CN215567554U - Push rod of full-disc brake - Google Patents

Abstract

The present invention provides a push rod of an all-disc brake for converting a rotational motion of a ramp gear into a linear motion to push a brake disc, the push rod comprising: a main push rod having a base part at one end thereof, the base part having a bearing chamber depressed inward; the bearing is installed in a bearing chamber at the bottom of the main push rod through a pin shaft, and the highest point of the peripheral surface of the bearing protrudes out of the bearing chamber so as to roll on a ramp. According to the push rod provided by the embodiment of the utility model, the bottom of the push rod is supported by the bearing, so that the friction resistance can be further reduced, the power consumption is reduced, and the braking process of the brake is more stable.

Description

Push rod of full-disc brake

Technical Field

The utility model relates to the field of vehicle brakes, in particular to a push rod of an all-disc brake.

Background

The automobile brake is a braking device of an automobile, and the brakes used by the automobile are almost all of friction type and can be divided into drum type and disc type. The rotary element in the drum brake friction pair is a brake drum, and the working surface of the rotary element is a cylindrical surface; the rotating element of the disc brake is then a rotating brake disc, with the end face being the working surface. The disc brake also uses air pressure or hydraulic pressure as a power source, and the main parts include a brake disc, an air chamber mechanism or a hydraulic mechanism, a brake caliper, a friction plate and the like. The rotating element in a disc brake is a metal disc, called a brake disc, which works with end faces. The brake disc is made of cast iron or alloy steel and is fixed to the wheel, and the friction elements clamp the brake disc from both sides to brake as the wheel rotates. Disc brakes can be broadly divided into caliper disc and full disc types.

The disc brake in the prior art brakes more coarsely, the brake disc is a rotating part of the brake and can slide back and forth on the spline shaft, and when the brake is used, the friction plate can stop a vehicle in a short time, so that the whole brake is not smooth. In addition, the transmission device of the brake often simultaneously bears various forces, such as complex combined actions of pressure, bending moment or torque, and the like, so that the braking process is not stable.

SUMMERY OF THE UTILITY MODEL

In view of the above, embodiments of the present invention provide a push rod of an all-disc brake, so as to obviate or mitigate one or more of the disadvantages in the prior art.

The technical scheme of the utility model is as follows:

a push rod of an all-disc brake for converting a rotational motion of a ramp gear into a linear motion to push a brake disc, the push rod comprising: a main push rod having a base part at one end thereof, the base part having a bearing chamber depressed inward; the bearing is installed in a bearing chamber at the bottom of the main push rod through a pin shaft, and the highest point of the peripheral surface of the bearing protrudes out of the bearing chamber so as to roll on a ramp.

Preferably, the base part of the push rod is an arc-shaped supporting seat.

Preferably, the base part is a U-shaped base, two sides of the base part are provided with protruding support seats, the support seats are provided with corresponding through holes, and the pin shaft penetrates through the through holes.

Preferably, one end of the pin shaft, which is far away from the ramp gear, is provided with a side limiting roller, and the side limiting roller is positioned on the outer side of the main push rod.

Preferably, the side limiting idler wheel is installed on the pin shaft through a shaft sleeve, and a shaft shoulder of the pin shaft on the inner side through which the side limiting idler wheel passes and an elastic check ring on the outer side are fixedly installed.

Preferably, the pin shaft is provided with a first pin hole along the radial direction of the pin shaft, the supporting seat on one side of the base part is also provided with a corresponding second pin hole, and the pin shaft is fixedly connected with the base part through pins or elastic rolling sheets arranged in the two pin holes.

Preferably, the side of the non-support base portion has an arcuate recess.

Preferably, the cross section of the base is larger than the cross section of the main push rod, and/or the cross section of the main push rod is a rectangle with one pair of arc-shaped sides.

Preferably, an end of the main push rod opposite to the base portion has an axially arranged hollow.

Preferably, the bearing is a needle bearing.

