Piston arm clamp spring clamping structure and air supply unit

Abstract

The utility model discloses a piston arm snap spring clamping structure and an air supply unit, which comprise a first piston arm and a second piston arm which are horizontally and oppositely arranged, a bearing is arranged between the opposite ends of the first piston arm and the second piston arm, and clamping bosses are arranged on one sides of the opposite ends of the first piston arm and the second piston arm. The clamping bosses are clamped through a clamping spring, the clamping spring is provided with a radial opening end, and when the clamping spring horizontally moves in the posture that the radial opening end faces the clamping bosses and makes contact with the two clamping bosses, the radial opening end is opened till the clamping spring surrounds and buckles the two clamping bosses. By arranging the clamping boss and the clamping spring, clamping can be completed by horizontally moving the clamping spring from the side portions of the first piston arm and the second piston arm, installation is easy and reliable, the valve body does not need to be arranged in a split mode, and installation does not need to be conducted through an opening in the bottom of the valve body. According to the air supply unit, the installation problem existing in a clamping structure between two piston arms in an existing air supply unit can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile air supply unit, concretely is a piston arm snap spring joint structure and air supply unit. BACKGROUND

[0002] With the gradually increasing requirement of comfort of automobile, air suspension obtains the rapid development, and the design of electronic product tends to modularization and miniaturization, and the closed air supply unit ASU is recognized by many customers due to higher inflation efficiency and less external gas exchange. In the closed air supply unit, two piston arms are often driven to reciprocate by a motor, and bearings need to be installed between the two piston arms. In order to clamp the bearings, a joint part is used to joint the two piston arms. In order to joint the piston arms, a valve body is often made into a split structure, or an opening is arranged at the bottom of the valve body to install the joint part. However, the bottom of the valve body needs to install an ECU part. If the ECU is frequently disassembled, the installation accuracy of the electrical components inside the ECU will be affected. Therefore, a new piston arm joint structure is needed to solve the above problems. SUMMARY

[0003] The utility model provides a kind of piston arm snap spring joint structure and air supply unit, can solve the installation problem of the joint structure between the two piston arms in the internal air supply unit of existing air supply unit.

[0004] To achieve the above object, in the first aspect, the utility model provides the following technical scheme: a kind of piston arm snap spring joint structure, including first piston arm and second piston arm being horizontally opposite, bearing is arranged between the opposite end of first piston arm and second piston arm, the opposite end side of first piston arm and second piston arm is provided with joint boss, the joint boss is jointed by snap spring, the snap spring has a radial opening end, when snap spring is moved horizontally with radial opening end towards the attitude of joint boss and is contacted with two joint bosses, radial opening end opens until snap spring is buckled with two joint bosses, by setting joint boss and snap spring, it can be achieved that snap spring is translated from the side of first piston arm and second piston arm, and jointing can be completed, installation is simple and reliable, without split setting to valve body, also without using the opening at the bottom of valve body to install.

[0005] As preferred, the joint boss is arc-shaped, and a snap spring limiting groove is arranged on the radial outer side wall of the joint boss, so that the snap spring limiting groove can limit the snap spring and prevent the snap spring from being separated from the joint boss.

[0006] As preferred, the inner side wall of the snap spring limiting groove is arc-shaped, so that the inner side wall of the snap spring limiting groove can match the cross-sectional shape of the snap spring, and the jointing is more firm and less likely to slide.

[0007] As preferred, the two ends of the radial opening end of the clamping spring are provided with outward bending portions, which can effectively support the radial opening end when the outward bending portions contact the clamping boss, and facilitate the installation of the clamping spring.

[0008] As preferred, the inner side of the outward bending portion is provided with a circular arc guide portion, which has a guiding effect and reduces the resistance of the clamping spring after contacting the clamping boss.

