CN113653754A

CN113653754A - Guiding rotation-proof piece and pressure control unit

Info

Publication number: CN113653754A
Application number: CN202110931621.1A
Authority: CN
Inventors: 张�杰; 李磊; 卜祥阳
Original assignee: China Automotive Innovation Co Ltd
Current assignee: China Automotive Innovation Co Ltd
Priority date: 2021-03-31
Filing date: 2021-08-13
Publication date: 2021-11-16

Abstract

The invention relates to the field of automobile braking systems, and discloses a guide anti-rotation part and a pressure control unit. According to the guide anti-rotation piece and the pressure control unit provided by the invention, the pre-alignment port is formed in the peripheral wall of the guide anti-rotation piece, so that an assembling worker can conveniently rotate the moving piece relative to the guide anti-rotation piece by screwing the piston according to the relative position of the pre-alignment port and the second guide part on the peripheral surface of the moving piece, so that the second guide part is aligned with the first guide part, and the assembling efficiency between the guide anti-rotation piece and the moving piece is greatly improved.

Description

Guiding rotation-proof piece and pressure control unit

Technical Field

The invention relates to the field of automobile braking systems, in particular to a guide anti-rotation part and a pressure control unit.

Background

The pressure control unit in the electromechanical hydraulic servo brake system is mainly divided into two types, the first type is that a screw is driven to rotate through a motor to push a lead screw to move, the lead screw is connected with a piston, the piston is driven to linearly move in a cylinder body of a brake cylinder to be pressurized or decompressed by the movement of the lead screw, and the pressure control unit prevents the lead screw from rotating by limiting two axial ends of the lead screw. The second type is that the screw rod is driven by the motor to rotate so as to push the nut to move, the nut is connected with the piston, the piston is driven to linearly move in the cylinder body of the brake cylinder by the movement of the nut so as to be pressurized or decompressed, and the control unit prevents the nut from rotating by limiting the nut so as to bear the torque of the rotation of the nut.

In order to limit the nut, a guiding rotation-preventing member is fixed to a fixing member such as a valve body or a cylinder body, one of the guiding rotation-preventing member and the nut is provided with a guiding groove, the other is provided with a guiding tooth, and the guiding groove and the guiding tooth are in inserting fit along the axial direction of the nut, so that the nut is prevented from rotating relative to the guiding rotation-preventing member.

When assembling the pressure control unit, two assembling structures are generally assembled first, and then the two assembling structures are assembled. Specifically, a nut is firstly installed on a lead screw to form a nut lead screw assembly, the nut of the nut lead screw assembly is in threaded connection with a piston, and a lead screw of the nut lead screw assembly is fixedly connected with an output shaft of a motor through a screw to form a first assembly structure; fixing the valve body, the anti-rotation piece and the cylinder body of the brake cylinder to form a second assembly structure; and then fixing the second assembly structure, axially moving the first assembly structure to axially insert the anti-rotation teeth and the anti-rotation grooves, and assembling the first assembly structure and the second assembly structure together to complete the installation of the pressure control unit.

However, the first assembly structure is usually located in the casing of the motor, when the nut and the anti-rotation member are assembled, the nut needs to be rotated to expose the nut out of the casing of the motor, and then the positions of the guide groove and the guide tooth are observed by human eyes to align the guide groove and the guide tooth, so that the guide tooth is inserted into the guide groove, and the assembly efficiency is low.

Disclosure of Invention

An object of the present invention is to provide a guide rotation preventing member capable of aligning guide teeth and guide grooves during assembly of a pressure control unit, thereby improving assembly efficiency.

In order to achieve the purpose, the invention adopts the following technical scheme:

prevent changeing in the direction, one in screw and the lead screw of lead screw subassembly is as the moving member, and another is as rotating the piece, prevent changeing in the direction and be used for restricting the moving member rotates, prevent changeing in the direction and include:

the device comprises a body, a positioning device and a positioning device, wherein a pre-alignment port is arranged on the body;

the fixing part is arranged on the body and is connected with the fixing part of the pressure control unit so as to limit the movement of the body;

the first guide part is arranged on the inner peripheral wall of the body and matched with the second guide part on the outer peripheral surface of the moving part so as to limit the rotation of the moving part and enable the moving part to have axial freedom.

As a preferred technical scheme of the guide anti-rotation part, the fixing part is arranged on the outer side of one end of the body, and the pre-alignment openings are formed in the end part of the other end of the body.

