CN220227712U

CN220227712U - Planetary roller screw with high-load deceleration function

Info

Publication number: CN220227712U
Application number: CN202321886967.5U
Authority: CN
Inventors: 房妤; 苏泓力; 彭彦方
Original assignee: Chengdu Technician College Chengdu Industry And Trade Vocational And Technical College Chengdu Senior Technical School Chengdu Railway Engineering School
Current assignee: Chengdu Technician College Chengdu Industry And Trade Vocational And Technical College Chengdu Senior Technical School Chengdu Railway Engineering School
Priority date: 2023-07-18
Filing date: 2023-07-18
Publication date: 2023-12-22
Anticipated expiration: 2033-07-18

Abstract

The utility model relates to the technical field of heavy commercial vehicle electromechanical braking, in particular to a planetary roller screw with a high-load deceleration function, which comprises a main body, wherein a cover plate is movably arranged on one side of the main body, a bolt is movably arranged on one side of the cover plate in a penetrating manner, a clamping ring is movably arranged on one side of the cover plate, a planetary roller is movably arranged on the inner wall of the clamping ring, a screw rod is movably arranged at the bottom of the planetary roller, the improved planetary roller screw with the high-load deceleration function adopts four planetary rollers, and is in threaded connection with the main body and the screw rod for external thread meshing transmission so as to achieve the principle of having a plurality of contact points, thereby greatly improving rigidity and shock resistance.

Description

Planetary roller screw with high-load deceleration function

Technical Field

The utility model relates to the technical field of electromechanical braking of heavy commercial vehicles, in particular to a planetary roller screw with a high-load deceleration function.

Background

The planetary roller screw is not popular due to the fact that the structure is too complex, only a few planetary roller screw pairs are produced internationally, the design and the utility model of the planetary roller screw related to some companies and enterprises are achieved in China, the load on a nut is transferred to a shaft through rollers between the nut and a screw shaft so as to operate more reliably, the existing planetary roller screw in the market is driven by matching internal threads in a main body (namely, the main body forms a structure similar to the nut) with external threads of the planetary shaft, the main body can not roll smoothly due to factors such as external load impact, the cost for processing the internal threads of the main body is high, and when the planetary roller screw is applied to braking parking of a heavy commercial vehicle, serious abrasion problems can occur in a threaded part in the repeated braking process.

The inventors found that the following problems exist in the prior art in the process of implementing the present utility model: 1. when the brake is applied to a heavy commercial vehicle, the brake parking is stressed, and serious abrasion problem can occur to the thread part in the repeated braking process; 2. in heavy-duty braking, automatic adjustment of the radial position between the planetary rollers and the shaft under radial impact load and automatic adjustment of the axial position under axial impact load cannot be performed.

Disclosure of Invention

The utility model aims to provide a planetary roller screw with a high-load deceleration function, so as to solve the problems that a screw thread part possibly has serious abrasion during repeated braking and automatic adjustment of the radial position between a planetary roller and a shaft under radial impact load and automatic adjustment of the axial position under axial impact load can not be performed in the prior art. In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a planet roller screw of high load deceleration function, includes the main part, one side movable mounting of main part has the apron, one side of apron runs through movable mounting has the bolt, one side movable mounting of apron has the rand, the inner wall movable mounting of rand has the planet roller, the bottom movable mounting of planet roller has the lead screw.

Further preferably, the cover plates are symmetrically distributed about the vertical neutral line of the main body.

Further preferably, the bolts are symmetrically distributed about the horizontal neutral line of the cover plate.

Further preferably, four mounting grooves are formed in the side face of the collar, and the inner dimensions of the mounting grooves are consistent with the outer dimension of the shaft.

