阅读说明：本技术 用于线控电子液压制动系统的齿条防转装置及汽车 (Rack anti-rotation device for wire-controlled electronic hydraulic braking system and automobile ) 是由 白俊涛 聂小勇 李清平 王峰 舒强 龙荣威 李世鹏 于 2020-04-24 设计创作，主要内容包括：本发明公开了一种用于线控电子液压制动系统的齿条防转装置及汽车,该防转装置包括齿轮轴、齿条、滑套和壳体；所述齿轮轴上设有斜齿,所述齿条与所述齿轮轴上的斜齿啮合；所述滑套套设在所述齿条的外侧,所述壳体用于承载所述滑套,所述滑套与所述壳体连接；所述齿条上与所述滑套相接触的一面设有第一导向机构,所述滑套上设有第二导向机构,所述第一导向机构与所述第二导向机构的位置对应,且所述第一导向机构与所述第二导向机构相互配合,以限制所述齿条绕自身轴线的转动,所述第一导向机构与所述第二导向机构可相对滑动。本发明能够解决现有技术中齿轮轴与齿条在啮合时,实际接触面积会因为齿条转动而减少、导致齿面强度降低的问题。(The invention discloses a rack anti-rotation device for a wire-controlled electronic hydraulic braking system and an automobile, wherein the anti-rotation device comprises a gear shaft, a rack, a sliding sleeve and a shell; the gear shaft is provided with helical teeth, and the rack is meshed with the helical teeth on the gear shaft; the sliding sleeve is sleeved on the outer side of the rack, the shell is used for bearing the sliding sleeve, and the sliding sleeve is connected with the shell; the sliding sleeve is provided with a first guide mechanism on one side, which is contacted with the sliding sleeve, and a second guide mechanism is arranged on the sliding sleeve, the first guide mechanism corresponds to the second guide mechanism in position, and the first guide mechanism is matched with the second guide mechanism to limit the rotation of the rack around the axis of the rack, and the first guide mechanism and the second guide mechanism can slide relatively. The invention can solve the problem that the actual contact area is reduced due to the rotation of the rack when the gear shaft is meshed with the rack in the prior art, so that the strength of the tooth surface is reduced.)

1. A rack anti-rotation device for a wire-controlled electronic hydraulic braking system is characterized by comprising a gear shaft, a rack, a sliding sleeve and a shell;

the gear shaft is provided with helical teeth, and the rack is meshed with the helical teeth on the gear shaft;

the sliding sleeve is sleeved on the outer side of the rack, the shell is used for bearing the sliding sleeve, and the sliding sleeve is connected with the shell;

the sliding sleeve is provided with a first guide mechanism on one side, which is contacted with the sliding sleeve, and a second guide mechanism is arranged on the sliding sleeve, the first guide mechanism corresponds to the second guide mechanism in position, and the first guide mechanism is matched with the second guide mechanism to limit the rotation of the rack around the axis of the rack, and the first guide mechanism and the second guide mechanism can slide relatively.

2. The rack anti-rotation device for the by-wire electro-hydraulic brake system according to claim 1, wherein the first guide means is a guide rib and the second guide means is a guide groove, the guide rib being adapted to be inserted into the guide groove.

3. The rack anti-rotation device for the brake-by-wire electronic hydraulic system according to claim 2, wherein a receiving groove is provided on a surface of the housing contacting the sliding sleeve, and the guide groove is located in the receiving groove.

4. The rack anti-rotation device for the brake-by-wire electro-hydraulic system according to claim 2, wherein the guide rib is located at a rear or side of the rack.

5. The rack anti-rotation device for the by-wire electro-hydraulic brake system according to claim 1, wherein the first guide means is a guide groove, and the second guide means is a guide rib for insertion into the guide groove.

6. The rack anti-rotation device for the brake-by-wire electro-hydraulic system according to claim 5, wherein the guide groove is located at a rear or side of the rack.

7. The rack anti-rotation device for the electronic-hydraulic brake system by wire according to claim 1, wherein the first guide means is a guide rib, the second guide means is a through hole, a guide groove is provided on the housing at a position opposite to the through hole, and the guide rib passes through the through hole and is inserted into the guide groove.

