Stamping outer ring needle bearing high temperature grease heating and injecting device

Abstract

This invention discloses a high-temperature grease heating and grease injection device for stamped outer ring needle roller bearings, belonging to the field of bearing grease injection technology. It includes a grease injection unit with a micro-quantitative valve and a grease injection head inserted into the needle roller bearing. The micro-quantitative valve is located at the top of the grease injection head and is interconnected. The grease injection head has radially opened grease outlet holes, and the grease flowing from the outlet holes circumferentially covers the area of ​​the needle roller bearing requiring grease injection. A heating ring for heating the grease is located between the micro-quantitative valve and the grease injection head, close to the grease injection head. The heating ring maintains a constant temperature for the grease flowing into the grease injection head. Combined with the rotation of the clamp, under the dual action of centrifugal force and high-temperature grease, the stable grease is evenly spread inside the needle roller bearing. This invention avoids the problems of existing devices where heat loss is rapid during grease transfer, making it difficult to maintain the temperature, resulting in increased grease viscosity and decreased fluidity upon reaching the grease injection station, leading to unstable grease injection results.

Description

Technical Field

[0001] This invention relates to the field of bearing grease injection technology, specifically a high-temperature grease heating and grease injection device for stamped outer ring needle roller bearings. Background Technology

[0002] Stamped outer ring needle roller bearings are rolling bearings characterized by a thin-walled stamped outer ring. Due to their advantages such as small radial cross-section, high load-carrying capacity, light weight, and convenient installation, they are widely used in automotive transmissions, engine rocker arms, power tools, household appliances, and industrial automation equipment. During bearing assembly, grease filling is a critical process that determines the bearing's operating performance, temperature rise characteristics, and service life. The quality of grease filling directly affects the reliability and durability of the bearing under high-speed and high-temperature conditions.

[0003] As bearing applications become increasingly demanding, more and more stamped outer ring needle roller bearings need to operate in high-temperature environments, thus placing higher requirements on the temperature resistance of lubricating greases. High-temperature lubricating greases typically use thickener systems such as complex lithium-based, polyurea-based, or complex calcium sulfonate, whose base oils have high viscosity and consistency. Under normal or low-temperature conditions, their fluidity decreases significantly, and they may even exhibit a semi-solid or paste-like form, posing great difficulties for grease application.

[0004] In existing processes, the heating and softening of grease and the grease injection operation are often performed at different stations or on different equipment. During the transfer process, the grease loses heat quickly, making it difficult to maintain a stable temperature. This results in the grease viscosity increasing and its fluidity decreasing by the time it reaches the injection station, leading to unstable injection results and increased process turnaround time, making it difficult to match the pace requirements of the assembly line. Current heating methods often employ simple water baths or electric hot plates, resulting in coarse temperature control and widespread localized overheating or temperature fluctuations. Excessive temperatures can cause oxidation of the grease base oil and damage to the thickener structure, degrading grease performance; conversely, insufficient temperatures prevent adequate softening, resulting in poor fluidity and high injection resistance. The lack of precise temperature control methods tailored to the characteristics of high-temperature greases is a significant factor restricting grease injection quality.

[0005] Therefore, it is necessary to provide a high-temperature grease heating and grease injection device for stamped outer ring needle roller bearings to solve the above problems. Summary of the Invention

[0006] In view of the above-mentioned problems in the prior art, the purpose of the present invention is to provide a high-temperature grease heating and grease injection device for stamped outer ring needle roller bearings, so as to solve the problems mentioned in the background art.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a high-temperature grease heating and grease injection device for stamped outer ring needle roller bearings, including a grease injection unit, wherein the grease injection unit has a micro-quantitative valve and a grease injection head inserted into the inside of the needle roller bearing, wherein the micro-quantitative valve is located at the top of the grease injection head and is interconnected with it, wherein the grease injection head has a grease outlet hole in the radial direction, and the grease flowing out of the grease outlet hole circumferentially covers the area of ​​the needle roller bearing that needs to be greased; A chuck is used to clamp and fix the outer ring of a needle roller bearing. The rotating unit drives the chuck to rotate, thereby causing the needle roller bearing to rotate circumferentially. Between the micro-quantitative valve and the grease injection head, there is a heating ring for heating the grease. The heating ring is close to the grease injection head and maintains the grease flowing into the grease injection head at a constant temperature. With the rotation of the chuck, the stable grease is evenly spread in the needle roller bearing under the dual action of centrifugal force and high temperature grease.