Further preferably, the planetary roller comprises a shaft movably mounted on the inner wall of the collar, a first adjusting pad is movably mounted on the outer wall of the shaft, a second adjusting pad is movably mounted on the outer wall of the shaft, a plane bearing is movably mounted on the outer wall of the shaft, a needle bearing is movably mounted on the outer wall of the shaft, a bushing is movably mounted on the outer wall of the shaft, and a planetary roller is movably mounted on the outer wall of the bushing.

Further preferably, the planetary rollers are horizontally and symmetrically distributed about the screw rod.

Compared with the prior art, the utility model has the beneficial effects that:

in the utility model, planetary rollers on the four planetary rollers are connected with the main body and the screw rod through threads to carry out external thread meshing transmission so as to achieve the principle of possessing a plurality of contact points, thereby greatly improving rigidity and impact resistance, and the planetary rollers can be adjusted to eight according to the grade of load in the selection process.

According to the utility model, through the needle roller bearing in the special structural design of the planetary roller, the automatic adjustment of the radial position between the planetary roller and the shaft under the radial impact load in heavy-load braking can be realized; the automatic adjustment of the axial position under the axial impact load in heavy-duty braking can be realized by the planar bearing in the special structural design of the planetary roller.

Drawings

FIG. 1 is a schematic diagram of the front elevational view in full section of the present utility model;

FIG. 2 is a schematic side elevational view in full section of the present utility model;

FIG. 3 is a schematic diagram of an explosive structure according to the present utility model;

FIG. 4 is a schematic diagram of the planetary roller of the present utility model in full section;

fig. 5 is a schematic view of an exploded construction of the planetary roller of the present utility model.

In the figure: 1. a main body; 2. a cover plate; 3. a bolt; 4. a collar; 5. a planetary roller; 501. a shaft; 502. a first adjustment pad; 503. a second adjustment pad; 504. a planar bearing; 505. needle roller bearings; 506. a bushing; 507. planetary rollers; 6. and a screw rod.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which are obtained by a worker of ordinary skill in the art without creative efforts, are within the protection scope of the present utility model based on the embodiments of the present utility model.

Referring to fig. 1 to 5, the present utility model provides a technical solution: the utility model provides a planet roller screw of high load deceleration function, includes main part 1, and one side movable mounting of main part 1 has apron 2, and one side of apron 2 runs through movable mounting has bolt 3, and one side movable mounting of apron 2 has rand 4, and the inner wall movable mounting of rand 4 has planet roller 5, and the bottom movable mounting of planet roller 5 has lead screw 6.

In this embodiment, as shown in fig. 1, 2 and 3, the cover plates 2 are symmetrically distributed about the vertical neutral line of the main body 1; the left side and the right side of the main body 1 are sealed, and the protection effect can be better achieved.

In the present embodiment, as shown in fig. 1, 2 and 3, the bolts 3 are symmetrically distributed about the horizontal neutral line of the cover plate 2; the cover plate 2 is connected with the main body 1 by a plurality of bolts 3, so that the connection is more stable.

In this embodiment, as shown in fig. 1, 2 and 3, four mounting grooves are formed on the side surface of the collar 4, and the inner dimensions of the mounting grooves are consistent with the outer dimension of the shaft 501; the shaft 501 is firmly installed in the installation groove, and the planetary roller 5 does not shake when running.

In this embodiment, as shown in fig. 4 and 5, the planetary roller 5 includes a shaft 501 movably mounted on an inner wall of the collar 4, a first adjusting pad 502 movably mounted on an outer wall of the shaft 501, a second adjusting pad 503 movably mounted on an outer wall of the shaft 501, a plane bearing 504 movably mounted on an outer wall of the shaft 501, a needle bearing 505 movably mounted on an outer wall of the shaft 501, a bushing 506 movably mounted on an outer wall of the shaft 501, and a planetary roller 507 movably mounted on an outer wall of the bushing 506; the length of the outer wall screw thread of the planetary roller 507 is increased by 0.25 as an arithmetic progression, and the planetary roller 507 is in external thread meshing transmission with the screw rod 6 through the screw connection with the main body 1.

