CN113124118A - Differential type planet roller screw and electric cylinder comprising same - Google Patents
Differential type planet roller screw and electric cylinder comprising same Download PDFInfo
- Publication number
- CN113124118A CN113124118A CN202010042857.5A CN202010042857A CN113124118A CN 113124118 A CN113124118 A CN 113124118A CN 202010042857 A CN202010042857 A CN 202010042857A CN 113124118 A CN113124118 A CN 113124118A
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- Prior art keywords
- nut
- screw
- rollers
- planetary roller
- screw rod
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- 230000005540 biological transmission Effects 0.000 claims abstract description 3
- 230000033001 locomotion Effects 0.000 claims description 13
- 230000000717 retained effect Effects 0.000 claims 1
- 239000000446 fuel Substances 0.000 abstract description 10
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
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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
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
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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
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
- F16H25/2252—Planetary rollers between nut and screw
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vehicle Body Suspensions (AREA)
- Transmission Devices (AREA)
Abstract
The invention discloses a differential planetary roller screw which comprises a nut, a screw rod, rollers and a motor rotor, wherein the screw rod penetrates through the nut, the rollers are arranged in the nut and surround the screw rod, the rollers are in transmission engagement with internal threads of the nut and external threads of the screw rod, the tooth form half angle of the screw rod is 25-30 degrees, and the motor rotor is connected with the nut or the screw rod and drives the nut or the screw rod. The differential planetary roller screw can improve efficiency and reduce energy consumption. The fuel consumption of the whole automobile can be reduced by applying the fuel composition to the automobile industry. The direct connection mode through the electric motor rotor reduces the axial space of planet roller lead screw application structure, improves the energy volume ratio of structure, and the energy quality ratio is applied to the car, can improve the friendship of arranging, better arrangement space.
Description
Technical Field
The invention relates to a differential planetary roller screw and an electric cylinder comprising the same.
Background
The tooth form half angle of the planetary roller screw is usually set to 45 degrees, however, as shown in fig. 1, the efficiency of the planetary roller screw is reduced along with the increase of the tooth form half angle, and the tooth form half angle of the planetary roller screw of 45 degrees is usually not high at present due to the reason that the requirement of the application occasion is not high. However, such efficiency is very inefficient when applied to the automotive industry. In addition, as shown in fig. 1, when the planetary roller screw (including the screw 1, the nut 2, the roller 3, and the bearing 5) is used as an actuator in an electric cylinder, the motor 4 drives the screw 1 through the synchronous belt 6, which results in a large axial size, a large space, and insufficient compactness of the actuator, and is not favorable for the application of products in small spaces.
Disclosure of Invention
The invention aims to overcome the defects that a planetary roller screw in the prior art is low in efficiency, large in axial size, large in space and not compact when applied to an electric cylinder, and provides a differential planetary roller screw and the electric cylinder comprising the same.
The invention solves the technical problems through the following technical scheme:
the differential planetary roller screw is characterized by comprising a nut, a screw, rollers and a motor rotor, wherein the screw penetrates through the nut, the rollers are arranged inside the nut and surround the screw, the rollers are in transmission engagement with internal threads of the nut and external threads of the screw, the thread form half angle of the screw is 25-30 degrees, and the motor rotor is connected with the nut or the screw and drives the nut or the screw.
The differential planetary roller screw can improve efficiency and reduce energy consumption. The fuel consumption of the whole automobile can be reduced by applying the fuel composition to the automobile industry. The direct connection mode through the electric motor rotor reduces the axial space of planet roller lead screw application structure, improves the energy volume ratio of structure, and the energy quality ratio is applied to the car, can improve the friendship of arranging, better arrangement space.
