A hanging device, a brake caliper unit using the device, and a hanging connection method

Abstract

The present application relates to a kind of brake clamp unit's hanging device, belong to rail transit technical field.The device is separated from each other front, rear hanging and hanging pin shaft are made of;Front hanging has the front main body vertically T-shaped;The lower portion of front main body is made with front wear and tear hole, and the upper portion both ends are made with front hanging hole respectively;Positioning rod is extended with anti-oscillation constraint plane and made in the rear portion of front wear and tear hole;Rear hanging has the rear main body T-shaped;The lower portion of rear main body is made with rear wear and tear hole, and the upper portion both ends are made with vertical rear hanging hole respectively;The both ends of hanging pin shaft are connected with front and rear wear and tear hole respectively;At least one end of hanging pin shaft is elastically tightly connected with one of front wear and tear hole and rear wear and tear hole, and the outer diameter between the both ends of hanging pin shaft is matched with the inner diameter of the mounting hole of clamp main body.The present application not only has good process, more importantly, can effectively reduce internal stress, thereby significantly prolong the fatigue life of brake clamp unit hanging device, and overall weight is significantly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of hanging device of brake caliper unit, especially a kind of split hanging connection assembly suitable for brake caliper unit of urban rail vehicle, also relates to brake caliper unit and hanging connection method using the device, belong to rail transit technical field. BACKGROUND

[0002] Brake caliper unit is an important component to ensure the safety of rail vehicle, its installation mode has three-point hoisting and four-point hoisting (see the paper of 2015 China Railway Society Vehicle Committee Fast Freight Car Brake Technology Exchange Meeting, "Application Research of Brake Caliper Unit and Brake Pad on Fast Freight Car"), the former needs larger bogie, so the installation space is larger;The latter is compact in structure, suitable for occasions with small brake installation space.

[0003] Due to the limitation of installation space, the applicant needs to choose four-point hoisting method. After fatigue test, it is found that compared with traditional three-point hoisting, the fatigue performance of four-point hoisting is decreased, and even the hanging piece is broken. In order to ensure safety, the applicant obtains the conclusion from the analysis of hanging stress: three-point hoisting can avoid internal stress caused by manufacturing and assembly errors in theory because it conforms to the geometric principle of three-point determining a plane, while four-point hoisting is theoretically over-positioned, which is easy to produce internal stress due to manufacturing and assembly errors, thereby leading to the decrease of fatigue resistance during vehicle operation (see Figure 10 In practice, the integral connection structure fastened by four connecting bolts may cause deformation of the connecting piece and internal stress due to excessive constraint. The existence of internal stress makes the connecting bolt not only bear tensile stress, but also bear shear stress. Under the joint action of shear stress and tensile stress, the fatigue life is greatly shortened. Bolt fracture has occurred in fatigue test. How to ensure that four-point hoisting has ideal fatigue resistance has become a difficult problem.

[0004] In addition, the four-point hoisting of the prior art is an integral connection assembly, four connecting points are arranged on one part, two cross beams are used to connect the front two hanging points with the rear two hanging points, and four connecting bolts are used to fix the brake caliper unit on the bogie. Its casting and machining are difficult because the process needs to consider the cooperation of multiple casting and machining references at the same time, which increases unnecessary materials and process cost, and the integral connection assembly is heavy in weight, which is difficult to adapt to the development needs of vehicle high speed and light weight.

[0005] According to the search, the Chinese patent with the application number 201922050720.X provides a hanging assembly for hanging a brake clamp unit containing the same on a bogie, which comprises: a hanging bracket, the upper part of which is configured as a suspension arm extending longitudinally, at least two first mounting through holes extending transversely are provided on the suspension arm; and the lower part of the hanging bracket is configured as two support arms extending vertically, each of the support arms is respectively provided with a second mounting through hole extending vertically; the two support arms are respectively located on both sides of the suspension arm; two mounting seats, which have at least two third mounting through holes extending transversely and at least two fourth mounting holes extending vertically on the mounting seats, and the mounting seats are respectively mounted on both sides of the suspension arm; and a hanging shaft, the middle part of which is inserted into the first mounting through hole of the suspension arm, and the end part of which is inserted into the third mounting through hole of the mounting seat. The technical solution further reduces the installation space by dividing the mounting seat of the hanging assembly into two parts, but since the two mounting seats need to be rigidly connected by the front and rear hanging shafts, a rigid structure is formed between the front and rear hanging assemblies on the same side, which cannot alleviate the fatigue caused by the front and rear direction jolt during vehicle operation. Therefore, the technical solution fails to properly solve the problem of poor four-point hanging fatigue resistance. SUMMARY

