A joint assembly and a cardan shaft universal joint comprising the same

Abstract

The application discloses a novel joint assembly which comprises a flange fork, a cross pack assembly and a welded fork, wherein the cross pack assembly comprises a cross shaft and four shaft head units, each of the shaft head units comprises a bearing bush which is sleeved on the shaft head of the cross shaft and connected with the fork head hole of the flange fork or the welded fork in an outer circle mode, and a small gap is arranged between the bearing bush and the shaft head of the cross shaft in a radial direction. The novel joint assembly can improve the diameter specification of the cross shaft neck, greatly improve the transmission capacity, ensure the reliable lubrication of the transmission part, delay the wear of the cross shaft and the bearing bush, improve the transmission stability, prolong the service life, and further discloses a cross shaft type universal coupling comprising the joint assembly.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of design and manufacture of transmission shafts, and more particularly to a new type of cross universal shaft. BACKGROUND

[0002] The cross shaft type universal coupling is the most common type of coupling, and is widely used in mechanical transmission occasions such as metallurgy, hoisting, automobiles, transportation, mining, petroleum, ships, coal, rubber, and papermaking due to its large angle compensation capacity and load capacity.

[0003] In the existing cross shaft type universal coupling, the cross shaft and the fork head in the joint assembly are connected through a ball bearing, which has the following disadvantages: 1. The transmission capacity has limited room for improvement due to the size of the bearing inner ring; 2. The bearing is lubricated with grease, and after a period of operation, the bearing is severely worn, which causes the transmission shaft to produce abnormal noise and vibration, thereby shortening the service life of the universal coupling. SUMMARY

[0004] The present application provides a new type of joint assembly that increases the diameter of the cross shaft journal and greatly improves the transmission capacity. At the same time, it ensures reliable lubrication of the transmission parts, delays the wear of the cross shaft and the bearing bush, improves the transmission stability, and prolongs the service life. The present application also provides a cross shaft type universal coupling comprising the joint assembly.

[0005] The present application provides a new type of joint assembly that increases the diameter of the cross shaft journal and greatly improves the transmission capacity. At the same time, it ensures reliable lubrication of the transmission parts, delays the wear of the cross shaft and the bearing bush, improves the transmission stability, and prolongs the service life. The present application also provides a cross shaft type universal coupling comprising the joint assembly.

[0006] Further, the bearing bush is made of self-lubricating material.

[0007] Further, the bearing bush and the shaft head of the cross shaft are radially fitted with a small gap.

[0008] Further, the bearing bush and the fork head hole of the flange fork and the welding fork are interference fitted.

[0009] Further, the bearing bush and the fork head hole of the flange fork and the welding fork are connected by threads.

[0010] Further, each shaft head unit further comprises an oil nozzle and a sealing member; the corresponding shaft heads of the cross shaft are penetrated by oil holes, and the two oil holes perpendicular to each other intersect at the center of the cross shaft, the end of each shaft head is provided with an oil nozzle, and the sealing member is sleeved on the shaft neck and matched with the stepped hole on the inner end surface of the bearing bush.

[0011] Further, the joint assembly further comprises two left and right accumulator components, each of which comprises a shell, an air nozzle and a diaphragm; the left and right end faces of the cross shaft are each provided with a threaded hole, the shell is connected with the threaded hole through threading, the air nozzle is arranged on the air inlet of the shell, and the center of the cross shaft is communicated with the threaded hole through two small oil holes; the inner cavity of the shell closed by the diaphragm is filled with inert gas or nitrogen, and an outer cavity is formed between the diaphragm and the oil hole.

[0012] Further, each accumulator further comprises a sealing ring arranged on the end face where the shell contacts the cross shaft.

[0013] Further, when the universal joint connected with the cross shaft is in a non-low-speed and low-torque working condition, a layer of static pressure lubricating film is formed between the bearing bush and the shaft head of the cross shaft; the bearing bush, the sealing assembly, the cross shaft and the accumulator component form a constant pressure lubricating system.

[0014] The cross shaft type universal joint comprises a middle shaft assembly, two left and right joint assemblies, each of which comprises a flange fork, a cross pack assembly and a welded fork; the cross pack assembly is connected with the fork head hole of the flange fork or the welded fork; and the two left and right welded forks are welded with the middle shaft assembly to form a whole.

