阅读说明：本技术 一种滑块拨叉装置 (Slider shifting fork device ) 是由 王皓 魏厚震 余东东 李磊 刘冠达 于 2020-05-19 设计创作，主要内容包括：本发明涉及一种滑块拨叉装置,属于滑块拨叉装置技术领域,解决了现有技术中滑块拨叉结构中传动销与拨叉之间磨损产生配合间隙无法消除的问题。本发明包括消隙单元、滚珠丝杠(1)、丝杠螺母(2)和输出轴(6)；消隙单元用于消除滑块拨叉装置的磨损间隙；丝杠螺母(2)将直线往复运动转化为输出轴(6)的旋转运动。本发明的滑块拨叉装置,通过在滑块两端的圆锥销之间设置弹簧,在弹簧弹力的作用下圆锥销与拨叉的倾斜面始终保持接触,消除了滑块拨叉长时间工作下磨损产生的配合间隙,结构简单紧凑、使用方便。(The invention relates to a sliding block shifting fork device, belongs to the technical field of sliding block shifting fork devices, and solves the problem that in the prior art, a fit clearance cannot be eliminated due to abrasion between a transmission pin and a shifting fork in a sliding block shifting fork structure. The invention comprises a clearance eliminating unit, a ball screw (1), a screw nut (2) and an output shaft (6); the gap eliminating unit is used for eliminating the abrasion gap of the sliding block shifting fork device; the screw nut (2) converts the linear reciprocating motion into the rotary motion of the output shaft (6). According to the slider shifting fork device, the springs are arranged between the conical pins at the two ends of the slider, the conical pins are always in contact with the inclined surface of the shifting fork under the action of the elastic force of the springs, the fit clearance generated by abrasion of the slider shifting fork during long-time work is eliminated, and the slider shifting fork device is simple and compact in structure and convenient to use.)

1. A slider shifting fork device is characterized by comprising a clearance elimination unit, a ball screw (1), a screw nut (2) and an output shaft (6); the screw nut (2) converts the linear reciprocating motion into the rotary motion of the output shaft (6).

2. A slider-fork arrangement according to claim 1, characterized in that the anti-backlash unit comprises a slider (3) and a taper pin (4).

3. A slider fork arrangement according to claim 2, wherein the anti-backlash unit further comprises a spring (5), the spring (5) being arranged in a through hole (321) of the slider (3), the spring (5) being arranged around the cylindrical portion of the taper pin (4).

4. A slider fork arrangement according to claim 3, characterized in that the taper pin (4) is movable within the through hole (321) under the spring force of the spring (5).

5. A slider fork arrangement according to claim 2, characterized in that the lower part of the lead screw nut (2) is provided with a groove (21), the slider (3) comprising a slider body (32), the slider body (32) being provided in the groove (21).

6. A slider fork arrangement according to claim 3, wherein the through hole (321) is provided in the centre of the side of the slider body (32).

7. A slider shift fork device according to claim 2, wherein the output shaft (6) is provided with a shift fork having a U-shaped opening.

8. A slider fork arrangement according to claim 7, characterized in that the taper pin (4) forms a sliding pair with the U-shaped opening.

9. A slider fork arrangement according to claim 7, characterized in that the anti-backlash unit is capable of eliminating the wear clearance between the taper pin (4) and the U-shaped opening.

10. A slider fork arrangement according to claims 2-9, characterized in that the taper of the taper pin (4) is 1: 3.

Technical Field

The invention relates to the technical field of sliding block shifting fork devices, in particular to a sliding block shifting fork device.

Background

Slider shift fork structure wide application is in rotatory output's actuating mechanism, wherein the most common transmission form is the linear motion who converts the rotary motion of motor into screw nut through ball, the vice rotary motion who converts screw nut's linear motion into the output shaft of slip that rethread slider shift fork is constituteed, this kind of transmission form has space utilization and is high, reduction ratio characteristics such as big, but usually the slider adopts cylindric lock and shift fork opening cooperation to become the sliding pair, belong to the line contact type between the two, line contact zone contact stress is great in the transmission process, the cylindric lock produces wearing and tearing easily after long-term work, lead to cooperating between transmission pin and the shift fork and produce the clearance, lead to the device performance to descend, life shortens.