[0006] The purpose of the present application is to effectively inhibit the internal stress of the four-point hanging assembly and obtain ideal fatigue resistance by improving the structure, and to provide a brake clamp unit using the device and a hanging connection method thereof.

[0007] In order to achieve the above purpose, the basic technical scheme of the hanging device of the present application is as follows:

[0008] The hanging device is composed of a front hanging assembly, a rear hanging assembly and a hanging pin shaft, which are separated from each other;

[0009] The front hanging assembly has a front main body in vertical T shape; a horizontal front through hole is formed in the lower part of the front main body, and vertical front hanging holes are respectively formed at both ends of the upper part of the front main body; a positioning rod with an anti-oscillation constraint plane is extended from the rear part of the front hanging hole;

[0010] The rear hanging assembly has a rear main body in vertical T shape; a horizontal rear through hole is formed in the lower part of the rear main body, and vertical rear hanging holes are respectively formed at both ends of the upper part of the rear main body;

[0011] The two ends of the hanging pin shaft are respectively connected with the front through hole and the rear through hole; at least one end of the hanging pin shaft is elastically tightly connected with the front through hole or the rear through hole, and the outer diameter between the two ends of the hanging pin shaft is matched with the inner diameter of the mounting hole of the clamp body.

[0012] The brake clamp unit of the device comprises a pair of brake levers respectively hinged at the two sides of a clamp body, the clamp body is provided with a brake driving mechanism, and one end of the brake lever is provided with a brake shoe through a shoe bracket;

[0013] The clamp body is hung on the vehicle bogie through a hanging device, and the hanging device comprises a front hanging part and a rear hanging part separated from each other and a hanging pin shaft;

[0014] The front hanging part has a vertical T-shaped front body, a horizontal front through hole is formed in the lower part of the front body, vertical front hanging holes are respectively formed at the two ends of the upper part of the front body, and a positioning rod with an anti-oscillation constraint plane is extended from the upper surface of the rear part of the front through hole;

[0015] The rear hanging part has a vertical T-shaped rear body, and a horizontal rear through hole is formed in the lower part of the rear body, and vertical rear hanging holes are respectively formed at the two ends of the upper part of the rear body;

[0016] The front end of the hanging pin shaft is tightly matched with the front through hole, the rear end is elastically and tightly connected with the rear through hole, and the outer diameter between the two ends is matched with the inner diameter of the mounting hole of the clamp body.

[0017] The hanging connection method of the brake clamp unit of the device comprises the following steps:

[0018] First step, the front through hole of the front hanging part is interference-pressed to the front end of the hanging pin shaft, so as to become an integral whole;

[0019] Second step, the hanging pin shaft with the front hanging part is passed through the horizontal mounting hole of the clamp body from front to back until the shaft is limited;

[0020] Third step, the anti-oscillation constraint plane of the positioning rod is pressed on the clamp body of the brake clamp unit by means of the pressing plate tightly connected with the clamp body;

[0021] Fourth step, the rear hanging part is sleeved on the rear end of the hanging pin shaft, and is elastically and tightly connected by means of the connecting part;

[0022] Fifth step, the brake clamp unit is hung on the vehicle bogie by means of the fastener passing through the front hanging hole of the front body and the rear through hole of the rear body from bottom to top.