[0008] Furthermore, the grease injection unit also includes a transition mounting plate with a transition channel and an oil guide shaft with a grease injection channel. The grease flows sequentially from the micro-quantitative valve through the transition channel and the grease injection channel, and flows out from the grease injection head. An upper sealing ring is provided between the transition mounting plate and the oil guide shaft. The upper end of the upper sealing ring abuts against the bottom of the transition mounting plate, and the lower end abuts against the top of the oil guide shaft. The upper sealing ring surrounds the grease injection channel. The heating ring is fixedly connected to the oil guide shaft. A heating coil is nested circumferentially on the inner circumferential wall of the heating ring, and the inner circumferential wall of the heating coil is in contact with the outer circumferential wall of the oil guide shaft.

[0009] Furthermore, the bottom of the heating coil is flush with the bottom of the oil guide shaft, and the top of the heating coil is close to the center of the oil guide shaft.

[0010] Furthermore, the oil guide shaft is made of stainless steel.

[0011] Furthermore, a temperature control device is fixedly connected to one end of the heating ring, and the temperature control device is electrically connected to the heating coil.

[0012] Furthermore, the oil guide shaft extends downward to a connector, and the outer wall of the connector is provided with external threads; The grease injection head has a connecting cavity that matches the connector. The inner circumferential wall of the connecting cavity has an internal thread, and the connecting cavity and the connector are threadedly connected. A lower sealing ring is provided between the oil guide shaft and the grease injection head. The upper end of the lower sealing ring abuts against the bottom of the oil guide shaft, and the lower end abuts against the top of the grease injection head.

[0013] Furthermore, the grease injection head is provided with a connecting transition cavity and an exhaust cavity. The exhaust cavity is located below the transition cavity, and the exhaust cavity is provided with a plurality of grease outlet holes spaced apart along the circumference.

[0014] Furthermore, the bottom of the grease injection head is a support portion, the outer diameter of which is consistent with the inner diameter of the hollow portion inside the needle roller bearing, and the length is consistent with the height of the needle roller bearing. The root of the supporting part forms a stepped surface with the grease injection head.

[0015] Furthermore, the grease outlet is configured such that when the grease injection head is inserted into the hollow part of the needle roller bearing and the stepped surface abuts against the upper surface of the needle roller bearing, the center of the grease outlet is at the same height as the horizontal center line of the needle roller bearing.

[0016] Furthermore, it also includes an phenolic resin mounting block, a transition mounting plate, an oil guide shaft, and an phenolic resin mounting block that are fixedly connected to each other by bolts. One end of the phenolic resin mounting block is connected to a lifting unit that drives the grease injection unit to move up and down. The bottom of the chuck has a locking unit to control the locking or unlocking of the needle roller bearing.