According to the push rod of the full-disc brake disclosed by the embodiment of the utility model, the obtained beneficial effects at least comprise that:

according to the push rod provided by the embodiment of the utility model, the bottom of the push rod is supported by the bearing, so that the friction resistance can be further reduced, the power consumption is reduced, the brake can exert the maximum efficiency, and the green low-carbon economic requirement is met. The base part of the push rod adopts an arc-shaped supporting structure, so that the bearing capacity of the whole push rod can be improved.

Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

It will be appreciated by those skilled in the art that the objects and advantages that can be achieved with the present invention are not limited to the specific details set forth above, and that these and other objects that can be achieved with the present invention will be more clearly understood from the detailed description that follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the principles of the utility model. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the utility model. For purposes of illustrating and describing some portions of the present invention, corresponding parts of the drawings may be exaggerated, i.e., may be larger, relative to other components in an exemplary apparatus actually manufactured according to the present invention. In the drawings:

fig. 1 is a schematic structural diagram of an all-disc brake in the prior art.

Fig. 2 is an exploded view of the transmission according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a transmission device according to an embodiment of the utility model.

Fig. 4 is a schematic perspective view of a push rod according to an embodiment of the present invention.

Fig. 5 is a schematic front view of a push rod according to an embodiment of the utility model.

Fig. 6 is a schematic side view of a push rod according to an embodiment of the utility model.

Fig. 7 is a sectional view taken along line a-a of fig. 6.

Fig. 8 is a schematic perspective view of a push rod according to an embodiment of the present invention.

FIG. 9 is a perspective view of a cabinet according to one embodiment of the present invention.

Fig. 10 is a partially enlarged view of a portion C in fig. 9.

FIG. 11 is a front view of the cabinet in one embodiment of the utility model.

FIG. 12 is a side view of the enclosure in one embodiment of the utility model.

Fig. 13 is a schematic view of the force analysis of the push rod in the transmission process of the present invention.

Reference numerals:

100. a push rod; 110. a main push rod; 111. a base part; 112. a bearing chamber; 113. a supporting seat; 114. a through hole; 115. an arc-shaped supporting seat; 116. a second pin hole; 117. a hollow part; 120. a bearing; 130. a pin shaft; 131. a shaft shoulder; 132. a first pin hole; 140. a side limiting roller; 141. a shaft sleeve; 142. a circlip;

200. a cabinet housing; 210. an inner annular wall; 220. an outer annular wall; 221. a groove; 222. an enlarging portion; 223. thickening the upper edge; 224. thickening the lower edge; 225. a process platform; 226. a cover plate connecting hole; 227. round corners; 230. a side wall; 240. a cover plate; 241. a limiting hole; 300. a ramp gear; 301. an inner gear ring; 302. a ramp; 400. a gear shaft;

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.

It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.

It is also noted herein that the term "coupled," if not specifically stated, may refer herein to not only a direct connection, but also an indirect connection in which an intermediate is present.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or similar parts, or the same or similar steps.

Fig. 1 is a schematic structural diagram of an all-disc brake in the prior art, which may include a driving device, a transmission device, a brake disc 600, friction plates, a casing, and the like.

Wherein the housing may include the housing 200, the cover plate 240, and the outer cover 700 arranged in the axial direction of the brake disc 600 and relatively fixedly coupled by the coupling member. Wherein the housing 200 is used to mount the transmission, the cover 240 is used to cover the housing 200 and attach the brake to the axle flange, and the outer cover 700 is used to cover the brake disc 600. The housing 200 and the outer cover 700 serve primarily as housings for the brake of the present invention, and the cover 240 is interposed between the housing 200 and the outer cover 700 for enclosing a portion of the actuator within the housing 200 and mounting the brake to the axle flange.