Preferably, the motor rotor is directly connected with the nut and drives the nut to rotate, the nut drives the rollers to do planetary motion around the screw, and the rollers drive the screw to rotate and enable the screw to move in the axial direction relative to the nut. In order to reduce the axial space of the differential planetary roller screw, a nut is adopted as a driving part, and a motor rotor is installed on the nut, so that the purpose of reducing the axial space is achieved. The motor rotor is fixedly connected with the nut. When the motor works, the motor rotor and the nut rotate simultaneously, the nut rotates to drive the roller to rotate, the roller revolves and rotates, the screw rod is pushed to move forwards, and the work of a set target is finished.
Preferably, the motor rotor is sleeved outside the nut. The motor rotor and the nut are axially overlapped through the sleeve joint, and the occupation of axial space can be obviously reduced.
Preferably, the nut is provided with a positioning bearing, and the positioning bearing is arranged between the nut and the cylinder body. The positioning bearing ensures that the nut can rotate smoothly relative to the cylinder.
Preferably, the motor rotor is directly connected with the screw rod and drives the screw rod to rotate, the screw rod drives the roller to do planetary motion around the screw rod, and the roller drives the nut to rotate and enables the nut to move relative to the screw rod in the axial direction. Aiming at the electric cylinder mechanism with surplus axial space, the electronic rotor can be directly and fixedly connected with the lead screw, and the lead screw is used as a driving mode, so that the occupation of the whole space can be reduced.
Preferably, the nut is connected with a flat key, and the flat key is limited in a sliding groove on the cylinder body and performs axial linear motion along the sliding groove. The flat key of the nut is matched with the sliding groove of the cylinder body to guide the nut to move linearly and output the movement.
Preferably, the differential planetary roller screw further comprises a cage disposed within the nut and constraining the rollers from planetary motion about the screw.
Preferably, the differential planetary roller screw further comprises a snap spring, and the snap spring is clamped in the nut and blocked at two ends of the retainer.
Preferably, the lead screw has a profile half angle of 25 degrees, 27.5 degrees or 30 degrees.
An electric cylinder, characterized in that it comprises said differential planetary roller screw.
The positive progress effects of the invention are as follows: the differential planetary roller screw can improve efficiency and reduce energy consumption. The fuel consumption of the whole automobile can be reduced by applying the fuel composition to the automobile industry. The direct connection mode through the electric motor rotor reduces the axial space of planet roller lead screw application structure, improves the energy volume ratio of structure, and the energy quality ratio is applied to the car, can improve the friendship of arranging, better arrangement space.
Drawings
FIG. 1 is a graph of the variation of tooth profile half angle and efficiency.
Fig. 2 is a schematic structural view of an electric cylinder of the prior art.
Fig. 3 is a schematic view of the overall structure of the differential planetary roller screw according to an embodiment of the present invention.
FIG. 4 is a schematic cross-sectional view of a differential planetary roller screw according to an embodiment of the present invention.
Fig. 5 is a schematic view of the overall structure of a differential planetary roller screw according to another embodiment of the present invention.
FIG. 6 is a cross-sectional structural schematic view of a differential planetary roller screw according to another embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
As shown in fig. 3-6, the present embodiment discloses a differential planetary roller screw, which is characterized in that the differential planetary roller screw of the present invention comprises a nut 2, a screw 1, rollers 3 and a motor rotor 4, wherein the screw 1 passes through the nut 2, the rollers 3 are disposed inside the nut 2 and surround the screw 1, the rollers 3 are in driving engagement with the internal threads of the nut 2 and the external threads of the screw 1, the thread form half angle of the screw 1 is 25-30 degrees, and the motor rotor 4 is connected with the nut 2 or the screw 1 and drives the nut 2 or the screw 1.
The differential planetary roller screw can improve efficiency and reduce energy consumption. The fuel consumption of the whole automobile can be reduced by applying the fuel composition to the automobile industry. The direct connection mode through motor rotor 4 reduces the axial space of planet roller lead screw application structure, improves the energy volume ratio of structure, and the energy quality ratio is applied to the car, can improve the friendship of arranging, better arrangement space.