8. The rack anti-rotation device for the brake-by-wire electronic hydraulic system according to claim 1, wherein the first guide mechanism is a first guide groove and a flat key, the second guide mechanism is a second guide groove, the first guide groove and the second guide groove correspond in position, and both ends of the flat key are respectively inserted into the first guide groove and the second guide groove.

9. The rack anti-rotation device for the by-wire electro-hydraulic brake system according to claim 1, wherein the sliding sleeve is inserted into the housing by interference fit.

10. An automobile, characterized by comprising the rack anti-rotation device for the by-wire electronic hydraulic brake system according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of automobile parts, in particular to a rack anti-rotation device for a wire-controlled electronic hydraulic braking system and an automobile.

Background

The drive-by-wire electronic hydraulic brake system is an important structure in an automobile, most of the drive-by-wire electronic hydraulic brake systems adopt a transmission mechanism of a worm gear and a gear shaft rack, and the existing drive-by-wire electronic hydraulic brake systems generally adopt a transmission scheme of the worm gear and the gear shaft rack. Wherein, the worm gear worm transmission can design higher reduction ratio, makes the power of motor output reduce speed fast and increase the turn round, provides great piston thrust. And the gear shaft rack transmission can convert the rotary motion output by the motor into linear motion to push the master cylinder piston to reciprocate.

In general, to achieve a high load-bearing capacity of the transmission, the gear shaft is designed as helical teeth. In the meshing process of the bevel gear and the rack, a component force is generated in the axial direction of the rack by a normal force generated by the tooth surface. The component force can cause the circular rack to rotate around the axis of the circular rack, namely, the rack can rotate for a certain angle under the action of the axial component force when the gear shaft transmits power to the rack. This results in that the actual contact area is reduced by the rotation of the rack when the pinion shaft and the rack are engaged with each other, and the tooth surface strength is reduced when the pinion shaft and the rack are engaged with each other, which is likely to cause tooth root fracture or fatigue pitting.

Disclosure of Invention

One objective of the present invention is to provide a rack rotation prevention device for a brake-by-wire electronic hydraulic system, so as to solve the problem that in the prior art, when a gear shaft and a rack are meshed, the actual contact area is reduced due to the rotation of the rack, which results in the reduction of the strength of a tooth surface.

A rack anti-rotation device for a wire-controlled electronic hydraulic brake system comprises a gear shaft, a rack, a sliding sleeve and a shell;

the gear shaft is provided with helical teeth, and the rack is meshed with the helical teeth on the gear shaft;

the sliding sleeve is sleeved on the outer side of the rack, the shell is used for bearing the sliding sleeve, and the sliding sleeve is connected with the shell;

the sliding sleeve is provided with a first guide mechanism on one side, which is contacted with the sliding sleeve, and a second guide mechanism is arranged on the sliding sleeve, the first guide mechanism corresponds to the second guide mechanism in position, and the first guide mechanism is matched with the second guide mechanism to limit the rotation of the rack around the axis of the rack, and the first guide mechanism and the second guide mechanism can slide relatively.

According to the rack rotation preventing device for the wire-controlled electronic hydraulic braking system, when the transmission mechanism transmits power to enable the gear shaft and the rack to be meshed with each other, the sliding sleeve applies a torque to the rack through the matching of the first guide mechanism and the second guide mechanism, and the torque can offset the torque which is generated by meshing component force of the gear shaft and the rack and enables the rack to rotate around the axis of the rack, so that the degree of freedom of the rack to rotate around the axis of the rack in reciprocating motion is limited, the rack is prevented from deflecting in the reciprocating motion process, the problem that the tooth surface strength is reduced due to the fact that the contact area is reduced when the gear shaft is meshed with the rack is solved, and the working safety coefficient of the gear shaft and.

In addition, the rack anti-rotation device for the by-wire electronic hydraulic brake system provided by the invention can also have the following additional technical characteristics:

further, the first guide mechanism is a guide rib, the second guide mechanism is a guide groove, and the guide rib is used for being inserted into the guide groove.

