CN213862207U - Thrust transmission mechanism of electronic brake booster - Google Patents

Abstract

The utility model provides an electronic brake booster thrust transfer mechanism mainly including the casing that has the cavity, the ejector pin assembly and the support assembly that have base and ejector pin, wherein: the ejector rod assembly is connected with the power input end of the main cylinder through the ejector rod, and an anti-falling structure for preventing the ejector rod assembly from being separated from the power input end is arranged on the ejector rod and/or the power input end; the supporting assembly is arranged in the cavity in a sliding mode and can be driven by an external driving device to drive the base to move, and finally power is transmitted to the power input end of the main cylinder through the ejector rod. Electronic brake booster thrust transmission mechanism, through setting up the support assembly to add anti-disengaging structure and reliably be connected the power input end of ejector pin and master cylinder, can prevent effectively that ejector pin assembly and power input end from producing the problem of disalignment, prevent to produce the unbalance loading effort between ejector pin assembly and the base, thereby prevent that the abnormal sound problem from appearing in the master cylinder.

Description

Thrust transmission mechanism of electronic brake booster

Technical Field

The utility model relates to a stopper technical field, in particular to electronic brake booster thrust transmission mechanism.

Background

With the popularization of new energy vehicles and the application of automatic driving technology, the electronic brake booster is gradually replacing a vacuum boosting mechanism on the traditional new energy vehicle due to the advantages of high response rate, intelligent braking support, braking energy recovery, pedal feel software adjustability and the like.

The power source of the electronic brake booster is generally a high-performance motor, the motor amplifies the torque of the motor through a transmission mechanism such as a gear rack, a screw rod and a threaded sleeve, the rotary motion is converted into linear motion, and finally the thrust for driving a piston to perform linear motion is output, so that a main cylinder builds hydraulic pressure on a brake of a vehicle, and braking is performed.

In order to facilitate the master cylinder to build up hydraulic pressure to the brakes of the vehicle, force transfer mechanisms are generally designed to cooperate with the master cylinder. This power transmission device generally includes gliding support piece and ejector pin, however because of each part all has dimensional tolerance to and support piece actual axis position receives transmission part tolerance accumulation influence, consequently there is the problem of disalignment after the assembly in support piece and ejector pin axis, this problem can lead to two parts to carry the atress separately when cooperating, the ejector pin unbalance loading atress can lead to the ejector pin slope, thereby lead to the master cylinder side direction atress, the master cylinder abnormal sound problem appears, the noise increase, and support piece unbalance loading atress can lead to local stress too big.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to an electronic brake booster thrust transfer mechanism to improve the coaxiality between a support member and a carrier rod.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

an electric brake booster thrust transfer mechanism comprising:

the shell is internally provided with a cavity;

the ejector rod assembly comprises a base and an ejector rod detachably connected with the base, the ejector rod assembly is connected with the power input end of the main cylinder through the ejector rod, and an anti-falling structure for preventing the ejector rod assembly from being separated from the power input end is arranged on the ejector rod and/or the power input end;

and the support assembly is arranged in the cavity in a sliding manner and is driven by an external driving device, the support assembly drives the base to move, and finally the ejector rod transmits power to the power input end of the main cylinder.

Furthermore, a plug hole is formed in one of the base and the ejector rod, and a ball head capable of being inserted into the plug hole is formed in the other of the base and the ejector rod.

Furthermore, the power input end comprises a piston with an insertion hole, the ejector rod is provided with a rod body inserted in the insertion hole, and the anti-falling structure comprises a bushing sleeved on the rod body and inserted in the insertion hole.

Furthermore, the support assembly comprises a guide frame slidably disposed in the cavity, and a support member fixedly disposed on the guide frame, and the support assembly drives the base via the support member.

Furthermore, an accommodating cavity with an opening facing the base is arranged on the supporting piece, and a guide part for guiding the base to slide into the accommodating cavity is formed at the edge of the opening.

Furthermore, an outer convex part which can be abutted against the inner wall of the cavity is formed on the supporting part, and the outer convex part is arranged around the circumferential direction of the supporting part.

Furthermore, an oil groove is formed on the outer convex part.