As shown in fig. 3 and 4, in an embodiment of the present invention, the motor rotor 4 is directly connected to the nut 2 and drives the nut 2 to rotate, the nut 2 drives the rollers 3 to perform a planetary motion around the screw 1, and the rollers 3 drive the screw 1 to rotate and cause the screw 1 to move in the axial direction relative to the nut 2. In order to reduce the axial space of the differential planetary roller screw, the nut 2 is adopted as a driving part, and the nut 2 is provided with the motor rotor 4, so that the purpose of reducing the axial space is achieved. The motor rotor 4 is fixedly connected with the nut 2. When the motor rotor 4 and the nut 2 rotate simultaneously during working, the nut 2 rotates to drive the roller 3 to rotate, the roller 3 revolves and rotates, and the screw rod 1 is pushed to move forwards to complete the work of a set target.
As shown in fig. 3 and 4, the motor rotor 4 in one embodiment of the present invention is sleeved outside the nut 2. The motor rotor 4 and the nut 2 are axially overlapped through the sleeve joint, and the occupation of axial space can be obviously reduced.
As shown in fig. 5 and 6, the nut 2 according to an embodiment of the present invention is provided with a positioning bearing 5, and the positioning bearing 5 is disposed between the nut 2 and the cylinder. The positioning bearing 5 ensures that the nut 2 can rotate smoothly relative to the cylinder.
As shown in fig. 5 and 6, in another embodiment of the present invention, the motor rotor 4 is directly connected to the screw 1 and drives the screw 1 to rotate, the screw 1 drives the rollers 3 to perform a planetary motion around the screw 1, and the rollers 3 drive the nut 2 to rotate and cause the nut 2 to move in the axial direction relative to the screw 1. Aiming at the electric cylinder mechanism with surplus axial space, the electronic rotor can be directly and fixedly connected with the lead screw 1, and the lead screw 1 is used as a driving mode, so that the occupation of the whole space can be reduced.
As shown in fig. 5 and 6, a flat key 8 is connected to the nut 2 in another embodiment of the present invention, and the flat key 8 is limited to a sliding groove of the cylinder body and performs an axial linear motion along the sliding groove. The flat key 8 of the nut 2 is matched with the sliding groove of the cylinder body to guide the nut 2 to move linearly and output the movement.
As shown in fig. 3 and 4, the differential planetary roller screw of the present invention further comprises a cage 6, the cage 6 being disposed within the nut 2 and constraining the rollers 3 from planetary motion about the screw 1.
As shown in fig. 3 and 4, the differential planetary roller screw of the present invention further includes a snap spring 7, and the snap spring 7 is snapped in the nut 2 and blocked at both ends of the retainer 6.
In the present invention, the thread form half angle of the lead screw 1 is 25 degrees, 27.5 degrees, or 30 degrees. These angles also serve the purpose of increasing the efficiency of the planetary roller screw.
The invention also includes an electric cylinder comprising the differential planetary roller screw described above.
The positive progress effects of the invention are as follows: the differential planetary roller screw can improve efficiency and reduce energy consumption. The fuel consumption of the whole automobile can be reduced by applying the fuel composition to the automobile industry. The direct connection mode through the electric motor rotor reduces the axial space of planet roller lead screw application structure, improves the energy volume ratio of structure, and the energy quality ratio is applied to the car, can improve the friendship of arranging, better arrangement space.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (10)
1. The differential planetary roller screw is characterized by comprising a nut, a screw rod, rollers and a motor rotor, wherein the screw rod penetrates through the interior of the nut, the rollers are arranged in the interior of the nut and surround the screw rod, the rollers are in transmission engagement with the internal threads of the nut and the external threads of the screw rod, the tooth form half angle of the screw rod is 25-30 degrees, and the motor rotor is connected with the nut or the screw rod and drives the nut or the screw rod.
2. The differential planetary roller screw of claim 1, wherein the motor rotor is directly coupled to the nut and drives the nut to rotate, the nut driving the rollers to perform planetary motion about the screw, the rollers driving the screw to rotate and causing the screw to move axially relative to the nut.