Furthermore, the one side that contacts with the sliding sleeve on the casing is equipped with the holding tank, the direction trench is located in the holding tank.

Further, the guide rib is located on a back or side of the rack.

Further, the first guide mechanism is a guide groove, and the second guide mechanism is a guide rib for inserting into the guide groove.

Further, the guide groove is located on the back or side of the rack.

Further, the first guide mechanism is a guide rib, the second guide mechanism is a through hole, a guide groove is formed in the position, opposite to the through hole, of the shell, and the guide rib penetrates through the through hole and is inserted into the guide groove.

Further, the first guide mechanism is a first guide groove and a flat key, the second guide mechanism is a second guide groove, the first guide groove and the second guide groove are corresponding in position, and two ends of the flat key are respectively inserted into the first guide groove and the second guide groove.

Further, the sliding sleeve is inserted into the shell in an interference fit mode.

Another object of the present invention is to provide a vehicle employing the above rack anti-rotation device for a brake-by-wire electro-hydraulic brake system.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural view of a rack anti-rotation device for a by-wire electro-hydraulic brake system according to a first embodiment of the present invention;

FIG. 2 is a structural schematic view of a rack anti-rotation device for a by-wire electro-hydraulic brake system according to a second embodiment of the present invention;

FIG. 3 is a structural schematic view of a rack anti-rotation device for a brake-by-wire electro-hydraulic brake system according to a third embodiment of the present invention;

fig. 4 is a structural view of a rack anti-rotation device for a by-wire electro-hydraulic brake system according to a fourth embodiment of the present invention.

Detailed Description

In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "up," "down," and the like are for illustrative purposes only and do not indicate or imply that the referenced device or element must be in a particular orientation, constructed or operated in a particular manner, and is not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, a rack rotation preventing device for a by-wire electro-hydraulic brake system according to a first embodiment of the present invention includes a gear shaft 10, a rack 20, a sliding sleeve 30, and a housing 40.

The gear shaft 10 is provided with helical teeth, and the rack 20 is meshed with the helical teeth on the gear shaft 10. The rack 20 is used to push the master cylinder piston, and the gear shaft 10 is used to transmit torque to the rack 20.

The sliding sleeve 30 is sleeved on the outer side of the rack 20, the housing 40 is used for bearing the sliding sleeve 30, and the sliding sleeve 30 is connected with the housing 40.

Specifically, the sliding sleeve is inserted into the housing 40 by an interference fit.

One side of the rack 20, which is in contact with the sliding sleeve 30, is provided with a first guide mechanism 51, the sliding sleeve 30 is provided with a second guide mechanism 52, the first guide mechanism 51 corresponds to the second guide mechanism 52 in position, the first guide mechanism 51 is matched with the second guide mechanism 52 to limit the rotation of the rack 20 around the axis of the rack, and the first guide mechanism 51 and the second guide mechanism 52 can slide relatively.

In this embodiment, the first guiding mechanism 51 is a guiding rib, specifically, the guiding rib is located on the back or the side of the rack 20, and the number of the guiding ribs may be multiple.

The second guide mechanism 52 is a guide groove, and the number of the guide groove is the same as that of the guide rib, and the position of the guide groove corresponds to that of the guide rib. The guide rib is adapted to be inserted into the guide groove,

in addition, the face of the housing 40 contacting the sliding sleeve 30 is provided with an accommodating groove 53, and the guide groove is located in the accommodating groove 53.

When the brake motor receives a brake instruction from the control unit, the motor outputs a torque to drive the gear shaft 10 to rotate, and the gear shaft 10 drives the rack 20 to reciprocate in the sliding sleeve 30, so as to push the piston of the brake master cylinder and establish or release the brake hydraulic pressure. During the reciprocating motion of the rack 20 in the sliding sleeve 30, only two degrees of freedom of sliding along the axial direction and rotating along the axial line exist under the limitation of the sliding sleeve 30. The guide rib on the back or side of the rack 20 is inserted into the guide groove of the sliding sleeve 30, so that the rack 20 can slide along the guide groove but cannot rotate relatively.

