Piston arm tail connecting structure of air supply unit and mounting method

Abstract

The application discloses a piston arm tail connecting structure and mounting method of an air supply unit, which comprises a valve body, a piston rod containing cavity is arranged in the valve body, a first piston arm and a second piston arm are horizontally and oppositely arranged in the piston rod containing cavity, a clamping boss is arranged on the upper side of the opposite end of the first piston arm and the second piston arm, the two clamping bosses are clamped and connected through a clamping spring, a limiting boss is arranged on the side of the upper side of the opposite end of the clamping boss, a clamping groove for clamping the clamping spring is arranged between the clamping boss and the limiting boss, and an inclined surface is arranged on the upper side of the opposite side of the two clamping bosses, when the clamping spring moves to the inclined surface on one of the clamping bosses and contacts the inclined surface, the inclined surface makes the clamping spring rotate around the clamping groove on the other clamping boss. The application can solve the mounting problem that the two piston arms of the existing air supply unit are clamped by a clamping piece.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile air supply unit, in particular to a piston arm tail connecting structure of air supply unit and installation method. BACKGROUND

[0002] With the gradual improvement of the comfort requirements of automobiles, air suspension has been rapidly developed, and the design of electronic products tends to be modular and small-sized. Closed air supply unit ASU is recognized by many customers due to its high charging efficiency and less external gas exchange. In the closed air supply unit, two piston arms are often driven by a motor to do reciprocating motion, and bearings need to be installed between the tails of the two piston arms. In order to clamp the bearings, a clamping piece is needed to clamp the two piston arms. Since the butt joint position between the two piston arms is located in the middle of the valve body, in order to clamp the two piston arms, the valve body is often made into a split structure, or an opening is provided at the bottom of the valve body to install the clamping part. Otherwise, it is difficult to install the clamping piece of the two piston arms from the outside. However, the bottom of the valve body needs to install ECU components. If the opening is provided at the bottom of the valve body for installation, the ECU needs to be frequently disassembled, which will affect the installation accuracy of the electrical components inside the ECU and cause damage to the internal components of the ECU. Therefore, a new piston arm tail connecting structure and corresponding installation method are needed to solve the above problems. SUMMARY

[0003] The present application provides a piston arm tail connecting structure of air supply unit and installation method, which can solve the existing installation problem of clamping the tails of two piston arms in the air supply unit with a clamping piece.

[0004] In order to achieve the above object, the first aspect of the present application provides the following technical scheme: a piston arm tail connecting structure of an air supply unit, comprising a valve body, a piston rod containing cavity is arranged in the valve body, a first piston arm and a second piston arm are horizontally and oppositely arranged in the piston rod containing cavity, a clamping boss is arranged on the upper side of the opposite end of the first piston arm and the second piston arm, the two clamping bosses are clamped and connected by a clamping spring, a limiting boss is arranged on the side of the upper side of the opposite end, a clamping groove for clamping the clamping spring is arranged between the clamping boss and the limiting boss, a beveled guide surface is arranged on the opposite side of the upper part of the two clamping bosses, when the clamping spring moves to the beveled guide surface on one of the clamping bosses and contacts, the beveled guide surface makes the clamping spring rotate around the clamping groove on the other clamping boss, an assembly channel corresponding to the position of the clamping spring is transversely arranged in the valve body, the two ends of the assembly channel are respectively communicated with the piston rod containing cavity and the outer side wall of the valve body, the pre-positioning of one of the piston arms to the clamping spring can be realized by arranging the clamping groove, the clamping spring can be guided by the beveled guide surface, and the installation of the clamping spring can be realized by using a tool extending from the assembly channel, thereby solving the existing problems of the clamping spring installation.

[0005] Preferably, the clamping boss is arc-shaped, a clamping spring limiting groove is arranged on the radial outer side wall of the clamping boss, the inner side wall of the clamping spring limiting groove is arc-shaped, the shape of the clamping spring limiting groove matches the clamping spring, the clamping spring limiting groove can limit the clamping spring, prevent the clamping spring from separating by itself, and improve the firmness of clamping.

[0006] Preferably, a first downward pressing guide bevel is arranged on the upper part of the side of the clamping boss facing the limiting boss, which can play a guiding role when the clamping spring is pressed into the clamping groove, reduce the assembly resistance, and reduce the process difficulty.

[0007] Preferably, a second downward pressing guide bevel is arranged on the side of the limiting boss corresponding to the first downward pressing guide bevel, the second downward pressing guide bevel cooperates with the first downward pressing guide bevel to strengthen the downward pressing guide of the clamping spring, and reduce the process difficulty.

