阅读说明：本技术 一种采用摆线钢球传动副的差速器 (Differential mechanism adopting cycloidal steel ball transmission pair ) 是由 梁惺 王勇 陶毅 于 2019-09-06 设计创作，主要内容包括：本发明属于差速器领域,涉及一种采用摆线钢球传动副的差速器,采用摆线钢球传动副的差速器,包括正交钢球传动副、摆线钢球传动副以及盖板；所述正交钢球传动副包括中心轮,转动设置在中心轮上的第一钢球组以及螺杆；所述摆线钢球传动副包括设置在中心轮上的第二钢球组,输出轴第一半轴,输出轴第二半轴；输出轴第二半轴外缘设有保持架；所述输出轴第一半轴设置在第二钢球组远离中心轮的一侧上。本发明创新了差速的实现方式,改善了装置的性能,整体的设计、制造、装配和使用的经济性好。本发明通过全钢球传动,避免了采用锥齿轮所带来的设计计算复杂、加工装配工艺性差、精度难以保持的弊端。(The invention belongs to the field of differentials, and relates to a differential adopting a cycloidal steel ball transmission pair, which comprises an orthogonal steel ball transmission pair, a cycloidal steel ball transmission pair and a cover plate; the orthogonal steel ball transmission pair comprises a central wheel, a first steel ball group and a screw rod, wherein the first steel ball group and the screw rod are rotatably arranged on the central wheel; the cycloidal steel ball transmission pair comprises a second steel ball group arranged on the central wheel, a first half shaft of an output shaft and a second half shaft of the output shaft; a retainer is arranged at the outer edge of the second half shaft of the output shaft; the first half shaft of the output shaft is arranged on one side, far away from the central wheel, of the second steel ball group. The invention innovates the realization mode of differential speed, improves the performance of the device and has good economical efficiency of integral design, manufacture, assembly and use. The invention avoids the defects of complex design calculation, poor processing and assembling manufacturability and difficult maintenance of precision caused by adopting the bevel gear through all-steel ball transmission.)

1. A differential mechanism adopting a cycloidal steel ball transmission pair is characterized in that: the device comprises an orthogonal steel ball transmission pair, a cycloid steel ball transmission pair and a cover plate; the orthogonal steel ball transmission pair comprises a central wheel, a first steel ball group and a screw rod, wherein the first steel ball group is rotatably arranged on one side of the central wheel; the cycloidal steel ball transmission pair comprises a second steel ball group arranged on one side of the central wheel far away from the first steel ball group, and an output shaft first half shaft and an output shaft second half shaft which are in matched transmission with the second steel ball group; a retainer is arranged at the outer edge of a second half shaft of the output shaft, and the second steel ball group is arranged in the retainer; the first half shaft of the output shaft is arranged on one side, far away from the central wheel, of the second steel ball group.

2. The differential employing cycloidal steel ball gear pairs as defined in claim 1 wherein: and one side of the central wheel, which faces the second steel ball group, is provided with a cycloid groove, and the second steel ball group is arranged in the cycloid groove.

3. The differential employing cycloidal steel ball gear pairs as defined in claim 1 or 2 wherein: and one side of the first semi-axis of the output shaft, which faces the second steel ball group, is provided with a cycloid groove, and the second steel ball group is arranged in the cycloid groove.

4. The differential employing cycloidal steel ball gear pairs as defined in claim 1 wherein: a spiral groove is formed at the matching position of the screw rod and the first steel ball group and is used for adjusting the matching clearance of the first steel ball group; the section of the spiral groove is an isosceles trapezoid groove.

5. The differential employing cycloidal steel ball gear pairs as defined in claim 1 wherein: and an isosceles trapezoid groove is formed at the matching position of the first half shaft of the output shaft and the second steel ball group and used for adjusting the matching clearance of the second steel ball group.

6. The differential employing cycloidal steel ball gear pairs as defined in claim 1 wherein: and an isosceles trapezoid groove is formed at the matching position of the central wheel and the second steel ball group and is used for adjusting the matching clearance of the second steel ball group.

7. The differential employing cycloidal steel ball gear pairs as defined in claim 1 wherein: the first steel ball groups are uniformly distributed on the end face of the central wheel.