According to the above-mentioned rack rotation preventing device for the by-wire electronic hydraulic brake system, when the transmission mechanism transmits power to enable the gear shaft 10 and the rack 20 to be meshed with each other, the sliding sleeve 30 applies a torque to the rack 20 through the cooperation of the first guide mechanism 51 and the second guide mechanism 52, and the torque can counteract the torque which is generated by the gear shaft and rack meshing component force and enables the rack 20 to rotate around the axis thereof, so that the degree of freedom of the rack 20 to rotate around the axis thereof in the reciprocating motion is limited, the rack 20 is prevented from deflecting in the reciprocating motion process, the problem of reduction of tooth surface strength due to reduction of contact area when the gear shaft 10 is meshed with the rack 20 is avoided, and the working safety coefficient of the gear shaft 10 and the rack 20 is improved.

Referring to fig. 2, a rack rotation preventing device for a by-wire electro-hydraulic brake system according to a second embodiment of the present invention includes a gear shaft (not shown), a rack 20, a sliding sleeve 30, and a housing 40.

The gear shaft is provided with helical teeth, and the rack 20 is meshed with the helical teeth on the gear shaft.

The sliding sleeve 30 is sleeved on the outer side of the rack 20, the housing 40 is used for bearing the sliding sleeve 30, and the sliding sleeve 30 is connected with the housing 40.

Specifically, the sliding sleeve is inserted into the housing 40 by an interference fit.

One side of the rack 20, which is in contact with the sliding sleeve 30, is provided with a first guide mechanism 51, the sliding sleeve 30 is provided with a second guide mechanism 52, the first guide mechanism 51 corresponds to the second guide mechanism 52 in position, the first guide mechanism 51 is matched with the second guide mechanism 52 to limit the rotation of the rack 20 around the axis of the rack, and the first guide mechanism 51 and the second guide mechanism 52 can slide relatively.

In this embodiment, the first guiding mechanism 51 is a guiding groove, specifically, the guiding groove is located on the back or the side of the rack 20, and the number of the guiding grooves may be multiple.

The second guiding mechanism 52 is a guiding rib, and the number of the guiding grooves is the same as that of the guiding ribs, and the positions of the guiding grooves correspond to those of the guiding ribs. The guide rib is inserted into the guide groove, so that the rack 20 is limited to rotate around the axis of the rack 20, and the rack 20 can only slide along the axial direction.

According to the above-mentioned rack rotation preventing device for the wire-controlled electronic hydraulic brake system, when the transmission mechanism transmits power to enable the gear shaft and the rack 20 to be meshed with each other, the sliding sleeve 30 applies a torque to the rack 20 through the matching of the first guide mechanism 51 and the second guide mechanism 52, and the torque can counteract the torque which is generated by the gear shaft and rack meshing component force and enables the rack 20 to rotate around the axis thereof, so that the degree of freedom of the rack 20 to rotate around the axis thereof in the reciprocating motion is limited, the rack 20 is prevented from deflecting in the reciprocating motion process, the problem of reduction of tooth surface strength due to reduction of contact area when the gear shaft is meshed with the rack 20 is avoided, and the working safety coefficient of the gear shaft and the rack 20 is improved.

Referring to fig. 3, a rack rotation preventing device for a by-wire electro-hydraulic brake system according to a third embodiment of the present invention includes a gear shaft (not shown), a rack 20, a sliding sleeve 30, and a housing 40.

The gear shaft is provided with helical teeth, and the rack 20 is meshed with the helical teeth on the gear shaft.

The sliding sleeve 30 is sleeved on the outer side of the rack 20, the housing 40 is used for bearing the sliding sleeve 30, and the sliding sleeve 30 is connected with the housing 40.

Specifically, the sliding sleeve is inserted into the housing 40 by an interference fit.

