CN113251122A - Differential planetary roller screw - Google Patents
Differential planetary roller screw Download PDFInfo
- Publication number
- CN113251122A CN113251122A CN202011076858.8A CN202011076858A CN113251122A CN 113251122 A CN113251122 A CN 113251122A CN 202011076858 A CN202011076858 A CN 202011076858A CN 113251122 A CN113251122 A CN 113251122A
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- ring gear
- sleeve
- gear ring
- screw
- differential planetary
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H13/00—Gearing for conveying rotary motion with constant gear ratio by friction between rotary members
- F16H13/06—Gearing for conveying rotary motion with constant gear ratio by friction between rotary members with members having orbital motion
- F16H13/08—Gearing for conveying rotary motion with constant gear ratio by friction between rotary members with members having orbital motion with balls or with rollers acting in a similar manner
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention discloses a differential planetary roller screw, which comprises a middle screw, a gear ring, a sleeve, an elastic component and a plurality of roller bodies, wherein the gear ring is coaxially sleeved on the middle screw, the roller bodies are wound between the gear ring and the middle screw, the roller bodies are meshed with the gear ring and the middle screw, the sleeve is sleeved on the middle screw, the elastic component, the gear ring and the roller bodies are positioned in the sleeve, and the elastic component is abutted against the gear ring and applies acting force along the axial direction of the middle screw to the gear ring. The elastic component applies acting force to the gear ring to provide pretightening force, so that pretightening torque is generated, the processing difficulty caused by pretightening of the differential planetary roller screw is reduced, the cost is reduced, and the production efficiency is improved; meanwhile, the size of the pretightening force can be adjusted through the elastic component, and the size of the pretightening force moment can also be adjusted.
Description
Technical Field
The invention relates to a differential planetary roller screw.
Background
Because of the differential effect, the differential planetary roller screw usually needs to be pre-tightened to prevent slipping in order to ensure a certain lead accuracy, thereby improving the lead accuracy. The structure of the differential planetary roller screw adopts a pre-tightening method which is an interference mode at present. The method has high requirements on the dimensional accuracy of all parts, otherwise, proper pre-tightening torque cannot be achieved, and meanwhile, the machining difficulty is high, only machining can be carried out, and parts are difficult to exchange.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a differential planetary roller screw.
The invention is realized by the following technical scheme:
the utility model provides a differential planet roller lead screw, its includes middle lead screw, ring gear, sleeve, elastomeric element and a plurality of cylinder, the coaxial cover of ring gear is located middle lead screw, it is a plurality of the cylinder is all around establishing the ring gear with between the middle lead screw, and a plurality of the cylinder all with the ring gear middle lead screw meshes mutually, sleeve cover is located on the middle lead screw, elastomeric element ring gear and a plurality of the cylinder all is located in the sleeve, just elastomeric element support lean on in the ring gear is right the ring gear is applyed the edge the axial direction's of middle lead screw effort.
Further, the differential planetary roller screw further comprises a retainer, and both ends of the plurality of roller bodies are rotatably connected to the retainer.
Further, the gear ring comprises a first gear ring and a second gear ring, the first gear ring and the second gear ring are both meshed with the plurality of roller bodies, the first gear ring and the second gear ring are arranged at intervals, and the elastic component is abutted against the first gear ring and/or the second gear ring.
Further, the elastic component is located between the first gear ring and the second gear ring, and two ends of the elastic component respectively abut against the first gear ring and the second gear ring.
Further, the sleeve comprises a sleeve body and a sealing part, the end part of the sleeve body is connected with the sealing part and is provided with an accommodating cavity, and the elastic part, the first gear ring, the second gear ring and the plurality of roller bodies are all located in the accommodating cavity.
Further, the elastic component is a wave spring.
Further, the first gear ring is located in the sleeve, the second gear ring is connected to the end of the sleeve, and two ends of the elastic component are respectively abutted to the first gear ring and the sleeve.
Further, the differential planetary roller screw further comprises a snap spring connected to the second gear ring to block the second gear ring from moving in a direction approaching the first gear ring.
Further, the elastic component is a disc spring.
The invention has the beneficial effects that: the elastic component applies acting force to the gear ring to provide pretightening force, so that pretightening torque is generated, the processing difficulty caused by pretightening of the differential planetary roller screw is reduced, the cost is reduced, and the production efficiency is improved; meanwhile, the size of the pretightening force can be adjusted through the elastic component, so that the size of the pretightening force moment can be adjusted, and the pretightening force moment is effectively ensured to meet the requirements of the differential planetary roller screw.
Drawings
Fig. 1 is a schematic view of the internal structure of a differential planetary roller screw according to embodiment 1 of the present invention.
