High-precision double-row needle bearing with self-detaching plastic sleeve

Abstract

The application discloses a high-precision double-row needle bearing with a plastic sleeve self-falling function, and relates to the technical field of bearings. The needle bearing comprises an inner bushing, a needle, a check ring, a clamping spring, a fixing unit and a plastic sleeve. The plastic sleeve prevents displacement of the needle and invasion of external impurities between the needles, so as to cause pollution and damage to the needle. The fixing unit is responsible for positioning and fixing the clamping spring and the plastic sleeve. During installation of the needle bearing, the clamping spring is always fixed before reaching the specified position, so as to prevent the clamping spring from being expanded and causing scratches on the inner wall of the gear. Meanwhile, during the installation process, the plastic sleeve is gradually and automatically removed along with force movement of the fixing unit, without manual removal.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of bearings, and particularly relates to a high-precision double-row needle bearing with a self-falling plastic sleeve function. BACKGROUND

[0002] When a conventional double-row needle bearing is assembled into a gear, the bearing needs to be manually pressed down, and then the plastic sleeve sleeved on the needle is removed, so that the installation efficiency is low and pollution is easily introduced, thereby damaging the needle bearing and reducing the service life of the needle bearing. Meanwhile, when the snap spring is no longer sleeved by the plastic sleeve during installation of the conventional double-row needle bearing, the snap spring is expanded and scratches the inner wall surface of the gear, thereby damaging the snap spring and the inner wall surface of the gear, and the stability of the fixed needle bearing is reduced. Therefore, a high-precision double-row needle bearing with a self-falling plastic sleeve function is needed to solve the above problems. SUMMARY

[0003] The application aims to provide a high-precision double-row needle bearing with a self-falling plastic sleeve function to solve the problems in the prior art.

[0004] To achieve the above-mentioned purpose, the application provides the following technical scheme.

[0005] The needle bearing comprises an inner bushing, needles, a retainer, a snap spring, a fixing unit and a plastic sleeve, an upper shaft shoulder and a lower shaft shoulder are arranged on the outer wall surface of the inner bushing, the retainer is sleeved on the inner bushing and located between the upper shaft shoulder and the lower shaft shoulder, the needles are arranged in two rows, one row of the needles is located between the upper shaft shoulder and the upper end surface of the retainer, and the other row of the needles is located between the lower shaft shoulder and the lower end surface of the retainer, the plastic sleeve is sleeved on the needles, the snap spring is arranged in the retainer, the snap spring is clamped with the plastic sleeve, the fixing unit is connected with the plastic sleeve, and the fixing unit is inserted into the retainer and the snap spring.

[0006] The plastic sleeve prevents displacement of the needles and invasion of external impurities between the needles, and causes pollution and damage to the needles, and the fixing unit is responsible for positioning and fixing the snap spring and the plastic sleeve, and always fixes the snap spring before the snap spring reaches the specified position during installation of the needle bearing, thereby preventing the snap spring from being expanded and scratched with the inner wall of the gear. Meanwhile, during the installation process, the plastic sleeve is gradually automatically removed along with force movement of the fixing unit, and manual removal is not needed.

[0007] Further, the retainer is U-shaped, the U-shaped groove of the retainer faces the plastic sleeve, and the snap spring is placed in the U-shaped groove.

[0008] The U-shaped retainer can place the snap spring in the U-shaped groove, optimizes the internal structure of the needle bearing, and improves the space utilization.

[0009] Further, the stop ring is provided with first through holes and second through holes, the first through holes and the second through holes are both provided with two, the first through holes are located at the upper end of the stop ring, the second through holes are located at the lower end of the stop ring, two adjacent rolling needles and the plastic sleeve form a gap, two first through holes are located in two adjacent gaps, and two second through holes and two first through holes are axially coincident.

[0010] Part of the fixing unit is inserted into the first through hole after passing through the first through hole, so that the fixing of the snap spring is realized, and the upper half of the plastic sleeve is fixed; another part of the fixing unit is inserted into the second through hole, so that the lower half of the plastic sleeve is fixed; the first through hole and the second through hole are both provided with two, so as to realize the overall fixing of the plastic sleeve on the rolling needle.

[0011] Further, the snap spring is provided with two third through holes, the two third through holes are located at the two ends of the snap spring respectively, and the two third through holes and the two first through holes are axially coincident.