The full-disc brake can be driven by using the air chamber push rod 100 of the existing drum brake and an automatic adjusting mechanism or an electric device as a driving device. The transmission may use the principles of gear transmission and screw transmission to convert circular motion into linear motion of the friction plates, thereby generating a braking torque. The friction plates are disposed on both sides of the brake disc and may include dynamic friction plates 810 and static friction plates 820. The transmission means may include a gear shaft 400, a ramp gear 300, a push rod 100, and the like. The ramp gear 300 is a ring gear with partial internal teeth, and the gear shaft 400 is internally engaged with the ring gear. The outer peripheral surface of the ramp gear 300 is provided with a plurality of spiral ramps 302, the push rod 100 is arranged at the ramps 302, under the limiting action of the limiting holes 241 of the cover plate 240, the push rod 100 moves along a straight line and pushes the thrust frame 500 to be close to the brake disc 600, the dynamic friction plate 810 is pushed to be pressed against one end of the brake disc 600, the brake disc 600 slides in the axial direction of the outer hub in a small displacement mode and is pressed with the friction plates on two sides of the brake disc 600, and therefore braking torque is generated. The full-disc brake applies a ramp 302 force-increasing principle, a spiral slope surface is arranged on the circumferential surface of a ramp gear 300, the rotary motion of the slope surface is converted into linear motion, and multiple force increasing can be realized through the transmission device.

In the full-disc brake, the push rod is pushed by the ramp gear, and due to the spiral structure of the ramp, the push rod can bear certain torque, so that the friction force between the push rod and the cover plate is increased, and the conditions of unstable transmission process, partial power loss and the like are caused.

According to one aspect of the utility model, the transmission device of the full-disc brake is provided, the transmission device can reduce the loss of braking force in the transmission process and reduce the friction force between the push rod and the cover plate, so that the stress of the whole full-disc brake is more scientific and reasonable, the transmission process is more stable, and the structural design of the full-disc brake is optimized.

In some embodiments, as shown in fig. 2 and 3, the transmission includes a housing 200 and a linear translation mechanism within the housing 200 that includes a ramp gear 300 and a push rod 100.

As shown in FIG. 9, the cabinet 200 has a ring-shaped structure including an inner ring wall 210, an outer ring wall 220, and a side wall 230, the side wall 230 connects the inner ring wall 210 and the outer ring wall 220, the side wall 230 of the cabinet 200 is a closed end, and the other end of the cabinet 200 opposite to the side wall 230 is an open end.

The ramp gear 300 is of a ring structure and is installed in a space enclosed between the inner ring wall 210 and the outer ring wall 220 of the cabinet 200, and the outer circumferential surface of the ramp gear 300 has a plurality of ramps 302 arranged spirally.

The push rod 100 is installed between the outer circumferential surface of the ramp gear 300 and the outer circumferential wall 220 of the cabinet 200, the push rod 100 includes a main push rod 110, a bearing 120 and a side limit roller 140, the bearing 120 is installed at the bottom of the main push rod 110, the side limit roller 140 is installed at one side of the main push rod 110, and the bearing 120 of the push rod 100 is disposed on the ramp 302 of the ramp gear 300 to convert the circular motion of the ramp gear 300 into the linear motion of the push rod 100.

The inner circumferential surface of the outer circumferential wall 220 of the cabinet 200 has a plurality of grooves 221 spaced apart from each other in parallel with the axial direction, the side restricting rollers 140 of the push rod 100 are disposed to be positioned in the grooves 221, and the outer circumferential surfaces of the side restricting rollers 140 are engaged with both side surfaces of the grooves 221, that is, the side restricting rollers 140 roll in the grooves 221.

When the ramp gear 300 rotates, the push rod 100 is forced by the rotation of the spiral ramp 302, and not only bears a certain thrust force in the rod direction (normal direction of the ramp 302), but also bears a part of the thrust force in the tangential direction of the ramp 302, i.e. the push rod 100 can be caused to bear a torque or a bending moment. According to the full-disc brake of the embodiment of the utility model, as the transmission device is provided with the side limiting roller 140 at the outer side of the push rod 100, the groove 221 is formed in the inner side surface of the box shell 200, and the side limiting roller 140 is clamped in the groove 221, the torque or bending moment borne by the push rod 100 can be completely transmitted to the box shell 200 and then transmitted to the axle through the box shell 200. The whole full-disc brake is more scientific and reasonable in stress, and the transmission process of the transmission device is more stable.