Fig. 2 is an exploded view of the differential planetary roller screw according to embodiment 1 of the present invention.
Fig. 3 is a schematic structural view of the elastic member of the differential planetary roller screw according to embodiment 1 of the present invention.
Fig. 4 is a schematic view of the internal structure of the differential planetary roller screw according to embodiment 2 of the present invention.
Fig. 5 is an exploded view of the differential planetary roller screw according to embodiment 2 of the present invention.
Fig. 6 is a schematic structural view of the elastic member of the differential planetary roller screw according to embodiment 2 of the present invention.
Fig. 7 is a schematic view of the internal structure of the differential planetary roller screw according to embodiment 3 of the present invention.
Fig. 8 is an exploded view of a differential planetary roller screw according to embodiment 3 of the present invention.
Description of reference numerals:
Sealing member 42
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced.
Example 1
As shown in fig. 1, fig. 2 and fig. 3, the present embodiment discloses a differential planetary roller screw, which includes a middle screw 1, a gear ring 3, a sleeve 4, an elastic component 5 and a plurality of roller bodies 2, the middle screw 1 is coaxially sleeved with the gear ring 3, the roller bodies 2 are all wound between the gear ring 3 and the middle screw 1, and the roller bodies 2 are all engaged with the gear ring 3 and the middle screw 1, the sleeve 4 is sleeved on the middle screw 1, the elastic component 5, the gear ring 3 and the roller bodies 2 are all located in the sleeve 4, and the elastic component 5 abuts against the gear ring 3 and applies an acting force along the axial direction of the middle screw 1 to the gear ring 3.
The gear ring 3 comprises a first gear ring 31 and a second gear ring 32, the first gear ring 31 and the second gear ring 32 are both meshed with the plurality of roller bodies 2, the first gear ring 31 and the second gear ring 32 are arranged at intervals, and the elastic component 5 abuts against the first gear ring 31 and/or the second gear ring 32. The first gear ring 31 and the second gear ring 32 in the gear ring 3 are separated and arranged at intervals, and the elastic component 5 abuts against the first gear ring 31 and/or the second gear ring 32, so that tight meshing between the gear ring 3 and the plurality of roller bodies 2 is effectively strengthened, and a pre-tightening force is provided, and a pre-tightening torque is generated. Simple structure, installation preparation is convenient.
In the present embodiment, the first ring gear 31 is located in the sleeve 4, the second ring gear 32 is connected to an end portion of the sleeve 4, and two ends of the elastic component 5 respectively abut against the first ring gear 31 and the sleeve 4. The elastic component 5 directly applies force to the first gear ring 31 to realize tight meshing between the first gear ring 31 and the plurality of roller bodies 2, so that pretightening force is provided for the first gear ring 31; the elastic component 5 directly exerts force on the sleeve 4, and the sleeve 4 is connected with the second gear ring 32, so that the second gear ring 32 is also tightly meshed with the plurality of roller bodies 2, and pretightening force is provided for the second gear ring 32. Meanwhile, the pre-tightening force is adjusted through the relative position of the sleeve 4 and the second gear ring 32, and the adjustment is very convenient.
The sleeve 4, the elastic member 5, the first ring gear 31, and the second ring gear 32 are arranged in this order in the axial direction of the intermediate screw 1. The sleeve 4 and the second ring gear 32 may be fixedly connected by welding, threads, or the like. The elastic component 5 abuts against the first gear ring 31 and the sleeve 4 respectively, in fig. 1, the elastic component 5 applies a rightward acting force to the first gear ring 31, the elastic component 5 applies a leftward acting force to the second gear ring 32, and due to the gap between the first gear ring 31 and the second gear ring 32, the first gear ring 31 and the second gear ring 32 are tightly engaged with the plurality of roller bodies 2 simultaneously through the elastic component 5, so that a pre-tightening torque is generated; meanwhile, the pre-tightening force can be conveniently adjusted.
The elastic member 5 may be a disc spring. In the present embodiment, the elastic member 5 is two disc springs mounted in opposition, inner ring portions of the two disc springs abutting against each other, and outer ring portions of the two disc springs abutting against the sleeve 4 and the first ring gear 31, respectively. Of course, the magnitude of the pretightening force can also be adjusted by adjusting the rigidity of the disc spring, and the magnitude of the pretightening force moment can also be adjusted.
The differential planetary roller screw further includes a cage 6, and both ends of the plurality of roller bodies 2 are rotatably connected to the cage 6. The circumferential positioning of the plurality of roller bodies 2 is realized through the retainer 6, the relative positions of the plurality of roller bodies 2 are ensured, and the stability of the differential planetary roller screw is improved.