[0012] After the snap spring is clamped on the rolling needle, the two third through holes and the two first through holes are axially coincident, the fixing unit is inserted into the third through hole after passing through the first through hole, the snap spring is fixed and locked, and it is ensured that the snap spring will not be completely expanded after losing the restraint of the plastic sleeve, so as to avoid that the snap spring scratches the inner wall of the gear after the plastic sleeve falls off.

[0013] Further, the fixing unit comprises a first fixing module and a second fixing module, the first fixing module is fixedly connected with the inner circle of the plastic sleeve, the first fixing module is inserted into the two third through holes through the two first through holes, and the second fixing module is slidably connected with the plastic sleeve.

[0014] The first fixing module and the second fixing module act simultaneously, are responsible for fixing the plastic sleeve, and prevent the plastic sleeve from being scattered; the first fixing module fixes the snap spring while fixing the plastic sleeve, and the snap spring is always fixed to prevent the snap spring from being expanded and scratching the inner wall of the gear before the snap spring reaches the specified position during installation.

[0015] Further, the first fixing module comprises a first fixing seat, a first bolt rod, a second fixing seat and a second bolt rod, the first fixing seat is fixedly connected with the inner wall surface of the plastic sleeve, the first bolt rod is slidably connected with the first fixing seat, the first bolt rod passes through one first through hole and is inserted into a third through hole axially coincident with the one first through hole, the second fixing seat is fixedly connected with the inner wall surface of the plastic sleeve, the second bolt rod is slidably connected with the second fixing seat, and the second bolt rod passes through the other first through hole and is inserted into a third through hole axially coincident with the other first through hole.

[0016] The first fixed seat and the second fixed seat are provided with sliding grooves, the first bolt rod and the second bolt rod are respectively arranged in the sliding grooves in the first fixed seat and the second fixed seat, and are respectively in sliding connection with the first fixed seat and the second fixed seat; the length of the sliding grooves is such that when the plastic sleeve is jacked to a preset distance, the first bolt rod and the second bolt rod are first pulled out of the third through hole, the circlip is opened, is fixed in the groove on the inner wall of the gear, and is then pulled out of the first through hole, so that the plastic sleeve is completely removed.

[0017] Further, the second fixed module comprises a first sliding rod, a first blocking rod, a second sliding rod and a second blocking rod, the first sliding rod is inserted into the plastic sleeve from the bottom end of the plastic sleeve and is in sliding connection with the plastic sleeve, the first blocking rod is inserted into the plastic sleeve and is in sliding connection with the plastic sleeve, the bottom end surface of the end of the first blocking rod inserted into the plastic sleeve is in communication with the upper end surface of the end of the first sliding rod inserted into the plastic sleeve, and the first blocking rod is inserted into one second through hole, the second sliding rod is inserted into the plastic sleeve from the bottom end of the plastic sleeve and is in sliding connection with the plastic sleeve, the second blocking rod is inserted into the plastic sleeve and is in sliding connection with the plastic sleeve, the bottom end surface of the end of the second blocking rod inserted into the plastic sleeve is in communication with the upper end surface of the end of the second sliding rod inserted into the plastic sleeve, and the second blocking rod is inserted into another second through hole.

[0018] When the needle bearing is installed, the bottom ends of the first sliding rod and the second sliding rod first contact the upper end surface of the gear, and as the needle bearing is continuously pressed down, the first sliding rod and the second sliding rod are jacked up and slide in the plastic sleeve; as the bottom end surface of the end of the second blocking rod inserted into the plastic sleeve is in communication with the upper end surface of the end of the second sliding rod inserted into the plastic sleeve, and the communicated channel is a sealed channel, as the first sliding rod and the second sliding rod slide upwards, the first blocking rod and the second blocking rod are pressed down by the gas in the sealed channel, so that the first blocking rod and the second blocking rod are gradually pulled out of the second through hole, and part of the plastic sleeve is self-removed.

[0019] Further, the plastic sleeve comprises an upper sleeve and a lower sleeve, the lower end surface of the upper sleeve is an inclined surface, the inclination direction of the inclined surface is inclined from the outer wall surface to the inner wall surface of the upper sleeve, the upper sleeve is sleeved on the needle above the circlip and the retainer, the upper end surface of the lower sleeve is an inclined surface, the inclination direction of the inclined surface is inclined from the inner wall surface to the outer wall surface of the lower sleeve, the lower sleeve is sleeved on the needle below the circlip and the retainer, the upper sleeve and the lower sleeve are in close contact at the inclined surfaces, and the upper sleeve and the lower sleeve are both in clamping connection with the circlip.