Furthermore, a reinforcing rib for reinforcing the outer convex part is arranged on the supporting part.

Furthermore, the guide frame is connected with the supporting piece in an inserting mode.

Furthermore, a sensor yielding hole is formed in the support piece.

Compared with the prior art, the utility model discloses following advantage has:

(1) electronic brake booster thrust transmission mechanism, through addding anti-disengaging structure, and be connected the power input end of ejector pin and master cylinder, can prevent effectively that ejector pin assembly and power input end from producing the problem of disalignment, when preventing to produce the unbalance loading effort between ejector pin assembly and the base to prevent that the master cylinder from appearing the abnormal sound problem.

(2) The base and the ejector rod are provided with the inserting holes in a forming mode, and the other one of the base and the ejector rod is provided with the ball head in a forming mode, so that the ejector rod assembly can be freely adjusted according to the stress condition, the power input end of the main cylinder is prevented from being subjected to lateral force, and the problem of abnormal sound of the main cylinder is prevented.

(3) The input end selects a piston with an insertion hole, and the ejector rod is provided with a rod body inserted in the insertion hole and can be matched with other existing structures, so that the cost is lower; the rod body is sleeved with the bushing, the structure is simple, and the rod body assembly can be effectively prevented from falling off from the insertion hole.

(4) The support piece is provided with the accommodating cavity with the guide part, so that the base can smoothly slide into the accommodating cavity, the ejector rod assembly and the support assembly can be prevented from being axially misaligned when being matched, and the problem of abnormal sound of the main cylinder caused by unbalanced load stress of the ejector rod assembly and the support assembly is prevented.

(5) The support piece is provided with the outer convex part which can be matched with the inner wall of the cavity, so that the ejector rod assembly and the support assembly are axially overlapped when matched, and the eccentric load stress of the ejector rod assembly and the support assembly can be effectively prevented, thereby effectively preventing the abnormal sound of the main cylinder.

(6) The oil grooves are formed in the outer convex parts, so that lubricating grease can be stored conveniently, and friction noise in the sliding process of the support assembly can be effectively reduced.

(7) The reinforcing ribs are arranged on the supporting piece, so that the structural strength of the outer convex part can be enhanced.

(8) The guide frame is connected with the supporting piece in an inserting mode, the assembly and disassembly are convenient, and the axial coincidence of the guide frame and the supporting piece is facilitated.

(9) The sensor abdicating hole is formed in the supporting piece, so that the sensor is convenient to install, and the whole structure arrangement is convenient.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic structural diagram of a thrust transmission mechanism of an electronic brake booster according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of the assembly of the carrier rod assembly and the support assembly;

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

FIG. 4 is a schematic view of the structure of FIG. 3 from another perspective;

fig. 5 is a schematic structural diagram of a push rod assembly according to an embodiment of the present invention;

fig. 6 is an exploded view of fig. 5.

Description of reference numerals:

1. a housing; 2. a base; 3. a top rod; 4. a bushing; 5. a guide frame; 6. a support member; 7. a piston; 8. a drive rod;

101. a cavity;

201. a base plate; 202. a connecting portion;

301. a rod body; 302. a ball head;

601. an accommodating chamber; 6011. a guide portion; 602. an outer convex portion; 603. reinforcing ribs; 604. an oil sump; 605. mounting blocks; 606. a sensor abdicating hole;

701. and (5) inserting holes.

Detailed Description

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

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The embodiment relates to a thrust transmission mechanism of an electronic brake booster, which mainly comprises a shell, a mandril assembly and a support assembly. The support assembly can be driven by an external driving device to drive the base to move, and finally, the ejector rod transmits power to the power input end of the main cylinder.

Based on the above overall structure description, an exemplary structure of the thrust transfer mechanism of the electronic brake booster of the present embodiment is shown in fig. 1, and both ends of the cavity 101 in the housing 1 are provided with openings, and the structure thereof can refer to the existing structure, and the present embodiment is not described in detail. The main improvement points of this embodiment are the structure of the support assembly slidably disposed in the cavity 101, and the push rod assembly cooperating with the support assembly to transmit power to the power input end of the master cylinder.