[0015] The joint assembly and the cross shaft type universal joint have the following advantages: 1. The cross shaft and the flange fork / welded fork are connected through the bearing bush, compared with bearing connection, under the premise that the diameter of the fork head hole of the flange fork / welded fork is unchanged, the diameter specification of the cross shaft neck is increased by about 21%, so that the transmission torque is increased by about 50%, and the transmission capacity of the cross shaft and the universal joint is greatly improved; 2. The transmission of the bearing bush and the cross shaft reduces the transmission vibration and noise, delays the wear of the cross shaft and the bearing bush, ensures the transmission stability of the joint, reduces the noise pollution in the transmission process, and prolongs the service life of the joint; 3. The lubrication mode between the bearing bush and the cross shaft can be selected according to the different transmission load and speed of the joint: 1. In the low-speed and low-torque working condition, only the bearing bush needs to be made of self-lubricating material, and no additional lubrication is needed in the joint, thereby reducing the maintenance cost of the transmission shaft; 2. In the non-low-speed and low-torque working condition, the bearing bush, the sealing assembly, the cross shaft and the accumulator form a constant pressure lubricating system, and the small gap cooperation forms a layer of static pressure lubricating film between the bearing bush and the shaft head of the cross shaft; at the same time, the accumulator component can timely and effectively ensure the pressure of the lubricating oil circuit and maintain the stability of the static pressure lubricating film; the static pressure lubricating system can effectively improve the transmission stability of the cross shaft, delay the wear of the cross shaft and the bearing bush, reduce the noise pollution in the transmission process, and prolong the service life of the joint. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of a novel joint assembly.

[0017] Figure 2 is a structural schematic view of the cross pack assembly.

[0018] Figure 3 is a sectional view along line A-A in Figure 2 Figure 1.

[0019] Figure 4 is a structural schematic view of a cross shaft type universal coupling according to the present application. DETAILED DESCRIPTION

[0020] The present application will be further described in detail below in conjunction with the accompanying drawings and specific examples. Example 1

[0021] From Figure 1 , Figure 2 , Figure 3 it can be seen that the present application is a new type of joint assembly, which comprises a flange fork 1, a cross pack assembly 2, and a welded fork 3, the cross pack assembly 2 comprises a cross shaft 24 and four shaft head units, each shaft head unit comprises a bearing bush 22, the bearing bush 22 is sleeved on the shaft head of the cross shaft 24, and the outer circle is connected with the fork head hole of the flange fork 1 or the welded fork 3.

[0022] The joint assembly has the following advantages: 1. The cross shaft and the flange fork / welded fork are connected by the bearing bush, compared with the bearing connection, under the premise that the diameter of the fork head hole of the flange fork / welded fork is unchanged, the diameter specification of the cross shaft neck is increased by about 21%, so that the transmission torque is increased by about 50%, and the transmission capacity is greatly improved; 2. The transmission vibration is reduced, the noise in the transmission process is reduced, the stability of the cross shaft transmission is ensured, the wear of the cross shaft and the bearing bush is delayed, and the service life of the joint assembly is prolonged.

[0023] Example 2

[0024] From Figure 1 , Figure 2 , Figure 3 it can be seen that the present application is a new type of joint assembly: the bearing bush 22 is made of self-lubricating material.

[0025] When the cross shaft connected coupling is in the working condition of low speed and low torque, the bearing bush 22 is made of self-lubricating material, and any additional lubrication is not required in the joint assembly, thereby reducing the maintenance cost of the cross shaft.

[0026] Example 3

[0027] From Figure 1 , Figure 2 , Figure 3 it can be seen that the present application is a new type of joint assembly: the bearing bush 22 and the shaft head of the cross shaft 24 are in a small gap fit in the radial direction.

[0028] The bearing bush 22 and the shaft head of the cross shaft 24 are fitted with a small clearance, which effectively improves the stability of the cross shaft transmission, reduces the wear of the cross shaft and the bearing bush, and extends the service life of the joint assembly.

[0029] Example 4

[0030] from Figure 1 , Figure 2 , Figure 3 It is understood that the present invention provides a novel joint assembly in which the bearing bush 22 is interference-fitted with the fork head holes of the flange fork 1 and the welded fork 3.

[0031] The bearing bush 22 is interference-fitted with the flange fork 1 and the welded fork 3, ensuring its reliable positioning with the flange fork 1 and the welded fork 3 and preventing it from moving.

[0032] Example 5

[0033] from Figure 1 , Figure 2 , Figure 3 It is understood that the present invention provides a novel joint assembly: the bearing bush 22 is connected to the fork head holes of the flange fork 1 and the welded fork 3 by means of threads.

[0034] The bearing bush 22 is connected to the flange fork 1 and the welded fork 3 by threads. While ensuring reliable positioning of the bearing bush with the flange fork 1 and the welded fork 3, it can effectively solve the problems of bearing bush deformation caused by interference fit installation, crushing damage to the mating surface caused by press fitting, and inconvenience in maintenance of the flange fork / welded fork.

