Torsion-resistant swing arm of electric transmission unit

Abstract

The utility model discloses an anti-torsion swing arm of an electric transmission unit. The anti-torsion swing arm comprises a connecting support and a lining. The bushing is pressed on the connecting bracket in an interference manner; the connecting support is used for being connected with a transmission unit, and the lining is used for being connected with a vehicle body. Wherein the bushing is formed by adopting a reducing process and comprises an outer framework, an inner framework and a rubber main spring; the inner framework is installed in the outer framework, and the outer framework and the inner framework are vulcanized into an integrated structure through the rubber main spring. The auxiliary supporting and damping device can provide auxiliary supporting and damping effects for the transmission unit, the movement range of a transmission unit system can be effectively controlled within a target range, abrasion of an output center gear on the electric transmission side is reduced, and product reliability is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric transmission vehicles, and in particular relates to an anti-torsion swing arm of an electric transmission unit. Background Art

[0002] The vehicle electric transmission unit is a complex system, which includes drive motor assembly, thermal management system, controller, acquisition box, oil pump, water pump and other components. With the integrated design of the transmission unit, thermal management, controller and other systems are integrated and mounted on the transmission unit, which makes the torque axis of the transmission unit deviate from the output shaft. The traditional transmission unit is fixed to the vehicle body through the annular suspension on both sides. The transmission unit suspension is mainly affected by the reaction torque of the output torque of the transmission unit and the acceleration, deceleration, steering conditions, and the inertia force of the transmission unit. The peak torque of the electric transmission unit is large. Under rapid acceleration and deceleration conditions, the inertia force is large, and the torque axis deviates from the output shaft. The two-point support suspension cannot control the dynamic displacement of the electric transmission unit, resulting in wear of the output center gear on the electric transmission side. Therefore, it is urgent to add a new electric transmission unit torsion-resistant swing arm to assist in supporting the transmission unit, which can effectively control the motion displacement of the output center of the transmission unit under extreme conditions and reduce the risk of wear of the output center gear on the electric transmission unit side. Utility Model Content

[0003] In view of this, the utility model provides an anti-torsion swing arm of an electric transmission unit, which can provide auxiliary support and vibration reduction for the transmission unit, and can effectively control the motion range of the transmission unit system within a target range, reduce the wear of the output center gear on the electric transmission side, and improve product reliability.

[0004] The utility model is realized by the following technical solutions:

[0005] An anti-torsion swing arm of an electric transmission unit comprises: a connecting bracket and a bushing; the bushing is press-fitted on the connecting bracket by interference fit; the connecting bracket is used to connect to the transmission unit, and the bushing is used to connect to a vehicle body; wherein the bushing is formed by a reduction process, and comprises: an outer frame, an inner frame and a rubber main spring; the inner frame is installed in the outer frame, and the outer frame and the inner frame are vulcanized into an integrated structure through the rubber main spring.

[0006] Furthermore, the outer frame is a cylindrical thin-walled stamping structure, and one end of the outer frame is provided with a circular flange.

[0007] Furthermore, the inner frame is a cylindrical structure, the cross-section of which is a rounded rhombus, that is, each corner of the rhombus is chamfered; the center of the inner frame is processed with a through hole along its length, and the through hole is used to connect to the vehicle body; when the inner frame is installed in the outer frame, the center line of the inner frame is coaxial with the axis of the outer frame.

[0008] Furthermore, the bushing also includes two inserts, which are arc-shaped thin sheets installed between the outer surface of the inner frame and the inner surface of the outer frame. The insert is coaxial with the outer frame, and the two inserts are symmetrically arranged on both sides of the inner frame.

[0009] Furthermore, the rubber main spring is filled between the inner surface of the outer frame and the outer surface of the inner frame, and the insert between the outer frame and the inner frame is fixed; and both ends of the rubber main spring are concave, reserving extrusion space for deformation of the rubber main spring; and the end of the rubber main spring on the same side as the circular flange covers the circular flange of the exoskeleton and protrudes by a certain thickness, and the protruding part serves as a lateral limiting structure of the anti-torsion swing arm.

[0010] Furthermore, the rubber main spring is made of natural rubber with a hardness of 65 degrees Shore hardness.