In order to facilitate a better understanding of the present embodiment, the structure of the support assembly will be briefly described below with reference to fig. 2 to 4. The supporting assembly comprises a guide frame 5 arranged in the cavity 101 in a sliding mode and a supporting piece 6 fixedly arranged on the guide frame 5, and the supporting assembly drives the ejector rod assembly to move through the supporting piece 6. Wherein, leading truck links firmly together with actuating lever 8, and actuating lever 8 can be rotated by the drive of external drive device, and the present rotation drive device of this external drive device optimization, because be equipped with guide structure between leading truck 5 and the casing 1, consequently leading truck 5 can drive support piece 6 and slide in cavity 1, and the structure of external drive device, guide structure, leading truck 5 can refer to current structure, and this embodiment no longer details.

In a preferred embodiment, the guide frame 5 is formed with a plurality of mounting holes, the mounting holes are uniformly distributed around the axial center line of the guide frame 5, the support member 6 is provided with mounting blocks 605 capable of being inserted into the mounting holes, and the number of the mounting holes corresponds to the number of the mounting blocks 605, so that the problem of non-axial occurrence after the guide frame 5 and the support member 6 are assembled can be prevented.

Still referring to fig. 2 to 4, a receiving cavity 601 is formed at one end of the supporting member 6, the receiving cavity 601 has an opening facing the base 2 described below, and a guiding portion 6011 is formed at an edge of the opening to guide the base 2 to slide into the receiving cavity 601. In this embodiment, the guiding portion 6011 is preferably formed with a chamfer or a fillet at the edge of the opening to facilitate the smooth sliding of the bottom plate 201 of the base 2 into the accommodating cavity 601, thereby facilitating the axial coincidence of the supporting member 6 and the base 2.

In order to improve the coaxiality between the supporting member 6 and the housing 1, an outer protrusion 602 capable of abutting against the inner wall of the cavity 101 is formed on the supporting member 6, and the outer protrusion 602 is disposed around the circumference of the supporting member 6. Due to the arrangement of the structure, in the process that the support assembly is driven by the external driving device to be upwards matched with the ejector rod assembly, the outer convex part 602 of the support piece 6 can be matched with the inner wall of the cavity 101, so that the problem of non-coaxial connection after the support piece 6 is assembled with the shell 1 is solved.

In this embodiment, the supporting member 6 is provided with a plurality of ribs 603 for reinforcing the outer protrusion 602, and the plurality of ribs 603 are preferably distributed around the circumferential direction of the supporting member 6, so that the structural strength of the outer protrusion 602 can be effectively enhanced.

In this embodiment, an oil groove 604 is formed on the outer protrusion 602, and the oil groove 604 is circumferentially disposed around the supporting member 6 to store grease, so as to effectively reduce friction noise during the sliding process of the supporting assembly.

In addition, a sensor abdicating hole 606 is formed in the support member 6, and in a preferred embodiment, a sensor mounting hole penetrates from the upper portion to the lower portion of the support member 6 to abdicate the needle of the sensor, and the specific structure and mounting manner of the sensor may be determined by referring to the existing structure.

To facilitate understanding of the push rod assembly of the present embodiment, the structure of the master cylinder will be briefly described. The power input end comprises a piston 7, the structure of the power input end can refer to the prior structure, an insertion hole 701 is formed in the piston 7, and the insertion hole 701 is coaxially arranged with the piston 7 so as to be connected with a push rod 3 which is described below.

Next, the structure of the jack assembly will be described with reference to fig. 5 to 6, which mainly includes a base 2, and a jack 3 detachably connected to the base 2. In a specific structure, the base 2 includes a bottom plate 201 and a connecting portion 202 integrally formed with the bottom plate 201, so that the cross-sectional shape of the base 2 is "T" shaped, the connecting portion 202 is columnar, an insertion hole not shown in the figure is formed in the connecting portion 202, an opening of the insertion hole is preferably circular, and a conical cavity coaxial with the rod 301 described below is formed inside the insertion hole.

