Elastic torque motor suspension structure for rail vehicles

Abstract

This patent relates to an elastic torsion motor suspension structure for rail vehicles, comprising two motors elastically suspended on a bogie, a torsion bar supported and fixed on the bogie, and the lower parts of the two motors are connected to the two ends of the torsion bar through transition structures. The present invention fully considers the characteristics that the two motors often exhibit large vertical vibrations and are phase-aligned, and adopts a suspension method that combines motor elastic suspension and torsion suspension. When the two motors vibrate vertically in the same manner, the torsion bar takes effect, and the vibration of the motor is converted into the internal force of the torsion bar. Under this working condition, the vibration of the motor does not affect the structure of the frame. When the motor vibrates laterally, the two elastic suspension nodes provide lateral support stiffness; in the longitudinal vibration load analysis, the longitudinal stop and the torsion bar jointly provide longitudinal support stiffness.

Description

Technical Field

[0001] This patent relates to an elastic torsion motor suspension structure for rail vehicles, which is used in the field of monorail transportation. Background Art

[0002] The motor is the heaviest suspended component on the bogie. Currently, motors in the urban rail transit vehicle industry are generally rigidly suspended, with one side of the motor rigidly bolted to the frame, creating a cantilevered structure. Actual service testing has revealed that under wheel-rail excitation, the two motors on a single bogie often exhibit significant vertical vibration, with phase alignment. Due to the motor's large mass and its center of mass, which is located far from the frame due to structural constraints, the vertical vibration of the motor generates significant loads, significantly impacting the frame structure and, in severe cases, causing structural failure near the motor mount.

[0003] After searching, it was found that Chinese utility model patent CN202222186729.5 discloses a drive device elastic suspension structure, frame and rail vehicle, which belongs to the field of drive device suspension technology, including a sleeve, a rubber cake is sleeved on the outer periphery of the sleeve, and a sleeve nut is arranged between the top of the sleeve and the upper rubber cake; the sleeve has a central cavity, a fastener is passed through the central cavity, and the fastener passes through the sleeve nut, and the fastener is connected to the drive device. This suspension structure can facilitate the assembly of the drive device on the frame suspension and prevent the problem of bolt breakage. It realizes the elastic suspension between the motor and the frame, but does not take into account the characteristics that the two motors often exhibit large vertical vibrations and are in phase. Therefore, the suspension structure of this patent performs poorly when the vertical vibration of the motor generates a large load. Summary of the Invention

[0004] The technical problem to be solved by this patent is: to overcome the deficiencies of the above-mentioned prior art and provide a rail vehicle elastic torsion motor suspension structure, which fully considers the characteristics that the two motors often exhibit large vertical vibrations and are phase-matched, and changes to a suspension method that combines motor elastic suspension and torsion suspension. The motor's unidirectional vertical vibration is converted into the internal force of the torsion bar, reducing the impact of the motor vibration on the frame.

[0005] The technical solution adopted by this patent to solve its technical problems is: a rail vehicle elastic torsion motor suspension structure, including two motors elastically suspended on a bogie, characterized in that it also includes a torsion bar supported and fixed on the bogie, and the lower parts of the two motors are connected to the two ends of the torsion bar through transition structures respectively, and the torsion bar is used to absorb the same vertical vibration of the two motors.

[0006] Furthermore, the torsion bar is rotationally symmetrical about its center and includes a transversely arranged torsion bearing portion and torsion arms connected to both ends of the torsion bearing portion. The torsion bearing portion is supported on the bogie via a torsion bar mounting seat. The two motors are connected to the torsion arms on corresponding sides of the torsion bar via transition structures.

[0007] The rail vehicle elastic torsion motor suspension structure comprises a longitudinal stopper arranged outside the torsion arm swing range for limiting the outward swing amplitude of the torsion arm.

[0008] The present invention changes the previous rigid motor suspension method to a suspension method that combines elastic motor suspension and torsion suspension. The upper part of the motor is suspended on the frame via two elastic nodes, and the lower mounting seat of the motor is connected to the torsion bar via a transition structure. When the two motors vibrate in the same vertical direction, the torsion bar takes effect, and the vibration of the motor is converted into the internal force of the torsion bar. Under this working condition, the vibration of the motor does not affect the structure of the frame. When the motor vibrates laterally, the two elastic suspension nodes provide lateral support stiffness; in longitudinal vibration load analysis, the longitudinal stop and torsion bar jointly provide longitudinal support stiffness. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG1 is a side view of the rail vehicle elastic torsion motor suspension structure of the present invention.

[0010] FIG2 is a top view of the rail vehicle elastic torsion motor suspension structure of the present invention.

[0011] FIG3 is a perspective view of the rail vehicle elastic torsion motor suspension structure of the present invention.

[0012] Figure 4 It is a three-dimensional diagram of the torsion bar of the suspension structure of the present invention.