Disclosure of Invention

In view of the foregoing analysis, an embodiment of the present invention is directed to a slider shift fork device and an adjusting method thereof, so as to solve the problem that the fit clearance generated by the abrasion between the transmission pin and the shift fork in the existing slider shift fork structure cannot be eliminated.

The invention provides a sliding block shifting fork device which comprises a clearance eliminating unit, a ball screw, a screw nut and an output shaft, wherein the clearance eliminating unit is arranged on the ball screw; the lead screw nut converts the linear reciprocating motion into the rotary motion of the output shaft.

Further, the anti-backlash unit comprises a sliding block and a taper pin.

Furthermore, the clearance eliminating unit also comprises a spring, the spring is arranged in the through hole of the sliding block, and the spring is sleeved on the cylindrical part of the taper pin.

Further, the taper pin can move in the through hole under the elastic force of the spring.

Further, the lower part of the lead screw nut is provided with a groove, the sliding block comprises a sliding block main body, and the sliding block main body is arranged in the groove.

Further, the through hole is formed in the center of the side face of the slider main body.

Furthermore, the output shaft is provided with a shifting fork, and the shifting fork is provided with a U-shaped opening.

Further, the taper pin and the U-shaped opening form a sliding pair.

Further, the anti-backlash unit can eliminate a wear gap between the taper pin and the U-shaped opening.

Further, the taper of the taper pin is 1: 3.

Compared with the prior art, the invention can realize at least one of the following beneficial effects:

(1) the sliding block shifting fork device is provided with the clearance eliminating unit, and the clearance eliminating unit can eliminate the clearance between the conical pin and the U-shaped opening in the sliding block shifting fork and ensure the operation reliability of the sliding block shifting fork device.

(2) According to the invention, the groove arranged at the lower part of the screw nut is matched with the slide block main body, so that the degree of freedom of the slide block along the axis of the roller screw is limited, the first connecting lug and the second connecting lug are fixedly connected with the lower end of the screw nut, so that when the linear motion of the screw nut is converted into the rotary motion, the slide block is uniformly stressed, the connection fracture caused by the long-term shearing force applied to the single side of the slide block is avoided, and the reliability of the slide block shifting fork device is ensured.

(3) The sliding block comprises a first connecting lug, a second connecting lug and a sliding block main body, wherein the first connecting lug and the second connecting lug are symmetrically arranged on two sides of the sliding block main body and are used for being fixedly connected with a lead screw nut, the sliding block main body is of a cuboid structure, a square through hole is formed in the middle of the sliding block main body, and the sliding block is simple in structure and easy to process.

(4) The taper pin comprises a taper part, a square part and a cylindrical part, wherein the taper part is matched with the U-shaped opening, and the square part is arranged in the square through hole, so that the taper pin only has the freedom of movement along the through hole, and the stability of the force transmission process is ensured.

(5) The two ends of the sliding block are provided with the taper pins, the cylindrical parts of the two taper pins are connected with the spring, the spring is in a compressed state, and the taper parts of the taper pins are always contacted with the side surface of the U-shaped opening under the action of the elastic force of the spring to eliminate gaps.

(6) The side surface of the U-shaped opening is an inclined surface, the inclined surface is matched with the conical part of the conical pin to form a linear sliding pair, and the conical part is ensured to be always contacted with the inclined surface under the action of the elastic force of the spring, so that the abrasion clearance of the device is automatically eliminated in the use process, and the service life of the sliding block shifting fork device is prolonged.

(7) The surfaces of the taper pin and the U-shaped opening are subjected to shot blasting treatment, so that the surface wear resistance is improved.

In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.

FIG. 1 is an overall configuration view of a slider fork apparatus according to an embodiment;

FIG. 2 is an exploded view of the structure of the slider fork arrangement of the exemplary embodiment;

FIG. 3 is a partial cross-sectional view of a slider fork arrangement of an exemplary embodiment;

fig. 4 is a cross-sectional view of a receiving analysis of a taper pin according to an embodiment.

