Needle-roller-free high-bearing-capacity universal joint assembly

Abstract

The invention relates to the technical field of universal joints, in particular to a needle-roller-free high-bearing universal joint assembly which comprises a starlike sleeve, a retainer, a simple shell and a steel ball, a ball groove part is arranged on the bottom surface of the retainer, a first connecting ball is arranged on the inner side of the ball groove part, and an outer sleeve rod is mounted on the bottom surface of the first connecting ball. According to the invention, through a targeted oil supplementing mechanism, the extrusion part is triggered by utilizing structural deviation during the beating action, lubricating grease is accurately conveyed to the steel ball, the lubricating requirement caused by the increase of the contact stress of the steel ball and the raceway under the extreme working condition is effectively met, the wear resistance is obviously improved, and the service life is obviously prolonged; through cooperation of the main oil cavity and the auxiliary oil cavity and the ingenious structure of the arc pressing piece and the sliding block, automatic supplement and balance of lubricating grease are achieved, it is guaranteed that lubrication is sufficient after each action, abrasion and the frequency of manual oiling are reduced, and maintenance convenience and overall operation efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of universal joints, in particular to a high-load universal joint assembly without a rolling needle. Background Art

[0002] Universal joints are mechanical devices that can achieve torque and rotation transmission when the angle between two shafts remains unchanged or changes. They are often used in various transportation vehicles such as automobile transmission systems, ships, and airplanes. The small diameter of the needle roller universal joint results in only linear contact with the shaft neck or the inner wall of the outer sleeve. This contact method results in a large load per unit area, which accelerates the wear of the components and shortens the service life of the universal joint. In order to solve these problems, the needle roller-free universal joint came into being. This universal joint abandons the traditional needle roller structure and instead adopts new structures such as wear-resistant layers and wear-resistant sleeves to increase the contact surface and achieve load dispersion.

[0003] In order to overcome the limitations of needle roller universal joints, the ball cage universal joint (constant velocity joint) as an important component in the transmission system of modern automobiles adopts a more advanced design. It realizes constant velocity transmission through the internal spherical raceway and balls to ensure the smooth transmission of power from the engine to the wheels. It is widely used in the half shafts of front-wheel drive vehicles and the drive shafts of four-wheel drive vehicles. The ball cage universal joint is mainly composed of the inner raceway of the star sleeve, the outer raceway of the spherical shell, the steel ball, the cage cage, the dustproof rubber sleeve and other components. The steel ball is installed in the raceway formed by the star sleeve and the spherical shell, and is fixed on the same horizontal plane by the cage. The ball cage universal joint is regularly filled with special grease and protected by a dustproof rubber sleeve to prevent dust and moisture from intruding, thereby maintaining its internal good lubrication state. However, the maintenance frequency of the ball cage universal joint used in the excavator is higher than that of other vehicles to maintain the lubrication demand. When maintenance is required, first use tools to remove the clips at the edge of the rubber sleeve, and create a gap large enough between the rubber sleeve and the shaft body to insert the oil pipe. The oil pipe is connected to an oil cylinder, and the oil cylinder is filled with special grease for the ball cage universal joint. Press the oil cylinder and add the grease into the ball cage universal joint. When the grease begins to overflow from the gap, it means that the inside of the ball cage universal joint is already full of grease. At this time, stop adding grease and use a new small clip of the rubber sleeve to re-seal the head end of the rubber sleeve with the shaft body.

[0004] Excavators usually work in harsh environments such as dust, mud, and humidity. In order to adapt to complex terrain and operating requirements, the steering angle is too large when traveling, and the direction is frequently turned to the dead end. During this process, the ball cage universal joint needs to bear a large torque and load, the friction between the components is large, the wear rate is fast, and the grease consumption rate is fast. When the direction is turned to the dead end, the contact point between the steel ball and the raceway in the corresponding direction will move to the extreme position of the raceway, such as the top. The radius of curvature at these positions is small, causing the contact area between the steel ball and the raceway to become more limited, and the contact stress between the steel ball and the raceway becomes larger, thereby increasing the lubrication demand of the steel ball at this position. If the lubrication is insufficient, the friction between the steel ball and the raceway will increase, the bearing capacity will decrease, and the frequent relative movement will cause the wear between the steel ball and the raceway to increase. This is also one of the reasons why the maintenance frequency of the ball cage universal joint used in the excavator is high. However, when adding grease, it is necessary to open a large enough gap at one end of the rubber sleeve, so that dust, moisture and other impurities can easily enter the interior of the ball cage universal joint, causing grease contamination, and this process can easily directly damage the edge of the rubber sleeve. Due to the high maintenance frequency, the rubber sleeve will repeat the above operation many times, which may easily lead to a decrease in the sealing performance of the rubber sleeve after it is damaged, and then cause problems such as grease leakage and impurity intrusion.