[0017] The beneficial effects of the present invention are as follows: The high-temperature grease heating and grease injection device for stamped outer ring needle roller bearings provided by the present invention heats the grease for grease injection into the needle roller bearing in the channel by setting a heatable oil guide shaft, thereby reducing the viscosity of the grease and improving its fluidity. This ensures a stable and uniform supply of grease to the needle roller bearing, avoiding the situation in the existing device where the grease loses heat quickly during the transfer process, making it difficult to maintain the temperature, which leads to the grease viscosity rising and the fluidity deteriorating when it reaches the grease injection station, resulting in unstable grease injection effect. By setting a temperature control element, the temperature control range of the heating coil is adjustable within 50-100℃, which can quickly melt high-temperature grease and achieve constant temperature and pressure, matching the mass production rhythm of bearing assembly line and effectively improving the overall production capacity of the production line. The bearing is driven by a rotating unit to achieve centrifugal high-speed rotation. Combined with the flow characteristics of high-temperature grease, the grease spreading effect is enhanced in two ways, ensuring uniform grease injection inside the bearing and eliminating problems such as local grease deficiency and grease accumulation. By incorporating a micro-quantitative valve, precise quantitative grease injection of 0.1-0.3g / time is achieved with controllable error. The grease injection head adopts a quick-connect replaceable thread design, which can be quickly adapted to the grease injection port of different specifications of needle roller bearings. The grease injection pressure can be flexibly adjusted according to the bearing size, effectively preventing excessive pressure from damaging the bearing cage. It is compatible with the entire range of stamped outer ring needle roller bearings. Production specifications can be quickly switched by simply changing the grease injection head and collet. It can meet the flexible production needs of multiple varieties, small batches and large batches, and has high changeover efficiency.

[0018] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0019] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is an overall schematic diagram of the present invention; Figure 2 For the present invention Figure 1 Enlarged diagram of area A in the middle; Figure 3 For the present invention Figure 2 Enlarged diagram of area B in the middle; Figure 4 For the present invention Figure 1 Enlarged diagram of area C; The following are the labeling elements in the figure: 1. Grease injection unit; 11. Micro-quantitative valve; 111. Grease inlet; 12. Transition mounting plate; 121. Transition channel; 13. Bolt; 14. Phenolic resin mounting block; 15. Oil guide shaft; 151. Grease injection channel; 152. Connector; 16. Heating ring; 161. Heating coil; 162. Temperature control; 17. Grease injection head; 171. Connecting cavity; 172. Transition cavity; 173. Discharge cavity; 174. Grease outlet hole; 175. Support part; 176. Stepped surface; 18. Upper sealing ring; 19. Lower sealing ring; 2. Needle roller bearing; 201. Hollow part; 202. Horizontal center line; 3. Chuck; 4. Lifting unit; 5. Rotating unit; 6. Locking unit. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0022] like Figure 1-4 As shown, the present invention provides a technical solution: a high-temperature grease heating and grease injection device for stamped outer ring needle roller bearings, comprising: Grease injection unit 1, which has a micro-quantitative valve 11 and a grease injection head 17 inserted inside the needle roller bearing 2. The micro-quantitative valve 11 is located on the top of the grease injection head 17 and is interconnected with it. The grease injection head 17 has a grease outlet hole 174 in the radial direction. The grease flowing out of the grease outlet hole 174 covers the area of ​​the needle roller bearing 2 that needs to be greased in the circumferential direction. Chuck 3 is used to clamp and fix the outer ring of needle roller bearing 2; Rotating unit 5 drives chuck 3 to rotate, thereby causing needle roller bearing 2 to rotate circumferentially; Between the micro-quantitative valve 11 and the grease injection head 17 is a heating ring 16 for heating the grease. The heating ring 16 is close to the grease injection head 17 and keeps the grease flowing into the grease injection head 17 at a constant temperature. With the rotation of the chuck 3, the stable grease is evenly spread in the needle roller bearing 2 under the dual action of centrifugal force and high temperature grease.

[0023] The grease injection unit 1 also includes a transition mounting plate 12 with a transition channel 121 and an oil guide shaft 15 with a grease injection channel 151. Grease flows from the micro metering valve 11 through the transition channel 121 and the grease injection channel 151 in sequence and flows out from the grease injection head 17. An upper sealing ring 18 is provided between the transition mounting plate 12 and the oil guide shaft 15. The upper end of the upper sealing ring 18 abuts against the bottom of the transition mounting plate 12 and the lower end abuts against the top of the oil guide shaft 15. The upper sealing ring 18 encloses the grease injection channel 151. The heating ring 16 is fixedly connected to the oil guide shaft 15. A heating coil 161 is nested circumferentially on the inner peripheral wall of the heating ring 16, and the inner peripheral wall of the heating coil 161 is in contact with the outer peripheral wall of the oil guide shaft 15.

