Axial guiding type starter driving gear elastic buffering device

Abstract

The utility model discloses an axial guiding type starter driving gear elastic buffering device which comprises a driving gear and a spline pipe, and the driving gear and the spline pipe are coaxially assembled. The driving gear is assembled on the spline pipe in a shaft moving fit mode, buffer springs which are evenly distributed in a circumferential array mode are arranged between the driving gear and the spline pipe, and the driving gear and the spline pipe achieve elastic buffering shaft moving fit through the buffer springs and the spline pipe. Buffering is conducted through the buffering springs evenly distributed in the circumferential direction when the driving gear is meshed with the flywheel, it is guaranteed that buffering force is evenly distributed, and local stress concentration is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of starter one-way device technology, and particularly relates to an axially guided starter drive gear elastic buffer device. Background Technology

[0002] When the drive gear of a traditional starter meshes with the flywheel ring gear, the rigid collision can easily cause milling noise and tooth surface wear. Existing buffer structures mostly use a single spring or asymmetrical layout, which has problems such as uneven buffering, circumferential offset, and stroke loss control. Moreover, there is a lack of secondary buffering when meshing occurs, which leads to a shortening of component life due to multiple or offset collisions. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, this utility model provides an axially guided starter drive gear elastic buffer device, which uses circumferentially distributed buffer springs to buffer when the drive gear meshes with the flywheel, ensuring uniform distribution of buffer force and avoiding local stress concentration.

[0004] Technical solution: To achieve the above objectives, this utility model provides an axially guided starter drive gear elastic buffer device, which includes a drive gear and a spline tube, wherein the drive gear and the spline tube are coaxially assembled.

[0005] The drive gear shaft displacement fits the spline tube and is assembled on the spline tube. A buffer spring is evenly distributed in a circumferential array between the drive gear and the spline tube. The drive gear achieves elastic buffering shaft displacement fit with the spline tube through the buffer spring.

[0006] Furthermore, the outer ring of the spline tube is provided with an axial guide groove, and the inner ring of the drive gear is provided with an axial guide block. The axial guide block cooperates with the axial guide groove to allow the drive gear to slide axially relative to the spline tube and to be limited in the circumferential direction.

[0007] Furthermore, a plurality of the aforementioned axial guide grooves are evenly distributed in a circumferential array on the outer ring of the spline tube, and a plurality of the aforementioned axial guide blocks are evenly distributed in a circumferential array on the inner ring of the drive gear, and the axial guide blocks are integrally formed with the drive gear.

[0008] Furthermore, the buffer spring is arranged parallel to the axis of the drive gear or spline tube, and both ends of the buffer spring are fixedly connected to the drive gear and spline tube, respectively.

[0009] Furthermore, the buffer spring is a helical spring located in the axial guide groove. The helical spring is radially limited by the axial guide groove to maintain the elastic extension and contraction direction of the helical spring always on the central axis.

[0010] Furthermore, a front retaining ring is embedded at the front end of the spline tube, and an integrally formed rear retaining ring is provided on the spline tube body. The drive gear is located between the front retaining ring and the rear retaining ring to limit the travel of the drive gear on the spline tube.

[0011] Furthermore, one end of the buffer spring is connected to a straight plate with an axial fastener, and the straight plate is fixed to the axial guide block by the axial fastener.

[0012] The other end of the buffer spring is connected to an L-shaped plate with radial fasteners, and the L-shaped plate is fixed to the rear enclosure by radial fasteners.

[0013] Furthermore, the inner ring of the front end of the drive gear is fitted with an anti-collision pad corresponding to the front retaining ring.

[0014] Beneficial effects: The buffer spring of this utility model absorbs axial impact energy during meshing, reduces direct hard collision between the drive gear and the flywheel ring gear, reduces noise and milling risk, and the elastic buffering characteristics allow the drive gear to be fine-tuned when it is not fully meshed, improving meshing efficiency. In addition, the circumferentially distributed buffer spring ensures the uniform distribution of buffering force and avoids local stress concentration. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is an exploded view of the structure of this utility model;

[0017] Figure 3 This is a half-sectional structural diagram of the present invention. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] like Figure 1 , Figure 2 as well as Figure 3As shown, an axially guided starter drive gear elastic buffer device includes a drive gear 1 and a spline tube 2, which are coaxially assembled. The drive gear 1 is axially offset and fitted onto the spline tube 2. A circumferentially arrayed buffer spring 3 is disposed between the drive gear 1 and the spline tube 2. The drive gear 1 achieves elastic buffering axial offset engagement with the spline tube 2 through the buffer springs 3. The buffer springs 3 of this invention absorb axial impact energy during meshing, reducing direct hard collisions between the drive gear 1 and the flywheel ring gear, lowering noise and milling risk. The elastic buffering characteristics allow the drive gear 1 to be fine-tuned before full engagement, improving meshing efficiency. Furthermore, the circumferentially distributed buffer springs 1 ensure uniform distribution of buffering force, avoiding localized stress concentration.

[0020] The outer ring of the spline tube 2 has an axial guide groove 21, and the inner ring of the drive gear 1 has an axial guide block 11. The axial guide block 11 cooperates with the axial guide groove 21, allowing the drive gear 1 to slide axially relative to the spline tube 2 and to be circumferentially limited. The cooperation between the axial guide groove 21 and the axial guide block 11 ensures that the drive gear 1 moves only in the axial direction, avoiding meshing misalignment caused by circumferential offset. The circumferential limiting function improves the alignment accuracy between the drive gear 1 and the flywheel ring gear and reduces tooth surface wear.

