Efficient lubricating needle bearing cross shaft

Abstract

The invention relates to the technical field of cross shafts, and discloses an efficient lubricating needle bearing cross shaft which comprises a cross center part, a first oil injection assembly is arranged on the cross center part, a second oil injection assembly is arranged in the cross center part, and the first oil injection assembly comprises an oil injection nozzle. A first oil cavity is formed in the cross-shaped center part, and a first oil injection groove is formed in the cross-shaped center part. According to the efficient lubricating needle bearing cross shaft, a grease gun is used, an oil outlet of the grease gun is tightly pressed on an oil injection nozzle, it is ensured that lubricating oil enters a first oil cavity through the oil injection nozzle under the pressure effect, and a first sealing plate and a first spring move downwards to the position below a communicating hole channel under the pressure effect; and meanwhile, after the second oil cavity is filled with the lubricating oil, the first oil cavity is slowly filled with the lubricating oil, the lubricating oil flows out of the first oil injection groove, and primary oil injection can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of cross shafts, in particular to a high-efficiency lubricated needle roller bearing cross shaft. Background Art

[0002] A cross shaft is a mechanical transmission component with a cross-shaped structure. It is usually composed of a shaft body and four journals. The four journals are perpendicular to each other and can be connected to different components respectively. They are used to transmit torque and rotational motion between two shafts with angle changes or spatial interlacing. They are commonly found in mechanical structures such as universal joints to achieve flexible transmission of power in different directions and angles.

[0003] Cross shafts are primarily used in automotive drive shafts, industrial machinery, and wind turbine yaw systems. Traditional needle roller bearing cross shafts are commonly lubricated with grease or manually oiled. This has the following drawbacks: a lack of speed-adaptive lubrication control. This, particularly in automotive drive shaft applications, requires periodic downtime for manual oiling, impacting the equipment's continuous operation efficiency. Therefore, a highly efficient needle roller bearing cross shaft lubrication system was proposed to address these issues. Summary of the Invention

[0004] The object of the present invention is to provide a highly efficient lubricated needle roller bearing cross shaft to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a highly efficient lubricated needle roller bearing cross shaft, comprising a cross center portion, a first oil injection assembly being provided on the cross center portion, and a second oil injection assembly being provided inside the cross center portion; The first oil injection assembly includes an oil injection nozzle, a first oil chamber is opened inside the center portion of the cross, a first oil injection groove is opened inside the center portion of the cross, a second oil chamber is opened inside the center portion of the cross and is located below the first oil chamber, a connecting channel is opened inside the center portion of the cross, a first spring is fixedly connected to the inside of the center portion of the cross, and a first sealing plate is fixedly connected to the top of the first spring.

[0006] Preferably, four journals are mounted on the cross center portion and are distributed in a cross pattern. A retaining frame is mounted on the outer side of the journal. Rolling bodies are mounted in the retaining frame. An outer ring is mounted on the outer side of the retaining frame.

[0007] Preferably, the oil filling nozzle is fixedly connected to the top of the cross center portion and a top cover is threadedly connected to the outer side thereof, and the oil filling nozzle is communicated with the top of the first oil chamber.

[0008] Preferably, a mounting groove is opened inside the cross center portion, the top of the mounting groove is connected to the first oil chamber, the first spring is fixedly connected in the mounting groove, and the first sealing plate is tightly fitted to the inner wall of the mounting groove.

[0009] Preferably, the number of the first oil filling grooves is four and they are centrally symmetrically distributed, and the first oil filling grooves are connected to the first oil chamber.

[0010] Preferably, the number of the connecting channels is four and they are centrally symmetrically distributed, the connecting channels connect the first oil chamber and the second oil chamber, and the moving distance of the first sealing plate is greater than the vertical height of the connecting channel from the first oil chamber.

[0011] Preferably, the second oil filling assembly includes a mounting frame, a second spring is fixedly connected to the interior of the mounting frame, a connecting plate is fixedly connected to the side of the second spring away from the inner wall of the mounting frame, a connecting rod is fixedly connected to the side of the connecting plate away from the second spring, a second sealing plate is fixedly connected to the side of the connecting rod away from the connecting plate, and a second oil filling groove is opened inside the center portion of the cross.