[0005] Therefore, a high-load-bearing universal joint assembly without a needle roller is proposed. Summary of the invention

[0006] The object of the present invention is to provide a high-load-bearing universal joint assembly without a needle roller. In order to solve the problem that the ball cage universal joint of an excavator wears quickly due to the harsh working environment and frequent operation, and the rubber sleeve is easily damaged and the grease is contaminated during the lubrication and maintenance process, the ball cage universal joint is effectively lubricated and the rubber sleeve is prevented from being damaged due to improper lubrication by automatically replenishing a small amount of oil to the steel ball in the extreme position when the action is stopped and automatically replenishing the stored amount of grease after the action is completed.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A high-load universal joint assembly without a needle roller, comprising a star-shaped sleeve, a cage, a simple shell and a steel ball, wherein a ball groove is provided on the bottom surface of the cage, a connecting ball 1 is provided on the inner side of the ball groove, an outer sleeve rod is installed on the bottom surface of the connecting ball 1, an inner slide rod is provided on the inner side of the outer sleeve rod, a connecting ball 2 is installed on one end of the inner slide rod, a main oil chamber, a secondary oil chamber and a funnel notch are provided inside the simple shell, the main oil chamber and the secondary oil chamber are used to store grease, the secondary oil chamber is located on the inner side of the main oil chamber, the funnel notch is located on the inner side of the secondary oil chamber, six movable openings are provided on the upper end surface of the funnel notch, an oil guide block is installed on the inner side of the secondary oil chamber, an extrusion piece is provided on the inner side of the movable opening, and an extrusion piece is provided on the inner side of the movable opening;

[0009] The displacement of the retaining frame, connecting ball 1, connecting ball 2 and outer sleeve rod during the killing action triggers the flipping of the extrusion part, and the squeezed oil guide block is displaced in the auxiliary oil chamber. The grease is squeezed out through the interaction between the oil guide block and the auxiliary oil chamber, and the grease is transported to the steel ball in the same direction. After the killing action is completed, the main oil chamber replenishes the auxiliary oil chamber with the same amount of grease.

[0010] It can be seen from the above scheme that the existing technology will adopt the traditional needle roller type universal joint, while this scheme triggers the lubrication mechanism through the offset of components such as the retaining frame, accurately controls the delivery of grease, improves lubrication efficiency and load-bearing capacity, and at the same time reduces component wear and extends service life. The structure is more compact and simple, reducing manufacturing costs and maintenance difficulties.

[0011] Preferably, an extrusion ball is provided at one end of the extrusion piece, and a second magnetic block is provided at the other end of the extrusion piece.

[0012] From the above scheme, it can be seen that the existing technology will use the traditional universal joint using needle rollers and fixed lubrication system. However, this scheme achieves more precise control of grease by adding a squeeze ball and a second magnetic block, and uses the magnetic force of the second magnetic block to assist the squeeze ball in squeezing out the grease, thereby improving the flexibility and efficiency of lubrication, while reducing mechanical wear and energy loss, and extending the service life of the universal joint.

[0013] Preferably, a first magnetic block is provided at one end of the outer sleeve rod, and the first magnetic block is magnetically connected to the second magnetic block.

[0014] It can be seen from the above scheme that the existing technology uses a traditional universal joint with a mechanically connected or fixed structure outer rod and an extruded part. However, this scheme realizes a dynamic connection between the outer rod and the extruded part through the magnetic connection between the first magnetic block and the second magnetic block, improves the flexibility and response speed of the structure, reduces mechanical wear, simplifies the assembly process, and improves production efficiency and the overall performance of the universal joint.

[0015] Preferably, a side slide groove is provided on one side surface of the oil guide block, an extrusion block is installed on the other side surface of the oil guide block, a connecting block is provided inside the side slide groove, and the connecting block is fixedly connected to the side wall of the auxiliary oil chamber.

[0016] It can be seen from the above scheme that the existing technology will use a universal joint with a traditional mechanical oil guide structure. Compared with the existing technology, this scheme improves the stability and oil guide efficiency of the oil guide block through the design of the side slide groove and the extrusion block, combined with the fixed connection of the connecting block and the auxiliary oil chamber, ensures the uniform distribution of grease, reduces friction and wear between components, and thus extends the service life of the universal joint.

[0017] Preferably, a connecting spring is provided on the surface of the connecting block, and one end of the connecting spring is connected to the inner wall surface of the side sliding groove.

[0018] It can be seen from the above scheme that the existing technology will adopt the traditional oil guide block design with rigid connection or fixed structure. This scheme introduces a connection spring to provide the oil guide block with buffering and adaptive capabilities, so that it can better adapt to the working state of the universal joint, improve the stability and reliability of the oil guide, and at the same time reduce the stress and wear caused by the rigid connection, thereby extending the service life of the universal joint.

