Combined bearing

Abstract

The utility model discloses a combined type bearing which comprises a radial needle bearing and an angular contact ball bearing, the radial needle bearing comprises an outer ring and a needle roller set movably arranged on the inner circumferential wall of the outer ring, the angular contact ball bearing comprises a ferrule and a rolling ball set, a check ring is bent on the side wall of the outer ring, and the check ring is arranged on the inner circumferential wall of the outer ring. Grooves are annularly formed in the outer wall of the check ring and the inner wall of the ferrule, the two grooves are oppositely arranged, the rolling ball set is movably arranged between the two grooves, each rolling ball in the rolling ball set is in two-point angular contact with the corresponding groove, and the contact angle between each rolling ball and the corresponding groove is 35 degrees. A loading piece used for improving the axial load resisting capacity of the radial needle bearing is arranged between the ferrule and the check ring. The radial needle bearing solves the problem that a traditional radial needle bearing is poor in axial load resistance.

Description

TECHNICAL FIELD

[0001] The utility model relates to bearing technical field, concretely is a combined bearing. BACKGROUND

[0002] In the field of mechanical transmission, bearing as the key rotating element, its performance directly affects the stability and life of mechanical equipment. Although the traditional radial needle bearing has high radial bearing capacity, its axial load resistance is relatively weak, which limits its use in high axial load application scenarios to some extent. For example, in the special working condition of size limitation, only the radial needle bearing without inner ring can be installed, and the radial needle bearing needs to bear high axial force and radial force. When the axial force of the bearing is too large, it will cause the bearing temperature rise verification, and then accelerate the bearing fatigue shedding. SUMMARY

[0003] In view of the prior art, the utility model provides a combined bearing to solve the problem of weak axial load resistance of traditional radial needle bearing.

[0004] To achieve the above purpose, the utility model provides a combined bearing, which comprises a radial needle bearing and an angular contact ball bearing, the radial needle bearing comprises an outer ring and a needle roller group movably arranged on the inner wall of the outer ring, the angular contact ball bearing comprises a sleeve ring and a ball group, the outer wall of the retaining ring is provided with a groove on the inner wall of the sleeve ring, the two grooves are oppositely arranged and the ball group is movably arranged between the two grooves, each ball in the ball group is arranged in two-point angular contact with the groove, and the contact angle between the ball and the groove is 35 degrees, and the sleeve ring and the retaining ring are provided with a loading part for improving the axial load resistance of the radial needle bearing.

[0005] The beneficial effects of the above technical solution are: the above technology sets a retainer on the side wall of the outer ring of the centripetal needle bearing, and the retainer cooperates with the ring of the angular contact ball bearing to form a movable cavity for the ball group, and each ball in the ball group is in two-point angular contact with the groove, that is, each ball is in four-point angular contact with two grooves, and the contact points of the ball and the groove have a certain angle with the center line of the groove. The four-point angular contact arrangement allows the ball to withstand high axial force. The cooperation of the ring and the ball group allows the ring to withstand not only axial force but also radial force. The ring cooperates with the ball group and the retainer to share part of the radial force of the centripetal needle bearing, and at the same time, the ring can withstand the axial impact force applied by the transmission shaft shoulder. The loading element in the above technology further improves the axial load capacity of the centripetal needle bearing to improve the service life and running accuracy of the centripetal needle bearing, and avoids the fatigue and shedding of the bearing due to high axial load and high temperature. The above technology effectively improves the axial load capacity of the centripetal needle bearing, and not only enhances the stability and durability of the bearing in a high axial load environment, but also optimizes the contact angle of the needle and the groove to improve the running accuracy and efficiency of the bearing. In addition, the combined structure of the bearing simplifies the installation and maintenance process of the bearing, reduces the maintenance cost, and has significant economic benefits and market application prospects. The number of balls in the ball group is not limited in the above technology. To improve the axial load capacity of the centripetal needle bearing, the ball can be fully loaded in the groove to further improve the axial load capacity. In the above technology, the outer ring is used to cooperate with the pre-set hole on the outer shell, and the needle group cooperates with the external shaft, that is, the shaft and the outer shell are connected by the centripetal needle bearing, and the retainer is used to cooperate with the transmission shaft shoulder to withstand part of the load.

