Front end bearing connection structure

Abstract

The utility model relates to a front end bearing connecting structure, it includes motor and valve body connected together, the motor includes spindle and the carbon brush seat, front end bearing and eccentric wheel connected on the spindle in proper order, the outside diameter of front end bearing is greater than the rotating outside diameter of eccentric wheel, be equipped with the cavity and the limiting slot that intercommunication on the valve body, the eccentric wheel places in the cavity, the shape of limiting slot is compatible with the outer ring of front end bearing, one end of front end bearing inserts limiting slot and abuts the groove bottom of limiting slot, the other end of front end bearing abuts carbon brush seat. The utility model can guarantee that motor rotor is effectively fixed and supported, can guarantee front end bearing's concentricity, flatness, stability simultaneously, reduce motor's noise vibration, and easy to assemble.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a front bearing connection structure. Background Technology

[0002] like Figure 1-3 As shown, the air compressor supply unit for vehicle air suspension typically includes a pressure control valve and a motor. To simplify the structure, one end of the motor shaft is usually connected to the motor housing via a rear bearing, while the other end is connected to the valve body 2 of the pressure control valve via a front bearing 1. Because the outer diameter of the front bearing 1 is generally smaller than the outer diameter of the counterweight (eccentric wheel), a bearing sleeve 3 is needed to enlarge the outer diameter of the front bearing 1, thereby fixing and supporting the shaft. The front bearing 1 and bearing sleeve 3 are usually press-fitted together, but this can easily lead to significant rotational noise due to poor installation flatness and concentricity. Furthermore, the unstable gap created by press-fitting can affect the service life of the front bearing 1 and also generate noise and vibration. In addition, the cost of press-fitting the front bearing 1 and bearing sleeve 3 is relatively high. Utility Model Content

[0003] In view of the problems existing in the prior art, the purpose of this utility model is to provide a front bearing connection structure that can effectively fix and support the motor rotor, while also ensuring the concentricity, flatness and stability of the front bearing, reducing the noise and vibration of the motor, and is easy to assemble.

[0004] To achieve the above objectives, this utility model discloses a front bearing connection structure, which includes a motor and a valve body connected together. The motor includes a main shaft and a carbon brush holder, a front bearing, and an eccentric wheel connected sequentially on the main shaft. The outer diameter of the front bearing is larger than the rotational outer diameter of the eccentric wheel. The valve body is provided with an interconnected cavity and a limiting groove, and the eccentric wheel is placed in the cavity. The shape of the limiting groove is adapted to the outer ring of the front bearing. One end of the front bearing is inserted into the limiting groove and abuts against the bottom of the limiting groove, and the other end of the front bearing abuts against the carbon brush holder.

[0005] With the above setup, by inserting and abutting the front bearing located at the motor output end into the limiting groove on the valve body, the motor's main shaft can be reliably fixed and supported. This allows the outer diameter of the front bearing to be larger than the outer diameter of the eccentric wheel's rotation, eliminating the need for press-fitting the front bearing sleeve. This simplifies the structure and assembly of the front bearing, reducing component and assembly costs. Furthermore, eliminating the need for a press-fitting sleeve and allowing the front bearing to directly engage with the limiting groove improves its concentricity and flatness, resulting in a more stable gap between the bearing and the groove. This provides advantages in ensuring installation accuracy and stability, while also reducing motor noise and vibration. Additionally, the direct engagement of the front bearing with the limiting groove increases the contact area and depth between the bearing and the valve body, enhancing the bearing's fixing accuracy and stability.

[0006] The difference between the outer diameter of the front bearing and the outer diameter of the eccentric wheel is not less than 1 mm.

[0007] The carbon brush holder is provided with at least three positioning blocks, which abut against the outer ring of the front bearing, or there is a gap between the positioning blocks and the outer ring of the front bearing; the valve body is provided with relief grooves corresponding to the positioning blocks, and the positioning blocks are inserted into the relief grooves. Compared with the existing method of using two semi-circular convex strips to position the front bearing, setting at least three positioning blocks to position the front bearing can also ensure that the front bearing is reliably positioned and held. Moreover, the contact area between the positioning blocks and the front bearing is smaller, which can reduce the problem of uneven contact surface gap caused by the machining precision of the carbon brush holder, and help reduce noise.