[0013] The numbers in the figure are as follows:

[0014] 1-motor; 2-elastic hanging point; 3-transition structure; 31-motor connection interface; 32-torsion arm connection interface, 4-torsion bar; 41-torsion bearing part; 42-torsion arm; 5-torsion bar mounting seat; 6-longitudinal stop. DETAILED DESCRIPTION

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] like Figures 1 to 3As shown, the elastic torsion motor suspension structure for rail vehicles of the present invention includes an elastic suspension point 2 fixed to the upper portion of the upper housing of the motor 1, near the center of the bogie, and a torsion bar 4 supported above the bogie crossbeam via a torsion bar mounting base 5. The motor 1 is suspended from the bogie frame via the elastic suspension point 2, while the torsion bar 4 provides torsion suspension.

[0017] Specifically, the torsion bar 4 (such as Figure 4 The torsion bar mounting bracket 5 (shown in the figure) is rotationally symmetrical and includes a transversely arranged torque-bearing portion 41 and torsion arms 42 connected to both ends of the torque-bearing portion 41. The torque-bearing portion 41 is supported on the bogie via a torsion bar mounting bracket 5. In this embodiment, a rubber spherical bearing (elastic node) is installed within the torsion bar mounting bracket 5, securing the torque-bearing portion 41 to the torsion bar mounting bracket 5 via the rubber spherical bearing. As shown in the figure, the torsion bar mounting bracket 5 has two symmetrical bearings, one at each end of the torque-bearing portion 41. Alternatively, the rubber spherical bearings can be replaced with ball bearings or needle bearings.

[0018] The lower mounting base of motor 1 is connected to the torsion bar via a transition structure 3. Specifically, transition structure 3 is connected to the torsion arms 42 on the corresponding sides of torsion bar 4, partially offsetting the common vertical vibration of both motors 1. In this example, transition structure 3 is a rigid structure, including a motor connection interface 31 fixed to motor 1 and a torsion arm connection interface 32 fixed to torsion arm 32.

[0019] In order to limit the swing amplitude of the torsion arm 42, the present invention also includes a longitudinal stop 6 arranged outside the swing range of the torsion arm 42 for limiting the outward swing amplitude of the torsion arm 42. The longitudinal stop 6 is fixed to the bogie frame. In the absence of external force, the angle formed between the two torsion arms 42 is 6° (the initial angle is preset to 4°-8° based on the mass of the motor, the stiffness of the torsion bar and the geometric dimensions). After the motor is installed, the angle formed between the torsion arms 42 is 5°. During the operation of the vehicle, due to the bumps of the route, the motor will generate synchronous vertical vibrations, which are converted into internal forces of the torsion bar. Under this working condition, the vibration of the motor does not affect the structure of the frame.

[0020] When the motor vibrates laterally, the two elastic suspension nodes provide lateral support stiffness; in longitudinal vibration load analysis, the longitudinal stop and torsion bar jointly provide longitudinal support stiffness.

[0021] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A rail vehicle elastic torsion motor suspension structure, comprising two motors (1) elastically suspended on a bogie, characterized in that: It also includes a torsion bar (4) supported and fixed on the bogie, and the lower parts of the two motors (1) are connected to the two ends of the torsion bar (4) through transition structures (3) respectively; The torsion bar (4) is rotationally symmetrical about the center, and comprises a transversely arranged torsion bearing portion (41) and torsion arms (42) connected to both ends of the torsion bearing portion (41); the torsion bearing portion (41) is supported on the bogie via a torsion bar mounting seat (5); The two motors (1) are respectively connected to the torsion arms (42) on corresponding sides of the torsion bar (4) through a transition structure (3).

2. The rail vehicle elastic torsion motor suspension structure according to claim 1, characterized in that: The transition structure (3) is a rigid structure, comprising a motor connection interface (31) fixed to the motor (1), and a torsion arm connection interface (32) fixed to the torsion arm (42).

3. The rail vehicle elastic torsion motor suspension structure according to claim 1, characterized in that: The torsion bearing portion (41) is supported on the torsion bar mounting seat (5) via a rubber joint bearing, a ball bearing, or a needle bearing.

4. The rail vehicle elastic torsion motor suspension structure according to claim 1, characterized in that: The torsion bar mounting seat (5) is fixed to the upper surface of the bogie crossbeam.

5. The rail vehicle elastic torsion motor suspension structure according to claim 1, characterized in that: It comprises a longitudinal stopper (6) arranged outside the swing range of the torsion arm (42) and used for limiting the outward swing amplitude of the torsion arm (42).

6. The rail vehicle elastic torsion motor suspension structure according to claim 1, characterized in that: When no force is applied, the angle between the torsion arms (42) is 4°-8°.

7. The rail vehicle elastic torsion motor suspension structure according to claim 1, characterized in that: The motor (1) is hung on the bogie via an elastic hanging point (2).

8. The rail vehicle elastic torsion motor suspension structure according to claim 7, characterized in that: The elastic hanging point (2) is fixed to the upper part of the motor (1) housing on one side close to the center of the bogie.

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