[0019] Preferably, an oil hole groove is formed through the surface of the oil guide block, an oil guide pipe is provided inside the oil hole groove, and one end of the oil guide pipe is connected to the retaining frame.

[0020] It can be seen from the above scheme that the existing technology will adopt the traditional universal joint design without directional lubrication channel. This scheme realizes the directional delivery of grease through the design of oil hole groove and oil guide pipe, ensures the accuracy and efficiency of lubrication, reduces the waste and leakage of grease, and improves the operating efficiency and stability of the universal joint, reduces maintenance costs, and prolongs the service life.

[0021] Preferably, a refueling hole and a sliding groove are provided on the wall of the main oil chamber, the main oil chamber is connected with the auxiliary oil chamber through the refueling hole, the sliding groove is located on one side of the refueling hole, and a sliding block is provided on the inner side of the sliding groove.

[0022] It can be seen from the above scheme that the existing technology will use a traditional universal joint with a single oil chamber structure. This scheme realizes the automatic replenishment and balanced distribution of grease through the connection design of the main oil chamber and the auxiliary oil chamber, combined with the sliding groove and the sliding block, improves the lubrication efficiency, reduces manual intervention, and at the same time enhances the structural compactness and reliability of the universal joint, reducing the difficulty and cost of maintenance.

[0023] Preferably, the side wall surface of the main oil chamber is provided with an arc pressure plate, one end of which is connected to the sliding block, the arc pressure plate corresponds to the position of the oil filling hole, the side surface of the sliding block is provided with an extrusion bevel, and the extrusion block is limitedly connected to the extrusion bevel.

[0024] From the above scheme, it can be seen that the existing technology will adopt the traditional oil chamber structure without automatic adjustment function. This scheme realizes the automatic adjustment and replenishment of grease through the linkage design of arc pressing plate, sliding block and extrusion chute, ensuring the continuous lubrication of the universal joint under different working conditions, improving its load-bearing capacity and service life, and reducing the frequency and difficulty of manual maintenance.

[0025] Preferably, six ball grooves are provided on the surface of the retainer, the ball grooves of the retainer match the steel balls, the inner surfaces of the ball grooves of the retainer are provided with oil outlet holes, and the oil outlet holes of the retainer are connected to the oil guide pipes.

[0026] From the above solution, it can be seen that the existing technology uses traditional lubrication methods such as regular application or soaking of the cage structure. This solution achieves accurate delivery of grease to each steel ball through the connection between the oil outlet hole on the cage and the oil guide pipe, ensuring comprehensive lubrication of the universal joint, improving its operating efficiency and durability, while simplifying the lubrication process and reducing maintenance costs.

[0027] Preferably, a fixed amount of grease is filled inside the auxiliary oil chamber.

[0028] From the above scheme, it can be seen that the existing technology will adopt the traditional universal joint design of open or irregular grease replenishment. This scheme achieves long-term stability and reliability of lubrication by pre-installing a fixed amount of grease in the auxiliary oil chamber, avoiding universal joint failure caused by insufficient or excessive lubrication, reducing maintenance frequency and cost, and at the same time increasing the service life and performance stability of the universal joint.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. A high-load universal joint assembly without a needle roller, which uses the offset of the cage and the connecting components during the deadlock action to trigger the extrusion part to flip, and then squeezes the oil guide block to move in the auxiliary oil chamber, accurately squeezes out the grease to the steel ball, and meets the lubrication needs of extreme positions. In addition, the oil filling port is moved to the outer surface of the simple shell to avoid the wear of the dustproof rubber sleeve during lubrication and maintenance, and the service life of the rubber sleeve is extended. It effectively solves the rapid wear and lubrication and maintenance problems of the excavator ball cage universal joint due to the harsh working environment and frequent operation, and improves the durability and reliability of the universal joint.

[0031] 2. A high-load universal joint assembly without needle rollers realizes automatic replenishment and balance of grease through the mutual cooperation of the main oil chamber and the auxiliary oil chamber, as well as the ingenious design of the arc-pressing plate and the sliding block. After each dead-end action, the grease in the auxiliary oil chamber is replenished in time, ensuring that the total amount of grease inside the universal joint remains relatively stable, avoiding aggravated wear caused by insufficient lubrication. At the same time, it also reduces the frequency and difficulty of manual refueling, and improves the convenience and efficiency of maintenance.