As a preferred technical solution of the above-mentioned guiding rotation-preventing member, the pre-alignment openings and the first guiding portions are arranged in a one-to-one correspondence;

or the like, or, alternatively,

at least one pre-alignment port is formed between every two adjacent first guide parts.

As a preferable technical solution of the above guiding rotation-preventing member, the pre-alignment port extends along the axial direction of the body, and the width of the opening of the pre-alignment port far from the end of the body is smaller than the width of the opening of the pre-alignment port near the end of the body.

As a preferable technical solution of the above-mentioned guiding rotation-preventing member, a fine alignment unit is provided on the outer peripheral wall of the body, and the first guiding portion is provided with the fine alignment unit located in the same radial direction as the first guiding portion.

As a preferable technical solution of the above-mentioned guiding rotation-preventing member, the fine alignment unit is any one of a groove, a rib, and a mark line provided on the outer circumferential wall of the body.

As a preferable technical solution of the above-mentioned guiding rotation-preventing member, the first guiding portion includes a guiding tooth formed to extend in the axial direction of the body for axial insertion fitting with the second guiding portion (821) using a guiding groove.

As a preferred technical scheme of the guide anti-rotation piece, the outer wall of the fixing part is provided with a knurled structure for circumferential limiting of the body.

As an optimal technical scheme of above-mentioned direction rotation-proof piece, the periphery wall of fixed part is equipped with spacing recess, be used for with the mounting crimping cooperation, in order to right the body carries out axial spacing.

As a preferred technical scheme of the guide anti-rotation piece, the limiting groove is formed in the middle of the knurled structure.

Another object of the present invention is to provide a pressure control unit, which can improve the assembly efficiency of the pressure control unit and reduce the assembly cost by using the above-mentioned guiding rotation-preventing member.

a pressure control unit comprising:

a power source outputting power;

the screw rod assembly comprises a screw rod connected with the power source and a screw nut in threaded fit with the screw rod and used for converting the rotating force of the power source into linear motion force, and a second guide part is arranged on the outer side of the screw nut;

the guide anti-rotation part is sleeved on the circumferential outer side of the nut, and the second guide part is matched with the first guide part and used for limiting the rotation of the nut;

the pressure source comprises a piston and a cylinder body, the piston is connected with the nut, and the piston does reciprocating linear motion along the axis direction of the piston to output pressure;

and one end of the fixing piece is connected with the cylinder body, and the guide anti-rotation piece is fixedly connected with the cylinder body or the fixing piece.

As a preferable technical solution of the above pressure control unit, the fixing member is press-fitted with the guide rotation preventing member.

The invention has the beneficial effects that: according to the guide anti-rotation piece and the pressure control unit provided by the invention, the pre-alignment port is formed in the peripheral wall of the guide anti-rotation piece, so that an assembling worker can conveniently rotate the moving piece relative to the guide anti-rotation piece by screwing the piston according to the relative position of the pre-alignment port and the second guide part on the peripheral surface of the moving piece, so that the second guide part is aligned with the first guide part, and the assembling efficiency between the guide anti-rotation piece and the moving piece is greatly improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

FIG. 1 is a partial cross-sectional view of a pressure control unit of an embodiment of the present invention;

FIG. 2 is a schematic structural view of a fastener provided in accordance with an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a lead screw assembly provided in an embodiment of the present invention;

FIG. 4 is a schematic structural view of a guide anti-rotation member provided in an embodiment of the present invention;

FIG. 5 is a side view of a guide anti-rotation member provided in accordance with an embodiment of the present invention;

FIG. 6 is a front view of a guide anti-rotation member provided in accordance with an embodiment of the present invention;

fig. 7 is a sectional view of a guide rotation-preventing member provided by an embodiment of the present invention.

In the figure:

1. a first guide portion; 2. a fixed part; 3. a straight-line knurled section; 4. a body; 41. a fine alignment unit; 5. pre-alignment ports; 6. an annular groove;

7. a fixing member; 71. an anti-rotation member mounting hole;

8. a lead screw assembly; 81. a lead screw; 82. a nut; 821. a second guide portion;

9. a guide rotation preventing member; 10. perforating holes;

101. a cylinder body; 102. a piston; 103. a brake chamber.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. 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 associated with the present invention are shown in the drawings.