[0021] A plurality of the aforementioned axial guide grooves 21 are evenly distributed in a circumferential array on the outer ring of the spline tube 2, and a plurality of the aforementioned axial guide blocks 11 are evenly distributed in a circumferential array on the inner ring of the drive gear 1. The even distribution design ensures that the drive gear 1 is subjected to uniform force, preventing local overload from causing structural deformation. Furthermore, the axial guide blocks 11 and the drive gear 1 are integrally formed, and the integral forming process enhances the connection strength between the axial guide blocks 11 and the drive gear 1.

[0022] The buffer spring 3 is arranged parallel to the axis of the drive gear 1 or the spline tube 2. The axial force direction of the buffer spring 3 is consistent with the meshing impact direction, maximizing the buffering efficiency. The two ends of the buffer spring 3 are fixedly connected to the drive gear 1 and the spline tube 2 respectively, preventing the buffer spring 3 from shifting or falling off during vibration and improving the structural reliability.

[0023] The buffer spring 3 is a helical spring located within the axial guide groove 21. The axial guide groove 21 radially limits the helical spring to ensure that its elastic extension and contraction direction is always on the central axis. The axial guide groove 21 restricts the radial displacement of the spring, ensuring that the spring compression and extension trajectory is always along the axial direction, avoiding spring failure caused by off-center loading. Moreover, the linear elastic characteristics of the helical spring provide predictable buffering force, facilitating control of the axial movement stroke of the drive gear 1.

[0024] The front end of the spline tube 2 is fitted with a front retaining ring 6, and the body of the spline tube 2 is provided with an integrally formed rear retaining ring 22. The drive gear 1 is located between the front retaining ring 6 and the rear retaining ring 22 to limit the travel of the drive gear 1 on the spline tube 2, thereby preventing the drive gear 1 from overextending or retracting, avoiding plastic deformation of the spring or gear disengagement due to overtravel, ensuring that the drive gear 1 works within the safe travel range, and extending the structural life.

[0025] One end of the buffer spring 3 is connected to a straight plate 31 with an axial fastener 4, and the straight plate 31 is fixed to the axial guide block 11 by the axial fastener 4; the other end of the buffer spring 3 is connected to an L-shaped plate 32 with a radial fastener 5, and the L-shaped plate 32 is fixed to the rear enclosure 22 by the radial fastener 5. The combined design of the straight plate 31 and the L-shaped plate 32 achieves multi-directional fixation, enhances the stability of the spring connection, and the axial and radial fasteners work together to prevent the connector from loosening under high-frequency vibration and improve fatigue resistance.

[0026] The inner ring of the front end of the drive gear 1 is fitted with an anti-collision pad 7 corresponding to the front retaining ring 6. The anti-collision pad 7 provides secondary buffering when the front retaining ring 6 contacts the drive gear 1, further absorbing the remaining impact energy and reducing the noise generated by direct collision of metal parts, while protecting the surface of the front retaining ring 6 from wear.

[0027] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An axially guided starter drive gear elastic buffer device, comprising a drive gear (1) and a spline tube (2), wherein the drive gear (1) and the spline tube (2) are coaxially assembled; Its features are: The drive gear (1) is mounted on the spline tube (2) with a shaft shifting fit. A buffer spring (3) is evenly distributed in a circumferential array between the drive gear (1) and the spline tube (2). The drive gear (1) achieves a shaft shifting fit with the spline tube (2) through the buffer spring (3) to achieve elastic buffering.

2. The axially guided starter drive gear elastic buffer device according to claim 1, characterized in that: The outer ring of the spline tube (2) is provided with an axial guide groove (21), and the inner ring of the drive gear (1) is provided with an axial guide block (11). The axial guide block (11) cooperates with the axial guide groove (21) to make the drive gear (1) slide axially relative to the spline tube (2) and be limited in the circumferential direction.

3. The axially guided starter drive gear elastic buffer device according to claim 2, characterized in that: A plurality of the aforementioned axial guide grooves (21) are evenly distributed in a circumferential array on the outer ring of the spline tube (2), and a plurality of the aforementioned axial guide blocks (11) are evenly distributed in a circumferential array on the inner ring of the drive gear (1), and the axial guide blocks (11) and the drive gear (1) are integrally formed.

4. The axially guided starter drive gear elastic buffer device according to claim 3, characterized in that: The buffer spring (3) is arranged parallel to the axis of the drive gear (1) or the spline tube (2), and the two ends of the buffer spring (3) are fixedly connected to the drive gear (1) and the spline tube (2) respectively.

5. The axially guided starter drive gear elastic buffer device according to claim 4, characterized in that: The buffer spring (3) is a helical spring located in the axial guide groove (21). The helical spring is radially limited by the axial guide groove (21) to keep the elastic extension and contraction direction of the helical spring always on the central axis.

6. The axially guided starter drive gear elastic buffer device according to claim 5, characterized in that: The front end of the spline tube (2) is fitted with a front retaining ring (6), and an integrally formed rear retaining ring (22) is provided on the body of the spline tube (2). The drive gear (1) is located between the front retaining ring (6) and the rear retaining ring (22) to limit the travel of the drive gear (1) on the spline tube (2).

7. The axially guided starter drive gear elastic buffer device according to claim 6, characterized in that: One end of the buffer spring (3) is connected to a straight plate (31) with an axial fastener (4), and the straight plate (31) is fixed to the axial guide block (11) by the axial fastener (4). The other end of the buffer spring (3) is connected to an L-shaped plate (32) with radial fasteners (5), and the L-shaped plate (32) is fixed to the rear enclosure (22) by the radial fasteners (5).

8. The axially guided starter drive gear elastic buffer device according to claim 7, characterized in that: The front inner ring of the drive gear (1) is fitted with an anti-collision pad (7) corresponding to the front retaining ring (6).

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