[0032] 3. A high-load universal joint assembly without a needle roller, which effectively prevents external dust and impurities from entering the universal joint through the fixing method of dustproof rubber sleeve and buckle, and protects the internal parts and grease from pollution. At the same time, one end of the dustproof rubber sleeve can be locked or welded to the surface of the shaft body by buckle, which prolongs its service life and further enhances the reliability and durability of the universal joint. It is suitable for mechanical equipment with narrow working environment and frequent killing action such as excavators, providing a strong guarantee for the long-term stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0034] Figure 2 It is a schematic cross-sectional view of the interior of the simple shell of the present invention;

[0035] Figure 3 It is a schematic diagram of the bottom structure of the simple shell of the present invention;

[0036] Figure 4 It is a schematic diagram of the overall planar structure of the present invention;

[0037] Figure 5 For the present invention Figure 4 A magnified image of point A;

[0038] Figure 6 It is a structural schematic diagram of the oil outlet hole of the present invention;

[0039] Figure 7 It is a plan view of the present invention in a killed state;

[0040] Figure 8 For the present invention Figure 7 Enlarged view of point B.

[0041] In the figure: 1. star sleeve; 2. retaining frame; 21. ball groove piece; 22. connecting ball one; 23. outer rod; 24. inner slide rod; 25. connecting ball two; 26. magnetic block one; 3. simple shell; 31. main oil chamber; 311. oil filling hole; 312. arc pressing piece; 313. sliding groove; 314. sliding block; 315. extrusion chute; 32. auxiliary oil chamber; 33. funnel notch; 34. movable opening; 35. oil guide block; 351. side slide groove; 352. oil hole groove; 353. connecting block; 354. connecting spring; 355. extrusion block; 356. oil guide pipe; 36. extrusion piece; 361. extrusion ball; 362. magnetic block two; 37. oil outlet; 4. steel ball; 5. dustproof rubber sleeve; 6. drive shaft; 7. transmission shaft; 8. buckle. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] See also Figures 1 to 8 The present invention provides a high-load universal joint assembly without a needle roller, and the technical solution is as follows:

[0044] A needle-free high-load universal joint assembly, comprising a star sleeve 1, a retainer 2, a simple shell 3, a steel ball 4, a dustproof rubber sleeve 5, a drive shaft 6, a transmission shaft 7 and a buckle 8, wherein the star sleeve 1 is arranged on the inner side of the simple shell 3, the retainer 2 is located between the star sleeve 1 and the simple shell 3, the surface of the simple shell 3 is provided with six outer raceways, the surface of the star sleeve 1 is provided with six inner raceways, the positions of the inner and outer raceways correspond, six steel balls 4 are arranged inside the six raceways, the surface of the retainer 2 is opened There are six ball grooves for accommodating steel balls 4. The center of the outer surface of the star sleeve 1 is connected to the transmission shaft 7. The center of the outer surface of the simple shell 3 is connected to the drive shaft 6. It is installed at the hub end and connected to the wheel. It is responsible for transmitting power from the transmission system to the wheel. The dustproof rubber sleeve 5 is fixedly installed on one side of the simple shell 3. The other end of the dustproof rubber sleeve 5 is fixed to the surface of the transmission shaft 7 by a buckle 8. The bottom surface of the retainer 2 is provided with a ball groove part 21, and the inner side of the ball groove part 21 is provided with a connecting ball. 22, an outer rod 23 is installed on the bottom surface of the connecting ball 1 22, an inner slide rod 24 is arranged on the inner side of the outer rod 23, and a connecting ball 25 is installed on one end of the inner slide rod 24. A main oil chamber 31, an auxiliary oil chamber 32 and a funnel notch 33 are opened inside the cylindrical shell 3. The main oil chamber 31 and the auxiliary oil chamber 32 are used to store grease. The auxiliary oil chamber 32 is located on the inner side of the main oil chamber 31, and the funnel notch 33 is located on the inner side of the auxiliary oil chamber 32. The connecting ball 25 is opposite to the funnel notch 33. Next, six movable openings 34 are formed on the upper end surface of the funnel notch 33, an oil guide block 35 is installed on the inner side of the auxiliary oil chamber 32, an extrusion piece 36 is arranged on the inner side of the movable opening 34, six partitions are fixedly installed on the inner bottom surface of the auxiliary oil chamber 32, and the partitions divide the auxiliary oil chamber 32 into six independent areas, and the inner dimensions of the areas match those of the oil guide block 35, an extrusion piece 36 is arranged on the inner side of the movable opening 34, and the extrusion piece 36 is connected to the inner side of the movable opening 34 through a spring hinge.

[0045] The displacement of the retaining frame 2, the connecting ball 22, the connecting ball 22 and the outer sleeve rod 23 in the killing action triggers the extrusion piece 36 to flip, and the squeezed oil guide block 35 is displaced in the auxiliary oil chamber 32, and the grease is squeezed out through the interaction between the oil guide block 35 and the auxiliary oil chamber 32, and the grease is transported to the steel ball 4 in the same direction. After the killing action is completed, the main oil chamber 31 replenishes the auxiliary oil chamber 32 with the same amount of grease.