[0011] Furthermore, the connecting bracket includes: a connecting plate and a transition rib; one end of the transition rib is fixed on the connecting plate, and the length direction of the transition rib is perpendicular to the plate surface of the connecting plate; a connecting hole is processed on the other end of the transition rib, and the axis of the connecting hole is perpendicular to the plate surface of the transition rib; the connecting hole is used for press-fitting a bushing.

[0012] Furthermore, the connection plate is provided with two rows of mounting holes, which are respectively located on both sides of the transition rib and are used to connect with the transmission unit; and the axis of each mounting hole is perpendicular to the plate surface of the connection plate.

[0013] Furthermore, weight-reducing holes are provided on both sides of the transition rib.

[0014] Furthermore, an introduction slope is provided on the inner side of the end of the connecting hole, and the angle between the introduction slope and the axis of the connecting hole is the introduction angle, and the angle of the introduction angle is 30°; a chamfer is provided on the outer side of the other end of the exoskeleton, and the angle of the chamfer is 20°;

[0015] When the bushing is assembled with the connecting bracket, the bushing is pressed into the connecting hole of the connecting bracket by matching the chamfer of the end of the outer skeleton with the lead-in angle of the end of the connecting hole, until the circular flange of the outer skeleton of the bushing fits with the end of the connecting hole of the connecting bracket, and the outer circumferential surface of the bushing is interference fit with the connecting hole of the connecting bracket.

[0016] Beneficial effects:

[0017] (1) The anti-torsion swing arm of the utility model is connected to the transmission unit through the mounting hole of the connecting bracket, and the through hole of the inner frame of the bushing is connected to the vehicle body. It is arranged at the center position of the front side of the transmission unit to provide auxiliary support and vibration reduction for the transmission unit. Among them, the bushing of the utility model is formed by a reduction process and can be deformed by 1.5mm. The reduction deformation of the bushing can effectively control the output center displacement of the transmission unit side under extreme working conditions, thereby reducing the risk of wear of the output center gear on the transmission unit side.

[0018] (2) The bushing of the utility model further comprises two inserts, and the two inserts are symmetrically arranged on both sides of the inner frame and located between the inner frame and the outer frame, which can improve the stiffness of the bushing along its radial direction.

[0019] (3) Both ends of the rubber main spring of the utility model are concave, which reserves an extrusion space for the rubber main spring to deform, thereby improving the reliability of the deformation of the rubber main spring.

[0020] (4) A lateral limit structure is provided at the end of the rubber main spring of the utility model, which can reduce the lateral impact contact noise of the anti-torsion swing arm.

[0021] (5) The transition rib of the utility model is provided with weight-reducing holes on both sides, which can reduce the weight of the transition rib while ensuring the strength of the transition rib.

[0022] (6) The inner side of the end of the connection hole of the utility model is provided with a guide angle, and the outer side of the end of the outer frame is provided with a chamfer, so as to facilitate the press-fitting of the bushing and the connection bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural composition diagram of the utility model;

[0024] Figure 2 This is a structural diagram of the connecting bracket of the utility model;

[0025] Figure 3 It is a cross-sectional view of the bushing of the utility model;

[0026] Figure 4 It is the appearance diagram of the bushing of the utility model;

[0027] Among them, 1. connecting bracket, 11. mounting hole, 12. transition rib, 13. weight reduction hole, 14. connecting hole, 15. introduction angle; 2. bushing, 21. outer frame, 22. inner frame, 23. insert, 24. rubber main spring; 211. circular flange, 212. chamfer, 241. lateral limiting structure. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0029] This embodiment provides an anti-torsion swing arm for an electric transmission unit, see the attached Figure 1 , comprising a connecting bracket 1 and a bushing 2; the bushing 2 is press-fitted on the connecting bracket 1; and the connecting bracket 1 is used to connect with the transmission unit, and the bushing 2 is used to connect with the vehicle body;

[0030] See attached Figure 2The connecting bracket 1 includes: a connecting plate and a transition rib 12; one end of the transition rib 12 is fixed on the connecting plate, and the length direction of the transition rib 12 is perpendicular to the plate surface of the connecting plate; the other end of the transition rib 12 is processed with a connecting hole 14, and the axis of the connecting hole 14 is perpendicular to the plate surface of the transition rib 12; the connecting hole 14 is used for press-fitting the bushing 2;

