises a support plate (103a), and the brake shoes (102) are uniformly arranged on the support plate (103 a); the supporting disc (103a) is circumferentially provided with a mounting hole (103a-1), one end of the brake shoe (102) is provided with a rotating pin (102a), and the brake shoe (102) is mounted in the mounting hole (103a-1) through the rotating pin (102 a).

3. The stepped drum brake of claim 2, wherein: the first bushing (201) comprises a first hinged end (201a), a first notch (201b), the second bushing (202) comprises a second hinged end (202a), a second notch (202b), the first hinged end (201a) is embedded in the second notch (202b), the second hinged end (202a) is embedded in the first notch (201b), and the width of the second notch (202b) is greater than the width of the first hinged end (201 a).

4. The stepped drum brake of claim 3, wherein: the brake shoe (102) further comprises a friction surface (102b) and a connecting hole (102c), the friction surface (102b) is arc-shaped, and the diameter of the friction surface (102b) is consistent with that of the inner wall of the brake drum (101); the connecting hole (102c) is located on the inner side of the brake shoe (102), the first connecting rod (203) is connected with the connecting hole (102c) of the first brake shoe (A) and the first hinged end (201a), and the second connecting rod (204) is connected with the connecting hole (102c) of the second brake shoe (B) and the second hinged end (202 a).

5. The stepped drum brake of claim 4, wherein: the first connecting rod (203) comprises a shell (203a), a sliding shaft (203b) and an elastic piece (203c) positioned between the shell (203a) and the sliding shaft (203b), one end of the elastic piece (203c) is abutted against the shell (203a), and the other end of the elastic piece (203c) is abutted against the sliding shaft (203 b); the first link (203) varies by no more than the length of the second link (204).

6. The stepped drum brake of claim 5, wherein: the brake unit (100) further comprises a reset pin (104) and a reset spring (105), the reset pin (104) is arranged in the reset hole (103a-2), one end of the reset spring (105) is connected with the reset pin (104), and the other end of the reset spring is connected with the brake shoe (102).

7. The stepped drum brake of claim 6, wherein: the brake drum (101) comprises a limiting end (101a), a first bearing (106) is arranged in the limiting end (101a), and one end of the supporting shaft (103) abuts against the limiting end (101a) through the first bearing (106).

8. The stepped drum brake of claim 7, wherein: the first shaft sleeve (201) comprises a transmission end (201c), a second bearing (107) is arranged between the transmission end (201c) and the supporting shaft (103), and the transmission end (201c) is connected with a brake pedal.

9. The stepped drum brake according to any one of claims 6 to 8, wherein: the grading unit (200) further comprises a limiting disc (205), the brake shoe (102) is arranged between the limiting disc (205) and the supporting disc (103a), the limiting disc (205) further comprises a reset pin hole (205a), one end of the reset pin (104) is fixed in the reset pin hole (205a), and the other end of the reset pin is fixed in the reset hole (103 a-2).

10. The stepped drum brake of claim 9, wherein: the brake unit (100) further comprises a hub (108), the brake drum (101) is located in the hub (108) and is coaxially arranged, and the hub (108) is connected with the brake drum (101) through bolts.

Technical Field

The invention relates to the field of truck braking, in particular to a hierarchical drum brake.

Background

A vehicle brake system refers to a series of special devices that apply a certain force to certain parts of the vehicle (mainly the wheels) so as to apply a certain degree of forced braking thereto. The braking system has the following functions: the running automobile is forced to decelerate or even stop according to the requirement of a driver; stably parking a stopped vehicle under various road conditions (including on a slope); the speed of the vehicle running on the downhill is kept stable; the drum brake is characterized in that a brake transmission mechanism is utilized to enable a brake shoe to press a brake friction plate on the inner side of a brake drum, so that braking force is generated, wheels are decelerated or stopped within the shortest distance according to requirements, driving safety is guaranteed, and the automobile is reliably parked and cannot automatically slide; the drum brake obtains braking force by pressing a brake drum with brake shoes, and can be divided into an inner expanding type and an outer bundling type. The internal expanding drum brake is widely used on modern automobiles by taking an inner cylindrical surface of a brake drum as a working surface; the external beam drum brake takes the outer cylindrical surface of a brake drum as a working surface and is only used as a parking brake of a few automobiles at present; when a driver decelerates and brakes or slowly brakes, the braking effect of the existing drum brake cannot be gradual, and the driving experience is influenced by the conditions that the vehicle shakes, is locked and the like.

Disclosure of Invention

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments, and in this section as well as in the abstract and the title of the invention of this application some simplifications or omissions may be made to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions are not intended to limit the scope of the invention.

The present invention has been made keeping in mind the above problems occurring in the prior art and/or the problems occurring in the prior art.