Reference numerals:

1-roller screw; 2-lead screw nut; 21-a groove; 3-a slide block; 31-a first connection lug; 32-a slider body; 321-a through hole; 33-a second engaging lug; 4-taper pin; 41-a first taper pin; 411-a first conical portion; 412-a first square; 413-a first cylindrical portion; 42-a second taper pin; 421-a second conical portion; 422-a second square; 423-a second cylindrical portion; 5-a spring; 6-an output shaft; 61-a first fork; 611-a first U-shaped opening; 62-a second fork; 621-second U-shaped opening.

Detailed Description

The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention and not to limit its scope.

In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the term "connected" should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection, which may be a mechanical connection, an electrical connection, which may be a direct connection, or an indirect connection via an intermediate medium. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The terms "top," "bottom," "above … …," "below," and "on … …" as used throughout the description are relative positions with respect to components of the device, such as the relative positions of the top and bottom substrates inside the device. It will be appreciated that the devices are multifunctional, regardless of their orientation in space.

A specific embodiment of the present invention, as shown in fig. 1 to 4, discloses a slider fork device, which comprises a backlash eliminating unit, a ball screw 1, a screw nut 2 and an output shaft 6, wherein the backlash eliminating unit comprises a slider 3, a taper pin 4 and a spring 5; the ball screw 1 is sleeved in the screw nut 2, the sliding block 3 is fixedly arranged at the lower part of the screw nut 2, and the taper pin 4 is arranged at the end part of the sliding block 3 and is detachably connected with the sliding block 3; the taper pin 4 and the slide block 3 form a sliding pair, and the conical surface of the taper pin 4 and the U-shaped opening of the output shaft 6 form a sliding pair; the gap eliminating unit can eliminate the abrasion gap of the sliding block shifting fork; the lead screw nut 2 converts the linear reciprocating motion into the rotary motion of an output shaft 6 through a slide block 3.

Compared with the prior art, the slider shifting fork device of this embodiment is equipped with the gap eliminating unit, and the gap eliminating unit can eliminate the clearance between taper pin and the U-shaped opening in the slider shifting fork, guarantees the reliability of slider shifting fork device operation.

In order to improve the reliability of the connection between the screw nut 2 and the slider 3 and avoid the rotation between the slider 3 and the screw nut 2, the lower end of the screw nut 2 is provided with a planar part, the planar part is provided with a groove 21, and the slider body 31 is arranged in the groove 21. Specifically, the groove 21 is provided in the middle of the flat portion, the length direction of the groove 21 is perpendicular to the axial direction of the roller screw 1, and the length of the groove 21 is equal to the width of the flat portion.

In this embodiment, the slider 3 serves as an intermediate link for converting the linear motion of the roller screw 1 into the rotational motion of the output shaft 6, the slider 3 includes a first engaging lug 31, a slider main body 32, and a second engaging lug 33, the first engaging lug 31 and the second engaging lug 33 are symmetrically disposed at the middle position of the side surface of the slider main body 32, and the first engaging lug 31 and the second engaging lug 32 are disposed along the length direction of the slider main body 32. The first connecting lug 31 and the second connecting lug 33 are used for being connected with the plane part of the screw nut 2, specifically, the shape and the size of the first connecting lug 31 and the second connecting lug 33 are consistent, the length of the first connecting lug 31 is equal to the width of the plane part, and the first connecting lug 31 and the second connecting lug 33 are fixedly arranged on the plane part in a welding or screw connection mode.

In this embodiment, the first engaging lug 31 and the second engaging lug 33 are connected to the planar portion of the lead screw nut 2 by screws, which facilitates replacement and maintenance of the slider 3. Two connecting side lugs are symmetrically arranged on two sides of the sliding block main body 32, so that when the linear motion of the lead screw nut 2 is converted into the rotary motion along the linear motion direction, the sliding block 3 is stressed uniformly, and the phenomenon that the single side of the sliding block 3 is subjected to long-term shearing force to generate connection fracture is avoided.