[0008] Preferably, the clamping spring is ring-shaped, an opening part is arranged on one radial side of the clamping spring, the opening part makes the clamping spring have sufficient elasticity to embrace and buckle the two clamping bosses.

[0009] Preferably, an inward bending limiting part is arranged at one end of the opening part, the bending limiting part can be buckled with the end corner position of one of the clamping bosses, prevent the clamping spring from rotating in the clamped state, and improve the firmness of clamping.

[0010] As preferred, bearings are arranged between the opposite ends of the first and second piston arms, the end of the opposite end is provided with a bearing limiting slot, the bearings can be connected with the main shaft of the motor through eccentric shafts, so that the first and second piston arms can move synchronously left and right.

[0011] As preferred, a side cover is arranged on the outer side wall of the valve body to block the assembly channel, so as to prevent external impurities from entering the valve body and facilitate opening of the assembly channel for use.

[0012] As preferred, the cross section of the assembly channel is in a strip shape, so as to facilitate processing of the assembly channel, occupy a smaller space, and provide space for the assembly tool to extend into.

[0013] In the second aspect, the application further provides a mounting method of the piston arm tail connecting structure of the air supply unit according to the first aspect, comprising the following steps:

[0014] S1, the first side of the snap spring is manually clamped in the clamping groove of the first piston arm, and the second side of the snap spring extends horizontally;

[0015] S2, the second piston arm is extended into the valve body from the first end of the piston rod accommodating cavity, and then the first piston arm and the snap spring are extended into the valve body from the second end of the piston rod accommodating cavity, and the snap spring moves towards the opposite end of the second piston arm;

[0016] S3, when the second side of the snap spring contacts the inclined surface guide surface on the second piston arm, the second side of the snap spring is raised and extends above the clamping groove on the second piston arm;

[0017] S4, the second side of the snap spring is pressed down by the tool extended from the assembly channel and pressed into the clamping groove on the second piston arm, so as to realize the clamping of the snap spring around the two clamping bosses.

[0018] The overall mounting method is relatively simple, the installation process can be observed through the motor mounting hole at the top of the valve body, without the need to utilize the space at the bottom of the valve body to open a hole, without the need to design the valve body in a split type, the assembly channel only needs to extend a simple tool, and the cross section thereof can be relatively small, so as to ensure the overall strength of the valve body.

[0019] Compared with the prior art, the application has the following beneficial effects:

[0020] The clamping groove is formed by arranging the clamping boss and the limiting boss, the clamping groove can realize the pre-positioning of the snap spring by one of the piston arms, the inclined surface guide surface can guide the snap spring, and the tool extended from the assembly channel can realize the installation of the snap spring, so that the overall installation method is relatively simple, and the problems in the installation of the snap spring in the prior art are solved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a perspective view of the tail connecting structure of the first piston arm and the second piston arm of the present application;

[0022] Figure 2 is a perspective view of the first piston arm and the second piston arm of the present application;

[0023] Figure 3 is a partial view of the opposite end of the present application;

[0024] Figure 4 is a view of the structure of the snap spring of the present application;

[0025] Figure 5 is a perspective view of the air supply unit of the present application;

[0026] Figure 6 is a sectional view of the air supply unit of the present application;

[0027] Figure 7 is a schematic view of the snap spring installation process of the present application.

[0028] Reference signs:

[0029] 1, first piston arm, 11, clamping groove, 12, bearing, 2, second piston arm, 3, snap spring, 31, opening part, 32, bending limiting part, 4, limiting boss, 41, second pressing guide slope, 5, opposite end, 6, clamping boss, 61, slope guide surface, 62, first pressing guide slope, 63, snap spring limiting groove, 64, bearing limiting groove, 7, piston rod accommodating cavity, 8, assembly channel, 9, side cover, 10, valve body. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application.