[0020] The circlip fixes the upper sleeve and the lower sleeve at the same time, prevents the upper sleeve and the lower sleeve from sliding, and fails to protect the needle; when the needle bearing is installed, the lower sleeve is jacked up along the inclined surface of the upper sleeve and is self-removed without manual operation; after the lower sleeve is removed, the upper sleeve remains in the original position, preventing the needle above the retainer from being scattered.

[0021] Further, the upper sleeve comprises a first side sleeve, a second side sleeve, a spring and a spring plate, one end of the first side sleeve and the second side sleeve are hinged, the first side sleeve and the first fixed seat are fixedly connected, the second side sleeve and the second fixed seat are fixedly connected, a hole is arranged on the end face of the other end of the second side sleeve, the spring is located in the hole, one end of the spring is fixedly connected with the hole, the other end of the spring is fixedly connected with the spring plate, the lower end faces of the first side sleeve and the second side sleeve are inclined surfaces, the inclination directions of the inclined surfaces are from the outer wall to the inner wall, and the inclination angles are consistent, and the first side sleeve and the second side sleeve are clamped with the clamping spring.

[0022] The first side sleeve, the second side sleeve, the spring and the spring plate are fixed through the first fixed module, so that the upper sleeve is a complete cylindrical sleeve, and the spring is in a compressed state at this time; when the lower sleeve is detached, the bottom end of the upper sleeve is jacked up, the upper sleeve starts to slide upwards, and after sliding to a preset height, the first fixed seat and the second fixed seat pull the first bolt rod and the second bolt rod respectively, the first bolt rod and the second bolt rod are pulled out from the third through hole and the first through hole in turn, the clamping spring is opened, the upper sleeve is unlocked, the spring rebounds, the spring plate is opened, and under the pushing force of the spring plate, the first side sleeve and the second side sleeve are pushed to both sides, so that the upper sleeve is automatically detached.

[0023] Further, the lower sleeve comprises a third side sleeve and a fourth side sleeve, one end of the third side sleeve and the fourth side sleeve are hinged, the first sliding rod is inserted into the bottom end of the third side sleeve and is in sliding connection with the third side sleeve, the first blocking rod is inserted into the third side sleeve and is in sliding connection with the third side sleeve, the bottom end face of one end of the third side sleeve and the upper end face of one end of the first sliding rod inserted into the third side sleeve are communicated, the second sliding rod is inserted into the bottom end of the fourth side sleeve and is in sliding connection with the fourth side sleeve, the second blocking rod is inserted into the fourth side sleeve and is in sliding connection with the fourth side sleeve, the bottom end face of one end of the fourth side sleeve and the upper end face of one end of the second sliding rod inserted into the fourth side sleeve are communicated, the lower end faces of the third side sleeve and the fourth side sleeve are inclined surfaces, the inclination directions of the inclined surfaces are from the inner wall to the outer wall, and the inclination angles are consistent, and the third side sleeve and the fourth side sleeve are clamped with the clamping spring.

[0024] The third side sleeve and the fourth side sleeve are fixed through the second fixed module, so that the lower sleeve is a complete cylindrical sleeve, and after the second fixed module is pulled out from the second through hole, the third side sleeve and the fourth side sleeve are jacked up, due to the characteristic inclination directions between the upper end inclined surfaces of the third side sleeve and the fourth side sleeve and the lower end inclined surfaces of the first side sleeve and the second side sleeve, the third side sleeve and the fourth side sleeve are separated by the inclined surfaces of the lower ends of the first side sleeve and the second side sleeve, and the detachment is completed.