[0008] The positioning block has an arc surface on the side near the front bearing that matches the outer ring of the front bearing. This design ensures reliable positioning and holds the front bearing in place.

[0009] The positioning blocks are spaced apart on the outer periphery of the front bearing. This arrangement ensures reliable positioning and holds the front bearing in place.

[0010] The motor also includes a housing, and the shape of the brush holder is adapted to the cross-sectional shape of the inner cavity of the housing. This arrangement ensures reliable positioning and retention of the front bearing.

[0011] By adopting the above solution, the motor's main shaft can be reliably fixed and supported by inserting and abutting the front bearing located at the motor output end into the limiting groove on the valve body. This allows the outer diameter of the front bearing to be larger than the outer diameter of the eccentric wheel, eliminating the need for press-fitting the front bearing sleeve. This simplifies the structure and assembly of the front bearing, reducing component and assembly costs. Furthermore, eliminating the need for a press-fitting sleeve and allowing the front bearing to directly engage with the limiting groove improves its concentricity and flatness, resulting in a more stable gap between the bearing and the groove. This provides advantages in ensuring installation accuracy and stability, while also reducing motor noise and vibration. Additionally, the direct engagement of the front bearing with the limiting groove increases the contact area and depth between the bearing and the valve body, improving the bearing's fixing accuracy and stability. Attached Figure Description

[0012] Figure 1 A schematic diagram (sectional view) of the existing front bearing connection.

[0013] Figure 2 This is a schematic diagram of the motor component in the prior art;

[0014] Figure 3 This is a schematic diagram of the valve body in the prior art;

[0015] Figure 4 This is a schematic diagram of the motor part of this utility model;

[0016] Figure 5 This is an exploded view of the present invention;

[0017] Figure 6 This is a cross-sectional view of the present invention;

[0018] Figure 7 This is a schematic diagram of the valve body;

[0019] Figure 8 This is a schematic diagram of a carbon brush holder.

[0020] Label Explanation:

[0021] 11. Housing; 12. Main shaft; 13. Carbon brush holder; 14. Front bearing; 15. Eccentric wheel; 16. Positioning block; 17. Arc surface;

[0022] Valve body 20; cavity 21; limiting groove 22; clearance groove 23. Detailed Implementation

[0023] The present invention will now be described with reference to the accompanying drawings.

[0024] like Figure 4-8As shown, this utility model discloses a front bearing 14 connection structure, which includes a motor and a valve body 20 connected together. The motor includes a housing 11, a main shaft 12, and a carbon brush holder 13, a front bearing 14, and an eccentric wheel 15 connected sequentially to one output end of the main shaft 12. The end of the main shaft 12 without the eccentric wheel 15 is rotatably connected to the housing 11 through a rear bearing (not shown in the figure). The rotor (not shown in the figure) is located between the carbon brush holder 13 and the rear bearing, and the rotor is electrically connected to the carbon brush holder 13.

[0025] In this case, the outer diameter of the front bearing 14 is larger than the outer diameter of the eccentric wheel 15, and the difference between the outer diameter of the front bearing 14 and the outer diameter of the eccentric wheel 15 is required to be no less than 1mm. In this way, after the eccentric wheel 15 and the front bearing 14 are assembled on the main shaft 12, the eccentric wheel 15 can still be easily inserted into the valve body 20, and the connection between the motor and the valve body 20 is also easy and convenient.

[0026] The valve body 20 has an interconnected cavity 21 and a limiting groove 22, with the limiting groove 22 closer to the motor than the cavity 21. When the motor is connected to the valve body 20, the eccentric wheel 15 passes through the limiting groove 22 and is inserted into the cavity 21. A stepped surface is formed between the cavity 21 and the limiting groove 22, which is also the bottom of the limiting groove 22. The shape of the limiting groove 22 is adapted to the outer ring of the front bearing 14. One end of the front bearing 14 is inserted into the limiting groove 22 and abuts against the bottom of the limiting groove 22, while the other end of the front bearing 14 abuts against the carbon brush holder 13.

