Mounting structure for a hook shock absorber that can be pushed up with small tightening torque in a compact space

Abstract

The present invention relates to a mounting structure for a hook shock absorber that can be pushed up in a compact space with a small tightening torque, comprising a stud bolt that passes through a mounting hole in a vehicle body structure, a nut that is screwed into a first end of the stud bolt, a biasing nut that is screwed into a second end of the stud bolt and has several axial screw holes arranged along the circumferential direction, and several biasing screws that are screwed into the axial screw holes arranged in the circumferential direction of the biasing nut and have heads that abut the hook shock absorber via a hard gasket to clamp and fix it to the vehicle body structure. By fitting and using the stud bolt, the nut, the biasing nut, and several biasing screws, the present invention realizes the stud bolt penetrating from the hook side to the vehicle body side, and tightens several small screws (the vehicle body side has a small cavity and cannot be subjected to a tightening torque operation) on the hook shock absorber side, solving the problem that the closed space on the vehicle body side is small and the bolt cannot penetrate from the vehicle body side to the hook side.

Description

[Technical field]

[0001] The present invention relates to a mounting structure for a hook shock absorber that can be pushed up with a small tightening torque in a compact space, and belongs to the field of mounting structure technology for a hook shock absorber. [Background technology]

[0002] The hook shock absorber is a vehicle part that engages the vehicles with each other to transmit traction and braking forces and mitigate longitudinal impact forces. It is an integrated unit consisting of parts such as a hook, a shock absorber, a hook tail frame, and a sub-board, and is installed inside the traction beam at the end of the undercarriage framework.

[0003] Through a search, it is found that Chinese invention patent CN207875667U discloses a mounting board and hook mounting structure, in which a groove is provided on one side of the mounting board, the groove is used to accommodate a nut and can limit the rotation of the nut, and a bolt mounting hole is provided at the bottom of the groove, so that the hook can be quickly and conveniently mounted and removed without the need for other tools in the limited mounting space of the vehicle chassis. The patent focuses on the groove structure of the mounting board to prevent the fastener from rotating, and does not consider the use of a small mounting fastening torque, and the mounting space behind it is a transparent area, which is not limited by the mounting operation space. Summary of the Invention [Problem to be solved by the invention]

[0004] The object of the present invention is to mainly address the problems in the prior art mentioned above, and to provide an installation structure for a hook shock absorber that can be pushed up with a small tightening torque in a compact space, by adopting a fitting method of a stud bolt and a push-up nut, thereby realizing the installation of the hook shock absorber with a small tightening torque under compact operating space conditions. [Means for solving the problem]

[0005] In order to solve the above technical problems, the mounting structure of the hook shock absorber provided in the present invention can be pushed up in a compact space with a small tightening torque, A stud bolt that penetrates a mounting hole in the vehicle body structure; a nut threaded onto a first end of the stud bolt; a biasing nut that is screwed onto the second end of the stud bolt and has a number of axially threaded holes disposed along a circumferential direction; and several biasing screws which are screwed into axially threaded holes arranged in the circumferential direction of the biasing nut and whose heads abut the hook shock absorber via a hard gasket to clamp and fix it to the vehicle body structure. Effect of the Invention

[0006] The beneficial effects of the present invention are as follows:

[0007] The present invention uses a stud bolt, a nut, a push-up nut, and several push-up screws to be fitted together, thereby enabling the stud bolt to penetrate from the hook side to the vehicle body side, and several small screws (the vehicle body side has a small cavity and cannot be tightened) are tightened on the hook shock absorber side, solving the problem that the closed space on the vehicle body side is small and the bolt cannot penetrate from the vehicle body side to the hook side.

[0008] A small screw uses a small tightening torque, which generates several upward forces that act on the hardened gasket, achieving a strong clamping force. Moreover, these several upward forces are combined to generate a single tensile force of the same magnitude on the stud bolt, enabling the installation of the hook shock absorber. This solves the problem of stress concentration at the base of the bolt, which is caused by the need to apply a large tightening torque to the base of the bolt as in the conventional structure, which uses a bolt to penetrate from the hook side to the vehicle body side.

[0009] A boss is pre-installed on the hook side of the stud bolt, and the boss can be used with a small wrench to dismantle the stud bolt and complete the removal of the hook shock absorber.

[0010] The present invention further requires protection of the hook shock absorber, and is characterized in that the hook shock absorber is fixed to a vehicle body structure 8 by the mounting structure for the hook shock absorber according to any one of claims 1 to 5.

[0011] The present invention is characterized in that it requires further protection of a rail car and has a mounting structure for a hook shock absorber according to any one of claims 1 to 5. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a schematic view showing the installation of the hook shock absorber of the present invention; [Diagram 2] 1 is a cross-sectional view of the mounting structure of the hook shock absorber of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be explained in detail with reference to the drawings.

[0014] The mounting structure of the hook shock absorber of this embodiment, which can be pushed up with a small tightening torque in a compact space, is as follows: An M36 stud bolt 3 that penetrates an attachment hole 7 of a vehicle body structure 8 and has a boss 30 pre-installed on the hook side; A nut 1 is screwed onto a first end of a stud bolt 3, and a tooth gasket 2 is installed between the nut 1 and a vehicle body structure 8 (the nut 1 and the tooth gasket may be integrated into one piece); a biasing nut 5 screwed onto the second end of the stud bolt 3 and having several axially threaded holes arranged along the circumferential direction; and six biasing screws 6 which are screwed into axially threaded holes arranged in the circumferential direction of the biasing nuts 5 and whose heads abut the hook shock absorber 9 via the hard gasket 4 to clamp and fix it to the body structure 8.