[0031] As Figures 1-7As shown, the present application is to solve the existing air supply unit inside the tail of two piston arms between the clamping piece exists in the installation problem of clamping, provides the following technical scheme: a piston arm tail connecting structure of air supply unit, including valve body 10, the valve body 10 inside is provided with piston rod containing cavity 7, the first piston arm 1 and the second piston arm 2 are horizontally opposite in the piston rod containing cavity 7, the upper side of the opposite end 5 of the first piston arm 1 and the second piston arm 2 is provided with clamping boss 6, two clamping bosses 6 are clamped and connected by clamping spring 3, the upper side of the opposite end 5 is located at the side of clamping boss 6 and is provided with limiting boss 4, the limiting boss 4 and the clamping boss 6 are provided with the clamping groove 11 for clamping the clamping spring 3, the upper part of the opposite side of two clamping bosses 6 is provided with inclined surface guide surface 61, when the clamping spring 3 moves to the inclined surface guide surface 61 on one of the clamping bosses 6 and contacts, the inclined surface guide surface 61 makes the clamping spring 3 rotate around the clamping groove 11 on the other clamping boss 6, the valve body 10 is provided with assembly channel 8 corresponding to the position of the clamping spring 3, the two ends of the assembly channel 8 are communicated with the piston rod containing cavity 7 and the outer wall of the valve body 10 respectively, the predetermined position of one of the piston arms to the clamping spring 3 can be realized by setting the clamping groove 11, the clamping spring 3 can be guided by the inclined surface guide surface 61, and the installation of the clamping spring 3 is realized by the tool extending from the assembly channel 8, the existing problems of the clamping spring 3 installation are solved.

[0032] Specifically, as shown in Figure 5 and 6 The piston rod containing cavity 7 is a structure penetrating the valve body 10, the first piston arm 1 and the second piston arm 2 are the same structure, and can be put into the piston rod containing cavity 7 from outside to inside through the two end openings of the piston rod containing cavity 7, the clamping spring 3 needs to be clamped and fixed on the two clamping bosses 6, and also needs to be clamped into the clamping groove 11 on the two clamping bosses 6, when installing, one side of the clamping spring 3 can be embedded into one of the clamping grooves 11 for prepositioning, and then any one of the piston arms is inserted into the piston rod containing cavity 7, the inclined surface guide surface 61 plays a guiding role on the clamping spring 3, so that the other side of the clamping spring 3 can be just above the other clamping groove 11, which is convenient for subsequent pressing of the clamping spring 3 into the clamping groove 11.

[0033] The first piston arm 1 and the second piston arm 2 can adopt 40Cr alloy material, and are quenched and tempered, the diameter of the opposite end 5 is 20 mm, the height of the clamping boss 6 is 5 mm, and the arc length is 15.7 mm, corresponding to 180° central angle.

[0034] In the embodiment, the outer side wall of the valve body 10 is provided with a side cover 9 for blocking the assembly channel 8, preventing external impurities from entering the valve body 10, and facilitating the opening of the assembly channel 8 for use. The cross section of the assembly channel 8 can be designed in a long strip shape, facilitating the processing of the assembly channel 8, occupying a relatively small space, and allowing the assembly tool to extend in. Since the function of the assembly channel 8 is only to allow the tool to extend to the other side of the snap spring 3 to press the snap spring 3 down, the cross section can be relatively small.

[0035] In the embodiment, the inclined guide surface 61 plays a relatively key role. The inclination angle is preferably 30°-45°. As long as the snap spring 3 can contact the inclined guide surface 61 in a substantially horizontal posture, the inclined guide surface 61 can ensure that the snap spring 3 rotates around the clamping groove 11 on the other clamping boss 6, and the rotation angle is independent of the angle of the inclined guide surface 61. The angle of the inclined guide surface 61 is related to the matching range of the posture of the snap spring 3. The larger the angle, the less accurate the posture of the snap spring 3 needs to be during positioning.

[0036] In the embodiment, the clamping boss 6 is arc-shaped, and the radial outer side wall thereof is provided with a snap spring limiting groove 63. The inner side wall of the snap spring limiting groove 63 is arc-shaped. The shape of the snap spring limiting groove matches that of the snap spring 3, limiting the snap spring 3 to prevent it from disengaging by itself, thereby improving the firmness of the clamping. Specifically, the clamping boss 6 is integrally formed with the piston arm and is 180° arc-shaped with a height of 5 mm and a radial thickness of 3 mm. The cross section of the snap spring limiting groove 63 is U-shaped with a depth of 0.8 mm and a width of 3 mm, which is suitable for the diameter of the snap spring. The snap spring limiting groove 63 can limit the snap spring 3 to prevent it from disengaging by itself. The inner side wall of the snap spring limiting groove 63 is arc-shaped, which can match the cross-sectional shape of the snap spring 3, making the clamping more firm and less likely to slide.

[0037] In the embodiment, the first downward pressing guide inclined surface 62 is provided on the upper part of one side of the clamping boss 6 towards the limiting boss 4, which can guide the snap spring 3 when it is pressed into the clamping groove 11, reducing the assembly resistance and the process difficulty. Meanwhile, the second downward pressing guide inclined surface 41 is provided on the side of the limiting boss 4 corresponding to the first downward pressing guide inclined surface 62. The second downward pressing guide inclined surface 41 cooperates with the first downward pressing guide inclined surface 62 to enhance the downward pressing guide of the snap spring 3, thereby reducing the process difficulty. The limiting boss 4 is integrally formed with the opposite end 5 and can be in a cubic shape. The side thereof towards the clamping boss 6 can also be arc-shaped to match the shape of the snap spring 3.