[0012] Preferably, four mounting cavities are opened inside the cross center portion and are centrally symmetrically distributed. The mounting cavities are connected to the second oil cavity. The mounting frame is fixedly connected in the mounting cavity, and the second sealing plate is tightly fitted to the inner wall of the mounting cavity.

[0013] Preferably, the number of the second oil filling grooves is four and they are centrally symmetrically distributed, the four second oil filling grooves are respectively connected to four mounting cavities, and the moving distance of the second sealing plate is greater than the distance between the second oil filling groove and the second oil cavity.

[0014] Preferably, the preload force of the second spring is set to 20N, the mass of the second sealing plate is 0.02kg, the distance from the center of mass of the second sealing plate to the axis of the cross center is 10cm, and the second sealing plate moves outward 5mm when the cross center rotates at high speed.

[0015] Compared with the prior art, the present invention has the following beneficial effects: First, the present invention uses a grease gun to press its oil outlet tightly against the oil filling nozzle, ensuring that the lubricating oil enters the first oil chamber through the oil filling nozzle under the action of pressure. The first sealing plate and the first spring move downward to the bottom of the connecting channel under the action of pressure, so that the lubricating oil enters the second oil chamber through the connecting channel and is stored. At the same time, after the lubricating oil fills the second oil chamber, it will slowly fill the first oil chamber and flow out from the first oil filling groove, thereby realizing initial oil filling.

[0016] Second, when the center part of the cross is running at high speed, centrifugal force is generated. Under the action of centrifugal force, the second sealing plate is pushed to move toward the side of the connecting plate until the second oil filling groove is exposed. Lubricating oil is filled through the second oil filling groove, so that the entire cross shaft can achieve the benefit of automatic oil filling during use, greatly improving the lubrication effect of the entire cross shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic structural diagram of the retainer and related parts of the present invention; Figure 3 It is a schematic diagram of the cutaway structure of the present invention; Figure 4 This is a schematic structural diagram of the first oil injection assembly and its related parts of the present invention; Figure 5 This is a schematic structural diagram of the second oil injection assembly and its related parts of the present invention; Figure 6 For the present invention Figure 3 Enlarged view of point A in the middle.

[0018] Among them: 1. Cross center part; 101. Shaft neck; 102. Retaining frame; 103. Rolling element; 104. Outer ring; 2. First oil filling assembly; 201. Oiling nozzle; 202. First oil chamber; 203. First oil filling groove; 204. Second oil chamber; 205. Connecting channel; 206. First spring; 207. First sealing plate; 3. Second oil filling assembly; 301. Mounting frame; 302. Second spring; 303. Connecting plate; 304. Connecting rod; 305. Second sealing plate; 306. Second oil filling groove. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0020] The present invention provides the following technical solutions: Example 1 See also Figure 1 、 Figure 2 、 Figure 3 and Figure 5 , a highly efficient lubricated needle roller bearing cross shaft, comprising a cross center portion 1, on which a first oil injection assembly 2 is provided; The first oil injection assembly 2 includes an oil injection nozzle 201, a first oil chamber 202 is opened inside the cross center part 1, a first oil injection groove 203 is opened inside the cross center part 1, a second oil chamber 204 is opened inside the cross center part 1 and is located below the first oil chamber 202, a connecting channel 205 is opened inside the cross center part 1, a first spring 206 is fixedly connected to the inside of the cross center part 1, and a first sealing plate 207 is fixedly connected to the top of the first spring 206.

[0021] Four journals 101 arranged in a cross pattern are mounted on the cross center portion 1 . A retainer 102 is mounted on the outside of the journal 101 . Rolling elements 103 are mounted inside the retainer 102 . An outer ring 104 is mounted on the outside of the retainer 102 .

[0022] Multi-directional power transmission is achieved through the cooperation of four cross-distributed journals 101 with the cage 102, rolling elements 103 and outer ring 104. At the same time, the cage 102 ensures that the rolling elements 103 are evenly distributed, reducing friction and wear, and improving the bearing capacity and service life.