[0006] The utility model further sets up: the loading piece includes the upper partition ring and lower partition ring of the annular arrangement on the retainer outer wall, the upper partition ring and lower partition ring are divided and establish in the retainer's groove both sides, the upper partition ring outer wall and lower partition ring outer wall all annularly set up limit slot, the ring inner wall is annularly set up with a plurality of limit protrusions to two limit slot directions, a plurality of limit protrusions outer wall all are with the limit slot inner wall clearance cooperation setting of respective corresponding.

[0007] The beneficial effects of the above technical solution are: the above technology sets a retainer on the side wall of the outer ring of the centripetal needle bearing, and the retainer cooperates with the ring of the angular contact ball bearing to form a movable cavity for the ball group, and each ball in the ball group is in two-point angular contact with the groove, that is, each ball is in four-point angular contact with two grooves, and the contact points of the ball and the groove have a certain angle with the center line of the groove. The four-point angular contact arrangement allows the ball to withstand high axial force. The cooperation of the ring and the ball group allows the ring to withstand not only axial force but also radial force. The ring cooperates with the ball group and the retainer to share part of the radial force of the centripetal needle bearing, and at the same time, the ring can withstand the axial impact force applied by the transmission shaft shoulder. The loading element in the above technology further improves the axial load capacity of the centripetal needle bearing to improve the service life and running accuracy of the centripetal needle bearing, and avoids the fatigue and shedding of the bearing due to high axial load and high temperature. The above technology effectively improves the axial load capacity of the centripetal needle bearing, and not only enhances the stability and durability of the bearing in a high axial load environment, but also optimizes the contact angle of the needle and the groove to improve the running accuracy and efficiency of the bearing. In addition, the combined structure of the bearing simplifies the installation and maintenance process of the bearing, reduces the maintenance cost, and has significant economic benefits and market application prospects. The number of balls in the ball group is not limited in the above technology. To improve the axial load capacity of the centripetal needle bearing, the ball can be fully loaded in the groove to further improve the axial load capacity. In the above technology, the outer ring is used to cooperate with the pre-set hole on the outer shell, and the needle group cooperates with the external shaft, that is, the shaft and the outer shell are connected by the centripetal needle bearing, and the retainer is used to cooperate with the transmission shaft shoulder to withstand part of the load.

[0008] The utility model further sets up: the self -adaptation strip is connected between the spacing protrusion and the inner wall of the sleeve ring, the self -adaptation strip is made of shape memory alloy material, the self -adaptation strip is in spiral line setting, the self -adaptation strip initial end is connected with the inner wall of sleeve ring setting, the self -adaptation strip end is connected with the corresponding spacing protrusion end setting, the self -adaptation strip exists first form under the first temperature range, the self -adaptation strip exists second form under the second temperature range, the self -adaptation strip stretches under the first form to make spacing protrusion outer wall and spacing groove inner wall abutment cooperation, the self -adaptation strip contracts under the second form to make spacing protrusion outer wall and spacing groove inner wall clearance cooperation.

[0009] The utility model discloses a beneficial adoption above -mentioned technical scheme has: when bearing operation, bearing temperature will gradually increase, when bearing temperature rises to 30 degrees above, it is first temperature range, when the self -adaptation strip is first form under the first temperature range, the self -adaptation strip stretches under the first form to make spacing protrusion move until spacing protrusion outer wall and spacing groove inner wall abutment cooperation, further when the sleeve ring bears high axial load, spacing protrusion can share part axial load and avoid high axial load to concentrate on the ball group, in this way, avoid the ball group damage and lead to bearing operation failure, simultaneously, avoid too big axial load and lead to stress concentration to cause the influence of bearing outer ring, when bearing stops operation or does not operate, bearing temperature is below 30 degrees, when this temperature range is second temperature range, the self -adaptation strip is second form under the second temperature range, when its contraction drives spacing protrusion outer wall and spacing groove inner wall clearance cooperation, further avoid the influence to bearing initial operation, simultaneously, convenient bearing dismounting, shape memory alloy in above -mentioned technical is prior art, under certain conditions, it can change its shape, and when reaching certain critical temperature, restores to the original shape's characteristic, therefore, do not repeat too much on its principle.