As shown in fig. 1, the present embodiment provides a pressure control unit applied to a brake system, by which brake oil is supplied to cause the brake system to generate a braking force.

The pressure control unit comprises a pressure source, the pressure source comprises a cylinder body 101 with an opening at one end, a brake cavity 103 is arranged on the cylinder body 101, a piston 102 which is connected with the inner wall of the brake cavity 103 in a sliding mode is arranged in the brake cavity 103, sealing parts such as a sealing ring and the like are arranged between the piston 102 and the inner wall of the brake cavity 103, brake oil is arranged in the brake cavity 103, and the sealing parts can effectively prevent the brake oil in the brake cavity 103 from leaking between the piston 102 and the inner wall of the brake cavity 103. The cylinder 101 is provided with an oil hole communicated with the brake chamber 103, and when the piston 102 moves towards the direction close to the bottom wall of the brake chamber 103, the oil hole plays a role in pressurizing brake oil in the brake chamber 103, and the pressurized brake oil can be output through the oil hole, so that the brake system can generate braking force. During the process that the piston 102 moves away from the bottom of the brake chamber 103, the brake oil in the brake chamber 103 is decompressed, and the external brake oil may enter the brake chamber 103 through the oil hole to release the brake of the brake system.

The pressure control unit further comprises a control valve for controlling the connection or disconnection of a brake oil passage communicated with the oil hole in the brake system. Specifically, as shown in fig. 1 and 2, the outer wall of the cylinder block 101 is provided with an annular oil groove, and both ends of the oil hole are respectively communicated with the annular oil groove and the brake chamber 103; the control valve comprises a hydraulic manifold block, wherein an anti-rotating part mounting hole 71 and an oil inlet and outlet channel communicated with the anti-rotating part mounting hole 71 are formed in the hydraulic manifold block, one end of the cylinder body 101 is fixedly mounted in the anti-rotating part mounting hole 71, the annular oil groove is opposite to an opening at one end of the oil inlet and outlet channel, and therefore the oil hole is communicated with the brake oil channel through the annular oil groove and the oil inlet and outlet channel.

During the process that the piston 102 moves towards the direction close to the bottom wall of the brake cavity 103, the brake oil in the brake cavity 103 enters the oil inlet and outlet channels through the oil hole and the annular oil groove. Illustratively, one end of the cylinder block 101 is inserted into the rotation preventing member mounting hole 71 and fixedly connected by press-fitting such as caulking, so that the annular oil groove faces an opening at one end of the oil inlet/outlet passage. In other embodiments, the cylinder 101 may be fixedly connected to the hydraulic manifold by a fastener such as a screw.

As shown in fig. 1 and 3, in order to achieve the reciprocating movement of the piston 102, the pressure brake unit further includes a lead screw assembly 8 for driving the piston 102 to move. Specifically, the screw assembly 8 includes a nut 82 and a screw 81 engaged therewith, in this embodiment, the nut 82 serves as a moving member, the screw 81 serves as a rotating member, one end of the screw 81 is connected to a power source such as a motor, etc., the nut 82 is sleeved outside the screw 81 and is fixedly connected to the piston 102, the fixing member 7 is fixed with a guiding rotation-preventing member 9, the guiding rotation-preventing member 9 limits the nut 82 to rotate relative to the fixing member 7, and in the process of the power source driving the screw 81 to rotate, the nut 82 drives the piston 102 to move. In other embodiments, the nut 82 may be used as a rotating member, the lead screw 81 may be used as a moving member, the power source is used to drive the nut 82 to rotate, one end of the lead screw 81 is fixedly connected to the piston 102, and the lead screw 81 is limited to rotate relative to the fixing member 7 by the guiding rotation-preventing member 9, so that the lead screw 81 drives the piston 102 to move. In order to improve the smoothness of the rotation, the screw assembly 8 may have a ball screw structure.

As shown in fig. 3 and 7, in order to limit the rotation of the nut 82 relative to the fixing member 7 through the guiding rotation-preventing member 9, the guiding rotation-preventing member 9 is fixedly connected to the fixing member 7, the guiding rotation-preventing member 9 is provided with a first guiding portion 1, the nut 82 is provided with a second guiding portion 821, the second guiding portion 821 is axially inserted and matched with the first guiding portion 1 to limit the rotation of the nut 82 relative to the guiding rotation-preventing member 9, and then the purpose of limiting the rotation of the nut 82 relative to the fixing member 7 is achieved. It should be noted that the fixing member 7 in this embodiment refers to the above-mentioned hydraulic manifold, and in other embodiments, the guide rotation preventing member 9 may be fixedly connected to the cylinder 101.