[0025] Compared with the prior art, the beneficial effects of the present application are:

[0026] 1、The plastic sleeve is divided into upper sleeve and lower sleeve, through the self-shedding of the lower sleeve and the upper sleeve in sequence, it ensures that the circlip is sent to the designated position, and the upper sleeve can always protect the needle roller above the retainer ring, so that the needle roller is prevented from scattering and causing installation failure;

[0027] 2、The fixing unit is arranged, the plastic sleeve is fixed, and the circlip can be expanded at the predetermined position in the gear, so that the circlip is prevented from being scratched with the inner wall of the gear during installation;

[0028] 3、The specific inclination direction is arranged between the inclined surface of the lower end surface of the upper sleeve and the inclined surface of the upper end surface of the lower sleeve, the specific inclination direction ensures that the lower end inclined surface of the upper sleeve can cut the lower sleeve when the lower sleeve is lifted by the gear, and the lower sleeve is shed. DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall appearance structure of the application;

[0030] Figure 2 It is a schematic diagram of the structure of the application without the plastic sleeve and the fixing unit;

[0031] Figure 3 It is a schematic diagram of an axial cross-sectional structure of the application;

[0032] Figure 4 It is a schematic diagram of another axial cross-sectional structure of the application;

[0033] Figure 5 It is a schematic diagram of a horizontal cross-sectional structure of the application;

[0034] Figure 6 It is a schematic diagram of the upper sleeve structure of the application;

[0035] Figure 7 It is a schematic diagram of the lower sleeve structure of the application;

[0036] Figure 8 It is Figure 5 the enlarged schematic diagram of part A;

[0037] Figure 9 It is a schematic diagram of the circlip of the application;

[0038] Figure 10 It is a schematic diagram of the retainer ring of the application;

[0039] Figure 11 It is Figure 6 the enlarged schematic diagram of part B.

[0040] In the diagram: 1. Inner bushing; 2. Needle roller; 3. Retaining ring; 4. Snap ring; 5. Fixing unit; 6. Plastic sleeve; 11. Upper shaft shoulder; 12. Lower shaft shoulder; 31. First through hole; 32. Second through hole; 41. Third through hole; 51. First fixing module; 52. Second fixing module; 53. First fixing seat; 54. First pin; 55. Second fixing seat; 56. Second pin; 57. First slide rod; 58. First blocking rod; 59. Second slide rod; 510. Second blocking rod; 61. Upper sleeve; 62. Lower sleeve; 63. First side sleeve; 64. Second side sleeve; 65. Spring; 66. Spring plate; 67. Hole; 68. Third side sleeve; 69. Fourth side sleeve. Detailed Implementation

[0041] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0042] Example: Figure 1 - Figure 11 As shown, this invention provides a high-precision double-row needle roller bearing with a self-detaching plastic sleeve function:

[0043] like Figure 1 and Figure 2 As shown, the needle roller bearing includes an inner bushing 1, needle rollers 2, a retaining ring 3, a snap ring 4, a fixing unit 5, and a plastic sleeve 6. The outer wall surface of the inner bushing 1 is provided with an upper shaft shoulder 11 and a lower shaft shoulder 12. The retaining ring 3 is sleeved on the inner bushing 1 and located between the upper shaft shoulder 11 and the lower shaft shoulder 12. The needle rollers 2 are arranged in two rows. One row of needle rollers 2 is located between the upper shaft shoulder 11 and the upper end face of the retaining ring 3, and the other row of needle rollers 2 is located between the lower shaft shoulder 12 and the lower end face of the retaining ring 3. The plastic sleeve 6 is sleeved on the needle rollers 2. The snap ring 4 is disposed inside the retaining ring 3 and is engaged with the plastic sleeve 6. The fixing unit 5 is connected to the plastic sleeve 6 and is inserted into the retaining ring 3 and the snap ring 4.

[0044] The plastic sleeve 6 prevents the needle rollers 2 from shifting and external impurities from entering between the needle rollers 2, thus preventing contamination and damage. The fixing unit 5 is responsible for positioning and fixing the retaining circlip 4 and the plastic sleeve 6. During the installation of the needle roller bearing, the retaining circlip 4 is fixed until it reaches the designated position, preventing it from spreading and scraping against the inner wall of the gear. At the same time, during the installation process, as the fixing unit 5 moves under force, the plastic sleeve 6 gradually and automatically falls off, without the need for manual removal.

[0045] like Figure 2 and Figure 10 As shown, the retaining ring 3 is U-shaped, with the U-shaped groove of the retaining ring 3 facing the plastic sleeve 6, and the retaining spring 4 is placed in the U-shaped groove.

[0046] The U-shaped check ring 3 can place the snap spring 4 in the U-shaped groove, optimize the internal structure of the needle roller bearing, and improve the space utilization.