[0023] The oiling nozzle 201 is fixedly connected to the top of the cross center portion 1 and a top cover is threadedly connected to the outer side thereof. The oiling nozzle 201 is communicated with the top of the first oil chamber 202 .

[0024] The communication design between the oil filling nozzle 201 and the first oil chamber 202, combined with the top cover connected with the outer thread, facilitates the filling and sealing of external lubricating oil, ensuring the long-term stable operation of the lubrication system.

[0025] A mounting groove is provided inside the cross center portion 1 , the top of which is connected to the first oil chamber 202 , the first spring 206 is fixedly connected in the mounting groove, and the first sealing plate 207 is tightly fitted to the inner wall of the mounting groove.

[0026] The mounting groove is communicated with the first oil chamber 202 , and the first spring 206 and the first sealing plate 207 cooperate closely to close the oil circuit when stationary or at low speed to prevent leakage of lubricating oil.

[0027] There are four first oil filling grooves 203 , which are centrally symmetrically distributed. The first oil filling grooves 203 are connected to the first oil chamber 202 .

[0028] The four first oil filling grooves 203 symmetrically distributed on the center are connected to the first oil chamber 202 to ensure that the lubricating oil is evenly distributed to each journal 101, thereby avoiding local insufficient lubrication and improving the overall lubrication efficiency.

[0029] There are four connecting channels 205 , which are centrally symmetrically distributed. The connecting channels 205 connect the first oil chamber 202 and the second oil chamber 204 . The moving distance of the first sealing plate 207 is greater than the vertical height of the connecting channel 205 from the first oil chamber 202 .

[0030] Four centrally symmetrical connecting channels 205 connect the first oil chamber 202 and the second oil chamber 204. The moving distance design of the first sealing plate 207 ensures that under the pressure of the grease gun, the lubricating oil can enter the second oil chamber 204 through the connecting channels 205 and be stored, so as to achieve the effect of automatic oil filling and lubrication later.

[0031] Through the above technical solution, by using a grease gun, its oil outlet is pressed tightly against the oil filling nozzle 201, ensuring that the lubricating oil enters the first oil chamber 202 through the oil filling nozzle 201 under the action of pressure, and the first sealing plate 207 and the first spring 206 move downward to the bottom of the connecting channel 205 under the action of pressure, so that the lubricating oil enters the second oil chamber 204 through the connecting channel 205 and is stored. At the same time, after the lubricating oil fills the second oil chamber 204, it will slowly fill the first oil chamber 202 and flow out from the first oil filling groove 203, so that initial oil filling can be achieved.

[0032] Example 2

[0033] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , a highly efficient lubricated needle roller bearing cross shaft, wherein a second oil injection assembly 3 is provided inside the cross center portion 1; The second oil filling assembly 3 includes a mounting frame 301, a second spring 302 is fixedly connected to the inside of the mounting frame 301, a connecting plate 303 is fixedly connected to the side of the second spring 302 away from the inner wall of the mounting frame 301, a connecting rod 304 is fixedly connected to the side of the connecting plate 303 away from the second spring 302, a second sealing plate 305 is fixedly connected to the side of the connecting rod 304 away from the connecting plate 303, and a second oil filling groove 306 is opened inside the cross center part 1.

[0034] The second oil filling assembly 3 automatically opens the second oil filling groove 306 under the action of high-speed centrifugal force through the linkage design of the installation frame 301, the second spring 302, the connecting plate 303, the connecting rod 304 and the second sealing plate 305, providing double lubrication protection and enhancing reliability.

[0035] Four mounting cavities are provided inside the cross center portion 1 and are symmetrically distributed. The mounting cavities are connected to the second oil chamber 204 . The mounting frame 301 is fixedly connected in the mounting cavity, and the second sealing plate 305 is tightly fitted to the inner wall of the mounting cavity.

[0036] The four mounting cavities are connected to the second oil chamber 204, and the mounting frame 301 is fixed therein. The second sealing plate 305 fits tightly against the chamber wall to ensure sealing at low speed. At high speed, centrifugal force pushes the sealing plate open, and the lubricating oil is accurately injected into the key parts of the bearing through the second oil filling groove 306.

