CN201487042U - Ball-type rotating support for asymmetrical raceways - Google Patents
Ball-type rotating support for asymmetrical raceways Download PDFInfo
- Publication number
- CN201487042U CN201487042U CN2009201722118U CN200920172211U CN201487042U CN 201487042 U CN201487042 U CN 201487042U CN 2009201722118 U CN2009201722118 U CN 2009201722118U CN 200920172211 U CN200920172211 U CN 200920172211U CN 201487042 U CN201487042 U CN 201487042U
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- raceway
- raceways
- asymmetrical
- ball
- rotating support
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Abstract
The utility model discloses a ball-type rotating support for asymmetrical raceways. The raceways of the rotating support are the asymmetrical raceways; the upper parts and the lower parts of the raceways are asymmetrical; and an inner raceway and an outer raceway are asymmetrical. The ball-type rotating support has the concrete structural parameters as follows: the curvature ratio K (the ratio of the curvature radius of the raceways to that of a steel ball, R/r) ranges from 1.02 to 1.08; a contact angle Alpha ranges from 55 degrees to 65 degrees; and a crossing angle Beta ranges from 10 degrees to 20 degrees. According to the concrete structural parameters, firstly, the semi-finishing machining of the raceways is carried out by adopting a numerically controlled lathe; then the raceway quenching adopts medium-frequency induction quenching, and the quenching hardness ranges from 57 to 62 HRC; and finally, the form grinding of the asymmetrical raceways is carried out by using a numerically controlled dedicated grinding machine for the raceways. The rotating support can improve the state of the contact stress of the steel ball and the raceways, and the carrying capacity can be increased by 35 percent.
Description
Technical field
The utility model relates to a kind of ball-type slewing bearing that improves structure.
Background technique
The raceway pattern of now general single-row ball type slewing bearing and the supporting of eight point contact ball slewings be two circular arcs pair centers of circle, R/r＞1, raceway symmetry (seeing accompanying drawing 1) up and down, Internal and external cycle raceway symmetry.Raceway quenching hardness, depth of hardening zone, raceway radius of curvature and wrapping angle are to influence the bearing capacity of peach shape raceway pivoting support and four important parameters in working life.The raceway quenching hardness is subjected to the restriction of steel ball surface hardness can only be 55～62HRC, and is limited from the effect of this respect raising bearing capacity; As long as depth of hardening zone is deepened depth of hardening zone except meeting improves the quenching cost greater than specified value, can not aspect the raising bearing capacity big effect arranged; Wrapping angle is crossed the possibility that conference increases raceway limit mouth conquassation in existing raceway pattern, also should not improve the bearing capacity of pivoting support by the method that increases wrapping angle; The ratio of raceway radius of curvature and steel ball radius is generally 1.04～1.08, and the more little bearing capacity of ratio is big more, but the control difficulty of the more little raceway accuracy to shape of ratio is big more.Under the existing processes condition, can not improve the bearing capacity of pivoting support by the method that reduces the raceway ratio of curvature.
Summary of the invention
The purpose of this utility model is a kind of ball-type slewing bearing that can improve the raceway bearing capacity.
The utility model changes the symmetrical raceway pattern of ball-type slewing bearing into the asymmetrical type raceway, and raceway is asymmetric up and down, and the Internal and external cycle raceway is asymmetric.The structure shape of asymmetric raceway as shown in Figure 2.
Among the figure:
R---steel ball radius of curvature;
R---raceway radius of curvature;
The wrapping angle of α---steel ball and raceway;
β---the angle of cut of raceway central cross-section and horizontal section.
The concrete structure parameter of asymmetric raceway is as follows:
Ratio of curvature K (ratio of raceway and steel ball radius of curvature, span R/r) is: 1.02～1.08, wrapping angle α span is 55 °～65 °, angle of cut β span is 10 °～20 °.
The processing method of the ball-type slewing bearing of above-mentioned asymmetric raceway is as follows:
(1), adopt numerically controlled lathe that raceway is carried out semi finishing according to the concrete structure parameter of asymmetric raceway;
(2) raceway quenches and adopts mid-frequency induction hardening, and quenching hardness is 57～62HRC;
(3) use the right title raceway of numerical control raceway special purpose grinder and form grinding, perhaps use the hard car raceway of numerically controlled lathe.