[0047] As shown in Figure 3 , Figure 4 and Figure 10 , the check ring 3 is provided with first through holes 31 and second through holes 32, both of which are provided with two, the first through hole 31 is located at the upper end of the check ring 3, and the second through hole 32 is located at the lower end of the check ring 3, two adjacent needle rollers 2 and plastic sleeves 6 form a gap, two first through holes 31 are located in adjacent two gaps, and two second through holes 32 and two first through holes 31 coincide in the axial direction.

[0048] After part of the fixing unit 5 passes through the first through hole 31 and inserts the snap spring 4, the snap spring 4 is fixed, and the upper half of the plastic sleeve 6 is fixed at the same time; the other part of the fixing unit 5 is inserted into the second through hole 32 to fix the lower half of the plastic sleeve 6; the first through hole 31 and the second through hole 32 are both provided with two, which are used to realize the overall fixing of the plastic sleeve 6 on the needle roller 2.

[0049] As shown in Figure 3 , Figure 4 and Figure 9 , the snap spring 4 is provided with two third through holes 41, and the two third through holes 41 are respectively located at the two ends of the snap spring 4, and the two third through holes 41 and the two first through holes 31 coincide in the axial direction.

[0050] After the snap spring 4 is clamped on the needle roller 2, the two third through holes 41 and the two first through holes 31 coincide in the axial direction, the fixing unit 5 passes through the first through hole 31 and is inserted into the third through hole 41, the snap spring 4 is fixed and locked, and the snap spring 4 is prevented from being completely stretched after losing the restraint of the plastic sleeve 6, avoiding the scratch between the snap spring 4 and the inner wall of the gear after the plastic sleeve 6 falls off.

[0051] As shown in Figure 6 , Figure 7 and Figure 11 , the fixing unit 5 includes a first fixing module 51 and a second fixing module 52, the first fixing module 51 and the inner ring of the plastic sleeve 6 are fixedly connected, the first fixing module 51 passes through two first through holes 31 and is inserted into two third through holes 41, and the second fixing module 52 and the plastic sleeve 6 are slidably connected, and the second fixing module 52 is inserted into the second through hole 32 from the lower end of the second through hole 32.

[0052] The first fixing module 51 and the second fixing module 52 act simultaneously, and are responsible for fixing the plastic sleeve 6 to prevent the plastic sleeve 6 from being scattered; the first fixing module 51 fixes the plastic sleeve 6 at the same time, and fixes the snap spring 4 before the snap spring 4 reaches the specified position, so that the snap spring 4 is always fixed to prevent the snap spring 4 from being expanded and scratching the inner wall of the gear.

[0053] As shown in Figure 3 , Figure 4 and Figure 11 , the first fixing module 51 includes a first fixing seat 53, a first bolt rod 54, a second fixing seat 55 and a second bolt rod 56, the first fixing seat 53 is fixedly connected with the inner wall surface of the plastic sleeve 6, the first bolt rod 54 is slidably connected with the first fixing seat 53, the first bolt rod 54 passes through a first through hole 31 and is inserted into a third through hole 41 which is axially coincident with the first through hole 31, the second fixing seat 55 is fixedly connected with the inner wall surface of the plastic sleeve 6, the second bolt rod 56 is slidably connected with the second fixing seat 55, and the second bolt rod 56 passes through another first through hole 31 and is inserted into another third through hole 41 which is axially coincident with the first through hole 31.

[0054] The first fixing seat 53 and the second fixing seat 55 are provided with sliding grooves, the first bolt rod 54 and the second bolt rod 56 are respectively arranged in the sliding grooves in the first fixing seat 53 and the second fixing seat 55, and are respectively slidably connected with the first fixing seat 53 and the second fixing seat 55, the length of the sliding grooves is such that when the plastic sleeve 6 is jacked up to a preset distance, the first bolt rod 54 and the second bolt rod 56 are first pulled out of the third through hole 41, the snap spring 4 is expanded, is fixed in the groove on the inner wall of the gear, and is then pulled out of the first through hole 31, so that the plastic sleeve 6 is completely removed.