3. The differential planetary roller screw of claim 2, wherein the motor rotor is journalled outside the nut.
4. The differential planetary roller screw of claim 2, wherein the nut has a locating bearing mounted thereon, the locating bearing being disposed between the nut and the cylinder block.
5. The differential planetary roller screw of claim 1, wherein the motor rotor is directly coupled to the screw and drives the screw in rotation, the screw driving the rollers in planetary motion about the screw, the rollers driving the nut in rotation and causing the nut to move axially relative to the screw.
6. The differential planetary roller screw according to claim 5, wherein a flat key is connected to the nut, the flat key being retained in a slide groove of the cylinder body and linearly moving in an axial direction along the slide groove.
7. The differential planetary roller screw of claim 1, further comprising a cage disposed within the nut and constraining the rollers from planetary motion about the screw.
8. The differential planetary roller screw of claim 7, further comprising a snap spring captured within the nut and captured at both ends of the cage.
9. The differential planetary roller screw of claim 1, wherein the screw has a profile half angle of 25 degrees, 27.5 degrees, or 30 degrees.
10. An electric cylinder, characterized in that it comprises a differential planetary roller screw according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010042857.5A CN113124118A (en) | 2020-01-15 | 2020-01-15 | Differential type planet roller screw and electric cylinder comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010042857.5A CN113124118A (en) | 2020-01-15 | 2020-01-15 | Differential type planet roller screw and electric cylinder comprising same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113124118A true CN113124118A (en) | 2021-07-16 |
Family
ID=76771467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010042857.5A Withdrawn CN113124118A (en) | 2020-01-15 | 2020-01-15 | Differential type planet roller screw and electric cylinder comprising same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113124118A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114301225A (en) * | 2021-11-22 | 2022-04-08 | 广东培敏智能科技有限公司 | Novel planet roller screw rod device with low noise and strong bearing capacity |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103671790A (en) * | 2013-12-04 | 2014-03-26 | 兰州飞行控制有限责任公司 | Nut rotating limiting device of ball screw pair |
| CN103909668A (en) * | 2014-04-02 | 2014-07-09 | 西安交通大学 | Mechanical idle-stroke and electric supercharge servo energy-saving hydraulic machine with oilless pumps |
| CN106763602A (en) * | 2017-01-16 | 2017-05-31 | 程春林 | A kind of multiple thread planetary spindle drive |
| CN207200476U (en) * | 2017-08-09 | 2018-04-06 | 中国电建集团装备研究院有限公司 | A kind of planetary roller screw pair electromechanical integration Linear Actuation System |
| CN211693406U (en) * | 2020-01-15 | 2020-10-16 | 杭州新剑机器人技术股份有限公司 | Differential type planet roller screw and electric cylinder comprising same |
-
2020
- 2020-01-15 CN CN202010042857.5A patent/CN113124118A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103671790A (en) * | 2013-12-04 | 2014-03-26 | 兰州飞行控制有限责任公司 | Nut rotating limiting device of ball screw pair |
| CN103909668A (en) * | 2014-04-02 | 2014-07-09 | 西安交通大学 | Mechanical idle-stroke and electric supercharge servo energy-saving hydraulic machine with oilless pumps |
| CN106763602A (en) * | 2017-01-16 | 2017-05-31 | 程春林 | A kind of multiple thread planetary spindle drive |
| CN207200476U (en) * | 2017-08-09 | 2018-04-06 | 中国电建集团装备研究院有限公司 | A kind of planetary roller screw pair electromechanical integration Linear Actuation System |
| CN211693406U (en) * | 2020-01-15 | 2020-10-16 | 杭州新剑机器人技术股份有限公司 | Differential type planet roller screw and electric cylinder comprising same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114301225A (en) * | 2021-11-22 | 2022-04-08 | 广东培敏智能科技有限公司 | Novel planet roller screw rod device with low noise and strong bearing capacity |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210716 |
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| WW01 | Invention patent application withdrawn after publication |