[0037] There are four second oil filling grooves 306 and they are centrally symmetrically distributed. The four second oil filling grooves 306 are connected to the four mounting cavities respectively. The moving distance of the second sealing plate 305 is greater than the distance between the second oil filling groove 306 and the second oil cavity 204.

[0038] The four second oil filling grooves 306 are symmetrically distributed, and the moving distance of the second sealing plate 305 and the second spring 302 with a preload of 20N ensure that the oil filling is automatically started at the set speed.

[0039] The preload force of the second spring 302 is set to 20N, the mass of the second sealing plate 305 is 0.02kg, the distance between the center of mass of the second sealing plate 305 and the axis of the cross center 1 is 10cm, and the second sealing plate 305 moves outward 5mm when the cross center 1 rotates at high speed.

[0040] The counterweight design of 0.02kg mass and 10cm rotation radius enables centrifugal force to precisely control the timing of oil injection and optimize lubrication efficiency. The operating speed of the drive shaft of an ordinary automobile often reaches 2000-4000rpm, while that of high-performance racing vehicles can reach over 6000rpm. When the speed of the cross center portion 1 reaches 1000rpm, the second sealing plate 305, under the action of centrifugal force, overcomes the 20N preload force of the second spring 302 and moves outward by 5mm. At this time, the rotation radius increases to 10.5cm. According to the centrifugal force formula Fc=m·r·ω², where ω=2π×1000 / 60≈104.72rad / s, the generated centrifugal force is approximately 23N, exceeding the spring preload force of 20N, thereby pushing the second sealing plate 305 to open the second oil injection groove 306, realizing speed-triggered automatic oil injection. This design ensures precise initiation of lubrication at the critical speed of 1000rpm, avoiding low-speed leakage and high-speed oil shortage.

[0041] Through the above technical solution, when the cross center part 1 is running at high speed, centrifugal force will be generated. Under the action of centrifugal force, the second sealing plate 305 will be pushed to the side of the connecting plate 303 until the second oil filling groove 306 is exposed. Lubricating oil is injected through the second oil filling groove 306, so that the entire cross shaft can achieve the benefit of automatic oiling during use, greatly improving the lubrication effect of the entire cross shaft.

[0042] During use, first, lubricating oil is injected into the first oil chamber 202 through the oil filling nozzle 201. Under the action of oil pressure, the first sealing plate 207 is pushed to compress the first spring 206 and move downward, so that the lubricating oil enters the second oil chamber 204 through the connecting channel 205 for storage. When the lubricating oil fills the second oil chamber 204, it will continue to fill the first oil chamber 202 and flow out through the first oil filling groove 203 to complete the initial lubrication. When the cross center part 1 used in the automobile drive shaft starts to rotate, the four journals 101 drive the retaining frame 102 and the rolling element 103 to rotate in the outer ring 104. At this time, the first sealing plate 207 keeps the oil circuit closed under the action of centrifugal force. When the speed reaches 1000rpm, the second sealing plate 305 overcomes the 20N preload of the second spring 302 under the action of centrifugal force and moves outward by 5mm, so that its center of mass rotation radius increases to 10.5cm. The 23N centrifugal force generated at this time pushes the connecting rod 304 The second sealing plate 305 is driven to open the second oil filling groove 306, and the lubricating oil in the second oil chamber 204 is precisely sprayed from the second oil filling groove 306 to the contact area of ​​the rolling element 103 through the mounting chamber. During the whole process, the four first oil filling grooves 203 and the second oil filling groove 306 that are symmetrically distributed in the center ensure that each shaft neck 101 is evenly lubricated. The second spring 302 in the mounting frame 301 accurately controls the opening and closing timing of the second sealing plate 305 through the connecting plate 303 to achieve speed-adaptive lubrication. When the speed decreases, the second spring 302 pulls the second sealing plate 305 back to its original position to close the second oil filling groove 306, and the first sealing plate 207 is also reset under the action of the first spring 206, forming a double seal to prevent leakage. This design realizes initial oil storage through the first oil filling component 2, and uses the centrifugal trigger mechanism of the second oil filling component 3 to complete intelligent oil replenishment during operation, so that the cross shaft always maintains the best lubrication state under high-speed working conditions.