[0046] In this embodiment, in the non-killing state, power is transmitted through the steel ball 4 between the star sleeve 1 and the cylindrical shell 3, the retainer 2 ensures that the steel ball 4 is in the correct position in the inner and outer raceways, and the dustproof rubber sleeve 5 and the buckle 8 ensure the cleanliness of the interior of the universal joint to prevent external impurities from entering. Once the killing action is triggered, the retainer 2 and the ball slot 21, connecting ball 1 22, outer rod 23, inner slide rod 24 and connecting ball 25 connected thereto are offset, and the extrusion piece 36 is extruded and flipped, exerting pressure on the oil guide block 35, and the oil guide block 35 is squeezed and displaced in the auxiliary oil chamber 32. Due to its close fit with the inner wall of the auxiliary oil chamber 32, the grease stored in the corresponding area of ​​the auxiliary oil chamber 32 is squeezed out. The extruded grease is transported to the steel ball 4 in the same direction through a specific channel or gap, providing additional lubrication for the steel ball 4 and the raceway. After the killing action is completed, the universal joint returns to its normal position, and the extrusion piece 36 is reset under the action of the spring hinge. At this time, the grease in the main oil chamber 31 is transported to the auxiliary oil chamber 32 through the internal channel to supplement the grease squeezed out by the locking action, ensuring that the total amount of grease in the auxiliary oil chamber 32 remains relatively stable, thereby ensuring the continuous lubrication and long life of the universal joint assembly. During the entire working process, the dustproof rubber sleeve 5 and the buckle 8 effectively prevent external dust and impurities from entering the interior of the universal joint, protecting the internal parts and grease from contamination.

[0047] As an embodiment of the present invention, refer to Figure 3 , Figure 4 and Figure 5 A squeezing ball 361 is disposed at one end of the squeezing member 36 , and a second magnetic block 362 is disposed at the other end of the squeezing member 36 .

[0048] In this embodiment, when the squeezing member 36 has not been killed, the squeezing member 36 is always in a tilted state relative to the oil guide block 35 on the inner side of the movable opening 34 through the spring hinge. When the killing action occurs, the squeezing ball 361 will flip the surface of the squeezing oil guide block 35, causing the oil guide block 35 to move inward along the auxiliary oil chamber 32.

[0049] As an embodiment of the present invention, refer to Figure 2 , Figure 3 and Figure 5 A magnetic block 26 is provided at one end of the outer sleeve rod 23, and the magnetic block 26 is magnetically connected to the magnetic block 2 362.

[0050] In this embodiment, when the killing action occurs, the connecting ball 1 22, the outer rod 23, the inner slide rod 24 and the connecting ball 2 25 are offset and swung to one side as a whole, the inner slide rod 24 slides on the inner side of the outer rod 23, the combined length of the inner slide rod 24 and the outer rod 23 is lengthened, and the magnet 1 26 gradually approaches the magnet 2 362. When the magnet 1 26 approaches the magnetic area of ​​the magnet 2 362, the magnet 2 362 will quickly magnetically dock with the magnet 1 26, driving the extrusion piece 36 to flip as a whole, and driving the extrusion ball 361 to squeeze one end face of the oil guide block 35.

[0051] As an embodiment of the present invention, refer to Figure 1 , Figure 2 and Figure 5 A side slide groove 351 is provided on one side surface of the oil guide block 35, and an extrusion block 355 is installed on the other side surface of the oil guide block 35. A connecting block 353 is provided inside the side slide groove 351, and the connecting block 353 is fixedly connected to the side wall of the auxiliary oil chamber 32. A connecting spring 354 is provided on the surface of the connecting block 353, and one end of the connecting spring 354 is connected to the inner wall surface of the side slide groove 351.

[0052] In this embodiment, when the squeezing ball 361 squeezes one end surface of the oil guide block 35 , the oil guide block 35 moves inward along the auxiliary oil chamber 32 , the connecting block 353 slides along the side sliding groove 351 , and the connecting spring 354 is compressed.

[0053] As an embodiment of the present invention, refer to Figure 5 and Figure 7 An oil hole groove 352 is formed through the surface of the oil guide block 35 , an oil guide pipe 356 is provided inside the oil hole groove 352 , and one end of the oil guide pipe 356 is connected to the retaining frame 2 .

[0054] In this embodiment, the oil guide pipe 356 has a sufficient length, and even if a killing action occurs, no pulling force is applied to the oil guide pipe 356. When the oil guide block 35 moves inward along the auxiliary oil chamber 32, a fixed amount of grease is filled between the auxiliary oil chamber 32 and the oil guide block 35, and the interior of the oil hole groove 352 and the oil guide pipe 356 are also filled with grease. When the oil guide block 35 squeezes the grease, a certain amount of grease enters the oil hole groove 352 under the action of pressure, and the end of the oil guide pipe 356 corresponds to the oil outlet hole 37, then a certain amount of grease is squeezed out from the oil outlet hole 37 and directly contacts the steel ball 4. Under the rolling action of the steel ball 4, the steel ball 4 evenly spreads the grease on the contact surface of the inner and outer raceways, and then the steel ball 4 at the extreme position can be replenished with oil separately to ensure the lubrication requirements.

