Shock-resistant universal joint fork

Abstract

The shock-resistant universal joint fork comprises a joint fork part, a connecting rod part fixedly arranged at the rear end of the joint fork part, the front end of a transmission shaft is connected with the rear end of the connecting rod part, the rear end of the connecting rod part extends forwards to be provided with a connecting hole, the vertical section of the connecting hole is polygonal, and a sliding polygonal block is arranged in the connecting hole in a matched mode. The front end of the transmission shaft is inserted into the connecting hole and fixedly connected with the polygonal block, a first spring is arranged between the front end of the polygonal block and the front end of the connecting hole, the rear end of the connecting rod part is detachably provided with an end plate covering the connecting hole, the end plate is provided with a sliding hole for the transmission shaft to penetrate through, the sliding hole is matched with the transmission shaft, and the transmission shaft is sleeved with a second spring. The front end of the second spring is fixed to the transmission shaft, the rear end of the second spring abuts against the front end of the end plate, a first blocking plate is fixedly arranged on the transmission shaft, a corrugated telescopic sleeve arranged on the transmission shaft in a sleeving mode is arranged between the first blocking plate and the end plate in a sealed mode, corrosion of the first spring and the second spring in the connecting hole is relieved, and blocking in the connecting hole is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of universal joint forks, and particularly relates to an earthquake-resistant universal joint fork. Background Art

[0002] The automobile steering system is a key system for controlling the driving direction of a vehicle and belongs to the safety parts among automobile components. Among them, the universal joint fork is a key component connecting the steering wheel rotating shaft and the steering gear, which plays the role of transmitting torque and rotational speed and continuously bears the alternating load of forward and reverse rotation during operation. In actual use, additional dynamic loads will be generated at the cross connection of the universal joint fork during transmission, causing impact, vibration and noise, and the transmission smoothness is relatively low.

[0003] To solve the above problems, the prior art patent "An anti-vibration universal joint fork" with the patent number "CN217177202U" discloses: including a joint fork and its shaft hole, and a transmission shaft. The transmission shaft is elastically connected to the joint fork. An installation hole is provided at the end of the joint fork away from the shaft hole. The installation hole is a counterbore. A transmission block is provided at the end of the transmission shaft and inserted into the installation hole. A first buffer component and a second buffer component are respectively provided at the front and rear ends of the transmission block. Both the first buffer component and the second buffer component are located in the installation hole. An anti-disengagement ring is sleeved on the transmission shaft, and the anti-disengagement ring is fixed on the end face of the joint fork away from the shaft hole. In this anti-vibration universal joint fork, a rectangular transmission block and an installation hole are provided between the transmission shaft and the joint fork to realize the synchronous rotation of the transmission shaft and the joint fork. With the buffer components on both sides of the transmission block, it has the characteristics of simple and novel structure, low manufacturing cost, convenient installation, anti-impact, buffer and vibration absorption, and high transmission smoothness.

[0004] However, in the above patent, since the transmission shaft slides back and forth through the anti-disengagement ring, and the universal joint fork is arranged at the bottom of the vehicle, the muddy water splashed during the vehicle driving adheres to the transmission shaft, and with the back-and-forth sliding of the transmission shaft and the anti-disengagement ring, the muddy water is brought into the installation hole, thus accumulating in the installation hole, which is likely to cause corrosion of the first buffer component and the second buffer component in the installation hole, and cause blockage in the installation hole. Summary of the Utility Model

[0005] In order to solve the above deficiencies in the prior art, the utility model proposes an earthquake-resistant universal joint fork.

[0006] In order to achieve the above technical effects, the utility model adopts the following scheme:

[0007] An earthquake-resistant universal joint fork, comprising a fork part, a connecting rod part and a transmission shaft. The connecting rod part is fixedly arranged at the rear end of the fork part. The front end of the transmission shaft is connected to the rear end of the connecting rod part. A connecting hole is formed by extending forward at the rear end of the connecting rod part. The vertical section of the connecting hole is polygonal. A sliding polygonal block is arranged in the connecting hole in a matching manner. The front end of the transmission shaft is inserted into the connecting hole and fixedly connected to the polygonal block. A first spring is connected between the front end of the polygonal block and the front end of the connecting hole. The rear end of the connecting rod part is detachably provided with an end plate covering the connecting hole through a bolt. A sliding hole for the transmission shaft to pass through is formed on the end plate. The sliding hole matches the transmission shaft. A second spring is sleeved on the transmission shaft. The front end of the second spring is fixed on the transmission shaft. The rear end of the second spring abuts against the front end of the end plate. A first baffle is fixedly arranged on the transmission shaft. A corrugated expansion sleeve sleeved on the transmission shaft is hermetically arranged between the first baffle and the end plate.