In this embodiment, the first guide portion 1 includes a guide tooth formed to extend in the axial direction of the body 4, and the second guide portion 821 is a guide groove. Specifically, the guide rotation-preventing member 9 includes a body 4, and the first guide portion 1 is provided on an inner peripheral wall of the body 4, and is axially inserted and fitted with a guide tooth and a guide groove to limit rotation of the nut 82 and to provide the nut 82 with an axial degree of freedom. In other embodiments, the first guide portion 1 may be a guide groove, and the second guide portion 821 may be a guide tooth.

The nut 82 is a machined part, the guide rotation-preventing part 9 is an extrusion part, and compared with the situation that the guide teeth are arranged on the nut 82 and the guide grooves are arranged on the guide rotation-preventing part 9, the guide grooves are arranged on the nut 82, and the guide teeth are arranged on the guide rotation-preventing part 9, the machining of the nut 82 and the guide rotation-preventing part 9 can be simplified. Optionally, the guide rotation-preventing part 9 is an extrusion part made of an aluminum profile through an extrusion process, so that the light weight and low-cost design of the guide rotation-preventing part 9 is realized; in order to improve the strength and wear resistance of the guide rotation-preventing member 9, the surface of the guide rotation-preventing member 9 is subjected to anodic oxidation treatment. In order to ensure that the axial movement distance of the screw nut 82 meets the requirement, the guide groove is an axial through groove. As for the cross-sectional shape of the guide groove in the direction perpendicular to the extending direction thereof, it may be an arc, a rectangle, a triangle, a trapezoid, or the like, and it is only necessary to enable the guide groove to be axially inserted and fitted with the guide tooth to play a role of restricting the rotation of the nut 82 relative to the fixing member 7 by the guide rotation-preventing member 9, and no specific limitation is provided herein.

More specifically, be equipped with the through-hole 10 that is used for wearing to establish piston 102 on the body 4, through-hole 10 is the through-hole, and screw 82 includes first connecting portion, and first connecting portion stretches into from the one end of through-hole 10, and the one end of piston 102 stretches into and with first connecting portion screw-thread fit from the other end of through-hole 10. Illustratively, the outer peripheral wall of the first connecting portion is provided with an external thread that is threadedly engaged with the piston 102.

The nut 82 further includes a second connecting portion coaxial with the first connecting portion, the outer peripheral wall of the second connecting portion is provided with the guide groove, and the inner peripheral wall of the through hole 10 is provided with the guide teeth. Optionally, the number of the guide grooves is at least two, the at least two guide grooves are uniformly distributed along the circumferential direction of the outer circumferential wall of the second connecting portion, and the guide grooves and the guide teeth are in one-to-one correspondence, so that the stress on the screw 82 is uniform. Illustratively, the guide grooves are provided in three.

In order to fixedly connect the guiding rotation-preventing part 9 and the fixing part 7, in the embodiment, one end of the guiding rotation-preventing part 9 is in press fit with the fixing part 7, and exemplarily, the guiding rotation-preventing part 9 is riveted and fixed with the fixing part 7, so as to prevent the guiding rotation-preventing part 9 from rotating. Specifically, referring to fig. 1 again, one end of the body 4 is inserted into the anti-rotation piece mounting hole 71, a portion of the body 4 inserted into the anti-rotation piece mounting hole 71 is denoted as a fixing portion 2, and the fixing portion 2 is riveted and fixed with the anti-rotation piece mounting hole. In other embodiments, the fixing manner of the guiding rotation-preventing member 9 and the fixing member 7 is not limited to riveting, and may also be a connection manner by using a fastener such as welding, pressing interference or screw, and the like, which will not be described in detail herein.