[0035] Example 6

[0036] from Figure 1 , Figure 2 , Figure 3 As can be seen, the present invention provides a novel joint assembly: each shaft head unit further includes an oil nozzle 21 and a seal 23; an oil hole 241 is passed through between corresponding shaft heads of the cross shaft 24, two mutually perpendicular oil holes 241 intersect at the center of the cross shaft 24, an oil nozzle 21 is installed at the end of each shaft head, and the seal assembly 23 is sleeved on the journal and mates with the stepped hole on the inner end face of the bearing bush 22.

[0037] When the universal joint with the cross shaft connection is in a non-low speed, low torque operating condition: Figure 2 , Figure 3 In the diagram, the red line represents lubricating oil and the arrow indicates the direction of flow. Lubricating medium (including grease and lubricating oil) is injected from any of the oil nozzles 21. The lubricating medium reaches the four shaft heads along the oil holes 241, and through the gap between the end face of the cross shaft 24 shaft head and the bearing bush 22, it reaches the gap between the outer circle of the cross shaft 24 shaft head and the inner hole of the bearing bush 22 to lubricate the shaft heads. The sealing assembly 23 seals the lubricating medium to prevent it from flowing out from the journal of the cross shaft.

[0038] Example 7

[0039] From Figure 1 , Figure 2 , Figure 3 It can be known that the joint assembly is a new type: the joint assembly further comprises two left and right energy accumulator components 25, each of which comprises a shell 251, an air nozzle 252 and a diaphragm 253; each of the left and right end faces of the cross shaft 24 is provided with a screw hole 242, the shell 251 is connected with the screw hole 242 through screw threads, the air nozzle 252 is arranged on the air inlet of the shell 251, and the center of the cross shaft 24 is in communication with the screw hole 242 through two small oil holes 243; the inner cavity closed by the shell 251 and the diaphragm 253 is filled with inert gas or nitrogen, and an outer cavity is formed between the diaphragm 253 and the oil hole 243.

[0040] When the universal joint connected with the cross shaft is in a non-low-speed and low-torque working condition, the bearing bush 22, the sealing assembly 23, the cross shaft 24 and the energy accumulator component 25 form a constant-pressure lubrication system: in Figure 2 , Figure 3 , the red lines represent lubricating oil, and the arrows represent the direction of flow; after the lubricating oil enters from the oil nozzle 21, most of the lubricating oil can reach the small gap between the four shaft heads and the four bearing bushes through the cross oil hole for lubrication, and the small gap cooperates to form a layer of static pressure lubrication film between the bearing bush 22 and the shaft head of the cross shaft 24; at the same time, a small part of the lubricating oil reaches the outer cavity through the small oil hole 243 and extrudes the diaphragm 253, so that the inner and outer pressures reach balance under the action of the gas in the inner cavity; thus, when the lubricating oil is lost and leaked, the pressure of the lubricating oil circuit can be effectively ensured in time through the energy accumulator component 25, and the stability of the static pressure lubrication film is maintained. Therefore, the static pressure lubrication system can effectively improve the transmission stability of the cross shaft, delay the wear of the cross shaft and the bearing bush, reduce noise pollution in the transmission process, and prolong the service life of the joint assembly.

[0041] Example 8

[0042] From Figure 1 , Figure 2 , Figure 3 It can be known that the joint assembly is a new type: each energy accumulator 25 further comprises a sealing ring 254, which is arranged on the end face where the shell 251 contacts the cross shaft 24.

[0043] The sealing ring 252 can effectively prevent the lubricating oil from seeping out of the screw hole 242 where the energy accumulator 25 and the cross shaft 24 are connected.

[0044] Example 9

[0045] From Figure 1 , Figure 2 , Figure 3 ,Figure 4 It can be known that the cross shaft type universal coupling comprises a middle shaft assembly 4, left and right joint assemblies, each joint assembly comprises a flange fork 1, a cross pack assembly 2 and a welded fork 3, the cross pack assembly 2 is connected with the fork hole of the flange fork 1 or the welded fork 3, and the left and right welded forks 3 are welded with the middle shaft assembly 4 to form a whole.