[0055] As shown in Figure 3 , Figure 4 and Figure 7 , the second fixing module 52 includes a first sliding rod 57, a first plug rod 58, a second sliding rod 59 and a second plug rod 510, the first sliding rod 57 is inserted into the plastic sleeve 6 from the bottom end of the plastic sleeve 6 and is slidably connected with the plastic sleeve 6, the first plug rod 58 is inserted into the plastic sleeve 6 and is slidably connected with the plastic sleeve 6, the bottom end surface of one end of the first plug rod 58 inserted into the plastic sleeve 6 is in communication with the upper end surface of one end of the first sliding rod 57 inserted into the plastic sleeve 6, the first plug rod 58 is inserted into a second through hole 32, the second sliding rod 59 is inserted into the plastic sleeve 6 from the bottom end of the plastic sleeve 6 and is slidably connected with the plastic sleeve 6, the second plug rod 510 is inserted into the plastic sleeve 6 and is slidably connected with the plastic sleeve 6, the bottom end surface of one end of the second plug rod 510 inserted into the plastic sleeve 6 is in communication with the upper end surface of one end of the second sliding rod 59 inserted into the plastic sleeve 6, and the second plug rod 510 is inserted into another second through hole 32.

[0056] When the needle bearing is installed, the bottom end of the first slide rod 57 and the second slide rod 59 first contact the upper end surface of the gear, and as the needle bearing is continuously pressed down, the first slide rod 57 and the second slide rod 59 are lifted and slide in the plastic sleeve 6. Since the second blocking rod 510 is inserted into the bottom end surface of one end of the plastic sleeve 6 and the upper end surface of the second slide rod 59 inserted into one end of the plastic sleeve 6 is connected, and the connected channel is a sealed channel, as the first slide rod 57 and the second slide rod 59 slide upward, the first blocking rod 58 and the second blocking rod 510 are pressed down by the gas in the sealed channel, causing the first blocking rod 58 and the second blocking rod 510 to gradually pull out of the second through hole 32, and part of the plastic sleeve 6 falls off.

[0057] As shown in Figure 1 , Figure 6 and Figure 7 , the plastic sleeve 6 includes an upper sleeve 61 and a lower sleeve 62. The lower end surface of the upper sleeve 61 is inclined, and the inclination direction is from the outer wall surface to the inner wall surface of the upper sleeve 61. The upper sleeve 61 is sleeved on the needle 2 above the snap spring 4 and the retainer 3. The upper end surface of the lower sleeve 62 is inclined, and the inclination direction is from the inner wall surface to the outer wall surface of the lower sleeve 62. The lower sleeve 62 is sleeved on the needle 2 below the snap spring 4 and the retainer 3. The upper sleeve 61 and the lower sleeve 62 are connected and fitted at the inclined surfaces. The upper sleeve 61 and the lower sleeve 62 are both connected with the snap spring 4.

[0058] The snap spring 4 fixes the upper sleeve 61 and the lower sleeve 62, preventing the upper sleeve 61 and the lower sleeve 62 from sliding and failing to protect the needle. When the needle bearing is installed, as long as the inclination direction of the contact surface of the upper sleeve 61 and the lower sleeve 62 is guaranteed, the lower sleeve 62 will be lifted and will spread out along the inclined surface of the upper sleeve 61 and fall off without manual operation. After the lower sleeve 62 falls off, the upper sleeve 61 still remains in place, preventing the needle 2 above the retainer 3 from spreading out.

[0059] As shown in Figure 6 and Figure 8 , the upper sleeve 61 includes a first side sleeve 63, a second side sleeve 64, a spring 65, and a spring plate 66. One end of the first side sleeve 63 and the second side sleeve 64 is hinged. The first side sleeve 63 is fixedly connected with the first fixed seat 53. The second side sleeve 64 is fixedly connected with the second fixed seat 55. A hole 67 is arranged on the end surface of the other end of the second side sleeve 64. The spring 65 is located in the hole 67. One end of the spring 65 is fixedly connected with the hole 67. The other end of the spring 65 is fixedly connected with the spring plate 66. The lower end surfaces of the first side sleeve 63 and the second side sleeve 64 are both inclined, and the inclination direction is from the outer wall surface to the inner wall surface. The inclination angles are consistent. The first side sleeve 63 and the second side sleeve 64 are both connected with the snap spring 4.