[0015] The functioning principle is as follows. -->M36 stud bolt 3 is used, and it is tightened by pushing up nut 5 and pushing up screw 6. --> By tightening the push-up screws 6, a push-up force (axial direction) is generated, and this push-up force acts directly on the hard gasket 4. Although the friction diameter of each push-up screw 6 is small and the tightening torque used is also small, the push-up forces of several push-up screws 6 are combined and react to the push-up nuts 5, and further form a large reaction force on the stud bolt 3, -->The pushing-up force of the screw 6 and the counter-acting force of the stud bolt 3 generate the necessary clamping force between the hard gasket 4, the hook shock absorber, and the connection surface of the car body. -->The toothed gasket 2 is used to ensure that the hook shock absorber is not loosened when installed.

[0016] The hook shock absorber of the rail car is attached using the attachment structure of the hook shock absorber of the present embodiment, Step 1 of hoisting the hook shock absorber 9 to a mounting location on the vehicle body; Step 2: the stud bolt 3 is inserted through the mounting hole 7 of the vehicle body structure 8 and the mounting hole of the hook shock absorber 9, and the tooth gasket 2 and the nut 1 are screwed onto the first end of the stud bolt 3; Step 3: fitting the hard gasket 4 onto the second end of the stud bolt 3 from the outside, and screwing the push-up nut 5 onto the second end of the stud bolt 3, and then tightening the push-up screw 6 to abut against the outer end surface of the hook shock absorber 9; in step 3, turning the push-up screw 6 with a torque wrench, the fixing torque is about 70 N.m; and step 4 of making a tightening mark after confirming that the gap value between the hard gasket 4 and the nut 5 to be pushed up is within a design range.

[0017] The method for removing the hook shock absorber of a rail car is as follows: Step 1, which lifts the hook shock absorber and ensures that it will not fall after dismantling the fastener; Step 2 is to use a torque wrench to loosen the push-up screw 6 and separate it from the hard gasket 4; Step 3 is to loosen and dismantle the nut 5, which can be manually pushed up; Step 4 is to loosen the stud bolt 3 and remove the stud bolt 3, the nut 1 and the tooth gasket 2; and step 5 of disconnecting and removing the hook shock absorber.

[0018] In addition to the above embodiments, the present invention may have other embodiments. Any technical solutions formed by adopting equivalent substitution or equivalent transformation are within the scope of protection of the present invention. [Explanation of symbols]

[0019] 1 Pillow beam 2 floor connecting beams 3 corrugated floor 4 side beams 5 Fasteners

Claims

1. A stud bolt (3) that penetrates a mounting hole (7) of a vehicle body structure (8); A nut (1) screwed onto a first end of a stud bolt (3); a biasing nut (5) screwed onto the second end of the stud bolt (3) and having several axially threaded holes arranged along the circumferential direction; a number of biasing screws (6) which are screwed into the axially threaded holes of the biasing nuts (5) arranged in the circumferential direction and whose heads abut the hook shock absorber (9) via the hard gasket (4) to clamp and fix it to the vehicle body structure (8); The stud bolt (3) has a boss (30) pre-installed on the hook side. A mounting structure for a hook shock absorber.

2. The mounting structure of the hook shock absorber according to claim 1, characterized in that a toothed gasket (2) is installed between the nut (1) and the vehicle body structure (8).

3. The mounting structure for a hook shock absorber according to claim 1, characterized in that there are six of said biasing screws (6).

4. The mounting structure of the hook shock absorber according to claim 2, characterized in that the nut (1) and the toothed gasket are integrally formed.

5. A hook shock absorber, which is fixed to a vehicle body structure (8) by the mounting structure for the hook shock absorber according to any one of claims 1 to 4.

6. A rail car comprising the mounting structure for a hook shock absorber according to any one of claims 1 to 4.

7. The method of fixing the hook shock absorber using the mounting structure of any one of claims 2 to 4 includes the following steps: Step 1: hoisting the hook shock absorber (9) to a mounting location on the vehicle body; Step 2: a stud bolt (3) is inserted through a mounting hole (7) of a vehicle body structure (8) and a mounting hole of a hook shock absorber (9), and a tooth gasket (2) and a nut (1) are screwed onto a first end of the stud bolt (3); Step 3: fitting a hard gasket (4) onto the second end of the stud bolt (3) from the outside, and screwing a push-up nut (5) onto the second end of the stud bolt (3), and then tightening a push-up screw (6) so that the push-up screw (6) abuts against an outer end surface of a hook shock absorber (9); and (4) creating a fastening mark after confirming that the gap value between the hard gasket (4) and the nut (5) to be pushed up is within a design range.

8. The method for mounting a hook shock absorber of a rail car according to claim 7, characterized in that in step 3, a torque wrench is used to turn the screw (6) to be pushed up, and the fixing torque is about 70 N.m.

9. The use of the mounting structure for the hook shock absorber according to any one of claims 2 to 4 includes the following steps: Step 1: lifting the hook shock absorber and ensuring that it does not fall after dismantling the fastener; Step 2, using a torque wrench to loosen the push-up screw (6) and separate it from the hard gasket (4); Step 3: Loosening and dismantling the manually-pushed nut (5); Step 4: loosening the stud bolt (3) and removing the stud bolt (3), the nut (1) and the tooth gasket (2); 5. A method for removing a hook shock absorber of a rail car, comprising the steps of: removing and removing the hook shock absorber.

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