[0023] Compared with the prior art, the front and rear hangers are separated in the present application, which not only has good casting and machining process due to separate manufacturing, but also reduces manufacturing cost and improves product yield. More importantly, the axial and circumferential relative positions of the front and rear hanger separated structure on the hanger pin shaft can be adjusted as needed, so that the internal stress can be effectively reduced, thereby significantly prolonging the fatigue life of the brake clamp unit hanger device. In addition, the front and rear hanger separated structure eliminates the solid connection between the original hangers, so that the overall weight of the brake clamp unit separated connection assembly is significantly reduced, and the disassembly and debugging are more convenient, and the production of highly modularized and genealogical products can be realized at a lower mold cost, so that it can be applied to the interface requirements of different bogies to quickly respond to user needs. BRIEF DESCRIPTION OF DRAWINGS

[0024] The embodiments given below in conjunction with the drawings further illustrate the present application.

[0025] Figure 1 is a perspective structural schematic diagram of the assembled parts of an embodiment of the present application.

[0026] Figure 2 is Figure 1 is a cross-sectional view of the mounting structure of the brake clamp body of the embodiment.

[0027] Figure 3 is a perspective structural schematic diagram of the brake clamp unit of the embodiment. Figure 1

[0028] is Figure 4 is a perspective structural schematic diagram of the front hanger of the embodiment. Figure 1

[0029] is Figure 5 is a planar projection structural schematic diagram of the front hanger of the embodiment. Figure 1

[0030] is Figure 6 is a left view structural schematic diagram of the embodiment. Figure 5

[0031] is Figure 7 is a bottom view structural schematic diagram of the embodiment. Figure 6

[0032] Figure 8 is Figure 1 is a perspective structural schematic diagram of the rear hanger of the embodiment.

[0033] Figure 9 is Figure 1 is a planar projection structural schematic diagram of the rear hanger of the embodiment.

[0034] Figure 10 is a hoisting force diagram of the prior art. ​

[0035] Figure 11 is Figure 1 The lifting force diagram of the embodiment. DETAILED DESCRIPTION

[0036] Embodiment one

[0037] The hanging device D of the embodiment, as shown in Figure 1 and Figure 2 , comprises a front hanging 2 and a rear hanging 3 separated from each other and a hanging pin shaft 1 for connecting the clamp body J during installation.

[0038] The front hanging 2, as shown in Figures 4 to 7 , has a front body 2.1 vertically shaped as a T, and a horizontal front through hole 2.2 is made on the lower part of the front body 2.1. The front end face of the upper part of the front body 2.1 is shaped as a forward convex arc, and two vertical front hanging holes 2.4 are made on the two ends respectively. The rear part of the two front hanging holes 2.4 respectively extends a positioning rod 2.3 with a lower surface provided with an anti-oscillation constraint plane 2.31. As shown in FIG. 2 and FIG. 3, the anti-oscillation constraint plane 2.31 is used to cooperate with the pressing plate 6 fixed on the top of the clamp body J by the fastening screw 5.

[0039] The rear hanging 3, as shown in Figure 8 , Figure 9 , has a rear body 3.1 vertically shaped as a T, and a horizontal rear through hole 3.2 is made on the lower part of the rear body 3.1, and two vertical rear hanging holes 3.3 are made on the two ends of the upper part respectively.

[0040] It should be noted that the aforementioned front body 2.1 and rear body 3.1 are both vertically shaped as a T, which means that the vertical cross section of the front body 2.1 and the rear body 3.1 is roughly similar to a T shape. The front body 2.1 is connected by the upper part and the lower part which are roughly perpendicular to each other, and two vertical front hanging holes 2.4 are arranged on the two ends of the upper part, and the connecting horizontal plane between the two vertical front hanging holes 2.4 is lower than the top surface of the two vertical front hanging holes 2.4, which is beneficial to reduce the internal stress during connection.

[0041] The hanging pin shaft 1, as shown in Figure 2 , has a reduced diameter section 1.1 at the front end which is tightly fitted with the front through hole 2.2, and a tapered section 1.2 at the rear end which can be elastically tightly fitted with the rear through hole 3.2, and the taper is 1°-4°, preferably 2°-3°, and the rear end face of the hanging pin shaft 1 has an axial threaded hole. When the rear end face of the rear through hole 3.2 is pressed by the elastic butterfly spring washer 7 through the shaft end screw screwed into the axial threaded hole, it constitutes the elastic tight connection structure of the rear end of the hanging pin shaft 1 and the rear through hole 3.2 of the embodiment. The outer diameter of the middle section 1.3 between the two ends of the hanging pin shaft 1 is matched with the inner diameter of the installation hole of the clamp body J.