[0060] The first side sleeve 63, the second side sleeve 64, the spring 65 and the elastic plate 66 are fixed by the first fixing module 51, so that the upper sleeve 61 is a complete cylindrical sleeve, and the spring 65 is in a compressed state at this time; when the lower sleeve 62 is removed, the bottom end of the upper sleeve 61 is jacked up, the upper sleeve 61 starts to slide upwards, and after sliding to a preset height, the first fixed seat 53 and the second fixed seat 55 pull the first bolt rod 54 and the second bolt rod 56 respectively, the first bolt rod 54 and the second bolt rod 56 are pulled out from the third through hole 41 and the first through hole 31 in turn, the circlip 4 is opened, the upper sleeve 61 is unlocked, the spring 65 rebounds, the elastic plate 66 is opened, and under the pushing force of the elastic plate 66, the first side sleeve 63 and the second side sleeve 64 are pushed to both sides, so that the upper sleeve 61 is removed automatically.

[0061] As shown in Figure 7 The lower sleeve 62 includes a third side sleeve 68 and a fourth side sleeve 69, one end of the third side sleeve 68 and the fourth side sleeve 69 is hinged, the first slide rod 57 is inserted into the third side sleeve 68 from the bottom end of the third side sleeve 68 and is in sliding connection with the third side sleeve 68, the first plug rod 58 is inserted into the third side sleeve 68 and is in sliding connection with the third side sleeve 68, the bottom end surface of one end of the third side sleeve 68 into which the first plug rod 58 is inserted and the upper end surface of one end of the third side sleeve 68 into which the first slide rod 57 is inserted are communicated, the second slide rod 59 is inserted into the fourth side sleeve 69 from the bottom end of the fourth side sleeve 69 and is in sliding connection with the fourth side sleeve 69, the second plug rod 510 is inserted into the fourth side sleeve 69 and is in sliding connection with the fourth side sleeve 69, the bottom end surface of one end of the fourth side sleeve 69 into which the second plug rod 510 is inserted and the upper end surface of one end of the fourth side sleeve 69 into which the second slide rod 59 is inserted are communicated, the lower end surfaces of the third side sleeve 68 and the fourth side sleeve 69 are inclined surfaces, the inclined directions of the inclined surfaces are from the inner wall surface to the outer wall surface, and the inclined angles are consistent, and the third side sleeve 68 and the fourth side sleeve 69 are clamped with the circlip 4.

[0062] The third side sleeve 68 and the fourth side sleeve 69 are fixed by the second fixing module 52, so that the lower sleeve 62 is a complete cylindrical sleeve, after the second fixing module 52 is pulled out from the second through hole 32, the third side sleeve 68 and the fourth side sleeve 69 are jacked up, due to the characteristic inclined directions between the upper end inclined surfaces of the third side sleeve 68 and the fourth side sleeve 69 and the lower end inclined surfaces of the first side sleeve 63 and the second side sleeve 64, the third side sleeve 68 and the fourth side sleeve 69 are opened by the lower end inclined surfaces of the first side sleeve 63 and the second side sleeve 64, and the removal is completed.

[0063] The working principle of the application is that the plastic sleeve 6 prevents displacement of the needle roller 2 and invasion of external impurities between the needle rollers 2, causes pollution and damage to the needle rollers, the fixing unit 5 is responsible for positioning and fixing the circlip 4 and the plastic sleeve 6, and the circlip 4 is always fixed before reaching the specified position during installation of the needle bearing, so that the circlip 4 is prevented from being opened and scratching the inner wall of the gear. Meanwhile, during the installation process, the plastic sleeve 6 is gradually and automatically removed with force movement of the fixing unit 5, without manual removal.