[0009] In the second aspect, the utility model also relates to an air supply unit, including the piston arm clamping spring clamping structure of first aspect, it also includes valve body and motor arranged on the valve body, the inside of valve body is provided with piston rod containing cavity, first piston arm and second piston arm set up in piston rod containing cavity, the main shaft of motor is connected with bearing through crankshaft, the lateral direction of valve body is provided with the assembly channel corresponding with bearing position, the both ends of assembly channel are connected with piston rod containing cavity and the outside wall of valve body respectively, the clamping spring moves horizontally and clamps the clamping boss along the assembly channel, through setting up assembly channel, the clamping spring can be installed from the side of first piston arm and second piston arm, and the clamping component does not need to be installed by using the position of ECU installed at the bottom of valve body, the assembly channel cooperates with the clamping spring, and the clamping between first piston arm and second piston arm is more simple.

[0010] As preferred, the valve body is provided with a side cover for blocking the assembly channel, which can prevent foreign matters from entering the piston rod containing cavity when the assembly channel is not used, and can be removed when the assembly channel is used.

[0011] As preferred, the cross section of the assembly channel is in a strip shape, which matches the flat clamping spring, and facilitates the use of simple tools to send the clamping spring to the position between the first piston arm and the second piston arm.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] By setting the clamping boss and the clamping spring, the clamping can be completed by translating the clamping spring from the side of the first piston arm and the second piston arm, the structure is simple, the installation is simple and reliable, the valve body does not need to be provided in a split manner, and the installation does not need to use the opening at the bottom of the valve body, thereby solving the problem of installation of the clamping component in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a perspective view of the utility model;

[0015] Figure 2 It is a perspective view of the first piston arm and the second piston arm separated from each other;

[0016] Figure 3 Figure 1 is a front view of the first piston arm and the second piston arm of the utility model;

[0017] Figure 4 Figure 3 is a structure diagram of the clasp spring of the utility model;

[0018] Figure 5 Figure 4 is a sectional view of the air supply unit of the utility model;

[0019] Figure 6 Figure 5 is a top sectional view of the air supply unit of the utility model.

[0020] Reference signs:

[0021] 1, first piston arm, 11, piston rod accommodating cavity, 12, side cover, 2, second piston arm, 3, clasp spring, 32, radial open end, 33, outwardly bent portion, 34, circular arc guide portion, 4, clamping boss, 41, clasp spring limiting groove, 5, bearing, 6, assembly channel, 7, valve body, 8, opposite end, 9, crankshaft, 10, motor. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model.

[0023] As shown in Figures 1-6 The utility model discloses a piston arm clasp spring clamping structure, including the first piston arm 1 and the second piston arm 2 that are horizontally opposite, the opposite end 8 between the first piston arm 1 and the second piston arm 2 is provided with the bearing 5, the opposite end 8 of the first piston arm 1 and the second piston arm 2 is provided with the clamping boss 4 on one side, the clamping boss 4 is clamped through the clasp spring 3, the clasp spring 3 has a radial open end 32, when the clasp spring 3 is moved horizontally with the posture of radial open end 32 towards the clamping boss 4 and is contacted with two clamping bosses 4, the radial open end 32 opens until the clasp spring 3 embraces and buckles two clamping bosses 4, through setting up clamping boss 4 and clasp spring 3, it can be realized that the clasp spring 3 is translated from the side of the first piston arm 1 and the second piston arm 2, and the clamping can be completed, and the installation is simple and reliable, does not need to set up the valve body in parts, also does not need to utilize the valve body bottom opening to install.

[0024] Specifically, the first piston arm 1 and the second piston arm 2 can adopt 45 steel, the opposite end 8 end face of the two is provided with bearing recess, the bearing 5 is embedded into the bearing recess, the bearing 5 can adopt the deep groove ball bearing of model 6202, and is assembled between the opposite ends of the two piston arms by interference fit.

