CN218235920U - Actuating mechanism and electromechanical brake caliper - Google Patents

Abstract

The utility model relates to an electromechanical type brake caliper technical field discloses an actuating mechanism and electromechanical type brake caliper. The actuating mechanism comprises a screw rod, a piston and balls, and a first roller path which is spirally distributed is arranged on the periphery of the screw rod; the piston is provided with an axially through center hole, the hole wall of the center hole is provided with a second roller path which is spirally distributed, the outer wall of the piston is provided with a limiting groove which is axially distributed, and the outer wall of the piston is also provided with air holes; the balls are capable of moving along the first and second raceways simultaneously to transfer forces generated by the rotary motion of the screw to the piston. The utility model can omit the arrangement of nuts, simplify the number of parts, and make the structure of the actuating mechanism more compact, thereby realizing the large-size design of the actuating mechanism in the same installation space and improving the load capacity and durability of the actuating mechanism; secondly, the limiting groove is formed in the outer wall of the piston, so that the processing difficulty can be reduced; finally, the problems of abnormal sound and low driving efficiency can be avoided by arranging the air holes.

Description

Actuating mechanism and electromechanical brake caliper

Technical Field

The utility model relates to an electromechanical type brake caliper technical field especially relates to an actuating mechanism and electromechanical type brake caliper.

Background

With the rapid development of technological progress in recent years, the change of automobile technology brings comfort and convenience to people, and simultaneously, the requirement on automobile safety is continuously improved. Among them, the braking performance of the automobile is also receiving more and more attention and attention as the most important defense line for the safe driving of the automobile, and the excellent braking performance is the very important guarantee for the safe driving of the automobile.

The development trend of an Electronic Mechanical Brake (EMB) system as an automobile Brake-by-wire technology has gradually popularized conditions through technical accumulation and development evolution for many years, and the EMB system has the characteristics of simple structure, excellent braking performance, energy conservation and environmental protection, and has wide market application prospect.

The prior art provides a structure of electromechanical brake caliper, which uses a ball screw mechanism to push a piston to move forward to implement a clamping force on a friction plate, and this structural design uses a split type piston and nut to cooperate. Because of it has adopted split type piston and nut cooperation structural design, lead to its when using at less cylinder diameter calliper, ball is limited because of size structural design reason external diameter size to can lead to this structural load intensity and durability not enough to appear.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an actuating mechanism and electromechanical formula brake caliper, compact structure can realize actuating mechanism's jumbo size design under equal installation space, has promoted actuating mechanism's load-carrying capacity and durability, can also avoid the abnormal sound that leads to because of the atmospheric pressure inequality in the piston inner chamber when the lead screw is rotatory and the problem that drive efficiency is low.

To achieve the purpose, the utility model adopts the following technical proposal:

an actuator, comprising:

the outer peripheral wall of the screw rod is provided with a first roller path which is spirally distributed;

the piston is provided with a central hole which is axially communicated, the piston is sleeved on the periphery of the screw rod through the central hole, a second rolling way which is spirally distributed is arranged on the hole wall of the central hole, a limiting groove which is axially distributed is arranged on the outer wall of the piston, and a plurality of air holes which are communicated with the central hole are formed in the outer peripheral wall of the piston;

the ball bearings are arranged on the first rolling path and the second rolling path at the same time and can move along the first rolling path and the second rolling path at the same time so as to transmit the force generated by the rotation of the screw to the piston.

As the preferred technical scheme of the actuating mechanism, a flange plate is sleeved on the screw rod.

As an optimal technical scheme of the actuating mechanism, one end of the flange plate facing the first raceway is provided with a first limiting boss, a hole wall of a center hole of the piston is provided with a second limiting boss, the second limiting boss is located on one side of the second raceway close to the flange plate, and when the screw drives the piston to move towards the direction close to the flange plate, the first limiting boss can be abutted against the second limiting boss so as to limit the limit position of the piston moving towards the direction close to the flange plate.

As a preferred technical solution of the actuator, the lead screw includes a first cylindrical section, a second cylindrical section, and a third cylindrical section that are connected in sequence, and diameters of the first cylindrical section, the second cylindrical section, and the third cylindrical section decrease in sequence, the first raceway is disposed on the first cylindrical section, the flange is disposed on the second cylindrical section and abuts against a shaft shoulder formed by the first cylindrical section and the second cylindrical section, and the third cylindrical section is used for being connected with the driving mechanism.

As a preferred technical scheme of the actuating mechanism, the center of the first cylindrical section is provided with lightening holes distributed along the axial direction.