[0064] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that modifications can be made to the technical solutions described in the foregoing embodiments, or some of the technical features thereof can be replaced by equivalent features. Any modifications, equivalent replacements, improvements, and the like made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A high-precision double-row needle bearing with a plastic sleeve self-shedding function, characterized in that: The needle bearing comprises an inner bushing (1), a needle (2), a retainer (3), a circlip (4), a fixing unit (5) and a plastic sleeve (6), an upper shaft shoulder (11) and a lower shaft shoulder (12) are arranged on the outer wall surface of the inner bushing (1), the retainer (3) is sleeved on the inner bushing (1) and located between the upper shaft shoulder (11) and the lower shaft shoulder (12), the needle (2) is provided with double rows, one row of the needle (2) is located between the upper end surface of the upper shaft shoulder (11) and the retainer (3), and the other row of the needle (2) is located between the lower end surface of the lower shaft shoulder (12) and the retainer (3), and the plastic sleeve (6) is sleeved on the needle (2); A U-shaped groove is arranged on the retainer (3) and faces the plastic sleeve (6), the circlip (4) is arranged in the U-shaped groove and is clamped with the plastic sleeve (6); Two first through holes (31) are arranged on the upper end of the retainer (3), and two second through holes (32) are arranged on the lower end of the retainer (3); One third through hole (41) is arranged at each end of the circlip (4), and the first through hole (31), the second through hole (32) and the third through hole (41) coincide in the axial direction; The plastic sleeve (6) comprises an upper sleeve (61) and a lower sleeve (62), the lower end surface of the upper sleeve (61) is inclined, the inclined direction is inclined from the outer wall surface to the inner wall surface of the upper sleeve (61), the upper end surface of the lower sleeve (62) is inclined, and the upper sleeve (61) and the lower sleeve (62) are connected and fitted at the inclined surfaces; The upper sleeve (61) comprises a first side sleeve (63), a second side sleeve (64), a spring (65) and a spring plate (66), one end of the first side sleeve (63) and the second side sleeve (64) is hinged, and the spring plate (66) is connected to the other end of the second side sleeve (64) through the spring (65); The lower sleeve (62) comprises a third side sleeve (68) and a fourth side sleeve (69), one end of the third side sleeve (68) and the fourth side sleeve (69) is hinged; The fixing unit (5) comprises a first fixing module (51) and a second fixing module (52); The first fixing module (51) comprises two fixing seats and two bolt rods, the two fixing seats are fixedly connected to the first side sleeve (63) and the second side sleeve (64) respectively, the two bolt rods are slidably connected to the two fixing seats respectively, the two bolt rods are inserted into one first through hole (31) and a third through hole (41) axially coinciding with the corresponding first through hole (31) respectively, The second fixed module (52) comprises two slide rods and two blocking rods, the two slide rods are respectively inserted into the third side sleeve (68) and the fourth side sleeve (69) from the bottom ends of the third side sleeve (68) and the fourth side sleeve (69) and are in sliding connection with the third side sleeve (68) and the fourth side sleeve (69), the two blocking rods are respectively inserted into the third side sleeve (68) and the fourth side sleeve (69) and are in sliding connection with the third side sleeve (68) and the fourth side sleeve (69), the sliding grooves of the slide rods and the blocking rods on the third side sleeve (68) and the fourth side sleeve (69) are in communication, the sliding grooves of the slide rods and the blocking rods are in sealing arrangement, and the slide rods drive the blocking rods to slide in the direction opposite to the sliding direction of the slide rods.

2. The high-precision double-row needle bearing with a plastic sleeve self- shedding function according to claim 1, characterized in that: Two adjacent rolling needles (2) and plastic sleeves (6) form a gap, and two first through holes (31) are located in two adjacent gaps.

3. The high-precision double-row needle bearing with a plastic sleeve self- shedding function according to claim 1, characterized in that: The upper sleeve (61) is sleeved on the rolling needle (2) above the snap spring (4) and the check ring (3), and the lower sleeve (62) is sleeved on the rolling needle (2) below the snap spring (4) and the check ring (3).

4. The high-precision double-row needle bearing with a plastic sleeve self- shedding function according to claim 1, characterized in that: A hole (67) is arranged on the end face of the other end of the second side sleeve (64), the spring (65) is located in the hole (67), one end of the spring (65) is fixedly connected with the hole (67), the other end of the spring (65) is fixedly connected with the elastic plate (66), the lower end faces of the first side sleeve (63) and the second side sleeve (64) are inclined surfaces, the inclined directions of the inclined surfaces are from the outer wall faces to the inner wall faces, the inclined angles of the inclined surfaces are consistent, and the first side sleeve (63) and the second side sleeve (64) are clamped with the snap spring (4).

5. The high-precision double-row needle bearing with a plastic sleeve self- shedding function according to claim 1, characterized in that: The lower end faces of the third side sleeve (68) and the fourth side sleeve (69) are inclined surfaces, the inclined directions of the inclined surfaces are from the inner wall faces to the outer wall faces, the inclined angles of the inclined surfaces are consistent, and the third side sleeve (68) and the fourth side sleeve (69) are clamped with the snap spring (4).

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