[0042] The specific structure of the elastic clamping connection structure comprises: the rear end face of the rear hanging 3 of the rear penetrating hole 3.2 is provided with a diameter expansion hole for accommodating the elastic butterfly spring washer 7, and the elastic butterfly spring washer 7 is sleeved on the tapered section 1.2 of the hanging pin shaft 1. In addition to the butterfly spring washer 7, there is also a flat washer, which is sleeved on the rod of the shaft end screw, and the front end face of the washer is in contact with the hanging pin shaft and the butterfly spring washer 7, and the rear end face of the washer is in contact with the flange face of the shaft end screw, that is, the shaft end screw is provided between the step of the rear hanging and the rear end face of the hanging pin shaft, and the washer is sleeved on the hanging pin shaft.

[0043] The structure of a brake caliper unit J using the hanging device D of the embodiment is shown in Figure 3 , which comprises a pair of brake levers J2 respectively hinged on both sides of a caliper body J1, one end of the brake lever J2 is provided with a brake pad through a pad carrier J4, and the other end is provided with a relief gap adjusting mechanism J3. The caliper body J1 with an internal brake driving mechanism has two mounting holes with copper sleeves 4 lined with sealing rings, and is hung on a vehicle bogie through the hanging device D. The inner surface groove of the two copper sleeves 4 is lined with sealing rings.

[0044] The hanging pin shaft of the hanging device D passes through the mounting hole of the caliper body J1, and the front hanging of the hanging device D is limited by the anti-oscillation constraint plane 2.31 of the positioning rod arranged on the front body and the pressing plate 6 fixed on the top of the caliper body J by the fastening screw 5, so as to limit the left and right oscillation of the brake caliper unit.

[0045] The detailed structure of the brake caliper unit J of the embodiment can be referred to the Chinese patent documents with application numbers 201120029779.1, 201220106387.5 and 201210075036.7, which will not be described in detail. It can be understood that the hanging device D of the embodiment can also be applied to brake caliper units of other structural forms, such as the brake driving mechanism can be independent of the caliper body, and the brake driving mechanism is provided with a relief gap adjusting mechanism, and the other end of the pair of brake levers J2 is connected with the cylinder end and the piston rod extension end of the brake driving mechanism respectively.

[0046] The following will be described in detail in combination with Figure 2 and Figure 3 , the hanging connection steps of the brake caliper unit using the hanging device D of the embodiment:

[0047] Firstly, the front penetrating hole 2.2 of the front hanging 2 is press-fitted into the front end of the hanging pin shaft 1, so that the two become an integral whole.

[0048] Secondly, the hanging pin shaft 1 with the front hanging 2 is passed through the horizontal mounting hole of the caliper body J from front to back until the axial limiting position shown in Figure 2 .

[0049] Third step, the anti-oscillation constraint plane 2.31 of the front hanging positioning rod 2.3 is pressed on the clamp body J1 of the brake clamp unit J by the pressing plate 6 connected with the clamp body J1 by the fastening screw 5.

[0050] Fourth step, the rear hanging 2 is fitted on the tapered section 1.2 of the rear end of the hanging pin shaft 1, and the rear end face of the rear through hole 3.2 is pressed by the elastic butterfly spring washer 7 through the shaft end screw, forming an elastic tight connection structure.

[0051] Fifth step, the brake clamp unit J is hung on the vehicle bogie by four fastening bolts which pass through the front hanging hole 2.4 of the front body 2 and the rear through hole 3.3 of the rear body 3 from bottom to top.

[0052] The preferred way of connecting the split type hanging device of the embodiment with the bogie is to first fasten the two hanging points of the front hanging, rotate the rear hanging, and then fasten the two hanging points of the rear hanging to find the appropriate posture.