As shown in fig. 13, when the push rod 100 is pushed by the ramp gear, the push rod mainly receives forces in three directions, a reaction force F1 exerted by the thrust bracket and the brake disk, a thrust force F2 exerted by the ramp gear and perpendicular to the ramp direction, a force F3 exerted by the cover plate, and a balance force F4 exerted by the groove of the housing to the push rod and perpendicular to the push rod. The balance force F4 can balance with the component forces of the acting force F3 and the pushing force F2 exerted by the cover plate, so that the torque or bending moment borne by the lower part of the push rod 100 can be completely transmitted to the box shell 200, the friction force between the push rod and the cover plate is reduced, the transmission process is more stable, and the power consumption is reduced.

In some embodiments, as shown in fig. 4-8, one end of the main push rod 110 has a base portion 111, the base portion 111 has an inwardly recessed bearing chamber 112, and the bearing 120 is mounted in the bearing chamber 112 by a pin 130. The highest point of the outer circumferential surface of the bearing 120 protrudes out of the bearing chamber 112 for rolling on the ramp 302.

Further, the base portion 111 is a U-shaped base, two sides of the base portion are provided with protruding support bases 113, the support bases 113 are provided with corresponding through holes 114, and the pin 130 is inserted into the through holes 114. Preferably, a certain process platform 225 or a thickened design may be designed in the peripheral region of the through hole 114 of the supporting base 113 to avoid bending, breaking and the like at the supporting position around the through hole 114.

In some embodiments, as shown in fig. 7, the side-restraining roller 140 is mounted on the pin 130 through a bushing 141, and the side-restraining roller 140 is fixedly mounted through the shoulder 131 of the inner pin 130 and the circlip 142 of the outer pin.

In some embodiments, the pin 130 has a first pin hole 132 along a radial direction thereof, and the support base 113 on one side of the base portion 111 also has a corresponding second pin hole 116, and the pin 130 is fixedly connected to the base portion 111 by a pin or an elastic rolling sheet installed in the two pin holes.

In some embodiments, an end of the main push rod 110 opposite the base portion 111 has an axially disposed hollow 117. Under the condition of the same material sectional area, the hollow structure has better strength and rigidity, the wall thickness of the hollow structure cannot be too thin, and the hollow structure is prevented from being locally folded to lose the bearing capacity.

Further, as shown in fig. 8, the side surface of the non-support base 111 has an arc-shaped recess 115 to further reduce its weight. The base portion 111 of the putter 100 is an arc-shaped support base 115, and the arc-shaped support structure can improve the bearing capacity of the entire putter 100.

In some embodiments, the cross-sectional shape of the base is larger than the cross-sectional shape dimension of the main pushrod 110. The cross section of the main push rod 110 is a rectangle with a pair of arc-shaped sides.

Preferably, the bearing 120 is a needle bearing 120, which has small friction resistance, low power consumption, compact structure, light weight and smaller axial dimension.

According to the push rod 100 of the embodiment of the utility model, the bottom is supported by the bearing 120, so that the friction resistance can be further reduced, the power consumption is reduced, the brake can exert the maximum efficiency, and the green and low-carbon economic requirements are met.

The base portion 111 of the push rod 100 adopts an arc-shaped supporting structure, so that the bearing capacity of the whole push rod 100 can be improved. Experiments prove that the push rod 100 is equivalent to the prior art, the bearing capacity can be increased by 50%, and the push rod can transmit the braking force of 7 t. In addition, the lateral limiting roller 140 is installed on the outer side of the push rod 100, so that the bending moment or the torque can be effectively transmitted to the box shell 200, and the transmission process is more stable.

According to another aspect of the utility model, a housing 200 for an all-disc brake is also provided. As shown in fig. 9-12, the entrance end of the groove 221 is flush with the end surface of the open end of the cabinet 200 so that the side restricting roller of the push lever 100 is fitted in. The side of the groove 221 away from the inner circumferential surface of the outer circumferential wall 220 has an enlarged portion 222, and the enlarged portion 222 has a size slightly larger than the diameter of the side-restricting roller 140 so that the side-restricting roller 140 can easily enter the groove 221. The cross-section of the groove 221 is substantially rectangular.

In some embodiments, the housing 200 has a thickened structure at locations on both sides of each recess 221 to increase the strength of the housing 200. Specifically, the thickened structure comprises a thickened upper edge 223 positioned at the end face position of the open end of the cabinet 200 and a thickened lower edge 224 positioned at the end face position of the closed end of the cabinet 200. Further, the cabinet 200 has a process station 225 on at least one side of the thickened rim 224.