One side of the rack 20, which is in contact with the sliding sleeve 30, is provided with a first guide mechanism 51, the sliding sleeve 30 is provided with a second guide mechanism 52, the first guide mechanism 51 corresponds to the second guide mechanism 52 in position, the first guide mechanism 51 is matched with the second guide mechanism 52 to limit the rotation of the rack 20 around the axis of the rack, and the first guide mechanism 51 and the second guide mechanism 52 can slide relatively.

In this embodiment, the first guide mechanism 51 is a guide rib, the second guide mechanism 52 is a through hole, a guide groove 53 is formed in the housing 40 at a position corresponding to the through hole, and the guide rib passes through the through hole and is inserted into the guide groove 53, so as to limit the rotation of the rack 20 around its axis and ensure that the rack 20 can only slide in the axial direction. The number of the guide ribs, the through holes and the guide grooves 53 is two, and the positions correspond to each other.

According to the above-mentioned rack rotation preventing device for the wire-controlled electronic hydraulic brake system, when the transmission mechanism transmits power to enable the gear shaft and the rack 20 to be meshed with each other, the sliding sleeve 30 applies a torque to the rack 20 through the matching of the first guide mechanism 51 and the second guide mechanism 52, and the torque can counteract the torque which is generated by the gear shaft and rack meshing component force and enables the rack 20 to rotate around the axis thereof, so that the degree of freedom of the rack 20 to rotate around the axis thereof in the reciprocating motion is limited, the rack 20 is prevented from deflecting in the reciprocating motion process, the problem of reduction of tooth surface strength due to reduction of contact area when the gear shaft is meshed with the rack 20 is avoided, and the working safety coefficient of the gear shaft and the rack 20 is improved.

Referring to fig. 4, a rack rotation preventing device for a by-wire electro-hydraulic brake system according to a fourth embodiment of the present invention includes a gear shaft (not shown), a rack 20, a sliding sleeve 30, and a housing 40.

The gear shaft is provided with helical teeth, and the rack 20 is meshed with the helical teeth on the gear shaft.

The sliding sleeve 30 is sleeved on the outer side of the rack 20, the housing 40 is used for bearing the sliding sleeve 30, and the sliding sleeve 30 is connected with the housing 40.

Specifically, the sliding sleeve is inserted into the housing 40 by an interference fit.

One side of the rack 20, which is in contact with the sliding sleeve 30, is provided with a first guide mechanism 51, the sliding sleeve 30 is provided with a second guide mechanism 52, the first guide mechanism 51 corresponds to the second guide mechanism 52 in position, the first guide mechanism 51 is matched with the second guide mechanism 52 to limit the rotation of the rack 20 around the axis of the rack, and the first guide mechanism 51 and the second guide mechanism 52 can slide relatively.

In this embodiment, the first guiding mechanism 51 is a first guiding groove and a flat key 511, the second guiding mechanism 52 is a second guiding groove, an accommodating groove 53 is disposed on a surface of the housing 40 contacting the sliding sleeve 30, and the second guiding groove is located in the accommodating groove 53.

The first guide groove and the second guide groove are corresponding in position, and two ends of the flat key 511 are respectively inserted into the first guide groove and the second guide groove, so that the rack 20 is limited to rotate around the axis of the rack 20, and the rack 20 can only slide along the axial direction.

According to the above-mentioned rack rotation preventing device for the wire-controlled electronic hydraulic brake system, when the transmission mechanism transmits power to enable the gear shaft and the rack 20 to be meshed with each other, the sliding sleeve 30 applies a torque to the rack 20 through the matching of the first guide mechanism 51 and the second guide mechanism 52, and the torque can counteract the torque which is generated by the gear shaft and rack meshing component force and enables the rack 20 to rotate around the axis thereof, so that the degree of freedom of the rack 20 to rotate around the axis thereof in the reciprocating motion is limited, the rack 20 is prevented from deflecting in the reciprocating motion process, the problem of reduction of tooth surface strength due to reduction of contact area when the gear shaft is meshed with the rack 20 is avoided, and the working safety coefficient of the gear shaft and the rack 20 is improved.

In addition, the embodiment of the invention also provides a vehicle, which at least comprises the rack anti-rotation device for the wire-controlled electronic hydraulic brake system of each embodiment.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.