Therefore, the technical problem to be solved by the invention is that the vehicle shakes and locks in the braking effect during the braking operation of the driver under the condition of unfamiliarity with the vehicle.

In order to solve the technical problems, the invention provides the following technical scheme: a stepped drum brake comprises a brake unit and a brake unit, wherein the brake unit comprises a brake drum, brake shoes and a support shaft, the brake shoes are abutted against the brake drum, the support shaft supports the brake shoes, and the brake shoes are divided into a first brake shoe and a second brake shoe; the grading unit comprises a first shaft sleeve arranged on the supporting shaft and a second shaft sleeve coaxially arranged with the first shaft sleeve, the first shaft sleeve is connected with the first brake shoe through a first connecting rod, and the second shaft sleeve is connected with the corresponding second brake shoe through a second connecting rod; the first brake shoe and the second brake shoe are identical in structure.

As a preferable aspect of the stepped drum brake of the present invention, wherein: the support shaft comprises a support plate, and the brake shoes are uniformly arranged on the support plate; the supporting disc is provided with mounting holes along the circumference, one end of the brake shoe is provided with a rotating pin, and the brake shoe is mounted in the mounting holes through the rotating pin.

As a preferable aspect of the stepped drum brake of the present invention, wherein: the first shaft sleeve comprises a first hinged end and a first notch, the second shaft sleeve comprises a second hinged end and a second notch, the first hinged end is embedded in the second notch, the second hinged end is embedded in the first notch, and the width of the second notch is larger than that of the first hinged end.

As a preferable aspect of the stepped drum brake of the present invention, wherein: the brake shoe further comprises a friction surface and a connecting hole, the friction surface is arc-shaped, and the diameter of the friction surface is consistent with the diameter of the inner wall of the brake drum; the connecting hole is located on the inner side of the brake shoe, the first connecting rod is connected with the connecting hole of the first brake shoe and the first hinged end, and the second connecting rod is connected with the connecting hole of the second brake shoe and the second hinged end.

As a preferable aspect of the stepped drum brake of the present invention, wherein: the first connecting rod comprises a shell, a sliding shaft and an elastic piece positioned between the shell and the sliding shaft, one end of the elastic piece is abutted against the shell, and the other end of the elastic piece is abutted against the sliding shaft; the variable length of the first connecting rod is not greater than the length of the second connecting rod.

As a preferable aspect of the stepped drum brake of the present invention, wherein: the supporting plate further comprises a reset hole, the brake unit further comprises a reset pin and a reset spring, the reset pin is arranged in the reset hole, one end of the reset spring is connected with the reset pin, and the other end of the reset spring is connected with the brake shoe.

As a preferable aspect of the stepped drum brake of the present invention, wherein: the brake drum comprises a limiting end, a first bearing is arranged in the limiting end, and one end of the supporting shaft abuts against the limiting end through the first bearing.

As a preferable aspect of the stepped drum brake of the present invention, wherein: the first shaft sleeve comprises a transmission end, a second bearing is arranged between the transmission end and the supporting shaft, and the transmission end is connected with the brake pedal.

As a preferable aspect of the stepped drum brake of the present invention, wherein: the grading unit further comprises a limiting disc, the brake shoe is arranged between the limiting disc and the supporting disc, the limiting disc further comprises a reset pin hole, one end of the reset pin is fixed in the reset pin hole, and the other end of the reset pin is fixed in the reset hole.

As a preferable aspect of the stepped drum brake of the present invention, wherein: the brake unit further comprises a hub, the brake drum is located in the hub and coaxially arranged, and the hub is connected with the brake drum through bolts.

The invention has the beneficial effects that: the driver shell takes different braking measures to the vehicle according to different conditions when driving the vehicle, for example slow speed reduction, operation such as braking parking, the braking effect is gradual, the condition of vehicle locking can not appear, has improved driving experience and vehicle ride comfort.

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 description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:

FIG. 1 is a schematic view of an external configuration of a stepped drum brake according to an embodiment of the present invention;

FIG. 2 is a perspective cross-sectional view of a stepped drum brake according to one embodiment of the present invention;

FIG. 3 is a schematic view of a first linkage of a classification unit of a stepped drum brake according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a classification unit of a classification drum brake according to an embodiment of the present invention;

FIG. 5 is a schematic illustration of a braking process in a stepped drum brake according to an embodiment of the present invention;

FIG. 6 is a schematic structural view of a brake shoe of the stepped drum brake according to an embodiment of the present invention;

FIG. 7 is a schematic illustration of an embodiment of a staged drum brake explosion according to the present invention;

fig. 8 is a schematic sectional view of a stepped drum brake according to an embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Next, the present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially according to the general scale for convenience of illustration when describing the embodiments of the present invention, and the drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.

Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.