[0024] The bottom of the heating coil 161 is flush with the bottom of the oil guide shaft 15, and the top of the heating coil 161 is close to the center of the oil guide shaft 15.

[0025] The oil guide shaft 15 is made of stainless steel.

[0026] A temperature control device 162 is fixedly connected to one end of the heating ring 16, and the temperature control device 162 and the heating coil 161 are electrically connected.

[0027] The oil guide shaft 15 extends downward to a connector 152, and the outer wall of the connector 152 is provided with external threads. The grease injection head 17 has a connecting cavity 171 that matches the connector 152. The inner circumferential wall of the connecting cavity 171 has an internal thread, and the connecting cavity 171 and the connector 152 are threadedly connected. A lower sealing ring 19 is provided between the oil guide shaft 15 and the grease injection head 17. The upper end of the lower sealing ring 19 abuts against the bottom of the oil guide shaft 15, and the lower end abuts against the top of the grease injection head 17.

[0028] The grease injection head 17 also has a connecting transition cavity 172 and an exhaust cavity 173. The exhaust cavity 173 is located below the transition cavity 172, and the exhaust cavity 173 has a plurality of grease outlet holes 174 spaced apart along the circumference.

[0029] The bottom of the grease injection head 17 is a support part 175. The outer diameter of the support part 175 is the same as the inner diameter of the hollow part 201 inside the needle roller bearing 2, and the length is the same as the height of the needle roller bearing 2. The root of the supporting part 175 forms a stepped surface 176 with the grease injection head 17.

[0030] The grease outlet 174 is configured such that when the grease injection head 17 is inserted into the hollow part 201 of the needle roller bearing 2 and the stepped surface 176 abuts against the upper surface of the needle roller bearing 2, the center of the grease outlet 174 is at the same height as the horizontal center line 202 of the needle roller bearing 2.

[0031] It also includes an electric phenolic resin mounting block 14, a transition mounting plate 12, an oil guide shaft 15 and an electric phenolic resin mounting block 14 are fixedly connected to each other by bolts 13. One end of the electric phenolic resin mounting block 14 is connected to a lifting unit 4 that drives the grease injection unit 1 to move up and down. The bottom of the chuck 3 has a locking unit 6 to control the locking or loosening of the needle roller bearing 2.

[0032] In one embodiment, the working principle of the heated grease injection unit is as follows: Specifically, grease is filled into the micro-quantitative valve 11 through the grease inlet 111. The heating temperature of the heating coil 161 is adjusted through the temperature control 162. The temperature control range is adjustable from 50 to 100°C according to the operation requirements. At this time, the heating coil 161 transfers the temperature to the oil guide shaft 15, causing the temperature of the inner peripheral wall of the grease injection channel 151 to rise, and the temperature of the entire oil guide shaft 15 to rise. The needle roller bearing 2 is installed in the chuck 3. The cylinder on the locking unit 6 is controlled to pull the lever so that the needle roller bearing 2 is clamped by the chuck 3. Then, the cylinder in the lifting unit 4 drives the phenolic resin mounting block 14 to descend, thereby causing the entire grease injection unit 1 to descend. When the lifting unit 4 descends to its maximum stroke, the grease injection head 17 is located inside the hollow part 201, the stepped surface 176 is in contact with the upper surface of the needle roller bearing 2, and the axis of the grease outlet hole 174 is at the same horizontal position as the horizontal center line 202 of the needle roller bearing 2. Start the rotating unit 5. At this time, the motor drives the gear, so that the chuck 3 drives the needle roller bearing 2 to rotate. Then, control the micro-quantitative valve 11 to pump out the grease. At this time, the grease passes through the transition channel 121, the grease injection channel 151, the transition chamber 172 and the discharge chamber 173 in sequence. When the grease enters the grease injection channel 151, it is subjected to heat transfer from the oil guide shaft 15, which causes the temperature of the grease in the grease injection channel 151 to rise, reduce the viscosity of the grease, and make the grease tend to a stable state. Then, the grease is sent into the needle roller bearing 2 through the grease outlet hole 174. Through the rotation of the needle roller bearing 2 itself, under the action of centrifugal force, the grease located in the needle roller bearing 2 is evenly distributed in the needle roller bearing 2. After the grease injection is completed, the grease injection unit 1 is raised by the lifting unit 4 to disengage from the needle roller bearing 2. Then the rotating unit 5 is closed to stop the rotation of the greased needle roller bearing 2. The locking unit 6 is controlled to release the clamp 3, remove the greased needle roller bearing 2, and then place the next needle roller bearing 2 that needs grease injection. The same steps are repeated for the needle roller bearing 2 that needs grease injection.