[0008] In a preferred technical solution, a sealing gasket is arranged between the end plate and the connecting rod part, and the sealing gasket is arranged around the connecting hole.

[0009] In a preferred technical solution, the number of the sealing gaskets is at least two circles, and at least two circles of sealing gaskets are sleeved in sequence from the inside to the outside.

[0010] In a preferred technical solution, the polygonal block is a piston structure matching the connecting hole, and a sealed air cavity is formed in front of the piston structure. An air inlet communicating with the air cavity is arranged on the outer wall of the connecting rod part, and a one-way valve with a direction facing the air cavity is arranged on the air inlet.

[0011] In a preferred technical solution, a plurality of triangular strengthening structures are fixedly arranged at the connection part between the transmission shaft and the polygonal block, and the plurality of triangular strengthening structures are evenly distributed around the transmission shaft.

[0012] Compared with the prior art, the beneficial effects are as follows:

[0013] The utility model has a simple structure and is convenient to use. A corrugated telescopic rod is hermetically arranged between the end plate and the first resisting edge to protect the part of the transmission shaft that can slide through the end plate, avoiding splashed muddy water from adhering to the part protected by the corrugated expansion sleeve. Therefore, muddy water can be prevented from entering the connecting hole during the sliding process of the transmission shaft and the end plate, keeping the inside of the connecting hole clean, slowing down the corrosion of the first spring and the second spring in the connecting hole, and avoiding blockage in the connecting hole. Description of the Drawings

[0014] Figure 1 It is a schematic cross-sectional view of the utility model.

[0015] Reference numerals: 1, joint fork part; 2, connecting rod part; 3, transmission shaft; 4, connecting hole; 5, polygonal block; 6, end plate; 7, first baffle plate; 8, corrugated expansion sleeve; 9, sliding hole; 10, sealing washer; 11, first spring; 12, second spring; 13, triangular reinforcement structure; 14, inflation port. Detailed implementation manners

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0017] An anti-seismic universal joint fork includes a joint fork part 1, a connecting rod part 2 and a transmission shaft 3. The joint fork part 1, the connecting rod part 2 and the transmission shaft 3 are all prior arts. The joint fork part 1 is the part for cross connection and universal rotation. The connecting rod part 2 is fixedly arranged at the rear end of the joint fork part 1, and the front end of the transmission shaft 3 is connected to the rear end of the connecting rod part 2;

[0018] A connecting hole 4 is opened at the rear end of the connecting rod part 2 and extends forward. The vertical cross-section of the connecting hole 4 is polygonal, specifically polygons such as triangles, quadrilaterals, pentagons and hexagons. A sliding polygonal block 5 is matched and arranged in the connecting hole 4. The front end of the transmission shaft 3 is inserted into the connecting hole 4 and fixedly connected to the polygonal block 5. More preferably, the front end of the transmission shaft 3 is integrally formed with the polygonal block 5 to strengthen the structural strength of the connection between the transmission shaft 3 and the polygonal block 5;

[0019] The front end of the polygonal block 5 is connected to the front end of the connecting hole 4 through a first spring 11. When the polygonal block 5 slides forward in the connecting hole 4, the first spring 11 is compressed. The rear end of the connecting rod part 2 is detachably provided with an end plate 6 covering the connecting hole 4 through bolts. A sliding hole 9 for the transmission shaft 3 to pass through is opened on the end plate 6. The sliding hole 9 is matched with the transmission shaft 3. The size of the sliding hole 9 is smaller than the size of the polygonal block 5. A second spring 12 is sleeved on the transmission shaft 3. The front end of the second spring 12 is fixed on the transmission shaft 3. A second baffle plate is fixedly arranged on the transmission shaft 3. The front end of the second spring 12 is connected to the second baffle plate. The rear end of the second spring 12 abuts against the front end of the end plate 6. When the polygonal block 5 slides backward in the connecting hole 4, the second spring 12 is compressed;

[0020] A first baffle plate 7 is fixedly arranged on the transmission shaft 3, and a corrugated expansion sleeve 8 sleeved on the transmission shaft 3 is hermetically arranged between the first baffle plate 7 and the end plate 6.

[0021] The drive shaft 3 drives the connecting rod part 2 and the joint fork part 1 to rotate through the polygonal block 5, thereby transmitting torque. The polygonal block 5 drives the drive shaft 3 to slide back and forth in the connecting hole 4 to compress the first spring 11 and the second spring 12, thereby realizing the earthquake resistance function.