[0055] As an embodiment of the present invention, refer to Figure 1 , Figure 5 and Figure 8A refueling hole 311 and a sliding groove 313 are provided on the wall of the main oil chamber 31. The main oil chamber 31 is connected with the auxiliary oil chamber 32 through the refueling hole 311. The sliding groove 313 is located on one side of the refueling hole 311. A sliding block 314 is provided on the inner side of the sliding groove 313.

[0056] In this embodiment, the grease inside the main oil chamber 31 enters the auxiliary oil chamber 32 through the refueling hole 311. Since the fluidity of the grease is very poor and the inner size of the refueling hole 311 is very small, the grease inside the two chambers will not flow through the refueling hole 311 under normal pressure. When the action is not stopped, the grease between the auxiliary oil chamber 32 and the oil guide block 35 is not filled. As the oil guide block 35 moves, until the side wall of the oil guide block 35 blocks the refueling hole 311, the grease will be filled in the chamber formed by the auxiliary oil chamber 32 and the oil guide block 35, and the oil guide block 35 will continue to move downward. At this time, the grease is under pressure, the refueling hole 311 is blocked, and there is only one pressure relief port, the oil hole groove 352, a small amount of grease enters the oil hole groove 352, and a corresponding amount of grease is squeezed out at the oil outlet hole 37 to complete the oil replenishment action.

[0057] As an embodiment of the present invention, refer to Figure 5 and Figure 8 The side wall of the main oil chamber 31 is provided with an arc pressing piece 312, one end of which is connected to the sliding block 314, and the arc pressing piece 312 corresponds to the position of the oil filling hole 311. The side surface of the sliding block 314 is provided with an extrusion bevel 315, and the extrusion block 355 is limitedly connected with the extrusion bevel 315.

[0058] In this embodiment, by using the inclined surface structure of the extrusion chute 315, when the extrusion block 355 squeezes the extrusion chute 315, the sliding block 314 will move along the sliding groove 313, and the arc pressing piece 312 will no longer fit the cavity wall of the main oil chamber 31, so that one end of the oil filling hole 311 will not be blocked, and because there is a large space between the arc pressing piece 312 and the cavity wall of the main oil chamber 31, the grease will enter between the two. When the killing action is completed, the extrusion piece 36 uses the spring hinge to restore the tilted state, and the oil guide block 35 is connected to the oil guide block 35. The elastic force of the connecting spring 354 quickly returns to its original position. Under the traction of the extrusion block 355, the sliding block 314 returns to its original position, and the arc pressing plate 312 fits against the wall of the main oil chamber 31 again, and a part of the grease between the arc pressing plate 312 and the main oil chamber 31 flows into the auxiliary oil chamber 32 along the refueling hole 311, thereby replenishing the grease inside the auxiliary oil chamber 32, so that the grease inside the auxiliary oil chamber 32 is kept quantitative, so as to facilitate the repeated oil replenishment operation during the next killing action.

[0059] As an embodiment of the present invention, refer to Figure 6Six ball grooves are provided on the surface of the retaining frame 2, and the ball grooves match the steel balls 4. Oil outlet holes 37 are provided on the inner surfaces of the ball grooves, and the oil outlet holes 37 are connected to the oil guide pipe 356.

[0060] In this embodiment, each steel ball 4 corresponds to an oil outlet 37. Each time a killing action occurs, the stress on the steel ball 4 in the corresponding direction and the contact surface of the inner and outer raceways is the greatest, so a small amount of oil replenishing operation is performed on the steel ball 4. Because the working environment of the excavator is small and limited and the killing action is frequent, the six steel balls 4 will be replenished with oil, which can also meet daily lubrication needs.

[0061] As an embodiment of the present invention, refer to Figure 5 and Figure 8 , a fixed amount of grease is filled inside the auxiliary oil chamber 32.

[0062] In this embodiment, the displacement distance of the oil guide block 35 in each dead-end action is equal, and a certain amount of grease is always contained in the auxiliary oil chamber 32, so the extrusion force is consistent each time, and the amount of extruded grease is also consistent.

[0063] Working principle: Each time a killing action occurs, the extrusion piece 36 is flipped by the offset of the retaining frame 2, the connecting ball and the outer sleeve rod 23, and then the oil guide block 35 is squeezed to make it displace in the auxiliary oil chamber 32. The grease is squeezed out through the interaction between the oil guide block 35 and the auxiliary oil chamber 32, and is transported to the steel ball 4 through the oil guide pipe 356 for lubrication. At the same time, the main oil chamber 31 replenishes the grease to the auxiliary oil chamber 32 through the refueling hole 311 and the arc pressure piece 312 after the killing action is completed, ensuring that a small amount of grease is replenished to the steel ball 4 in the extreme position, and then the grease is applied to the contact surface of the inner and outer raceways by the rolling of the steel ball 4 to meet the high lubrication demand of the steel ball 4 in the killing direction.

