COUPLER BUFFER DEVICE MOUNTING STRUCTURE WITH SMALL-FASTENING-TORQUE PUSHING UNDER COMPACT SPACE

Abstract

A coupler buffer device mounting structure for small-fastening-torque pushing under a compact space includes a double-headed stud passing through an installation fabrication hole of a vehicle body structure; a nut screwed on a first end of the double-headed stud; a push nut screwed on a second end of the double-headed stud and provided with a plurality of axial screw holes in a circumferential direction; and a plurality of push screws screwed into the circumferentially provided axial screw holes of the push nut, where the coupler buffer device is clamped and fixed to the vehicle body structure by heads abutting against the coupler buffer device via a hard washer. The coupler buffer device mounting structure achieves the passing of the double-headed stud from a coupler side to a vehicle body side by using the double-headed stud, the nut, the push nut and the plurality of push screws in combination.

Claims

1-10. (canceled)

11. A coupler buffer device mounting structure, comprising: a double-headed stud passing through an installation fabrication hole of a vehicle body structure; a nut screwed on a first end of the double-headed stud; a push nut screwed on a second end of the double-headed stud and provided with a plurality of axial screw holes in a circumferential direction; and a plurality of push screws screwed into the plurality of axial screw holes of the push nut, wherein a coupler buffer device is clamped and fixed to the vehicle body structure by heads of the plurality of push screws abutting against the coupler buffer device via a hard washer.

12. The coupler buffer device mounting structure according to claim 11, wherein a toothed washer is arranged between the nut and the vehicle body structure.

13. The coupler buffer device mounting structure according to claim 11, wherein a number of the plurality of push screws is six.

14. The coupler buffer device mounting structure according to claim 12, wherein the nut is integral with the toothed washer.

15. The coupler buffer device mounting structure according to claim 11, wherein the double-headed stud is pre-formed with a raised head on a coupler side.

16. A rail vehicle having a coupler buffer device mounting structure according to claim 11.

17. A method for mounting a coupler buffer device of a rail vehicle, wherein the operation of fixing by the coupler buffer device mounting structure according to claim 12 comprises the steps of: step 1, lifting the coupler buffer device to a vehicle body installation position; step 2, allowing the double-headed stud through the installation fabrication hole of the vehicle body structure and an installation hole of the coupler buffer device, and screwing the toothed washer and the nut on the first end of the double-headed stud; step 3, sleeving the hard washer on the second end of the double-headed stud from an outside, screwing the push nut on the second end of the double-headed stud, and tightening a push screw, wherein the push screw abuts against an outer end face of the coupler buffer device; and step 4, checking that a clearance value between the hard washer and the push nut is within a design range and marking the tightening.

18. The method for mounting the coupler buffer device of the rail vehicle according to claim 17, wherein the push screw is screwed by a torque wrench in step 3, and a restraining moment is set to about 70 N. m.

19. A method for dismounting a coupler buffer device of a rail vehicle, wherein the operation of performing by the coupler buffer device mounting structure according to claim 12 comprises the steps of: step 1, suspending the coupler buffer device to make the coupler buffer device does not fall off after a fastener is removed; step 2, unscrewing a push screw by using a torque wrench to disengage the push screw from the hard washer; step 3, manually unscrewing and removing the push nut; step 4, unscrewing the double-headed stud and removing the double-headed stud, the nut and the toothed washer; and step 5, dismounting and removing the coupler buffer device.

20. The rail vehicle having the coupler buffer device mounting structure according to claim 16, wherein in the coupler buffer device mounting structure, a toothed washer is arranged between the nut and the vehicle body structure.

21. The rail vehicle having the coupler buffer device mounting structure according to claim 16, wherein in the coupler buffer device mounting structure, a number of the plurality of push screws is six.

22. The rail vehicle having the coupler buffer device mounting structure according to claim 20, wherein in the coupler buffer device mounting structure, the nut is integral with the toothed washer.