In the present embodiment, as shown in fig. 1, 2 and 3, the planetary rollers 5 are horizontally and symmetrically distributed about the screw 6; the principle that the main body 1 and the screw rod 6 have a plurality of contact points is achieved, so that the rigidity and the impact resistance are greatly improved.

The application method and the advantages of the utility model are as follows: the planetary roller screw with the high-load deceleration function has the following working process when in use:

as shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, firstly, planetary rollers 507 are uniformly distributed around a screw rod 6 in a planetary shape, the number of planetary rollers 5 is four, the thread length of the planetary rollers increases in an equi-differential array, the planetary rollers 507 on the four planetary rollers 5 are connected with a main body 1 and the screw rod 6 through threads to carry out external thread meshing transmission so as to achieve the principle of having a plurality of contact points, thereby greatly improving rigidity and impact resistance, the planetary rollers 5 can be adjusted to eight according to the grade of load in the selection process, automatic adjustment of the radial position between the planetary rollers 507 and a shaft 501 under radial impact load in heavy load braking can be realized through a needle bearing 505 (model number of K6X9X 8) in the special structural design of the planetary rollers 5, automatic adjustment of the axial position under axial impact load in heavy load braking can be realized through a plane bearing 504 (model number of AXK 619) in the special structural design of the planetary rollers 5, materials used for the planetary rollers 507 are all 30crMoAlA, and the numerical control forming process is required to be soft medium frequency, soft turning, and finally nitriding is required to be performed, and hardening and tempering is required. The salt bath temperature is 400 ℃; the heat preservation time is 4 hours; the salt bath ratio is rich in nitrogen, and the surface hardness of the salt bath is finally required to be about HV 0.2=766; the depth of the hardening layer is 0.25mm, so that the integrity of the thread tooth tips can be maintained on the basis of exceeding 5000 times in fatigue test analysis for heavy-load braking, the price advantage and the assembly structure are more optimized, and the high rated load is achieved; a faster rotational speed; higher acceleration and deceleration of left-handed and right-handed; better reliability; the environment with severe working conditions is resisted; better impact load resistance; and the repeated positioning precision is good.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present utility model, and are not intended to limit the utility model, and that various changes and modifications may be made therein without departing from the spirit and scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. Planetary roller screw of high load deceleration function, including main part (1), its characterized in that: one side movable mounting of main part (1) has apron (2), one side of apron (2) runs through movable mounting has bolt (3), one side movable mounting of apron (2) has rand (4), the inner wall movable mounting of rand (4) has planetary roller (5), the bottom movable mounting of planetary roller (5) has lead screw (6).

2. The high load reduction function planetary roller screw of claim 1, wherein: the cover plates (2) are symmetrically distributed about the vertical neutral line of the main body (1).

3. The high load reduction function planetary roller screw of claim 1, wherein: the bolts (3) are symmetrically distributed about the horizontal neutral line of the cover plate (2).

4. The high load reduction function planetary roller screw of claim 1, wherein: four mounting grooves are formed in the side face of the clamping ring (4), and the inner size of each mounting groove is consistent with the outer size of the shaft (501).

5. The high load reduction function planetary roller screw of claim 1, wherein: the planetary roller (5) comprises a shaft (501) movably mounted on the inner wall of a clamping ring (4), a first adjusting pad (502) is movably mounted on the outer wall of the shaft (501), a second adjusting pad (503) is movably mounted on the outer wall of the shaft (501), a plane bearing (504) is movably mounted on the outer wall of the shaft (501), a needle bearing (505) is movably mounted on the outer wall of the shaft (501), a bushing (506) is movably mounted on the outer wall of the shaft (501), and a planetary roller (507) is movably mounted on the outer wall of the bushing (506).

6. The high load reduction function planetary roller screw of claim 1, wherein: the planetary rollers (5) are horizontally and symmetrically distributed about the screw rod (6).