[0031] In a preferred solution, the connecting plate is provided with two rows of mounting holes 11, which are respectively located on both sides of the transition rib 12 and are used to connect with the transmission unit; and the axis of each mounting hole 11 is perpendicular to the plate surface of the connecting plate;

[0032] In a preferred solution, both sides of the transition rib 12 are provided with weight-reducing holes 13;

[0033] In a preferred solution, an introduction slope is provided on the inner side of the end of the connecting hole 14, and the included angle between the introduction slope and the axis of the connecting hole 14 is an introduction angle 15, the angle of the introduction angle 15 is 30°, and the length of the right angle side corresponding to the introduction angle 15 is 5 mm;

[0034] See attached Figure 3-Figure 4 The bushing 2 includes: an outer frame 21, an inner frame 22, an insert 23 and a rubber main spring 24; the inner frame 22 is installed in the outer frame 21, and the two inserts 23 are installed between the outer surface of the inner frame 22 and the inner surface of the outer frame 21. The outer frame 21, the inner frame 22 and the insert 23 are vulcanized into an integrated structure through the rubber main spring 24;

[0035] In a preferred solution, the exoskeleton 21 is a cylindrical thin-walled stamping structure, one end of the exoskeleton 21 is provided with a circular flange 211, and the other end of the exoskeleton 21 is provided with a chamfer 212 on the outside, the angle of the chamfer 212 is 20°, and the length of the right-angle side corresponding to the chamfer 212 is 2 mm;

[0036] In a preferred solution, the inner frame 22 is a columnar structure, and the cross section of the columnar structure is a rounded rhombus, that is, each corner of the rhombus is chamfered; the center of the inner frame 22 is processed with a through hole along its length direction, and the through hole is used to connect with the vehicle body; when the inner frame 22 is installed in the outer frame 21, the center line of the inner frame 22 is coaxial with the axis of the outer frame 21;

[0037] In a preferred solution, the insert 23 is an arc-shaped thin sheet. When the insert 23 is installed between the outer surface of the inner frame 22 and the inner surface of the outer frame 21, the insert 23 is coaxial with the outer frame 21, and the two inserts 23 are symmetrically arranged on both sides of the inner frame 22, thereby improving the stiffness of the bushing 2 along its radial direction. Figure 4 Indicated by the direction of the arrow.

[0038] In a preferred solution, the rubber main spring 24 is filled between the inner surface of the outer frame 21 and the outer surface of the inner frame 22, and the insert 23 between the outer frame 21 and the inner frame 22 is fixed; and the two ends of the rubber main spring 24 are both concave, reserving extrusion space for the rubber main spring 24 to deform. In this embodiment, under the deformation of the rubber main spring 24, the bushing 2 can be deformed to shrink by 1.5 mm, and the reduction of 1.5 mm means that the radius is reduced by 1.5 mm; and the end of the rubber main spring 24 on the same side as the circular flange 211 covers the circular flange 211 of the outer frame 21 and protrudes by a certain thickness. The protruding part serves as a lateral limiting structure 241 of the anti-torsion swing arm to reduce the lateral impact contact noise of the anti-torsion swing arm.

[0039] In a preferred solution, the rubber main spring 24 is made of natural rubber with a hardness of 65 degrees Shore hardness.

[0040] When the bushing 2 is assembled with the connecting bracket 1, the bushing 2 is pressed into the connecting hole 14 of the connecting bracket 1 by matching the chamfer 212 at the end of the outer skeleton 21 with the introduction angle 15 at the end of the connecting hole 14, until the circular flange 211 of the outer skeleton 21 of the bushing 2 fits with the end of the connecting hole 14 of the connecting bracket 1, and the outer circumferential surface of the bushing 2 is interference fit with the connecting hole 14 of the connecting bracket 1.