As a preferable technical solution of the actuator, a revolving groove is provided on the piston, a revolving member is provided in the revolving groove, and the revolving member is configured to make the balls revolve in the first raceway and the second raceway.

As the preferred technical scheme of the actuating mechanism, two process planes are arranged on the piston and are axially and symmetrically arranged.

As a preferable technical scheme of the actuating mechanism, one end, far away from the lead screw, of the piston is provided with an end cover.

As a preferable technical scheme of the actuating mechanism, the end cover is provided with a sealing ring groove and an application groove.

An electromechanical brake caliper comprising an actuator according to any one of the above aspects.

The utility model has the advantages that:

the utility model provides an actuating mechanism, at first, set up the centre bore on the piston, and the pore wall processing of centre bore has the second raceway with first raceway looks adaptation on the lead screw, and set up the ball in first raceway and second raceway, make the ball form the ball screw pair with first raceway and second raceway, thereby can save the setting of nut, the part quantity has been simplified, make actuating mechanism's structure compacter, and then can realize actuating mechanism's jumbo size design under equal installation space, actuating mechanism's load-carrying capacity and durability have been promoted; secondly, a limiting groove for limiting the rotation of the piston is formed in the outer wall of the piston and extends along the axial direction of the piston, so that the processing difficulty can be reduced; finally, through setting up the bleeder vent, can avoid the abnormal sound and the low problem of drive efficiency that lead to because of the atmospheric pressure inequality in the piston inner chamber when the lead screw is rotatory.

Drawings

Fig. 1 is a schematic structural diagram of an electromechanical brake caliper according to an embodiment of the present invention;

fig. 2 is an exploded schematic view of an actuator according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a screw according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of a lead screw according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a piston according to an embodiment of the present invention;

fig. 6 is a sectional view of a piston according to an embodiment of the present invention.

In the figure:

10. a friction plate; 20. a housing;

31. a lead screw; 311. a first cylindrical section; 3111. a first raceway; 3112. lightening holes; 312. a second cylindrical section; 313. a third cylindrical section; 32. a piston; 321. a second raceway; 322. a limiting groove; 323. a second limit boss; 323a, a second stop surface; 324. a rotary trough; 325. a rotating member; 326. air holes are formed; 327. a process plane; 33. a flange plate; 331. a first limit boss; 331a, a first stop surface; 34. an end cap; 341. a seal ring groove; 342. a force application groove; 35. a ball bearing;

40. a limit bolt; 50. and a bearing.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements relevant to the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or 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 terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1, the embodiment of the utility model provides an electromechanical brake caliper, including two friction discs 10, casing 20, actuating mechanism and actuating mechanism, two friction discs 10 set up respectively in the both sides of brake disc, and actuating mechanism sets up on casing 20, and actuating mechanism is connected with the actuating mechanism drive, and actuating mechanism can turn into linear motion with actuating mechanism's rotary motion, and actuating mechanism can drive two friction discs 10 and be close to each other or keep away from to press from both sides tightly or release the brake disc. The embodiment mainly improves the actuating mechanism, and other mechanisms are in the prior art and are not described in detail herein.

Specifically, as shown in fig. 2 to fig. 6, an actuator provided by the embodiment of the present invention includes a screw 31, a piston 32, and balls 35, wherein an outer peripheral wall of the screw 31 is provided with a first raceway 3111 spirally distributed; the piston 32 is provided with an axially through center hole, the piston 32 is sleeved on the periphery of the screw rod 31 through the center hole, the hole wall of the center hole is provided with the second roller paths 321 which are spirally distributed, and the piston 32 adopts an axial through hole type structural design, so that the second roller paths 321 can be machined, and the machining difficulty of parts can be reduced; the balls 35 are simultaneously disposed on the first and second raceways 3111 and 321, and the balls 35 can simultaneously move along the first and second raceways 3111 and 321 to transmit the force generated by the rotation of the screw 31 to the piston 32.