The differential planetary roller screw further includes a snap spring 7, and the snap spring 7 is connected to the second ring gear 32 to block the second ring gear 32 from moving in a direction close to the first ring gear 31. In the embodiment, the clamp spring 7 is arranged outside the retainer 6 and is abutted against the outer side surface of the retainer 6, and the second gear ring 32 is prevented from moving in the direction close to the first gear ring 31 by the clamp spring 7, so that the stability of the differential planetary roller screw is greatly improved; meanwhile, the structure is simple, and the installation is convenient.
Example 2
In this embodiment 2, the same portions as those in embodiment 1 are not repeated, and only different portions will be described. The elastic member 5 is located between the ring gear 3 and the sleeve 4 in embodiment 1, and the elastic member 5 is located between the first ring gear 31 and the second ring gear 32 in embodiment 2. As shown in fig. 4, 5 and 6, in the present embodiment 2, the elastic member 5 is located between the first gear ring 31 and the second gear ring 32, and two ends of the elastic member 5 respectively abut against the first gear ring 31 and the second gear ring 32. In fig. 4, the elastic component 5 will apply a force to the left to the first gear ring 31, the elastic component 5 will apply a force to the right to the second gear ring 32, and the first gear ring 31 and the second gear ring 32 are simultaneously tightly engaged with the plurality of roller bodies 2 through the elastic component 5, so as to generate a pre-tightening torque; meanwhile, the pre-tightening force can be conveniently adjusted.
In the present embodiment 2, the differential planetary roller screw does not include a snap spring, and the fixed ring gear 3 and the sleeve 4 are not mounted by the snap spring. In the present embodiment 2, the sleeve 4 includes the sleeve body 41 and the seal member 42, the end portion of the sleeve body 41 is connected to the seal member 42 and forms the accommodation chamber, and the elastic member 5, the first ring gear 31, the second ring gear 32, and the plurality of roller bodies 2 are located in the accommodation chamber. The first gear ring 31, the elastic component 5 and the second gear ring 32 are sequentially arranged on the peripheral surfaces of the plurality of roller bodies 2 along the axial direction of the middle screw rod 1, and then the sleeve body 41 is sleeved on the first gear ring 31, the elastic component 5 and the second gear ring 32 and is connected with the sealing component 42, so that the elastic component 5, the first gear ring 31, the second gear ring 32 and the plurality of roller bodies 2 are all located in the accommodating cavity, the structure is simple, and the assembly is very convenient.
The sealing part 42 can be a sealing flange, the sealing flange and the sleeve body 41 can be fixedly connected in a threaded manner, the pretightening force can be adjusted through the relative position of the sealing part 42 and the sleeve body 41, the adjustment is very convenient, and the pretightening torque can be effectively ensured to meet the requirement of the differential planetary roller screw. Of course, the sealing member 42 and the sleeve body 41 may be fixedly connected by other connection methods.
In embodiment 2, the elastic member 5 is a wave spring. Both the first ring gear 31 and the second ring gear 32 on both sides can be applied with force by the wave spring. The pre-tightening force can be adjusted by adjusting the rigidity of the wave spring, and the pre-tightening torque can be adjusted.
Example 3
In this embodiment 2, the same portions as those in embodiment 1 are not repeated, and only different portions will be described. The roller bodies 2 of the embodiment 2 are three-stage type, and in the embodiment 3, as shown in fig. 7 and 8, a plurality of roller bodies 2 are two-stage type. The remaining identical parts will not be repeated.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (9)
1. The utility model provides a differential planet roller lead screw, its characterized in that, it includes middle lead screw, ring gear, sleeve, elastomeric element and a plurality of roller body, the coaxial cover of ring gear is located middle lead screw, it is a plurality of the roller body is all around establishing the ring gear with between the middle lead screw, and a plurality of the roller body all with the ring gear middle lead screw meshes mutually, sleeve cover is located on the middle lead screw, elastomeric element ring gear and a plurality of the roller body all is located in the sleeve, just elastomeric element support lean on in the ring gear is right the ring gear is applyed the action force of middle lead screw's axial direction.
2. The differential planetary roller screw of claim 1, further comprising a cage to which both ends of a plurality of the roller bodies are rotatably coupled.
3. The differential planetary roller screw according to claim 1, wherein the ring gear includes a first ring gear and a second ring gear, both of which are engaged with the plurality of roller bodies, and the first ring gear and the second ring gear are spaced apart from each other, and the elastic member abuts against the first ring gear and/or the second ring gear.
4. The differential planetary roller screw according to claim 3, wherein the elastic member is located between the first ring gear and the second ring gear, and both ends of the elastic member abut against the first ring gear and the second ring gear, respectively.