[0064] Specifically, in order to solve the problem of wear of the dust-proof rubber sleeve 5 during oil replenishment and maintenance of the ball cage universal joint, by transferring the oil filling port to the outer surface of the simple shell 3, grease can be replenished through this position later without damaging the dust-proof rubber sleeve 5. Sufficient grease is stored inside the main oil chamber 31, and a trace amount of grease is indirectly replenished inside the universal joint through the auxiliary oil chamber 32, and the dust-proof rubber sleeve 5 will not be moved due to oil filling and maintenance. One end of the dust-proof rubber sleeve 5 can be locked and fixed to the surface of the shaft body by a buckle 8, or welded and fixed to the surface of the transmission shaft 7, extending the service life of the dust-proof rubber sleeve 5, which is conducive to enhancing the protective function of the dust-proof rubber sleeve 5 on the grease.

[0065] In order to solve the problem that when the steel ball 4 contacts the extreme position of the raceway in the dead-end direction, the contact area is limited, the stress is increased, and the lubrication demand increases. Every time the dead-end action occurs, a small amount of oil will be added to the steel ball 4 at the extreme position to meet the lubrication demand during this action and avoid increased wear. The specific operation is as follows:

[0066] When the universal joint is in the dead position, the retaining frame 2 and the ball groove member 21, connecting ball 1 22, outer rod 23, inner slide rod 24 and connecting ball 25 connected thereto are deflected, and the magnetic block 1 26 on the outer rod 23 gradually approaches the magnetic block 2 362 at one end of the extrusion member 36 and is magnetically docked, driving the extrusion member 36 as a whole to flip around the movable opening 34 as the axis, and the extrusion ball 361 at the other end correspondingly flips and squeezes the surface of the oil guide block 35. Under the extrusion action, the oil guide block 35 moves inward along the auxiliary oil chamber 32, and the connecting block 353 slides in the side slide groove 351, and the connecting spring 354 is compressed. The displacement of the oil guide block 35 causes the grease in the auxiliary oil chamber 32 to be pressurized, and part of the grease enters the oil guide pipe 356 through the oil hole groove 352 and is finally squeezed out from the oil outlet hole 37, and the grease directly contacts the steel ball 4 and the inner and outer raceways in the corresponding direction.

[0067] After each killing action, the grease is squeezed out and replenished according to the above steps. Since a fixed amount of grease is contained in the auxiliary oil chamber 32 and the displacement distance of the oil guide block 35 is equal in each killing action, the amount of grease squeezed out each time is also consistent.

[0068] In order to prevent the quantitative grease in the auxiliary oil chamber 32 from being reduced due to the oil replenishment operation, each time the oil replenishment operation occurs, the arc pressing piece 312 will squeeze the grease stored in the main oil chamber 31 into the auxiliary oil chamber 32 through the oil filling hole 311 by utilizing the return of the oil guide block 35, so as to maintain the quantitative grease in the auxiliary oil chamber 32. The specific operation is as follows:

[0069] When the killing action is completed, the retaining frame 2, the ball groove part 21, the connecting ball 1 22, the outer rod 23, the inner slide rod 24 and the connecting ball 2 25 return to their normal positions, the magnetic block 1 26 is separated from the magnetic block 2 362, and the extrusion piece 36 is reset under the action of the spring hinge. The oil guide block 35 quickly returns to its original position under the elastic force of the connecting spring 354. In the process of the oil guide block 35 returning to its original position, the extrusion block 355 squeezes the extrusion chute 315 of the sliding block 314, so that the sliding block 314 moves along the sliding groove 313, and the arc pressing piece 312 is separated from the cavity wall of the main oil chamber 31. The grease in the main oil chamber 31 enters the auxiliary oil chamber 32 through the refueling hole 311 to replenish the amount of grease squeezed out due to the killing action. When the oil guide block 35 and the sliding block 314 are restored to their original positions, the arc pressing piece 312 fits against the cavity wall of the main oil chamber 31 again to ensure that the grease will not be lost for no reason.

[0070] In order to prevent the oil replenishment operation from occurring when the excavator is in a non-dead state, a magnetic block 26 and a magnetic block 362 are respectively arranged on the outer rod 23 and the extrusion piece 36. In the non-dead state, the distance between the two magnetic blocks is far enough, and the magnetic attraction is not enough to cause the extrusion piece 36 to flip or move.