When the electromechanical brake caliper works, the screw 31 is driven to rotate by the driving mechanism, the ball 35 is driven by the screw 31 to advance spirally in the first raceway 3111 and the second raceway 321, so that the ball 35 transmits the force generated by the rotation of the screw 31 to the piston 32, the force applied to the piston 32 by the ball 35 is decomposed to form a first decomposed force which drives the piston 32 to move linearly in the axial direction and a second decomposed force which drives the piston 32 to move rotationally in the circumferential direction, and the second decomposed force which drives the piston 32 to rotate is usually suppressed, so that the piston 32 can move linearly, and the piston 32 can drive the two friction plates 10 to move close to or away from each other to clamp or release the brake disc. In this embodiment, the outer wall of the piston 32 is provided with a limiting groove 322 distributed along the axial direction, the housing 20 is provided with a limiting bolt 40, and the end of the limiting bolt 40 extends into the limiting groove 322. By the arrangement of the stopper bolt 40 and the stopper groove 322, the rotational movement of the piston 32 can be restricted so that the piston 32 can move in the axial direction. The above-mentioned structural style of spacing groove 322 does not influence the whole processing technology of piston 32, can normally process when processing the excircle of piston 32 promptly, for example can carry out normal grinding, later independently again through milling or other forms accomplish the processing of spacing groove 322 once, compare in the prior art special-shaped form of preventing changeing, wholly can reduce the processing degree of difficulty. Meanwhile, the overall shape of the piston 32 is not affected by the structural form of the limiting groove 322, the piston 32 still has an overall round shape, the effect of round forward movement can be achieved, the forward resistance is small, and the reciprocating movement is smoother. In addition, the limiting groove 322 is formed in the piston 32, so that the situation that the groove is formed in the shell 20 can be avoided, only one hole needs to be formed in the shell 20, and the hole is locked by the pin or the bolt matched with the limiting groove 322, and compared with the case that the groove is formed in the shell 20, the processing technology is simpler.

The embodiment of the utility model provides an actuating mechanism, set up the centre bore on piston 32, and the pore wall processing of centre bore have with the second raceway 321 of the first raceway 3111 looks adaptation on the lead screw 31, and set up ball 35 in first raceway 3111 and second raceway 321, it is vice to make ball 35 and first raceway 3111 and second raceway 321 form ball, thereby can save the setting of nut, the part quantity has been simplified, make actuating mechanism's structure compacter, and then can realize actuating mechanism's jumbo size design under equal installation space, actuating mechanism's load-carrying capacity and durability have been promoted.

The lead screw 31 is sleeved with the flange plate 33, the flange plate 33 and the lead screw 31 can be in interference fit, the lead screw 31 and the flange plate 33 are in split design, the rolling process in the manufacturing process of the first roller path 3111 on the lead screw 31 is convenient to realize, and the process difficulty of part processing is reduced. A bearing 50 is arranged between the flange 33 and the shell 20, and the flange 33 and the bearing 50 are matched to rotate so as to bear axial load generated when the actuator moves. Preferably, the screw 31 comprises a first cylindrical section 311, a second cylindrical section 312 and a third cylindrical section 313 which are connected in sequence, the diameters of the first cylindrical section 311, the second cylindrical section 312 and the third cylindrical section 313 are reduced in sequence, the first raceway 3111 is arranged on the first cylindrical section 311, the flange plate 33 is arranged on the second cylindrical section 312 and abuts against a shaft shoulder formed by the first cylindrical section 311 and the second cylindrical section 312, and the third cylindrical section 313 is used for connecting with a driving mechanism. The structure is reasonable, and the flange plate 33 is convenient to position and mount. Preferably, the center of the first cylindrical section 311 is provided with weight-reducing holes 3112 distributed along the axial direction for weight reduction and process positioning. Preferably, the thickness of the second cylindrical section 312 is equal to the thickness of the flange 33, which further facilitates the mounting of the flange 33.

The flange plate 33 is provided with a first limit boss 331 at an end facing the first raceway 3111, the first limit boss 331 can be formed quickly by a cold heading stamping process, and the efficiency of processing parts is improved, the hole wall of the central hole of the piston 32 is provided with a second limit boss 323, the second limit boss 323 is located on one side of the second raceway 321 close to the flange plate 33, and when the screw 31 drives the piston 32 to move in a direction close to the flange plate 33, the first limit surface 331a of the first limit boss 331 can abut against the second limit surface 323a of the second limit boss 323 to limit a limit position of the piston 32 moving in a direction close to the flange plate 33. Through the arrangement, when the piston 32 moves to the limit position in the direction close to the flange 33, a certain gap is left between the piston 32 and the flange 33, and the problem that the piston 32 and the lead screw 31 are blocked is avoided.

The piston 32 is provided with a rotation groove 324, and a rotation member 325 is provided in the rotation groove 324, and the rotation member 325 is configured to rotate the balls 35 in the first raceway 3111 and the second raceway 321. By providing the rotary member 325, the balls 35 can be more smoothly rotated in the first and second ball grooves 3111 and 321.