In some embodiments, the edges of the groove 221 and the end surface of the open end of the cabinet 200 are in transition connection by using chamfers or fillets 227, so that stress concentration is avoided and the installation is convenient; the inner wall 210, the outer wall 220, and the side wall 230 of the housing 200 are integrally formed. The length of the groove 221 is smaller than the thickness of the cabinet 200.

In some embodiments, the number of the grooves 221 is the same as the number of the ramps 302 of the ramp gear 300 and the number of the push rods 100, and three grooves may be provided, but is not limited thereto.

The case shell 200 of the full-disc brake is provided with the groove 221 capable of being provided with the side limiting roller, can effectively bear the torque or bending moment of the push rod 100 of the full-disc brake, and transmits the force to the axle, so that the stress of the whole full-disc brake is more scientific and reasonable, and the transmission process is more stable.

According to a further aspect of the utility model, there is also provided an all-disc brake comprising the transmission as described above, which is particularly suitable for use in heavy trucks.

According to the transmission device of the full-disc brake and the full-disc brake, the beneficial effects at least comprising the following steps are obtained:

(1) according to the full-disc brake provided by the embodiment of the utility model, the transmission device is provided with the side limiting roller at the outer side of the push rod, the inner side surface of the box shell is provided with the groove, and the side limiting roller is clamped in the groove, so that the torque or bending moment borne by the push rod can be completely transmitted to the box shell and then transmitted to the axle through the box shell. The whole full-disc brake is more scientific and reasonable in stress, and the transmission process of the transmission device is more stable.

(2) According to the push rod provided by the embodiment of the utility model, the bottom of the push rod is supported by the bearing, so that the friction resistance can be further reduced, the power consumption is reduced, the brake can exert the maximum efficiency, and the green low-carbon economic requirement is met. The base part of the push rod adopts an arc-shaped supporting structure, so that the bearing capacity of the whole push rod can be improved.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments in the present invention.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A push rod of an all-disc brake for converting a rotational motion of a ramp gear into a linear motion to push a brake disc, comprising:

a main push rod having a base part at one end thereof, the base part having a bearing chamber depressed inward;

the bearing is installed in a bearing chamber at the bottom of the main push rod through a pin shaft, and the highest point of the peripheral surface of the bearing protrudes out of the bearing chamber so as to roll on a ramp.

2. The push rod of an all-disc brake according to claim 1, wherein the base portion of the push rod is an arc-shaped support seat.

3. The push rod of the all-disc brake as claimed in claim 1, wherein the base portion is a U-shaped base having protruding support seats on both sides thereof, the support seats having corresponding through holes, and the pin shaft is inserted into the through holes.

4. The push rod of the all-disc brake as claimed in claim 3, wherein a side limiting roller is installed at one end of the pin shaft far away from the ramp gear, and the side limiting roller is located on the outer side of the main push rod.

5. The push rod of the all-disc brake as claimed in claim 4, wherein the side limiting roller is mounted on the pin shaft through a shaft sleeve, and the side limiting roller is fixedly mounted through a shaft shoulder of the inner pin shaft and an elastic check ring of the outer side.

6. The push rod of the full-disc brake according to claim 3, wherein the pin shaft has a first pin hole along its radial direction, and the support seat on one side of the base portion also has a corresponding second pin hole, and the pin shaft is fixedly connected with the base portion through a pin or an elastic rolling sheet installed in the two pin holes.

7. The tappet of an all-disc brake according to claim 3, wherein the non-support seat side of the base portion has an arcuate recess.

8. The push rod of the full-disc brake according to claim 2, wherein the cross-sectional shape of the base is larger than the cross-sectional shape and size of the main push rod, and/or the cross-section of the main push rod is a rectangle with arc-shaped sides.

9. The push rod of an all-disc brake according to claim 2, wherein an end of the main push rod opposite to the base portion has an axially arranged hollow.

10. Push rod of an all-disc brake according to any of claims 1 to 9, characterized in that the bearing is a needle bearing.

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