[0022] A corrugated telescopic rod is hermetically arranged between the end plate 6 and the first resistance edge to protect the part of the drive shaft 3 that can slide through the end plate 6, and prevent the splashed muddy water from adhering to the part protected by the corrugated telescopic sleeve 8. Thus, during the sliding process of the drive shaft 3 and the end plate 6, muddy water can be prevented from entering the connecting hole 4, so that the inside of the connecting hole 4 can be kept clean, the corrosion of the first spring 11 and the second spring 12 in the connecting hole 4 can be slowed down, and the blockage of the connecting hole 4 can be avoided.

[0023] In a preferred technical solution, a sealing washer 10 is provided between the end plate 6 and the connecting rod part 2, and the sealing washer 10 is arranged around the connecting hole 4.

[0024] The gap between the end plate 6 and the connecting rod part 2 is sealed by the sealing washer 10 to further prevent muddy water from entering the connecting hole 4.

[0025] In a preferred technical solution, the number of the sealing washers 10 is at least two circles, and at least two circles of sealing washers 10 are sleeved in sequence from the inside to the outside.

[0026] The sealing performance between the end plate 6 and the connecting rod part 2 is enhanced by arranging a plurality of sealing washers 10.

[0027] In a preferred technical solution, the polygonal block 5 is a piston structure matching the connecting hole 4, and a sealed air cavity is formed in front of the piston structure. The area between the front end of the polygonal block 5 and the front end of the connecting hole 4 in the connecting hole 4 is the air cavity. The first spring 11 is located in the air cavity. An air inlet 14 communicating with the air cavity is provided on the outer wall of the connecting rod part 2, and a one-way valve with a direction facing the air cavity is provided at the air inlet 14. The one-way valve only allows gas to enter the air cavity.

[0028] An external air pump is used to inflate the air cavity through the air inlet 14 to form an air cavity with a certain air pressure, thereby performing auxiliary earthquake resistance through air shock absorption and improving the earthquake resistance performance.

[0029] In a preferred technical solution, a number of triangular strengthening structures 13 are fixedly provided at the connection between the drive shaft 3 and the polygonal block 5, and a number of triangular strengthening structures 13 are evenly distributed around the drive shaft 3.

[0030] The structural strength of the connection between the drive shaft 3 and the polygonal block 5 is enhanced by the triangular strengthening structure 13.

[0031] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0032] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0033] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

Claims

1. A seismic resistant universal joint fork, characterized in that: The invention comprises a yoke portion (1), a connecting rod portion (2) and a transmission shaft (3), wherein the connecting rod portion (2) is fixedly arranged at the rear end of the yoke portion (1), the front end of the transmission shaft (3) is connected to the rear end of the connecting rod portion (2), the rear end of the connecting rod portion (2) extends forward to form a connecting hole (4), the vertical cross section of the connecting hole (4) is polygonal, a sliding polygonal block (5) is matched in the connecting hole (4), the front end of the transmission shaft (3) is inserted into the connecting hole (4) and fixedly connected to the polygonal block (5), the front end of the polygonal block (5) is connected to the front end of the connecting hole (4) by a first spring (11), and the connecting hole (4) is provided with a plurality of connecting holes (4) and a plurality of connecting holes (4) connected to each other. The rear end of the rod (2) is detachably provided with an end plate (6) covering the connection hole (4) by means of bolts, the end plate (6) is provided with a sliding hole (9) for the transmission shaft (3) to pass through, the sliding hole (9) matches the transmission shaft (3), a second spring (12) is sleeved on the transmission shaft (3), the front end of the second spring (12) is fixed on the transmission shaft (3), the rear end of the second spring (12) abuts against the front end of the end plate (6), a first stop plate (7) is fixed on the transmission shaft (3), and a corrugated telescopic sleeve (8) sleeved on the transmission shaft (3) is sealed between the first stop plate (7) and the end plate (6).

2. The anti-vibration universal joint fork according to claim 1, characterized in that: A sealing gasket (10) is provided between the end plate (6) and the connecting rod portion (2), and the sealing gasket (10) is arranged around the connecting hole (4).

3. The anti-vibration universal joint fork according to claim 2, characterized in that: The number of the sealing gaskets (10) is at least two circles, and the at least two circles of sealing gaskets (10) are sequentially sleeved from the inside to the outside.

4. The anti-vibration universal joint fork according to claim 1, characterized in that: The polygonal block (5) is a piston structure matching the connecting hole (4), and a sealed air cavity is formed in front of the piston structure. An air filling port (14) communicating with the air cavity is provided on the outer wall of the connecting rod portion (2), and the air filling port (14) is provided with a one-way valve facing the air cavity.

5. The anti-vibration universal joint fork according to claim 1, characterized in that: A plurality of triangular reinforcement structures (13) are fixedly provided at the connection between the transmission shaft (3) and the polygonal block (5), and the plurality of triangular reinforcement structures (13) are evenly distributed around the transmission shaft (3).

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