[0027] At least three positioning blocks 16 are spaced apart on the carbon brush holder 13, and these positioning blocks 16 are on the same arc of a circle. In this case, four positioning blocks 16 are provided, and the circle formed by the four positioning blocks 16 is coaxial with the main shaft 12. The positioning blocks 16 are provided with arc surfaces 17 that are adapted to the outer ring of the front bearing 14. The arc surfaces 17 abut against the outer ring of the front bearing 14, or there is a small gap between the arc surfaces 17 and the outer ring of the front bearing 14, so as to fix and hold the front bearing 14. The valve body 20 is provided with relief grooves 23 that correspond one-to-one with the positioning blocks 16, and the positioning blocks 16 are inserted into the relief grooves 23. In addition, in order to further ensure the positioning function of the carbon brush holder 13 for the front bearing 14, the shape of the carbon brush holder 13 is also required to be adapted to the cross-sectional shape of the inner cavity of the outer shell 11.

[0028] The key to this invention lies in the fact that by inserting and abutting the front bearing 14 located at the motor output end into the limiting groove 22 on the valve body 20, the main shaft 12 of the motor can be reliably fixed and supported. This allows the outer diameter of the front bearing 14 to be larger than the rotational outer diameter of the eccentric wheel 15, eliminating the need for press-fitting the front bearing 14 set. This simplifies the structure and assembly of the front bearing 14, reducing component and assembly costs. Because the front bearing 14 set is not press-fitted, it directly engages with the limiting groove 22, improving its concentricity and flatness. The gap between the front bearing 14 and the limiting groove 22 is also more stable, offering advantages in ensuring installation accuracy and stability, while also reducing motor noise and vibration. Furthermore, the direct engagement of the front bearing 14 with the limiting groove 22 increases the contact area and depth between the front bearing 14 and the valve body 20, improving the fixing accuracy and stability of the front bearing 14. In addition, compared with the existing method of using two semi-circular convex strips to position the front bearing 14, setting at least three positioning blocks 16 to position the front bearing 14 can also ensure that the front bearing 14 is reliably positioned and held. Moreover, the contact area between the positioning block 16 and the front bearing 14 is smaller, which can reduce the problem of uneven contact surface gap caused by the machining accuracy of the carbon brush holder 13, and help reduce noise.

[0029] The above description is merely an embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A front-end bearing connection structure, characterized in that: The device includes a motor and a valve body connected together. The motor includes a main shaft and a carbon brush holder, a front bearing, and an eccentric wheel connected sequentially to the main shaft. The outer diameter of the front bearing is larger than the outer diameter of the eccentric wheel. The valve body has an interconnected cavity and a limiting groove, and the eccentric wheel is placed in the cavity. The shape of the limiting groove is adapted to the outer ring of the front bearing. One end of the front bearing is inserted into the limiting groove and abuts against the bottom of the limiting groove, and the other end of the front bearing abuts against the carbon brush holder.

2. The front bearing connection structure according to claim 1, characterized in that: The difference between the outer diameter of the front bearing and the outer diameter of the eccentric wheel is not less than 1 mm.

3. The front bearing connection structure according to claim 1, characterized in that: The carbon brush holder is provided with at least three positioning blocks, the positioning blocks abut against the outer ring of the front bearing, or there is a gap between the positioning blocks and the outer ring of the front bearing; the valve body is provided with relief grooves corresponding to the positioning blocks, and the positioning blocks are inserted into the relief grooves.

4. The front bearing connection structure according to claim 3, characterized in that: The positioning block has an arc surface on the side near the front bearing that matches the outer ring of the front bearing.

5. The front bearing connection structure according to claim 3, characterized in that: The positioning blocks are spaced apart on the outer periphery of the front bearing.

6. The front bearing connection structure according to claim 1, characterized in that: The motor also includes a housing, and the shape of the carbon brush holder is adapted to the cross-sectional shape of the inner cavity of the housing.

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