[0041] When the anti-torsion swing arm is working, the mounting hole 11 on the connecting plate of the connecting bracket 1 is connected to the transmission unit, and the through hole in the center of the inner frame 22 of the bushing 2 is connected to the vehicle body. It is arranged at the front center of the transmission unit. The anti-torsion swing arm is used to provide auxiliary support and vibration reduction for the transmission unit, and can effectively control the pitch direction and longitudinal movement of the transmission unit; that is, the anti-torsion swing arm can effectively control the output center displacement of the transmission unit side under extreme working conditions while providing auxiliary support and vibration reduction for the transmission unit, thereby reducing the risk of wear of the output center gear on the transmission unit side; it solves the problem of excessive displacement of the output center on both sides of the transmission unit under conditions such as rapid acceleration, deceleration, and impact, which leads to gear grinding and damage of the transmission gear.

[0042] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An anti-torsion swing arm of an electric transmission unit, characterized in that: include: Connecting bracket and bushing; the bushing is interference fit on the connecting bracket; and the connecting bracket is used to connect with the transmission unit, and the bushing is used to connect with the vehicle body; wherein the bushing is formed by a reduction process, and comprises: an outer frame, an inner frame and a rubber main spring; the inner frame is installed in the outer frame, and the outer frame and the inner frame are vulcanized into an integrated structure through the rubber main spring.

2. The anti-torsion swing arm of an electric transmission unit according to claim 1, characterized in that: The outer frame is a cylindrical thin-walled stamping structure, and one end of the outer frame is provided with a circular flange.

3. The anti-torsion swing arm of an electric transmission unit according to claim 2, characterized in that: The inner frame is a columnar structure, the cross section of which is a rounded rhombus, i.e., each corner of the rhombus is chamfered; a through hole is processed in the center of the inner frame along its length, and the through hole is used to connect to the vehicle body; when the inner frame is installed in the outer frame, the center line of the inner frame is coaxial with the axis of the outer frame.

4. The anti-torsion swing arm of an electric transmission unit according to claim 3, characterized in that: The bushing also includes two inserts, which are arc-shaped thin sheets installed between the outer surface of the inner frame and the inner surface of the outer frame. The insert is coaxial with the outer frame, and the two inserts are symmetrically arranged on both sides of the inner frame.

5. The anti-torsion swing arm of an electric transmission unit according to claim 4, characterized in that: The rubber main spring is filled between the inner surface of the outer frame and the outer surface of the inner frame, and fixes the insert between the outer frame and the inner frame; and both ends of the rubber main spring are concave, reserving extrusion space for deformation of the rubber main spring; and the end of the rubber main spring on the same side as the circular flange covers the circular flange of the exoskeleton and protrudes by a certain thickness, and the protruding part serves as a lateral limiting structure of the anti-torsion swing arm.

6. An anti-torsion swing arm of an electric transmission unit according to any one of claims 1 to 5, characterized in that: The rubber main spring is made of natural rubber with a hardness of 65 degrees Shore hardness.

7. The anti-torsion swing arm of an electric transmission unit according to claim 2, characterized in that: The connecting bracket includes: a connecting plate and a transition rib; one end of the transition rib is fixed on the connecting plate, and the length direction of the transition rib is perpendicular to the plate surface of the connecting plate; the other end of the transition rib is processed with a connecting hole, and the axis of the connecting hole is perpendicular to the plate surface of the transition rib; the connecting hole is used for press-fitting a bushing.

8. The anti-torsion swing arm of an electric transmission unit according to claim 7, characterized in that: The connection plate is provided with two rows of mounting holes, which are respectively located on both sides of the transition rib and are used to connect with the transmission unit; and the axis of each mounting hole is perpendicular to the plate surface of the connection plate.

9. The anti-torsion swing arm of an electric transmission unit according to claim 7, characterized in that: Both sides of the transition rib are provided with weight-reducing holes.

10. The anti-torsion swing arm of an electric transmission unit according to claim 7, characterized in that: An introduction slope is provided on the inner side of the end of the connecting hole, and the angle between the introduction slope and the axis of the connecting hole is the introduction angle, and the angle of the introduction angle is 30°; a chamfer is provided on the outer side of the other end of the exoskeleton, and the angle of the chamfer is 20°; When the bushing is assembled with the connecting bracket, the bushing is pressed into the connecting hole of the connecting bracket by matching the chamfer of the end of the outer skeleton with the lead-in angle of the end of the connecting hole, until the circular flange of the outer skeleton of the bushing fits with the end of the connecting hole of the connecting bracket, and the outer circumferential surface of the bushing is interference fit with the connecting hole of the connecting bracket.

Images