[0053] The shaft end bolt can use the compression force of the disc spring to top the rear hanging on the tapered surface of the pin shaft. Under external intervention, the rear hanging can overcome the spring force and rotate around the hanging pin shaft. After fastening, the contact state of the split type hanging device connection assembly with the mounting hole of the clamp body, the hanging pin shaft and other parts can be adjusted by the disc spring. The internal stress caused by insufficient machining precision or part deformation after the fastening of the integral type connection assembly is overcome. When the vehicle is running, the brake clamp body follows the bogie to produce longitudinal, transverse and vertical vibrations. The high frequency vibration of the brake clamp body causes repeated impact on the connection assembly, which is also a test for the connection bolt. At this time, the flexible connection (i.e. elastic tight connection) between the rear hanging and the hanging pin shaft of the split type connection can reduce the impact caused by vibration and effectively avoid the damage of vibration to the connecting parts (such as connecting bolts).

[0054] As shown in Figure 11 The analysis shows that the gravity P received by the installed rear bogie is roughly P / 2 by the front and rear hangings. At this time, the elastic tight connection structure of the rear hanging of the split type hanging device does not completely constrain the freedom of rotation around the hanging pin shaft and axial movement, so even if there are some manufacturing and installation precision errors between the front and rear hangings, they can automatically adjust under the disturbance of vehicle operation, thereby eliminating the internal stress between the front and rear hangings and effectively avoiding the fatigue fracture of the brake clamp unit hanging device and its connecting bolts caused by internal stress during operation.

[0055] Tests show that the embodiment has the following characteristics:

[0056] 1) The relative position of the front and rear split hanging structure in the axial and circumferential direction of the hanging pin shaft can be adjusted as needed, so as to effectively reduce the internal stress and significantly prolong the fatigue life of the brake clamp unit hanging device;

[0057] 2) The flexible connection structure with elastic clamping at least makes one of the front and rear hanging positions of the front and rear split hanging structure have circumferential and axial self-adaptability, which is very beneficial to the fatigue resistance of the connecting bolt, and can also relieve vibration impact during train operation;

[0058] 2) The front hanging position is provided with an anti-yaw mechanism, which can effectively limit the yaw of the clamp unit, reduce the wear of the brake pad, and ensure the reliability of the brake and the safety of the vehicle operation;

[0059] 3) One end of the hanging pin shaft is fixed by interference pressing, and the other end is fixed by a small-angle taper section, an elastic disc spring, a gasket and an end screw, which is very convenient for disassembly, assembly and debugging;

[0060] 4) The front and rear split hanging structure not only eliminates the original solid connection between the front and rear parts, but also reduces the casting and machining difficulty, resulting in a weight reduction of 15% and a production cost reduction of 20%.

[0061] 5) The front and rear split hanging structure is convenient for modular design, can be applied to different bogie interfaces of different vehicle types, has a wide application range, effectively reduces the mold cost, improves the modularization degree of the product pedigree, and is convenient for quickly responding to user needs.

[0062] In addition to the above embodiments, the present application can also have other implementation manners. For example, the front hanging position also adopts a structure similar to the rear hanging position of the present embodiment; or the front and rear hanging structures of the present embodiment are interchanged; and the like. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope of the present application.

Claims

1. A hanging device, characterized in that: It consists of a front hanger and a rear hanger that are separate from each other, as well as a hanger pin. The front hanger has a vertically T-shaped front main body; the lower part of the front main body has a horizontal front mounting hole, and the upper two ends have vertical front hanging holes respectively; a positioning rod with an anti-sway constraint plane extends from the rear of the front hanging hole. The rear hanger has a vertically T-shaped rear main body; the lower part of the rear main body has a horizontal rear mounting hole, and the upper two ends have vertical rear hanging holes respectively. The two ends of the hanging pin are respectively used to connect to the front mounting hole and the rear mounting hole; at least one end of the hanging pin is elastically and tightly connected to the front mounting hole or the rear mounting hole, and the outer diameter between the two ends of the hanging pin is used to match the inner diameter of the mounting hole of the brake caliper body. The front end of the hanging pin is tightly fitted with the front mounting hole, and the rear end is elastically and tightly connected with the rear mounting hole; The front end of the hanging pin is a reduced-diameter section that fits tightly with the front mounting hole, and the rear end is a tapered section that can be elastically fitted with the rear mounting hole.

2. The hanging device according to claim 1, characterized in that: The front end of the hanging pin is elastically and tightly connected to the front fitting hole, and the rear end is tightly fitted to the rear fitting hole.