[0046] The joint assembly and the cross shaft type universal coupling have the following advantages: 1. The cross shaft and the flange fork / welded fork are connected by a bearing bush, compared with bearing connection, under the premise that the diameter of the fork hole of the flange fork / welded fork is unchanged, the diameter specification of the cross shaft neck is increased by about 21%, so that the transmission torque is increased by about 50%, and the transmission capacity of the cross shaft and the universal coupling is greatly improved; 2. The transmission of the bearing bush and the cross shaft reduces transmission vibration and noise, delays the wear of the cross shaft and the bearing bush, ensures the transmission stability of the coupling, reduces noise pollution in the transmission process, and prolongs the service life of the coupling; 3. The lubrication mode between the bearing bush and the cross shaft can be selected according to different transmission loads and speeds of the coupling: 1. In the low-speed and low-torque working condition, only the bearing bush 22 needs to be ensured to be a self-lubricating material, and no additional lubrication is needed in the joint, which reduces the maintenance cost of the transmission shaft; 2. In the non-low-speed and non-low-torque working condition, the bearing bush 22, the sealing assembly 23, the cross shaft 24 and the accumulator 25 form a constant-pressure lubrication system, and the small gap cooperation forms a layer of static pressure lubrication film between the bearing bush 22 and the shaft head of the cross shaft 24; at the same time, the accumulator component 25 can timely and effectively ensure the pressure of the lubricating oil way and maintain the stability of the static pressure lubrication film; the static pressure lubrication system can effectively improve the transmission stability of the cross shaft, delay the wear of the cross shaft and the bearing bush, reduce noise pollution in the transmission process, and prolong the service life of the coupling.

[0047] In summary, the joint assembly and the cross shaft type universal coupling greatly improve the transmission capacity, ensure the reliable lubrication of the transmission part, delay the wear of the cross shaft and the bearing bush, improve the transmission stability of the coupling, and prolong the service life of the coupling.

[0048] The above description of the present application and its embodiments is illustrative and not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it, without departing from the purpose of the present application, similar structural modes and embodiments can be designed without creativity, which should belong to the protection scope of the present application.

Claims

1. A knuckle assembly comprising a flange fork (1), a cross pack assembly (2), a weld fork (3), characterized in that the cross pack assembly (2) is connected to the flange fork (1) by means of a cross pin (4) and the weld fork (3) is connected to the cross pack assembly (2) by means of a weld pin (5). The package assembly (2) comprises a cross shaft (24), four shaft head units, each shaft head unit comprises a bearing bush (22), the bearing bush (22) is sleeved on the shaft head of the cross shaft (24), and the outer circle is connected with the fork head hole of the flange fork (1) or the welding fork (3); the joint assembly further comprises left and right two accumulator components (25), each accumulator component (25) comprises a shell (251), an air nozzle (252) and a diaphragm (253); the left and right end faces of the cross shaft (24) are each provided with a threaded hole (242), the shell (251) is connected with the threaded hole (242) through screw threads, the air nozzle (252) is arranged on the air inlet of the shell (251), and the center of the cross shaft (24) is communicated with the threaded hole (242) through left and right two small oil holes (243); the inner cavity closed by the shell (251) and the diaphragm (253) is filled with inert gas or nitrogen, and an outer cavity is formed between the diaphragm (253) and the small oil hole (243).

2. The joint assembly of claim 1, wherein: The bearing bush (22) is made of self-lubricating material.

3. The joint assembly of claim 1, wherein: The bearing bush (22) is in small gap fit with the shaft head of the cross shaft (24) in the radial direction.

4. The joint assembly of claim 1, wherein: The bearing bush (22) is in interference fit with the fork head hole of the flange fork (1) and the welding fork (3).

5. The joint assembly of claim 1, wherein: The bearing bush (22) is connected with the fork head hole of the flange fork (1) and the welding fork (3) through threads.

6. The joint assembly of claim 1, wherein: Each shaft head unit further comprises an oil nozzle (21) and a sealing element (23); the cross shaft (24) is provided with an oil hole (241) penetrating between the corresponding shaft heads, the two oil holes (241) perpendicular to each other intersect at the center of the cross shaft (24), the end of each shaft head is provided with the oil nozzle (21), and the sealing element (23) is sleeved on the shaft neck and matched with the stepped hole on the inner end face of the bearing bush (22).

7. The joint assembly of claim 1, wherein: Each accumulator component (25) further comprises a sealing ring (254), which is arranged on the end face of the shell (251) in contact with the cross shaft (24).

8. The joint assembly of claim 6, wherein: When the cross shaft connected universal coupling is in the working condition of low speed and low torque, a layer of static pressure lubricating film is formed between the bearing bush (22) and the shaft head of the cross shaft (24); the bearing bush (22), the sealing element (23), the cross shaft (24) and the accumulator component (25) form a constant pressure lubricating system.

9. A cardan shaft type universal joint characterized by: It comprises a middle shaft assembly (4), left and right two joint assemblies as claimed in any one of claims 1-8, each joint assembly comprising a flange fork (1), a cross package assembly (2) and a welding fork (3); the cross package assembly (2) is connected with the fork head hole of the flange fork (1) or the welding fork (3); the left and right two welding forks (3) are welded with the middle shaft assembly (4) to form a whole.

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