[0010] The utility model discloses a beneficial adoption above -mentioned technical scheme has: spacing protrusion is made of elastic rubber material, under the influence of elastic performance, ensure that spacing protrusion and spacing groove abutment cooperation can improve the abutment intensity between both, simultaneously make spacing protrusion can bear part axial load, further reduce the axial load on the outer ring, further improve the axial load intensity of bearing.

[0011] The utility model discloses a beneficial adoption above -mentioned technical scheme has: spacing protrusion is made of elastic rubber material, under the influence of elastic performance, ensure that spacing protrusion and spacing groove abutment cooperation can improve the abutment intensity between both, simultaneously make spacing protrusion can bear part axial load, further reduce the axial load on the outer ring, further improve the axial load intensity of bearing.

[0012] The utility model discloses a beneficial adoption above -mentioned technical scheme has: spacing protrusion is made of elastic rubber material, under the influence of elastic performance, ensure that spacing protrusion and spacing groove abutment cooperation can improve the abutment intensity between both, simultaneously make spacing protrusion can bear part axial load, further reduce the axial load on the outer ring, further improve the axial load intensity of bearing.

[0013] The beneficial effects of the above technical scheme are that: in the above technology, the supplement oil groove is arranged to place the lubricating grease into the rolling needle group through the supplement oil hole to lubricate the rolling needles in the rolling needle group, so as to improve the operation efficiency and smoothness of the bearing, and the supplement oil groove is arranged to concentrate and store the grease, so as to avoid the influence of too much grease on the operation efficiency of the bearing, and avoid the grease throwing phenomenon of the bearing operation.

[0014] The outer ring is made of GCr15 bearing steel material.

[0015] The beneficial effects of the above technical scheme are that: in the above technology, the outer ring is made of GCr15 bearing steel material, so that the outer ring has a longer service life under the conditions of high load and high speed operation, has good dimensional stability and high contact fatigue strength, which is very important for the long-term performance of precision machinery and bearings. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a partial cross-sectional view of the running state of the utility model;

[0017] Figure 2 It is a partial cross-sectional view of the non-running state of the utility model. DETAILED DESCRIPTION

[0018] The utility model provides a combined bearing, including centripetal needle bearing and angular contact ball bearing, the centripetal needle bearing includes the outer ring 1 and the needle set 11 of the movable setting on the inner wall wall of outer ring 1, angular contact ball bearing includes sleeve ring 2 and the ball group 21, the outer ring 1 side wall is bent and has the baffle ring 12, the baffle ring 12 outer wall and sleeve ring 2 inner wall all are annular and are equipped with the channel 13, two the ball group 21 is movably arranged between two channels 13, every ball of the ball group 21 is with channel 13 two point angular contact setting and the contact angle of ball and channel 13 is 35 degrees, the sleeve ring 2 and the baffle ring 12 between are equipped with the loading piece for improving the axial load capacity of centripetal needle bearing, the loading piece includes the upper partition ring 14 and lower partition ring 15 of annular arrangement on the baffle ring 12 outer wall, the upper partition ring 14 and lower partition ring 15 are divided and are equipped with in the channel 13 both sides of baffle ring 12, the upper partition ring 14 outer wall and lower partition ring 15 outer wall all are annular and are equipped with the limiting groove 16, the sleeve ring 2 inner wall is annular and is equipped with a plurality of limiting protrusions 22 towards two limiting grooves 16, a plurality of limiting protrusions 22 outer wall all are with the clearance fit of each corresponding limiting groove 16 inner wall arrangement, the limiting protrusion 22 and sleeve ring 2 inner wall are connected with the self -adaptation strip 3, the self -adaptation strip 3 is made of shape memory alloy material, the self -adaptation strip 3 is annular and is arranged, the self -adaptation strip 3 initial end and sleeve ring 2 inner wall are connected and are arranged, the self -adaptation strip 3 end and corresponding limiting protrusion 22 end are connected and are arranged, the self -adaptation strip 3 has first form under the first temperature range, the self -adaptation strip 3 has second form under the second temperature range, the self -adaptation strip 3 is stretched under the first form to make limiting protrusion 22 outer wall and limiting groove 16 inner wall abutment fit, the self -adaptation strip 3 is contracted under the second form to make limiting protrusion 22 outer wall and limiting groove 16 inner wall clearance fit, the limiting protrusion 22 is made of elastic rubber material, the outer ring 1 outer wall is annular and is equipped with the oil supplement groove 4, the oil supplement groove 4 radial section is arc-shaped and is arranged, the oil supplement groove 4 bottom wall is communicated to the inner wall wall on outer ring 1 and forms a plurality of oil supplement holes 41, the outer ring 1 is made of GCr15 bearing steel material.