[0043] While 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 alterations may be made to the embodiments without departing from the principles and spirit thereof, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A highly efficient lubricated needle roller bearing cross shaft, comprising a cross center portion (1), characterized in that: A first oil injection assembly (2) is provided on the cross center portion (1), and a second oil injection assembly (3) is provided inside the cross center portion (1); The first oil injection assembly (2) includes an oil injection nozzle (201), a first oil chamber (202) is provided inside the cross center portion (1), a first oil injection groove (203) is provided inside the cross center portion (1), a second oil chamber (204) located below the first oil chamber (202) is provided inside the cross center portion (1), a connecting channel (205) is provided inside the cross center portion (1), a first spring (206) is fixedly connected inside the cross center portion (1), and a first sealing plate (207) is fixedly connected to the top of the first spring (206).

2. The high-efficiency lubricated needle roller bearing cross shaft according to claim 1, characterized in that: Four shaft necks (101) arranged in a cross-shaped pattern are mounted on the cross center portion (1), a retaining frame (102) is mounted on the outside of the shaft neck (101), a rolling body (103) is mounted inside the retaining frame (102), and an outer ring (104) is mounted on the outside of the retaining frame (102).

3. The high-efficiency lubricated needle roller bearing cross shaft according to claim 1, characterized in that: The oiling nozzle (201) is fixedly connected to the top of the cross center portion (1) and has a top cover threadedly connected to its outer side. The oiling nozzle (201) is in communication with the top of the first oil chamber (202).

4. The high-efficiency lubricated needle roller bearing cross shaft according to claim 1, characterized in that: A mounting groove is provided inside the cross center portion (1), the top of the mounting groove is communicated with the first oil chamber (202), the first spring (206) is fixedly connected in the mounting groove, and the first sealing plate (207) is tightly fitted with the inner wall of the mounting groove.

5. The high-efficiency lubricated needle roller bearing cross shaft according to claim 1, characterized in that: The number of the first oil filling grooves (203) is four and they are centrally symmetrically distributed. The first oil filling grooves (203) are in communication with the first oil chamber (202).

6. The high-efficiency lubricated needle roller bearing cross shaft according to claim 1, characterized in that: The number of the communicating channels (205) is four and they are centrally symmetrically distributed. The communicating channels (205) connect the first oil chamber (202) and the second oil chamber (204). The moving distance of the first sealing plate (207) is greater than the vertical height of the communicating channels (205) from the first oil chamber (202).

7. The high-efficiency lubricated needle roller bearing cross shaft according to claim 1, characterized in that: The second oil injection assembly (3) comprises a mounting frame (301), a second spring (302) is fixedly connected to the interior of the mounting frame (301), a connecting plate (303) is fixedly connected to the side of the second spring (302) away from the inner wall of the mounting frame (301), a connecting rod (304) is fixedly connected to the side of the connecting plate (303) away from the second spring (302), a second sealing plate (305) is fixedly connected to the side of the connecting rod (304) away from the connecting plate (303), and a second oil injection groove (306) is provided inside the cross center portion (1).

8. The high-efficiency lubricated needle roller bearing cross shaft according to claim 7, characterized in that: Four mounting cavities are provided inside the cross center portion (1) and are distributed symmetrically with respect to the center. The mounting cavities are communicated with the second oil cavity (204). The mounting frame (301) is fixedly connected in the mounting cavity, and the second sealing plate (305) is tightly fitted with the inner wall of the mounting cavity.

9. The high-efficiency lubricated needle roller bearing cross shaft according to claim 8, characterized in that: The number of the second oil filling grooves (306) is four and they are centrally symmetrically distributed. The four second oil filling grooves (306) are respectively connected to the four mounting cavities. The moving distance of the second sealing plate (305) is greater than the distance between the second oil filling groove (306) and the second oil cavity (204).

10. The high-efficiency lubricated needle roller bearing cross shaft according to claim 7, characterized in that: The preload force of the second spring (302) is set to 20N, the mass of the second sealing plate (305) is 0.02kg, the distance between the center of mass of the second sealing plate (305) and the axis of the cross center (1) is 10cm, and when the cross center (1) rotates at high speed, the second sealing plate (305) moves outward by 5mm.

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