Optionally, a knurling structure is arranged on the fixing portion 2 before riveting for performing a circumferential phase on the fixing portion 2, so as to improve the firmness and reliability of the fixing portion 2 and the fixing member 7 after riveting and fixing. The knurling structure may be a straight knurling section or an inclined knurling section, and preferably a straight knurling section is used. In order to further improve the firmness and reliability of the fixed part 2 and the fixed part 7 after riveting, the peripheral wall of the fixed part 2 is provided with a limiting groove, the cylinder body 101 is made of an aluminum alloy part, and in the process of riveting and fixing the fixed part 2 and the fixed part 7, part of the fixed part 7 is extruded and deformed into the limiting groove to form an axial limiting part, so that the guide anti-rotation part 9 is axially limited. In this embodiment, the limiting groove is an annular groove 6, and the annular groove 6 is disposed in the middle of the straight-line knurled portion 3. In other embodiments, a limiting groove may be further disposed on the inner wall of the anti-rotation member mounting hole 71, so that part of the guiding anti-rotation member 9 is extruded and deformed into the limiting groove to form an axial limiting portion during the riveting and fixing process, but at this time, a material for manufacturing the guiding anti-rotation member 9 needs to be limited, such as an aluminum alloy, so that the guiding anti-rotation member 9 can be extruded and deformed.

Referring to fig. 1, a brief process of assembling the above-described pressure control unit is as follows: a nut 82 in the screw assembly 8 is in threaded connection with a piston 102, and a screw 81 in the screw assembly 8 is fixedly connected with a power source through a screw to form a first assembly structure; the fixing piece 7 and the guide anti-rotation piece 9 are respectively and fixedly connected with the cylinder body 101 to form a second assembly structure, and the second assembly structure is fixed; and applying external force to the first assembly structure to enable the first assembly structure to move towards the side of the second assembly structure along the axial direction of the screw rod assembly 8 so as to axially insert the guide teeth and the guide grooves, and enabling the first assembly structure and the second assembly structure to be assembled together to complete the assembly of the pressure control unit.

The power source is provided with a shell, the nut 82 is completely arranged in the shell, and one end, far away from the nut 82, of the piston 102 in the first assembly structure extends out of the shell and then is connected to the cylinder body 101, so that the structure of the first assembly structure is simplified, and the cost is reduced. Since the nut 82 is completely disposed in the housing, in the prior art, when the nut 82 and the guiding rotation-preventing member 9 are connected, the piston 102 needs to be rotated to drive the nut 82 to rotate, so that the nut 82 is exposed, the guiding groove faces the guiding tooth through observation by human eyes, and finally, an external force is applied to the first assembly structure to move the first assembly structure to the side of the second assembly structure along the axial direction of the lead screw assembly 8, so that the guiding tooth is inserted into the guiding groove. However, alignment of the guide grooves and the guide teeth by human eye observation results in inefficient assembly of the entire pressure control unit. In order to solve the above technical problem, referring to fig. 1 to 7, the present embodiment provides a guiding rotation-preventing member 9 applied to the above pressure control unit, and the outer peripheral wall of the body 4 is provided with a pre-alignment opening 5.

In the process of assembling the guide teeth and the guide grooves, an assembler can firstly use the relative position of the pre-alignment opening 5 and the guide grooves as a reference, and the rotary piston 102 drives the screw 82 to rotate relative to the guide anti-rotation part 9 so as to preliminarily align the guide grooves and the guide teeth.

Exemplarily, the fixing portion 2 is disposed at an outer side of one end of the body 4, the end portion of the other end is provided with a plurality of pre-alignment openings 5, and at least one pre-alignment opening 5 is disposed between every two adjacent first guiding portions 1. The pre-alignment opening 5 is an opening penetrating through a sidewall of the body 4, and the pre-alignment opening 5 is disposed adjacent to the first guide part 1 for observing the assembly of the second guide part 821 with the first guide part 1.

In this embodiment, the number of the pre-alignment ports 5 is correspondingly matched with that of the first guide portions 1, for example, the pre-alignment ports 5 are arranged in one-to-one correspondence with the first guide portions 1; or at least two pre-alignment ports 5 are arranged between every two first guide parts 1.