23. The rail vehicle having the coupler buffer device mounting structure according to claim 16, wherein in the coupler buffer device mounting structure, the double-headed stud is pre-formed with a raised head on a coupler side.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG. 1 is a schematic view showing the mounting of a coupler buffer device according to the present invention;

[0018] FIG. 2 is a sectional view of a coupler buffer device mounting structure according to the present invention.

[0019] The reference numbers in the drawings are as follows. [0020] 1sleeper beam, 2floor connection beam, 3corrugated floor, 4side beam, 5fastener, 6push screw, 7installation fabrication hole, 8vehicle body structure, 9coupler buffer device.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Hereinafter, embodiments of the present invention will be explained with reference to the accompanying drawings.

[0022] A coupler buffer device mounting structure for small-fastening-torque pushing under a compact space according to the present example is characterized by including: [0023] an M36 double-headed stud 3 passing through an installation fabrication hole 7 of a vehicle body structure 8, wherein the double-headed stud 3 is pre-formed with a raised head 30 on a coupler side; [0024] a nut 1 screwed on a first end of the double-headed stud 3, wherein a toothed washer 2 is arranged between the nut 1 and the vehicle body structure 8 (the nut 1 and the toothed washer may also be in the form of an integral piece); [0025] a push nut 5 screwed on a second end of the double-headed stud 3 and provided with a plurality of axial screw holes in a circumferential direction; and [0026] six push screws 6 screwed into the circumferentially provided axial screw holes of the push nut 5, wherein the coupler buffer device 9 is clamped and fixed to the vehicle body structure 8 by heads abutting against the coupler buffer device 9 via a hard washer 4.

Functional Principles

[0027] With the double-headed stud 3 of the M36, the fastening is achieved by means of an push nut 5 and an push screw 6; [0028] By tightening the push screw 6, a jacking force (axial) is generated, which acts directly on the hard washer 4. Each push screw 6 has a small friction diameter and a small fastening torque, but the jacking forces of a plurality of push screws 6 combine to react the push nut 5, which in turn creates a large reaction force on the double-headed stud 3. [0029] The jacking force of the push screw 6, together with the jacking force of the double-headed stud 3, produces a required clamping force on the joint surfaces of the hard washer 4, the coupler buffer device and the vehicle body. [0030] With the toothed washer 2, the looseness prevention of the mounting and fastening of the coupler buffer device is ensured.

[0031] Mounting a coupler buffer device of a rail vehicle with the coupler buffer device mounting structure of this example includes the steps of: [0032] step 1, lifting a coupler buffer device 9 to a vehicle body installation position; [0033] step 2, allowing a double-headed stud 3 through an installation fabrication hole 7 of a vehicle body structure 8 and an installation hole of the coupler buffer device 9, and screwing a toothed washer 2 and a nut 1 on a first end of the double-headed stud 3; [0034] step 3, sleeving a hard washer 4 on a second end of the double-headed stud 3 from the outside, screwing a push nut 5 on a second end of the double-headed stud 3, and then successively tightening a push screw 6, so that the push screw 6 abuts against an outer end face of the coupler buffer device 6; the push screw 6 is screwed by a torque wrench in step 3, and the restraining moment is set to about 70 N. m. [0035] step 4, checking that a clearance value between the hard washer 4 and the push nut 5 is within a design range and marking the tightening.

[0036] A method for disassembling a coupler buffer device of a rail vehicle includes the steps of: [0037] step 1, suspending the coupler buffer device to ensure that it does not fall off after a fastener is removed; [0038] step 2, unscrewing the push screw 6 by using a torque wrench to disengage same from a hard washer 4; [0039] step 3, manually unscrewing and removing a push nut 5; [0040] step 4, unscrewing a double-headed stud 3 and removing the double-headed stud 3, a nut 1 and a toothed washer 2; [0041] step 5, dismounting and removing the coupler buffer device.

[0042] In addition to the examples described above, other embodiments of the invention are possible. Any technical solution formed by equivalent substitution or equivalent transformation falls within the protection range claimed by the invention.