8. The differential employing cycloidal steel ball gear pairs as defined in claim 1 wherein: the second steel ball groups are uniformly distributed on the end face, far away from the first steel ball groups, of the central wheel.

9. The differential employing cycloidal steel ball gear pairs as defined in claim 1 wherein: and a radial groove is formed in the circumferential direction of the retainer.

Technical Field

The invention belongs to the field of differentials, and relates to a differential adopting a cycloidal steel ball transmission pair.

Background

Currently, a common differential generally adopts a bevel gear and a planetary gear mechanism to realize differential transmission. The differential has the defects of complex structure, difficult processing, high requirements on assembly and adjustment, large equipment size and the like.

In the differential mechanism in the prior art, a sinusoidal groove is adopted for transmission, and the differential function is realized in a mode of combining the sinusoidal groove and the movable teeth of the steel ball for transmission. But the sine curve groove has higher requirement on processing precision and is complex to assemble; and bevel gears are needed to input power, so that the whole structure is complex, the processing and manufacturing cost is high, and the assembly and maintenance are complex.

Disclosure of Invention

In view of this, the present invention provides a differential mechanism using cycloidal steel ball transmission pair, which does not use bevel gears to realize differential function, and reduces the cost of design, assembly and maintenance.

In order to achieve the purpose, the invention provides the following technical scheme:

a differential mechanism adopting a cycloid steel ball transmission pair comprises an orthogonal steel ball transmission pair, a cycloid steel ball transmission pair and a cover plate; the orthogonal steel ball transmission pair comprises a central wheel, a first steel ball group and a screw rod, wherein the first steel ball group is rotatably arranged on one side of the central wheel; the cycloidal steel ball transmission pair comprises a second steel ball group arranged on one side of the central wheel far away from the first steel ball group, and an output shaft first half shaft and an output shaft second half shaft which are in matched transmission with the second steel ball group; a retainer is arranged at the outer edge of a second half shaft of the output shaft, and the second steel ball group is arranged in the retainer; the first half shaft of the output shaft is arranged on one side, far away from the central wheel, of the second steel ball group.

Optionally, one side of the central wheel, which faces the second steel ball group, is provided with a cycloid groove, and the second steel ball group is arranged in the cycloid groove.

Optionally, one side of the first semi-axis of the output shaft, which faces the second steel ball group, is provided with a cycloid groove, and the second steel ball group is arranged in the cycloid groove.

Optionally, a spiral groove is formed at the matching position of the screw and the first steel ball group, and is used for adjusting the matching clearance of the first steel ball group; the section of the spiral groove is an isosceles trapezoid groove.

Optionally, an isosceles trapezoid groove is formed in a matching position of the first half shaft of the output shaft and the second steel ball group, and is used for adjusting a matching gap of the second steel ball group.

Optionally, an isosceles trapezoid groove is formed at a matching position of the central wheel and the second steel ball group, and is used for adjusting a matching gap of the second steel ball group.

Optionally, the first steel ball groups are uniformly distributed on the end face of the central wheel.

Optionally, the second steel ball groups are uniformly distributed on the end face, far away from the first steel ball group, of the central wheel.

Optionally, a radial groove is formed in the circumferential direction of the retainer.

The invention has the beneficial effects that:

1. the invention realizes the differential function through the cycloid steel ball transmission pair and innovating the differential realization mode. The cycloidal steel ball transmission pair has the advantages of convenient design and calculation, good processing manufacturability, large bearing torque and no return difference in operation.

2. The invention has good economical efficiency of integral design, manufacture, assembly and use, and improves the performance of the device. And the defects of complex design calculation, poor processing and assembling manufacturability and difficulty in maintaining precision caused by the adoption of bevel gears are overcome by adopting all-steel ball transmission.

3. The invention adopts the isosceles trapezoid groove to be matched with the steel ball in the orthogonal steel ball transmission pair and the cycloid steel ball transmission pair, thereby realizing the function of clearance compensation.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a front view of the present solution;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a side view of the present solution;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3;

FIG. 5 is an enlarged view of area C of FIG. 2;

fig. 6 is an enlarged view of region D of fig. 4.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.