The pre-alignment port 5 extends along the axial direction of the body 4, and the opening width of the end part of the pre-alignment port 5 far away from the body 4 is smaller than the opening width of the end part of the pre-alignment port 5 close to the body 4. The pre-alignment port 5 is approximately a V-shaped groove, and two opposite sides of the V-shaped groove are in smooth transition connection. The number of the pre-alignment ports 5 can be any number from one to ten, illustratively, three pre-alignment ports 5 are arranged, the three pre-alignment ports 5 are distributed equally, an opening included angle between two opposite side edges of each pre-alignment port 5 is larger than 60 degrees, and an assembler can align the guide teeth and the guide grooves conveniently by using the pre-alignment ports 5. In other embodiments, the plurality of pre-alignment holes 5 may also be distributed in an angle-biased manner, that is, the plurality of pre-alignment holes 5 are distributed along the circumferential direction of the body 4 and are not uniformly distributed. In addition, the arrangement of the pre-aligning port 5 can also realize light weight design on the premise of meeting the anti-rotation strength.

Furthermore, the outer peripheral wall of the main body 4 is provided with a fine alignment unit 41, and the guide teeth are provided with the fine alignment unit 41 located in the same radial direction. Optionally, each guiding tooth is provided with a fine alignment unit 41 located in the same radial direction. For example, the guide teeth and the fine alignment units 41 are respectively disposed on the radially inner and outer sides of the sidewall of the body 4 in a one-to-one correspondence. Specifically, the fine alignment unit 41 may be an alignment groove extending in the same direction as the guide teeth, or the fine alignment unit 41 may also be a rib extending in the same direction as the guide teeth, or the fine alignment unit 41 may also be a marking line extending in the same direction as the guide teeth.

As shown in fig. 1, 3 and 4, in the process of assembling the guide teeth and the guide grooves, an assembler can firstly observe the relative positions of the guide teeth and the guide grooves through the pre-alignment port 5, and the rotary piston 102 drives the nut 82 to rotate relative to the guide anti-rotation member 9, so as to initially align the guide grooves and the guide teeth; when the axial distance between the guide groove and the guide tooth is small, the fine alignment unit 41 is used as a reference for precise adjustment, the rotary piston 102 drives the screw 82 to rotate relative to the guide anti-rotation part 9, the guide groove and the guide tooth are precisely aligned, so that the guide tooth can enter the guide groove, and the assembly efficiency of the pressure control unit is further improved.

Further, above-mentioned body 4 is thin-walled structure, can realize lightweight design under the prerequisite that satisfies anti-rotation strength, has practiced thrift the design space simultaneously, makes things convenient for the design of other structures.

Furthermore, the guiding rotation-preventing part 9 adopts a powder metallurgy process, so that the forming process is simple, the manufacturing cost is low, and the wear resistance of parts is good. In this embodiment, graphite is added to the material of the guiding rotation-preventing member 9 to improve the wear resistance of the guiding rotation-preventing member 9. It should be noted that the graphite-containing material used for machining the anti-rotation guide member 9 is prior art, and the composition of the material is not specifically described here.

The assembly process of the pressure control unit comprises the following steps:

s1, fixedly connecting a nut 82 of the lead screw assembly 8 with a piston 102, and connecting a lead screw 81 of the lead screw assembly 8 with a power source to form a first assembly structure; and fixedly connecting the guide rotation-preventing part 9 with the fixing part 7 to form a second assembly structure, and fixing the second assembly structure.

S2, the rotary piston 102 drives the nut 82 to rotate, so that the nut 82 is exposed, and external force is continuously applied to the first assembly structure to enable the first assembly structure to move towards the second assembly structure along the axial direction of the lead screw assembly 8.

And S3, when the axial distance between the first assembly structure and the second assembly structure is greater than the preset distance, preliminarily aligning the guide groove and the guide tooth by referring to the relative positions of the pre-alignment port 5 and the guide groove.

And S4, when the axial distance between the first assembly structure and the second assembly structure is smaller than or equal to the preset distance, precisely aligning the guide grooves and the guide teeth by referring to the relative positions of the precise alignment unit 41 and the guide grooves, and enabling the guide grooves to be aligned to the guide teeth so as to insert the guide teeth into the corresponding guide grooves.

And S5, stopping applying external force to the first assembly structure when the first assembly structure cannot move to the side of the second assembly structure along the axial direction of the lead screw assembly 8, and connecting the shell and the hydraulic manifold block through a fastener to complete the assembly of the pressure control unit.

It should be noted that, the axial distance between the first assembling structure and the second assembling structure refers to the axial distance between the opposite side walls of the housing and the fixing member 7, and during the assembling process, the axial distance between the opposite side walls of the housing and the fixing member 7 is gradually reduced until the housing abuts against the fixing member 7, the guide teeth are confirmed to enter the guide grooves, the external force is stopped to be applied to the first assembling structure, and the housing and the fixing member 7 are fixed by the fastening member, so that the assembling of the pressure control unit is completed.