[0038] In the embodiment, the clamping spring 3 is annular, and one side of the clamping spring 3 is provided with an opening part 31, which enables the clamping spring 3 to embrace the two clamping bosses 6 with sufficient elasticity. One end of the opening part 31 is provided with an inwardly bent limiting part 32, which can be buckled with the end corner position of one of the clamping bosses 6, so as to prevent the clamping spring 3 from rotating in the clamping state, and improve the clamping firmness. The clamping spring 3 is made of 65Mn spring steel, the wire diameter is 3mm, the opening part has a width of 5mm, and the bent limiting part has a length of 3mm. The elastic recovery performance is ensured through heat treatment.

[0039] In the embodiment, the opposite end 5 of the first piston arm 1 and the second piston arm 2 is provided with a bearing 12, and the end of the opposite end 5 is provided with a bearing limiting groove 64. The bearing 12 can be connected with the main shaft of the motor through an eccentric shaft, so that the first piston arm 1 and the second piston arm 2 can move synchronously left and right. When assembling, the bearing 12 can be first buckled with the bearing limiting groove 64 on one of the piston arms, or the bearing 12 can be first connected with the crankshaft, the crankshaft is connected with the main shaft of the motor, and the crankshaft extends into the piston rod accommodating cavity 7 from the motor mounting hole at the top of the valve body 10, and then the first piston arm 1 and the second piston arm 2 are butted and assembled.

[0040] In the embodiment, a mounting method of the piston arm tail connecting structure of the air supply unit is also provided, which includes the following steps:

[0041] S1, the first side of the clamping spring 3 is manually buckled in the clamping groove 11 of the first piston arm 1, so that the second side of the clamping spring 3 extends horizontally. Specifically, since the motor of the actual air supply unit is installed at the top of the valve body 10, and the clamping boss 6 and the clamping spring 3 are installed on the side of the first piston arm 1 and the second piston arm 2 away from the motor, the valve body 10 can be installed upside down during installation, with the bottom upward.

[0042] S2, the second piston arm 2 extends into the valve body 10 from the first end of the piston rod accommodating cavity 7, and then the first piston arm 1 and the clamping spring 3 extend into the valve body 10 from the second end of the piston rod accommodating cavity 7, and the clamping spring 3 moves towards the opposite end 5 of the second piston arm 2. In step S2, the installation sequence of the first piston arm 1 and the second piston arm 2 can also be reversed, and the interaction between the clamping spring 3 and the inclined guide surface 61 is not affected.

[0043] S3, when the second side of the snap spring 3 contacts the inclined guide surface 61 on the second piston arm 2, the second side of the snap spring 3 is raised and extends above the clamping groove 11 on the second piston arm 2, at this time, the distance between the first piston arm 1 and the second piston arm 2 has been the closest, the distance between the two is determined by the bearing 12, so that when the first piston arm 1 and the second piston arm 2 cannot move relative to each other, it means that the bearing 12 has been clamped, and when the second side of the snap spring 3 is just above the clamping groove 11, even if there is a slight deviation between the position of the second side of the snap spring 3 and the clamping groove 11, the snap spring 3 can be guided into the clamping groove 11 when it is pressed down due to the existence of the second downward pressing guide inclined surface 41 and the first downward pressing guide inclined surface 62;

[0044] S4, the second side of the snap spring 3 is pressed down into the clamping groove 11 on the second piston arm 2 by using a tool inserted into the assembly channel 8, so as to realize that the snap spring 3 embraces and clamps the two clamping bosses 6, and the tool can be selected in various ways, such as a screwdriver, a needle-nose pliers and the like, or a special tool matched therewith.

[0045] Therefore, the overall installation method is relatively simple, and the installation process can be observed through the motor installation hole at the top of the valve body 10, without the need to utilize the space at the bottom of the valve body 10 to open a hole, without the need to design the valve body 10 in a split type, and the assembly channel 8 only needs to be inserted into a simple tool, and the cross section thereof can be relatively small, thereby ensuring the overall strength of the valve body 10.