[0025] In the embodiment, the clamping boss 4 is arc-shaped, and a clamping spring limiting groove 41 is arranged on the radially outer side wall of the clamping boss 4. The clamping boss 4 is integrally formed with the piston arm, is 180° arc-shaped, has a height of 5 mm, and has a radial thickness of 3 mm. The clamping spring limiting groove 41 is U-shaped in cross section, has a depth of 0.8 mm, and has a width of 1.6 mm. The clamping spring limiting groove 41 is adapted to the diameter of the clamping spring 3, can limit the clamping spring 3, and prevents the clamping spring 3 from being separated from the clamping boss 4. The inner side wall of the clamping spring limiting groove 41 is arc-shaped, can be matched with the cross-sectional shape of the clamping spring 3, and is more firm after clamping, and is not easy to slide.

[0026] In the embodiment, as a specific embodiment of the clamping spring 3, the radially open ends 32 of the clamping spring 3 are provided with outward bending portions 33 at both ends. When the outward bending portions 33 are in contact with the clamping boss 4, the radially open ends 32 can be effectively expanded, and the clamping spring 3 is beneficial to installation. Meanwhile, the inner side of the outward bending portion 33 is provided with a circular arc guide portion 34, which has a guiding effect and reduces the resistance of the clamping spring 3 after being in contact with the clamping boss 4. Specifically, the clamping spring 3 can be made of 65Mn spring steel, and the outward bending portion 33 extends 5 mm from the open end. The bending angle is 30° relative to the axis of the clamping spring body.

[0027] In the embodiment, the air supply unit also comprises the piston arm clamping spring clamping structure, and further comprises a valve body 7 and a motor 10 arranged on the valve body 7. The valve body 7 is internally provided with a piston rod accommodating cavity 11. The first piston arm 1 and the second piston arm 2 are arranged in the piston rod accommodating cavity 11. The main shaft of the motor 10 is connected with the bearing 5 through a crankshaft 9. The valve body 7 is laterally provided with an assembly channel 6 corresponding to the position of the bearing 5. The two ends of the assembly channel 6 are respectively connected with the piston rod accommodating cavity 11 and the outer side wall of the valve body 7. The clamping spring 3 moves horizontally along the assembly channel 6 and is clamped with the clamping boss 4. The assembly channel 6 can facilitate the installation of the clamping spring 3 from the side of the first piston arm 1 and the second piston arm 2, and the clamping component does not need to be installed by using the position of the ECU installed at the bottom of the valve body 7. The assembly channel 6 cooperates with the clamping spring 3, so that the clamping between the first piston arm 1 and the second piston arm 2 is more simple.

[0028] The valve body 7 is provided with a side cover 12 for plugging the assembly channel 6. When the assembly channel 6 is not used, the side cover 12 can prevent foreign matters from entering the piston rod accommodating cavity 11. When the assembly channel 6 needs to be used, the side cover 12 can be removed. The cross section of the assembly channel 6 is strip-shaped, which is matched with the flat clamping spring 3, and is beneficial to the use of simple tools to send the clamping spring 3 to the position between the first piston arm 1 and the second piston arm 2.

[0029] The installation can adopt the following steps:

[0030] Pre-installed piston arm and bearing: press the bearing 5 into the groove of the opposite end 8 of the first piston arm 1 (interference fit), and then assemble the opposite end 8 of the second piston arm 2 with the other side of the bearing 5, so that the clamping bosses 4 of the two piston arms are aligned.

[0031] Preparation of valve body and assembly channel: the valve body 7 is made of aluminum alloy (ADC12) by die casting, and the assembly channel 6 transversely penetrates the side wall of the valve body, and the cross section is long strip-shaped, and the axis is the same as the axis of the bearing 5 (deviation ≤0.1mm), which ensures that the clamping spring 3 is aligned with the clamping boss 4 when it is translated along the channel;

[0032] Install the clamping spring: remove the side cover 12 on the valve body 7, specifically the buckle connection, which can be pulled out in the axial direction; hold the clamping spring 3 by hand or use a tool to clamp the clamping spring 3, so that the radial opening end 32 faces the clamping boss 4, and then push the clamping spring horizontally into the assembly channel 6; when the circular arc guide part 34 contacts the clamping boss 4, continue to apply force, and the outward bending part 33 is forced to make the radial opening end 32 open to the maximum deformation, until the clamping spring 3 completely enters the clamping spring limiting groove 41; release the external force, and the clamping spring is elastically reset, and the radial opening end 32 is elastically recovered to surround the two clamping bosses 4.