[0071] In order to prevent the problem of excessive grease inside the universal joint, the flow of grease in the absence of pressure is limited by the tight fit between the oil guide block 35 and the auxiliary oil chamber 32, as well as the small size structure of the refueling hole 311 and the oil guide pipe 356. The grease will only be squeezed out under the pressure generated by the killing action. In the normal pressure-free state, the grease inside the two chambers will not flow through the refueling hole 311, thereby avoiding excessive loss of grease.

[0072] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A needle-free high-load universal joint assembly, comprising a star sleeve (1), a retaining frame (2), a cylindrical shell (3) and a steel ball (4), characterized in that: The bottom surface of the retainer (2) is provided with a ball groove (21), the inner side of the ball groove (21) is provided with a connecting ball (22), the bottom surface of the connecting ball (22) is installed with an outer rod (23), the inner side of the outer rod (23) is provided with an inner slide rod (24), and one end of the inner slide rod (24) is installed with a connecting ball (25), and the interior of the cylindrical shell (3) is provided with a main oil chamber (31), a secondary oil chamber (32) and a funnel. The main oil chamber (31) and the auxiliary oil chamber (32) are used to store grease, the auxiliary oil chamber (32) is located inside the main oil chamber (31), the funnel notch (33) is located inside the auxiliary oil chamber (32), six movable openings (34) are formed on the upper end surface of the funnel notch (33), an oil guide block (35) is installed inside the auxiliary oil chamber (32), and an extrusion piece (36) is provided inside the movable opening (34); The retaining frame (2), connecting ball 1 (22), connecting ball 1 (22) and outer sleeve rod (23) are deflected by the killing action and trigger the extrusion piece (36) to flip. The oil guide block (35) is displaced in the auxiliary oil chamber (32) under the pressure of the extrusion piece (36). The grease is squeezed out through the interaction between the oil guide block (35) and the auxiliary oil chamber (32), and the grease in the auxiliary oil chamber (32) is transported to the steel ball (4) in the killing direction. After the killing action is completed, the main oil chamber (31) replenishes the auxiliary oil chamber (32) with the same amount of grease.

2. The high-load-bearing universal joint assembly without a needle roller according to claim 1, characterized in that: One end of the extrusion piece (36) is provided with an extrusion ball (361), and the other end of the extrusion piece (36) is provided with a second magnetic block (362).

3. The high-load-bearing universal joint assembly without a needle roller according to claim 2, characterized in that: One end of the outer sleeve rod (23) is provided with a magnetic block 1 (26), and the magnetic block 1 (26) is magnetically connected to the magnetic block 2 (362).

4. The high-load-bearing universal joint assembly without a needle roller according to claim 1, characterized in that: A side sliding groove (351) is provided on one side surface of the oil guide block (35), an extrusion block (355) is installed on the other side surface of the oil guide block (35), a connection block (353) is provided inside the side sliding groove (351), and the connection block (353) is fixedly connected to the side wall of the auxiliary oil chamber (32).

5. The high-load universal joint assembly without a needle roller according to claim 4, characterized in that: A connecting spring (354) is provided on the surface of the connecting block (353), and one end of the connecting spring (354) is connected to the inner wall surface of the side sliding groove (351).

6. The high-load-bearing universal joint assembly without a needle roller according to claim 1, characterized in that: An oil hole groove (352) is formed through the surface of the oil guide block (35), an oil guide pipe (356) is provided inside the oil hole groove (352), and one end of the oil guide pipe (356) is connected to the retaining frame (2).

7. The high-load-bearing universal joint assembly without a needle roller according to claim 6, characterized in that: The surface of the retaining frame (2) is provided with six ball grooves, the ball grooves of the retaining frame (2) match the steel balls (4), the inner surfaces of the ball grooves of the retaining frame (2) are provided with oil outlet holes (37), and the oil outlet holes (37) of the retaining frame (2) are connected to the oil guide pipe (356).

8. The high-load-bearing universal joint assembly without a needle roller according to claim 1, characterized in that: The wall surface of the main oil chamber (31) is provided with a refueling hole (311) and a sliding groove (313); the refueling hole (311) is connected with the main oil chamber (31) and the auxiliary oil chamber (32); the sliding groove (313) is located on one side of the refueling hole (311); and a sliding block (314) is provided inside the sliding groove (313).

9. The high-load-bearing universal joint assembly without a needle roller according to claim 8, characterized in that: The side wall surface of the main oil chamber (31) is provided with an arc-pressing sheet (312), one end of which is connected to the sliding block (314), the arc-pressing sheet (312) corresponds to the position of the oil filling hole (311), the side surface of the sliding block (314) is provided with an extrusion inclined groove (315), and the extrusion block (355) is limitedly connected to the extrusion inclined groove (315).

10. The high-load-bearing universal joint assembly without a needle roller according to claim 1, characterized in that: A fixed amount of lubricating grease is filled inside the auxiliary oil chamber (32).

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