[0019] The above description and the accompanying drawings only show the state of the art, and the specific structure and size of the self-adaptation strip are not limited.

[0020] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above examples. The above examples and descriptions in the specification are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, various changes and improvements can be made to the utility model. These changes and improvements fall within the scope of the claimed utility model. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A combined bearing comprising a radial needle roller bearing and an angular contact ball bearing, characterized in that: The radial needle roller bearing includes an outer ring and a needle roller group movably arranged on the inner circumferential wall of the outer ring. The angular contact ball bearing includes a ferrule and a ball group. A retaining ring is bent on the side wall of the outer ring. A circumferential groove is opened on the outer wall of the retaining ring and the inner wall of the ferrule. The two grooves are arranged opposite to each other and the ball group is movably arranged between the two grooves. Each ball in the ball group is arranged in two-point angular contact with the groove and the contact angle between the ball and the groove is 35 degrees. A loading member for improving the axial load resistance of the radial needle roller bearing is arranged between the ferrule and the retaining ring.

2. A combined bearing according to claim 1, characterized in that: The loading part includes an upper spacer ring and a lower spacer ring arranged circumferentially on the outer wall of the retaining ring, and the upper spacer ring and the lower spacer ring are respectively arranged on both sides of the groove of the retaining ring. The outer wall of the upper spacer ring and the outer wall of the lower spacer ring are both circumferentially provided with limiting grooves, and the inner wall of the ring is circumferentially provided with a plurality of limiting protrusions in the direction of the two limiting grooves, and the outer walls of the plurality of limiting protrusions are clearance-matched with the inner walls of the corresponding limiting grooves.

3. A combined bearing according to claim 2, characterized in that: An adaptive strip is connected between the limiting protrusion and the inner wall of the ring. The adaptive strip is made of shape memory alloy and is arranged in a spiral shape. The starting end of the adaptive strip is connected to the inner wall of the ring, and the end of the adaptive strip is connected to the corresponding end of the limiting protrusion. The adaptive strip has a first form in a first temperature range and a second form in a second temperature range. The adaptive strip is stretched in the first form so that the outer wall of the limiting protrusion abuts and fits with the inner wall of the limiting groove. The adaptive strip is contracted in the second form so that the outer wall of the limiting protrusion and the inner wall of the limiting groove are gap-fitted.

4. A combined bearing according to claim 3, characterized in that: The limiting protrusion is made of elastic rubber material.

5. The combined bearing according to claim 1, characterized in that: An oil supply groove is circumferentially formed on the outer peripheral wall of the outer ring. The radial cross section of the oil supply groove is arc-shaped. The bottom wall of the oil supply groove is connected to the inner peripheral wall of the outer ring and is formed with a plurality of oil supply holes.

6. The combined bearing according to claim 1, characterized in that: The outer ring is made of GCr15 bearing steel.

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