Studies show that, make general through ball type raceway into asymmetric raceway, can improve the contact stress state of steel ball and raceway, improve the raceway bearing capacity, and then improve the service behaviour and the life-span of pivoting support.After adopting asymmetric raceway, under the identical situation of raceway radius of curvature, depth of hardening zone, the bearing capacity of pivoting support can improve 35%.
Description of drawings
The raceway structural representation of the existing pivoting support of Fig. 1.
The structural representation of the asymmetric raceway of Fig. 2.
Fig. 3 is the single-row ball type slewing bearing raceway structural representation of asymmetric raceway.
Embodiment
As can be seen from Figure 3, the raceway pattern of single-row ball type slewing bearing is designed to asymmetric raceway.When the raceway parameter value of single-row ball type slewing bearing is: the raceway radius of curvature of steel ball radius of curvature r=9.922mm, point of contact and the ratio t=1.04 of steel ball radius of curvature and wrapping angle α=60 °.
Can get angle of cut β=15 ° of radius of curvature R=10.32mm, raceway central cross-section and the horizontal section of asymmetric raceway.
According to above size, at first be to use numerically controlled lathe to carry out the semi finishing of the asymmetric raceway of this kind.The raceway curve form rule of numerical control turning, low, the raceway limit mouth circular arc chamfering radius unanimity of surface roughness, and with the roller surface smooth connection.The raceway curved surface of rule makes depth of hardening zone evenly become possibility, and " sharp angle effect " the when chamfering of smooth connection has been avoided quenching eradicated the defective of raceway limit mouth easy hardening crack.The asymmetric raceway curved surface of numerical control turning removes rough surface and is outside one's consideration, and the raceway curved surface after all the other sizes and the grinding is in full accord, so the grinding allowance of raceway is very little.
Use the method for Frequency Induction Heating then semi-finished raceway is carried out the surface heat processing, quenching hardness is 57～62HRC, and depth of hardening zone is greater than 3.0mm.
At last the asymmetric raceway after the tempering is formed grinding or adopt with car for mill.The most important thing is grinding wheel dressing in the form grinding, the three-coordinate linkage that utilizes numerical control raceway special purpose grinder can reach good effect by the finishing moulding of program control emery wheel.Avoided tool setting and be similar to finishing and the error of generation from principle, raceway shape and original wrapping angle are effectively guaranteed.The position control accuracy of numerical control raceway special purpose grinder can satisfy the microfeed in the grinding, improves the machining accuracy of raceway.Adopt numerically controlled lathe, pottery or cubic boron nitride cutting tool to carry out the hard car of raceway, can guarantee that raceway shape, surface roughness that turning goes out adhere to specification, can form cold hardened layer in raceway face again and play and improve the pivoting support effect in working life.
Claims (2)
1. the ball-type slewing bearing of an asymmetric raceway is characterized in that changing the symmetrical raceway pattern of ball-type slewing bearing into the asymmetrical type raceway, and raceway is asymmetric up and down, and the Internal and external cycle raceway is asymmetric; The concrete structure parameter of asymmetric raceway is: and ratio of curvature K (ratio of raceway and steel ball radius of curvature, span R/r) is 1.02～1.08, and wrapping angle α span is 55 °～65 °, and angle of cut β span is 10 °～20 °.
2. the ball-type slewing bearing of asymmetric raceway as claimed in claim 1, the quenching hardness that it is characterized in that raceway is 57～62HRC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201722118U CN201487042U (en) | 2009-05-22 | 2009-05-22 | Ball-type rotating support for asymmetrical raceways |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201722118U CN201487042U (en) | 2009-05-22 | 2009-05-22 | Ball-type rotating support for asymmetrical raceways |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201487042U true CN201487042U (en) | 2010-05-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201722118U Expired - Fee Related CN201487042U (en) | 2009-05-22 | 2009-05-22 | Ball-type rotating support for asymmetrical raceways |
Country Status (1)
| Country | Link |
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| CN (1) | CN201487042U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110763091A (en) * | 2019-11-13 | 2020-02-07 | 南京工业大学 | Asymmetric V-shaped groove and double-point unlocking type rigid wrapping belt for interstage linear separation device |
-
2009
- 2009-05-22 CN CN2009201722118U patent/CN201487042U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110763091A (en) * | 2019-11-13 | 2020-02-07 | 南京工业大学 | Asymmetric V-shaped groove and double-point unlocking type rigid wrapping belt for interstage linear separation device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100526 Termination date: 20110522 |