5. The differential planetary roller screw according to claim 4, wherein the sleeve includes a sleeve body and a seal member, an end of the sleeve body is connected with the seal member and forms a receiving cavity, and the elastic member, the first ring gear, the second ring gear, and the plurality of roller bodies are located in the receiving cavity.
6. The differential planetary roller screw of claim 4, wherein the resilient member is a wave spring.
7. The differential planetary roller screw according to claim 3, wherein the first ring gear is located inside the sleeve, the second ring gear is connected to an end of the sleeve, and both ends of the elastic member abut against the first ring gear and the sleeve, respectively.
8. The differential planetary roller screw of claim 7, further comprising a snap spring coupled to the second ring gear to block movement of the second ring gear in a direction closer to the first ring gear.
9. The differential planetary roller screw of claim 7, wherein the resilient member is a disc spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011076858.8A CN113251122A (en) | 2020-10-10 | 2020-10-10 | Differential planetary roller screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011076858.8A CN113251122A (en) | 2020-10-10 | 2020-10-10 | Differential planetary roller screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113251122A true CN113251122A (en) | 2021-08-13 |
Family
ID=77180617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011076858.8A Pending CN113251122A (en) | 2020-10-10 | 2020-10-10 | Differential planetary roller screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113251122A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115111294A (en) * | 2022-08-25 | 2022-09-27 | 杭州新剑机电传动股份有限公司 | Electromechanical actuator for automobile suitable for brake-by-wire system |
Citations (8)
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|---|---|---|---|---|
| CN202091452U (en) * | 2011-06-03 | 2011-12-28 | 丽水市嘉龙轴承制造有限公司 | Double nuts of ball screw |
| CN102628500A (en) * | 2012-04-19 | 2012-08-08 | 西北工业大学 | Planet roller screw mechanism capable of eliminating axial gaps |
| CN103307239A (en) * | 2012-03-12 | 2013-09-18 | 舍弗勒技术股份两合公司 | Planetary rotor transmission device and hydrostatic actuator employing same |
| CN204755878U (en) * | 2015-03-30 | 2015-11-11 | 广州科技职业技术学院 | Ball's flexible preloading device |
| CN107208713A (en) * | 2015-02-17 | 2017-09-26 | 舍弗勒技术股份两合公司 | Actuator with planetary roller screw transmission device |
| CN208565467U (en) * | 2018-07-06 | 2019-03-01 | 杭州新剑机器人技术股份有限公司 | Planetary roller screw |
| CN110081141A (en) * | 2019-04-19 | 2019-08-02 | 南京理工大学 | A kind of device for improving double nut and pre-tightening ball screw assembly, maximum axial |
| CN112032267A (en) * | 2020-08-24 | 2020-12-04 | 上海迈道汽配有限公司 | Planetary roller screw and assembling method thereof |
-
2020
- 2020-10-10 CN CN202011076858.8A patent/CN113251122A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202091452U (en) * | 2011-06-03 | 2011-12-28 | 丽水市嘉龙轴承制造有限公司 | Double nuts of ball screw |
| CN103307239A (en) * | 2012-03-12 | 2013-09-18 | 舍弗勒技术股份两合公司 | Planetary rotor transmission device and hydrostatic actuator employing same |
| CN102628500A (en) * | 2012-04-19 | 2012-08-08 | 西北工业大学 | Planet roller screw mechanism capable of eliminating axial gaps |
| CN107208713A (en) * | 2015-02-17 | 2017-09-26 | 舍弗勒技术股份两合公司 | Actuator with planetary roller screw transmission device |
| CN204755878U (en) * | 2015-03-30 | 2015-11-11 | 广州科技职业技术学院 | Ball's flexible preloading device |
| CN208565467U (en) * | 2018-07-06 | 2019-03-01 | 杭州新剑机器人技术股份有限公司 | Planetary roller screw |
| CN110081141A (en) * | 2019-04-19 | 2019-08-02 | 南京理工大学 | A kind of device for improving double nut and pre-tightening ball screw assembly, maximum axial |
| CN112032267A (en) * | 2020-08-24 | 2020-12-04 | 上海迈道汽配有限公司 | Planetary roller screw and assembling method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115111294A (en) * | 2022-08-25 | 2022-09-27 | 杭州新剑机电传动股份有限公司 | Electromechanical actuator for automobile suitable for brake-by-wire system |
| CN115111294B (en) * | 2022-08-25 | 2022-12-16 | 杭州新剑机电传动股份有限公司 | Electromechanical actuator for automobile suitable for brake-by-wire system |
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Application publication date: 20210813 |
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| WD01 | Invention patent application deemed withdrawn after publication |