[0033] During this process, since the heating coil 161 is always open and the oil guide shaft 15 is always heated, it can keep the grease in the grease injection channel 151 warm. When grease is injected again, the grease pumped out from the micro-quantitative valve 11 will push the grease in the channel to enter the needle roller bearing 2 first, reducing the waiting time for grease heating and improving efficiency. When grease is injected into needle roller bearings 2 with different inner diameters, the parts can be replaced simply by changing the grease injection head 17, which can quickly adapt to needle roller bearings 2 of different specifications. In summary, this device, by incorporating a heatable oil guide shaft 15, heats the grease used for grease injection into the needle roller bearing 2 within the channel, reducing the viscosity of the grease and improving its fluidity. This ensures a stable and uniform supply of grease to the needle roller bearing 2, avoiding the problems of rapid heat loss and difficulty in maintaining the temperature during the transfer process of existing devices, which leads to a rebound in grease viscosity and poor fluidity upon reaching the grease injection station, resulting in unstable grease injection effects. By setting a temperature control unit 162, the temperature control range of the heating coil 161 is adjustable within 50-100℃, which can quickly melt high-temperature grease and achieve constant temperature and pressure, matching the mass production rhythm of the bearing assembly line and effectively improving the overall production capacity of the production line. The centrifugal high-speed rotation of the bearing is achieved by driving the rotating unit 5. Combined with the flow characteristics of high-temperature grease, the grease spreading effect is enhanced in two ways, ensuring uniform grease injection inside the bearing and eliminating problems such as local grease deficiency and grease accumulation. By incorporating a micro-quantitative valve 11, precise quantitative grease injection of 0.1-0.3g / time is achieved with controllable error. The grease injection head 17 adopts a quick-connect replaceable thread design, which can be quickly adapted to the grease injection port of different specifications of needle roller bearings 2. The grease injection pressure can be flexibly adjusted according to the bearing size, effectively preventing excessive pressure from damaging the bearing cage. It is compatible with the entire series of stamped outer ring needle roller bearings 2. Only the grease injection head 17 and the collet 3 need to be replaced to quickly complete the production specification switch. It can adapt to the flexible production needs of multiple varieties, small batches and large batches, and has high changeover efficiency.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-temperature grease heating and grease injection device for stamped outer ring needle roller bearings, characterized in that: The device includes a grease injection unit (1), which has a micro-quantitative valve (11) and a grease injection head (17) inserted inside the needle roller bearing (2). The micro-quantitative valve (11) is located on top of the grease injection head (17) and is interconnected. The grease injection head (17) has a grease outlet hole (174) in the radial direction. The grease flowing out of the grease outlet hole (174) covers the area of ​​the needle roller bearing (2) that needs to be greased in the circumferential direction. The collet (3) is used to clamp and fix the outer ring of the needle roller bearing (2); The rotating unit (5) drives the chuck (3) to rotate so as to drive the needle roller bearing (2) to rotate circumferentially; There is a heating ring (16) between the micro-quantitative valve (11) and the grease injection head (17) to heat the grease. The heating ring (16) is close to the grease injection head (17). The heating ring (16) keeps the grease flowing into the grease injection head (17) at a constant temperature. With the rotation of the chuck (3), the stable grease is evenly spread in the needle roller bearing (2) under the dual action of centrifugal force and high temperature grease.