The ejector rod 3 comprises a rod body 301, one end of the rod body 301 is of a hemispherical structure, the other end of the rod body 301 is integrally and fixedly connected with a ball head 302, and the ejector rod 3 is riveted with the insertion hole of the base 2 through the ball head 302 to form an ejector rod assembly. And the ejector rod 3 is inserted into the insertion hole 701 through the rod body 301, and in order to improve the connection reliability between the ejector rod 3 and the base 2, a bushing 4 is sleeved on the rod body 301, the ejector rod assembly is in interference fit with the insertion hole 701 on the piston 7 of the main lever through the bushing 4, that is, the rod body 301 is fixed in the insertion hole 701 through the bushing 4, so that the ejector rod assembly is effectively prevented from falling off from the insertion hole 701.

According to the arrangement of the structure, in the matching process of the ejector rod assembly and the support assembly, when offset load acting force occurs between the ejector rod assembly and the support assembly, the ejector rod assembly can be freely adjusted according to the stress condition, so that the power input end of the main cylinder is prevented from being subjected to lateral acting force, and the problem of abnormal sound generated by the main cylinder is only prevented.

The electronic brake booster thrust transfer mechanism of this embodiment through the setting as above structure, has higher connection reliability between ejector pin 3 and the base 2 of ejector pin assembly, can prevent to produce the unbalance loading effort between ejector pin assembly and the support assembly, and the ejector pin assembly can freely be adjusted according to the atress condition, prevents that the power input end of master cylinder from receiving the yawing force to prevent that the abnormal sound problem from appearing in the master cylinder, have better practicality.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An electric brake booster thrust transfer mechanism characterized by comprising:

the device comprises a shell (1), wherein a cavity (101) is formed in the shell (1);

the ejector rod assembly comprises a base (2) and an ejector rod (3) detachably connected with the base (2), the ejector rod assembly is connected with the power input end of the main cylinder through the ejector rod (3), and an anti-disengaging structure for preventing the ejector rod assembly from disengaging from the power input end is arranged on the ejector rod (3) and/or the power input end;

and the support assembly is arranged in the cavity (101) in a sliding manner and is driven by an external driving device, the support assembly drives the base (2) to move, and finally the ejector rod (3) transmits power to the power input end of the main cylinder.

2. The electric brake booster thrust transfer mechanism of claim 1, wherein: an inserting hole is formed in one of the base (2) and the ejector rod (3), and a ball head (302) capable of being inserted into the inserting hole is formed in the other of the base (2) and the ejector rod (3).

3. The electric brake booster thrust transfer mechanism of claim 1, wherein: the power input end comprises a piston (7) with an insertion hole (701), the ejector rod is provided with a rod body (301) inserted into the insertion hole (701), and the anti-falling structure comprises a bushing (4) sleeved on the rod body (301) and inserted into the insertion hole (701).

4. The electric brake booster thrust transfer mechanism according to any one of claims 1 to 3, characterized in that: the supporting assembly comprises a guide frame (5) arranged in the cavity (101) in a sliding mode and a supporting piece (6) fixedly arranged on the guide frame (5), and the supporting assembly drives the base (2) through the supporting piece (6).

5. The electric brake booster thrust transfer mechanism of claim 4, wherein: an accommodating cavity (601) with an opening facing the base (2) is arranged on the supporting piece (6), and a guide part (6011) for guiding the base (2) to slide into the accommodating cavity (601) is formed at the edge of the opening.

6. The electric brake booster thrust transfer mechanism of claim 4, wherein: an outer convex part (602) which can be abutted against the inner wall of the cavity (101) is formed on the supporting part (6), and the outer convex part (602) is arranged around the circumference of the supporting part (6).

7. The electric brake booster thrust transfer mechanism of claim 6, wherein: an oil groove (604) is formed on the outer convex part (602).

8. The electric brake booster thrust transfer mechanism of claim 6, wherein: the support member (6) is provided with a reinforcing rib (603) for reinforcing the convex portion (602).

9. The electric brake booster thrust transfer mechanism of claim 4, wherein: the guide frame (5) is connected with the supporting piece (6) in an inserting mode.

10. The electric brake booster thrust transfer mechanism of claim 4, wherein: and a sensor abdicating hole (606) is formed in the support piece (6).

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