Further, slider main part 32 is the cuboid structure, and the width of slider main part 32 equals the width of recess 21, and the distance of the top surface of slider main part 32 to the top surface of first engaging lug 31 equals the degree of depth of recess 21, and slider main part 32 is opened has through-hole 321, and specifically, through-hole 321 sets up along the length direction of cuboid, and through-hole 321 sets up in the side middle part of slider main part 32, and through-hole 321 is the quad slit. In this embodiment, slider main part 32 establishes to the cuboid structure, is connected with the recess 21 cooperation, and the installation of being convenient for, spacing in the use, avoid relying on two engaging lugs alone promptly and screw nut 2's plane portion to be connected transmission power, slider main part 32 is spacing with the side cooperation of recess 21, has increased the stability of biography power in-process, and slider main part 32's simple structure, easily processing.

The first engaging lug 31 and the second engaging lug 33 are integrally formed with the slider body 32 or are connected by welding.

In order to improve the stability of the force transmission process, the taper pin 4 includes a first taper pin 41 and a second taper pin 42, the first taper pin 41 and the second taper pin 42 are respectively disposed at two ends of the slider 3, the first taper pin 41 and the second taper pin 42 can slide relative to the slider 3, and specifically, the first taper pin 41 and the second taper pin 42 are close to or far from each other along the length direction of the slider 3.

Specifically, the first conical pin 41 includes a first conical portion 411, a first square portion 412 and a first cylindrical portion 413, the first conical portion 411 is fitted with the U-shaped opening of the output shaft 6 to form a sliding pair, the height of the first conical portion 411 is greater than the width of the fork of the output shaft 6, that is, after the first conical portion 411 is fitted with the U-shaped opening of the fork, the top surface of the first conical portion 411 is flush with the outer side of the fork, the bottom surface of the first conical portion 411 is located in the space formed by the two forks of the output shaft 6, the structure is configured to leave a movement margin for the first conical portion 411, that is, after the long slider fork device works for a long time, the contact area between the first conical portion 411 and the U-shaped opening generates a wear gap, the first conical portion 411 can move outwards along the axial direction of the slider body 32 under the action of the spring 5, so that the first conical portion 411 is always in contact with the inclined plane of the U-shaped opening of the output shaft 6 to eliminate the gap generated by wear, compare in long-term use production wearing and tearing clearance, lead to the device performance to descend, shorten life's traditional shift fork slider device, first circular cone portion 411 automatic elimination and U-shaped open-ended wearing and tearing clearance under the effect of spring 5 have guaranteed the biography power performance of slider shift fork device, have improved slider shift fork device life.

The first square part 412 is arranged in the center of the bottom surface of the first conical part 411, the first square part 412 is of a cubic structure, the edge length of the first square part 412 is equal to the side length of the through hole 321, the first square part 412 is arranged in the through hole 321 to form a sliding pair, so that the first conical pin 41 only has the freedom of movement in the pin shaft direction, the first conical part 411 is prevented from rotating in the U-shaped opening, and the linear motion of the lead screw nut 2 cannot be converted into the rotary motion of the output shaft 6.

In order to achieve the connection of the spring 5 with the first taper pin 41, a first cylindrical portion 413 is provided at the lower end of the first square portion 412, i.e., one end of the first square portion 412 is connected with the bottom of the first taper pin 41, and the other end is provided with the first cylindrical portion 413, specifically, the first cylindrical portion 413 is provided at the middle of the lower end of the first square portion 412. The diameter of the first cylindrical portion 413 is equal to the inner diameter of the spring 5. The spring 5 is sleeved on the first cylindrical portion 413 and abuts against the bottom surface of the first square portion 412, and under the action of the spring 5, the first taper pin 41 can move along the axis of the through hole 321 to eliminate backlash.