2. The high-temperature grease heating and grease injection device for stamped outer ring needle roller bearings according to claim 1, characterized in that: The grease injection unit (1) also includes a transition mounting plate (12) with a transition channel (121) and an oil guide shaft (15) with a grease injection channel (151). The grease flows from the micro-quantitative valve (11) through the transition channel (121) and the grease injection channel (151) in sequence, and flows out from the grease injection head (17). There is an upper sealing ring (18) between the transition mounting plate (12) and the oil guide shaft (15). The upper end of the upper sealing ring (18) abuts against the bottom of the transition mounting plate (12) and the lower end abuts against the top of the oil guide shaft (15). The upper sealing ring (18) surrounds the grease injection channel (151). The heating ring (16) is fixedly connected to the oil guide shaft (15). A heating coil (161) is nested circumferentially on the inner peripheral wall of the heating ring (16), and the inner peripheral wall of the heating coil (161) is in contact with the outer peripheral wall of the oil guide shaft (15).

3. The high-temperature grease heating and grease injection device for stamped outer ring needle roller bearings according to claim 2, characterized in that: The bottom of the heating coil (161) is flush with the bottom of the oil guide shaft (15), and the top of the heating coil (161) is close to the center of the oil guide shaft (15).

4. The high-temperature grease heating and grease injection device for stamped outer ring needle roller bearings according to claim 2, characterized in that: The oil guide shaft (15) is made of stainless steel.

5. The high-temperature grease heating and grease injection device for stamped outer ring needle roller bearings according to claim 4, characterized in that: One end of the heating ring (16) is fixedly connected to a temperature control device (162), and the temperature control device (162) and the heating coil (161) are electrically connected.

6. The high-temperature grease heating and grease injection device for stamped outer ring needle roller bearings according to claim 2, characterized in that: The oil guide shaft (15) extends downward to a connector (152), and the outer wall of the connector (152) is provided with external threads; The grease injection head (17) has a connecting cavity (171) that matches the connector (152). The inner circumferential wall of the connecting cavity (171) has an internal thread, and the connecting cavity (171) and the connector (152) are threaded together. A lower sealing ring (19) is provided between the oil guide shaft (15) and the grease injection head (17). The upper end of the lower sealing ring (19) abuts against the bottom of the oil guide shaft (15), and the lower end abuts against the top of the grease injection head (17).

7. The high-temperature grease heating and grease injection device for stamped outer ring needle roller bearings according to claim 6, characterized in that: The grease injection head (17) is also provided with a connecting transition cavity (172) and an exhaust cavity (173). The exhaust cavity (173) is located below the transition cavity (172), and the exhaust cavity (173) is provided with a plurality of grease outlet holes (174) spaced apart along the circumference.

8. The high-temperature grease heating and grease injection device for stamped outer ring needle roller bearings according to claim 7, characterized in that: The bottom of the grease injection head (17) is a support part (175), the outer diameter of the support part (175) is consistent with the inner diameter of the hollow part (201) of the needle roller bearing (2), and the length is consistent with the height of the needle roller bearing (2). The root of the supporting part (175) forms a stepped surface (176) with the grease injection head (17).

9. The high-temperature grease heating and grease injection device for stamped outer ring needle roller bearings according to claim 8, characterized in that: The grease outlet (174) is configured such that when the grease injection head (17) is inserted into the hollow part (201) of the needle roller bearing (2) and the stepped surface (176) abuts against the upper surface of the needle roller bearing (2), the center of the grease outlet (174) is at the same height as the horizontal center line (202) of the needle roller bearing (2).

10. The high-temperature grease heating and grease injection device for stamped outer ring needle roller bearings according to claim 2, characterized in that: It also includes an electric phenolic resin mounting block (14), a transition mounting plate (12), an oil guide shaft (15), and an electric phenolic resin mounting block (14) which are fixedly connected to each other by bolts (13). One end of the electric phenolic resin mounting block (14) is connected to a lifting unit (4) that drives the grease injection unit (1) to move up and down. The bottom of the chuck (3) has a locking unit (6) to control the locking or loosening of the needle roller bearing (2).

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