During the rotation of the screw, negative pressure is generated inside the piston 32, which affects the rotation of the balls 35, reduces the driving efficiency, and generates undesirable noise. Therefore, in the present embodiment, a plurality of air holes 326 are disposed on the piston 32, and the air holes 326 are communicated with the central hole. Through setting up bleeder vent 326, can make the inside atmospheric pressure of piston 32 flow evenly smooth and easy, avoid the problem of the abnormal sound and the drive inefficiency that lead to because of the atmospheric pressure is uneven in the piston 32 inner chamber when lead screw 31 is rotatory. Preferably, the plurality of air holes 326 are spaced along the circumference of the piston 32, so that the resistance to the system is reduced while the pressure balance between the inside and the outside of the piston 32 is maintained.

In addition, the size of the vent holes requires care, and if too small, sharp airflow may occur resulting in a whistle sound, thus requiring special verification and selection of the corresponding size of the holes. For example, if the diameter of the air hole is within 1cm, sound may be generated due to high speed, and if the diameter is adjusted to be more than 2cm, the adjustment and verification need to be performed according to the size of the space.

Two process planes 327 are further machined on the piston 32, and the two process planes 327 are axially symmetrically arranged. By providing the process plane 327, it is possible to provide a tool holding and positioning function for processing the piston 32.

An end cover 34 is further disposed at an end of the piston 32 away from the flange 33, and the end cover 34 may be in interference fit with the piston 32. By providing the end cap 34, impurities can be prevented from entering the piston cavity to protect the balls 35. Preferably, the end cap 34 is provided with a seal groove 341, and a seal ring can be assembled in the seal groove 341, and the seal ring is used for sealing a gap between the end cap 34 and the housing 20 to prevent external dust, moisture and the like from polluting the piston kinematic pair and the screw kinematic pair. Preferably, the end cap 34 is further provided with a force application groove 342, and the force application groove 342 is used for providing a force application point for the tool when the actuator is assembled or maintained.

It is to be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. An actuator, comprising:

the screw rod (31), the peripheral wall of the screw rod (31) is provided with a first raceway (3111) which is spirally distributed;

the piston (32) is provided with a central hole which is axially communicated, the piston (32) is sleeved on the periphery of the screw rod (31) through the central hole, the hole wall of the central hole is provided with a second rolling way (321) which is spirally distributed, the outer wall of the piston (32) is provided with a limiting groove (322) which is axially distributed, and the outer peripheral wall of the piston (32) is also provided with a plurality of air holes (326) which are communicated with the central hole;

balls (35), the balls (35) are arranged on the first raceway (3111) and the second raceway (321) at the same time, and the balls (35) can move along the first raceway (3111) and the second raceway (321) at the same time so as to transmit the force generated by the rotation of the screw (31) to a piston (32).

2. Actuator according to claim 1, wherein the threaded spindle (31) is provided with a flange (33) on the sleeve.

3. Actuator according to claim 2, wherein the end of the flange (33) facing the first raceway (3111) is provided with a first stop projection (331), the hole wall of the central hole of the piston (32) is provided with a second stop projection (323), and the second stop projection (323) is located on the side of the second raceway (321) close to the flange (33), and the screw (31) is moved in a direction of moving the piston (32) close to the flange (33), the first stop projection (331) can abut against the second stop projection (323) to limit the limit position of the movement of the piston (32) in a direction of moving the piston (32) close to the flange (33).

4. Actuator according to claim 2, wherein the threaded spindle (31) comprises a first cylindrical section (311), a second cylindrical section (312) and a third cylindrical section (313) which are connected in sequence, and the diameters of the first cylindrical section (311), the second cylindrical section (312) and the third cylindrical section (313) are reduced in sequence, the first track (3111) is arranged on the first cylindrical section (311), the flange (33) is arranged on the second cylindrical section (312) and abuts against a shoulder formed by the first cylindrical section (311) and the second cylindrical section (312), and the third cylindrical section (313) is used for connecting with a driving mechanism.

5. Actuator according to claim 4, wherein the first cylindrical section (311) is provided with weight-reducing holes (3112) in the centre thereof, distributed in the axial direction.

6. Actuator according to claim 1, wherein a swivel groove (324) is provided on the piston (32), a swivel member (325) being provided in the swivel groove (324), the swivel member (325) being configured to enable a swivel of the balls (35) within the first and second raceways (3111, 321).

7. Actuator according to claim 1, wherein two process planes (327) are provided on the piston (32), and wherein the two process planes (327) are arranged in axial symmetry.

8. Actuator according to claim 1, wherein the end of the piston (32) remote from the screw (31) is provided with an end cap (34).

9. Actuator according to claim 8, wherein the end cap (34) is provided with a sealing ring groove (341) and a force application groove (342).

10. Electromechanical brake calliper, characterised in that it comprises an actuator according to any of claims 1-9.

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