The specific value of the preset distance can be determined according to the assembly experience of an assembler, and it can be understood that when the first assembly structure and the second assembly structure are closer to each other, the assembler can precisely align the guide grooves and the guide teeth with reference to the precise alignment unit 41, and the precise alignment is not specifically limited herein.

It should 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. And are neither required nor 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.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 in specific cases to those skilled in the art.

Claims

1. The lead screw assembly is characterized in that the lead screw assembly comprises a lead anti-rotation part, one of a screw nut (82) and a lead screw (81) of the lead screw assembly (8) is used as a moving part, the other one of the screw nut (82) and the lead screw (81) is used as a rotation part, the lead anti-rotation part (9) is used for limiting the rotation of the moving part in the screw nut (82) and the lead screw (81) of the lead screw assembly (8), and the lead screw assembly comprises:

the device comprises a body (4), wherein a pre-alignment port (5) is formed in the body (4);

the fixing part (2) is arranged on the body (4) and connected with the fixing part (7) to limit the movement of the body (4);

the first guide part (1) is arranged on the inner peripheral wall of the body (4), and the first guide part (1) is matched with the second guide part (821) on the outer peripheral surface of the moving part so as to limit the rotation of the moving part and enable the moving part to have axial freedom degree.

2. The guiding and rotation-preventing part as claimed in claim 1, wherein the fixing part (2) is provided on the outer side of one end of the body (4), and the pre-alignment openings (5) are provided on the end of the other end.

3. The guide anti-rotation part according to claim 2, characterized in that the pre-alignment ports (5) are arranged in one-to-one correspondence with the first guide parts (1);

alternatively, the first and second electrodes may be,

at least two pre-alignment openings (5) are formed between every two adjacent first guide parts (1).

4. Guide anti-rotation part according to claim 2 or 3, characterized in that the pre-alignment opening (5) extends in the axial direction of the body (4), and the opening width of the pre-alignment opening (5) at the end away from the body (4) is smaller than the opening width of the pre-alignment opening (5) at the end close to the body (4).

5. The guide anti-rotation part according to claim 1, characterized in that the outer peripheral wall of the body (4) is provided with fine alignment units (41), and the fine alignment units (41) located in the same radial direction are provided on the radial outer side of the first guide part (1).

6. The guide rotation-proof part according to claim 5, characterized in that the fine alignment unit (41) is any one of a groove, a rib and a marking line provided on the outer circumferential wall of the body (4).

7. The guide anti-rotation member according to claim 1, characterized in that the first guide portion (1) includes a guide tooth formed extending in the axial direction of the body (4) for axial insertion-fit with the second guide portion (821) employing a guide groove.

8. An anti-rotation guide part according to claim 1, characterized in that the outer wall of the fixing part (2) is provided with a knurled structure for circumferential limitation of the body (4).

9. The guide anti-rotation member according to claim 8, characterized in that the peripheral wall of the fixing portion (2) is provided with a limiting groove for press-fitting engagement with the fixing member (7) to axially limit the body (4).

10. The guide anti-rotation member according to claim 9, wherein the limit recess is provided in a middle portion of the knurled structure.

11. A pressure control unit, comprising:

a power source outputting power;

the screw rod assembly comprises a screw rod (81) connected with the power source and a nut (82) in threaded fit with the screw rod (81), the screw rod assembly is used for converting the rotating force of the power source into linear motion force, and a second guide part (821) is arranged on the outer side of the nut (82);

the guiding anti-rotation part (9) is the guiding anti-rotation part (9) according to any one of claims 1 to 10, is sleeved on the circumferential outer side of the screw nut (82), and the second guiding part (821) is matched with the first guiding part (1) and is used for limiting the rotation of the screw nut (82);

the pressure source comprises a piston (102) and a cylinder body (101), the piston (102) is connected with the screw nut (82), and the piston (102) does reciprocating linear motion along the axial direction thereof to output pressure;

one end of the fixing piece (7) is connected with the cylinder body (101), and the guiding anti-rotation piece (9) is fixedly connected with the cylinder body (101) or the fixing piece (7).

12. Pressure control unit according to claim 11, characterized in that the fixing element (7) is press-fitted with the guide rotation-prevention element (9).