Referring to fig. 1-6, the reference numbers in the figures refer to the following elements: the device comprises a screw 11, a first steel ball group 12, a central wheel 13, an output shaft second half shaft 21, a second steel ball group 22, an output shaft first half shaft 23, an end cover 31, a second wheel 211, a first wheel 231 and an isosceles trapezoid groove 111.

The differential mechanism of the invention consists of an orthogonal steel ball transmission pair, a cycloid steel ball transmission pair and a cover plate 31. The orthogonal steel ball transmission pair consists of a central wheel 13, a first steel ball group 12 and a screw 11, wherein the first steel ball group 12 and the screw 11 are uniformly distributed on the end face of the central wheel 13. The cycloidal steel ball transmission pair comprises a central wheel 13, a second steel ball group 22, an output shaft second half shaft 21 and an output shaft first half shaft 23. The right end face of the central wheel 13 is provided with a cycloid groove, the left end face of the output shaft right half shaft 23 is provided with a cycloid groove, and the right side of the output shaft left half shaft 21 is a steel ball retainer with a radial groove in the circumferential direction.

The section of the spiral groove on the screw rod 11 is an isosceles trapezoid groove 111, and the gap of the orthogonal steel ball transmission pair is compensated through the adjustment of the pre-tightening amount. The cycloid groove on the central wheel 13 and the cycloid groove of the output shaft right half shaft 23 are both isosceles trapezoid grooves 111, and the gap of the cycloid steel ball transmission pair can be compensated through adjustment of the pre-tightening amount.

The power of the invention is transmitted through the screw 11, and after being decelerated by the first steel ball group 12, the motion transmission direction is converted to 90 degrees, the moment is increased, and the central wheel 13 is driven to rotate. The right end face of the central wheel 13 is provided with a cycloidal groove to drive the second steel ball group 22 to move, and then the retainer of the output shaft second half shaft 21 and the output shaft first half shaft 23 with the cycloidal groove arranged on the left end face are driven to rotate. In addition, the second steel ball set 22 can move along the groove because the retainer of the output shaft second half shaft 21 is provided with a radial groove. Therefore, the whole system becomes a two-degree-of-freedom differential system.

The retainer of the output shaft second half shaft 21 and the left end surface of the output shaft first half shaft 23 drive the output shaft second half shaft 21 and the output shaft first half shaft 23 to rotate under the driving of power, and further the rotating speed and the torque are respectively transmitted to the second wheel 211 and the first wheel 231. Although the second wheel 211 and the first wheel 231 are rotated by the power, the rotation state thereof is uncertain.

When the vehicle runs on a straight road and no slip exists between the second wheel 211 and the first wheel 231, the rotating speeds of the retainer of the output shaft second half shaft 21 and the left end face of the output shaft first half shaft 23 are the same, the second steel ball group 22 and the retainer of the output shaft second half shaft 21 and the left end face of the output shaft first half shaft 23 are relatively static, all parts in the differential system are relatively static, and the torque is averagely transmitted to the second wheel 211 and the first wheel 231 through the cycloid grooves on the right end face of the central wheel 13 and the second steel ball group 22.

When a difference occurs in the rotational speeds of the second wheel 211 and the first wheel 231 while traveling on an uneven road, the second steel ball set 22 moves along the groove of the cage while driving the cage of the output shaft second half shaft 21 and the left end face of the output shaft first half shaft 23 to rotate, so that the output shaft second half shaft 21 and the output shaft first half shaft 23 achieve a differential speed without departing from the transmission. Due to the action of the torque generated by the force applied by the steel balls to the retainer of the second half shaft 21 of the output shaft and the left end surface of the first half shaft 23 of the output shaft, the torque obtained on the driving wheel with slow rotating speed is larger than that of the driving wheel with fast rotating speed.

The invention realizes the differential function through the cycloid steel ball transmission pair and innovating the differential realization mode. The cycloidal steel ball transmission pair has the advantages of convenient design and calculation, good processing manufacturability, large bearing torque and no return difference in operation. The function of clearance compensation is realized through the use of the isosceles trapezoid groove 111. The overall design, manufacture, assembly and use of the device are economical and the performance of the device is improved. And the defects of complex design calculation, poor processing and assembling manufacturability and difficulty in maintaining precision caused by the adoption of bevel gears are overcome by adopting all-steel ball transmission.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.