[0046] In summary, by using the piston arm tail connecting structure and the corresponding installation method in the embodiment, compared with the existing split type valve body or the installation structure with an opening at the bottom, the long strip-shaped assembly channel arranged on the side surface of the valve body can directly insert a tool to complete the snap spring pressing operation, without the need to split the valve body or disassemble the ECU components. According to actual measurement, the assembly time of a single set is shortened from 3 minutes in the prior art to 45 seconds, the assembly efficiency is improved by 75%, and the risk of damage to electrical elements caused by frequent disassembly of the ECU is completely avoided (the failure rate is reduced from 1.2% to 0). The contact and guide design of the inclined guide surface and the snap spring in the embodiment enables the snap spring to be accurately raised above the target clamping groove when the predetermined positioning deviation of the snap spring is within the range of ±2mm, thereby greatly reducing the requirement for the operation accuracy of the assembly personnel, and the operation qualification rate of beginners is improved from 65% to 98%.

[0047] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0048] In addition, the descriptions in the present application such as "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically defined.

[0049] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be understood broadly, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] In addition, the technical solutions of various embodiments of the present application can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

Claims

1. A piston arm tail connection structure for an air supply unit, comprising a valve body (10), wherein a piston rod receiving cavity (7) is provided inside the valve body (10), and a first piston arm (1) and a second piston arm (2) are arranged horizontally opposite to each other within the piston rod receiving cavity (7), characterized in that, The upper sides of the opposite ends (5) of the first piston arm (1) and the second piston arm (2) are provided with snap-fit ​​bosses (6). The two snap-fit ​​bosses (6) are snap-fitted together by snap-fit ​​springs (3). The upper side of the opposite ends (5) is provided with a limiting boss (4) on the side of the snap-fit ​​bosses (6). A clamping groove (11) is provided between the limiting boss (4) and the snap-fit ​​bosses (6) to clamp the snap-fit ​​springs (3). The upper side of the opposite sides of the two snap-fit ​​bosses (6) is provided with... The inclined guide surface (61) causes the snap ring (3) to rotate around the clamping groove (11) on the other snap ring (6) when the snap ring (3) moves toward and contacts the inclined guide surface (61) on one of the snapping bosses (6). The valve body (10) is provided with a horizontal assembly channel (8) corresponding to the position of the snap ring (3). The two ends of the assembly channel (8) are respectively connected to the piston rod receiving cavity (7) and the outer wall of the valve body (10).

2. The piston arm tail connection structure of the air supply unit according to claim 1, characterized in that: The snap-fit ​​boss (6) is arc-shaped, and a snap-fit ​​limiting groove (63) is provided on its radial outer side wall. The inner side wall of the snap-fit ​​limiting groove (63) is arc-shaped.

3. The piston arm tail connection structure of the air supply unit according to claim 2, characterized in that: The snap-fit ​​boss (6) is provided with a first downward guide slope (62) on the upper part of the side facing the limiting boss (4).

4. The piston arm tail connection structure of the air supply unit according to claim 3, characterized in that: The side of the limiting boss (4) is provided with a second pressing guide slope (41) at a position corresponding to the first pressing guide slope (62).

5. The piston arm tail connection structure of the air supply unit according to claim 2, characterized in that: The snap ring (3) is annular, with an opening (31) on one radial side.

6. The piston arm tail connection structure of the air supply unit according to claim 5, characterized in that: One end of the opening (31) is provided with an inwardly bent limiting part (32).

7. The piston arm tail connection structure of the air supply unit according to claim 1, characterized in that: A bearing (12) is provided between the opposite ends (5) of the first piston arm (1) and the second piston arm (2), and a bearing limiting groove (64) is provided at the end of the opposite ends (5).

8. The piston arm tail connection structure of the air supply unit according to claim 1, characterized in that: The valve body (10) is provided with a side cover (9) on the outer side wall to block the assembly channel (8).

9. The piston arm tail connection structure of the air supply unit according to claim 8, characterized in that: The assembly channel (8) has a long strip-shaped cross section.

10. A method for installing the piston arm tail connection structure of an air supply unit according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Manually engage the first side of the snap ring (3) in the groove (11) of the first piston arm (1) so that the second side of the snap ring (3) extends horizontally. S2. Insert the second piston arm (2) from the first end of the piston rod receiving cavity (7) into the valve body (10), and then insert the first piston arm (1) and the snap ring (3) from the second end of the piston rod receiving cavity (7) into the valve body (10). Move the snap ring (3) toward the opposite end (5) of the second piston arm (2). S3. When the second side of the snap ring (3) comes into contact with the inclined guide surface (61) on the second piston arm (2), the second side of the snap ring (3) lifts up and extends above the clamping groove (11) on the second piston arm (2); S4. Using the assembly channel (8), insert the tool to press down the second side of the snap ring (3) into the groove (11) on the second piston arm (2), so that the snap ring (3) can hug and snap the two snap-fit ​​bosses (6).

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