[0033] Complete assembly: buckle the side cover 12 back to the assembly channel 6, drive the crankshaft 9 by the motor 10 (model 555 DC motor, speed 3000rpm), drive the piston arm reciprocating motion, test the clamping stability, and run continuously for 100 hours without loosening.

[0034] Therefore, after adopting the piston arm clamping spring clamping structure in the embodiment, the following hotspots are achieved compared with the prior art: the valve body remains the overall structure without being divided into two parts, the sealing performance is improved by more than 30%; the ECU does not need to be disassembled during the installation process, the electrical connection reliability is improved, and the failure rate is reduced to less than 1 / 5 of the existing structure; the clamping spring is clamped by the elastic deformation of the radial opening end, the axial pre-tightening force of the two piston arms is uniform after clamping, the uneven force on the bearing is avoided, and the service life of the bearing is prolonged to more than 1.5 times of the existing structure.

[0035] 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 the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description and cannot be understood as indicating or implying the relative importance of the technical features or implying the number of the technical features indicated. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0037] 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, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of 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.

[0038] In addition, the technical solutions of each embodiment 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, also not within the protection scope required by the present application.

Claims

1. A piston arm clamp spring clamping structure comprising a first piston arm (1) and a second piston arm (2) arranged horizontally opposite to each other, a bearing (5) being arranged between opposite ends (8) of said first piston arm (1) and said second piston arm (2), characterized in that, A clamping boss (4) is provided on one side of the opposite end (8) of the first piston arm (1) and the second piston arm (2). The clamping bosses (4) are clamped together by a clamping spring (3). The clamping spring (3) has a radial opening end (32). When the clamping spring (3) moves horizontally with the radial opening end (32) toward the clamping boss (4) and contacts the two clamping bosses (4), the radial opening end (32) opens until the clamping spring (3) surrounds the two clamping bosses (4) to form a buckle.

2. The piston arm clip spring clip structure of claim 1, wherein: The clamping boss (4) is arc-shaped, and a clamping spring limiting groove (41) is provided on its radial outer side wall.

3. The piston arm clip spring clip structure of claim 2, wherein: The inner side wall of the retaining ring limiting groove (41) is in an arc shape.

4. The piston arm clip spring clip structure of claim 1, wherein: Outwardly bent portions (33) are provided at both ends of the radially open end (32) of the clamping spring (3).

5. The piston arm clip spring clip structure of claim 4, wherein: An arc guide portion (34) is provided on the inner side of the outward bending portion (33).

6. An air supply unit characterized by comprising: The invention comprises a piston arm retaining spring clamping structure as described in any one of claims 1 to 5, and further comprises a valve body (7) and a motor (10) arranged on the valve body (7), wherein a piston rod accommodating chamber (11) is provided inside the valve body (7), the first piston arm (1) and the second piston arm (2) are provided in the piston rod accommodating chamber (11), the main shaft of the motor (10) is connected to the bearing (5) through the crankshaft (9), an assembly channel (6) corresponding to the position of the bearing (5) is transversely provided in the valve body (7), the two ends of the assembly channel (6) are respectively connected to the piston rod accommodating chamber (11) and the outer wall of the valve body (7), and the retaining spring (3) moves horizontally along the assembly channel (6) to be clamped with the clamping boss (4).

7. The air supply unit according to claim 6, characterized in that: The valve body (7) is provided with a side cover (12) for blocking the assembly channel (6).

8. The air supply unit according to claim 6, characterized in that: The cross section of the assembly channel (6) is in the shape of an elongated strip.

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