3. The hanging device according to claim 2, characterized in that: The front end of the hanging pin is a tapered section that can be elastically fitted with the front mounting hole, and the rear end is a reduced-diameter section that fits tightly with the rear mounting hole.

4. The hanging device according to claim 1, characterized in that: The front and rear ends of the hanging pin are elastically and tightly connected to the front and rear fitting holes, respectively.

5. The hanging device according to claim 4, characterized in that: The front and rear ends of the hanging pin are tapered sections that can be elastically fitted with the front and rear fitting holes, respectively.

6. The hanging device according to claim 5, characterized in that: The taper of the tapered section is 1°-4°.

7. The suspension device according to any one of claims 1 to 6, characterized in that: The elastic wedge connection is formed by screwing a shaft end screw into the axial threaded hole on the end face of the hanging pin shaft and pressing the end face of the corresponding through hole with an elastic disc spring washer.

8. The hanging device according to claim 7, characterized in that: A washer fitted on the hanging pin is installed between the shaft end screw and the rear hanging step and the rear end face of the hanging pin.

9. The hanging device according to claim 7, characterized in that: The upper part of the front body is a curved shape that protrudes forward.

10. A brake caliper unit, comprising a pair of brake levers respectively hinged to both sides of a caliper body in the middle, wherein one end of each brake lever is fitted with a brake pad via a brake pad bracket; the caliper body is suspended on a vehicle bogie via a suspension device, characterized in that: The suspension device consists of a front suspension and a rear suspension that are separate from each other, as well as a suspension pin. The front hanger has a vertically T-shaped front main body; the lower part of the front main body has a horizontal front mounting hole, and the upper two ends have vertical front hanging holes respectively; the rear part of the front mounting hole extends out a positioning rod with an anti-sway constraint plane on its upper surface. The rear hanger has a vertically T-shaped rear main body; the lower part of the rear main body has a horizontal rear mounting hole, and the upper two ends have vertical rear hanging holes respectively. The front end of the hanging pin is tightly fitted with the front mounting hole, and the rear end is elastically and tightly connected with the rear mounting hole. The outer diameter between the two ends matches the inner diameter of the mounting hole of the clamp body. The clamp body is equipped with a braking drive mechanism, and the other end of the brake lever is equipped with a relief clearance adjustment mechanism; The front end of the hanging pin is a reduced-diameter section that fits tightly with the front mounting hole, and the rear end is a tapered section that can be elastically fitted with the rear mounting hole.

11. The brake caliper unit according to claim 10, characterized in that: The taper of the tapered section is 1°-4°.

12. The hanging device according to claim 11, characterized in that: The upper part of the front body is a curved shape that protrudes forward.

13. The hanging device according to claim 12, characterized in that: The elastic wedge connection is formed by screwing a shaft end screw into the axial threaded hole on the end face of the hanging pin shaft and pressing the end face of the corresponding through hole with an elastic disc spring washer.

14. The method for suspending and connecting the brake caliper unit according to claim 13, characterized in that... Includes the following steps: Step 1: Press the front mounting hole of the front hanger into the front end of the hanger pin to make it a whole; The second step is to pass the hanging pin with the front suspension through the horizontal mounting hole on the clamp body from front to back until it is axially limited. The third step is to use the pressure plate, which is fastened to the clamp body, to press the anti-sway constraint plane of the positioning rod onto the clamp body of the brake clamp unit. Step 4: Fit the rear hanger onto the rear end of the hanger pin and secure it with the connector for a flexible fit. Step 5: Using fasteners that pass through the front mounting holes of the front main body and the rear mounting holes of the rear main body from bottom to top, the brake caliper unit is hoisted onto the vehicle bogie.

15. The method for suspending and connecting the brake caliper unit according to claim 14, characterized in that: The elastic wedge connection is formed by screwing a shaft end screw into the axial threaded hole on the end face of the hanging pin and pressing the end face of the corresponding through hole with an elastic disc spring washer; the fourth step is to put the rear hanger sleeve on the rear tapered section of the hanging pin and press the rear end face of the rear through hole with the help of the shaft end bolt and the elastic disc spring washer, thus forming an elastic wedge connection structure.

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