In order to limit the other end of the spring 5 and at the same time increase the reliability of the force transmission of the adjusting device, a second conical pin 42 is arranged symmetrically to the cross section of the slider body 31 at the other end of the spring 5. Specifically, the second taper pin 42 includes a second taper portion 421, a second square portion 422 and a second cylindrical portion 423, the second taper portion 421 is engaged with the U-shaped opening of the output shaft 6 to form a sliding pair, the height of the second taper portion 421 is greater than the width of the fork of the output shaft 6, that is, after the second taper portion 421 is engaged with the U-shaped opening of the fork, the top surface of the second taper portion 421 is flush with the outer side of the fork, the bottom surface of the second taper portion 421 is located in the space formed by the two forks of the output shaft 6, the structure is configured to allow the second taper portion 421 to have a movement margin, that is, after long-term operation, a wear gap is generated in the contact area between the second taper portion 421 and the U-shaped opening, the second taper portion 421 can move outward along the axial direction of the slider body 32 under the action of the spring 5, so that the second taper portion 421 is always in contact with the inclined surface of the U-shaped opening of the output shaft 6 to eliminate the gap generated by wear, compared with a sliding block shifting fork device with reduced force transmission performance due to abrasion gaps generated by long-time use, the second conical part 421 automatically eliminates the abrasion gaps with the U-shaped opening under the action of the spring 5, so that the force transmission performance of the sliding block shifting fork device is ensured, and the service life of the sliding block shifting fork device is prolonged.

The second square part 422 is arranged in the center of the bottom surface of the second conical part 421, the second square part 422 is of a cubic structure, the edge length of the second square part 422 is equal to the side length of the through hole 321, the second square part 422 is arranged in the through hole 321 to form a sliding pair, so that the second conical pin 42 only has a moving degree of freedom in the direction of the pin shaft, the second conical part 421 is prevented from rotating in the U-shaped opening, and the linear motion of the lead screw nut 2 cannot be converted into the rotary motion of the output shaft 6.

In order to realize the connection between the spring 5 and the second taper pin 42, the second cylindrical portion 423 is disposed at the lower end of the second square portion 422, that is, one end of the second square portion 422 is connected to the bottom of the second taper pin 42, and the other end is provided with the second cylindrical portion 423, specifically, the second cylindrical portion 423 is disposed in the middle of the lower end of the second square portion 422, the diameter of the second cylindrical portion 423 is equal to the inner diameter of the spring 5, the spring 5 is sleeved on the second cylindrical portion 423 and abuts against the bottom surface of the second square portion 422, and under the action of the spring 5, the second taper pin 42 can move along the axis of the through hole 321 to eliminate backlash.

In order to improve the structural strength of the taper pin 4, the first taper pin 41 and the second taper pin 42 are integrally molded.

Considering that the taper pin 4 is worn during use, the outer surface of the taper pin 4 is shot-peened to increase the wear resistance of the taper pin 4.

In this embodiment, the first square portion 412 and the second square portion 422 are both disposed at two ends of the slider body 32, the spring 5 is sleeved in the through hole 321, two ends of the spring 5 are respectively connected to the first cylindrical portion 412 and the second cylindrical portion 422, the spring 5 is in a compressed state in the through hole 321, and under the elastic force of the spring 5, the first conical pin 41 and the second conical pin 42 move towards two ends of the spring 5, so that the first conical portion 412 and the second conical portion 422 are always in contact with the inclined surface lines of the corresponding U-shaped openings, and the wear gap is automatically eliminated in the using process.

The sum of the distance from the bottom surface of the first cylindrical portion 413 to the bottom surface of the first conical portion 411 and the distance from the bottom surface of the second cylindrical portion 423 to the bottom surface of the second conical portion 421 is smaller than the length of the through hole 321, so that the first cylindrical portion 413 and the second cylindrical portion 423 are prevented from contacting in the through hole 321; the first taper pin 41 and the second taper pin 42 have the same shape and size.

It should be noted that when half of the extension of the spring 5 is equal to the length of the edge of the first square portion 412, the taper pin 4 cannot be retained in the through hole 321, and the taper pin 4 needs to be replaced.

The output shaft 6 is provided with two shifting forks which are respectively a first shifting fork 61 and a second shifting fork 62, and the first shifting fork 61 and the second shifting fork 62 are consistent in forming size and just opposite to each other. First U-shaped opening 611 is formed in first shifting fork 61, second U-shaped opening 621 is formed in second shifting fork 62, in order to match with the conical surface of taper pin 4, the side surfaces of first U-shaped opening 611 and second U-shaped opening 621 are both inclined surfaces, that is, the side surfaces of first U-shaped opening 611 and second U-shaped opening 621 are splayed, and the large opening of the splayed structure faces the space between first shifting fork 61 and second shifting fork 62. The first conical portion 411 is connected to the first U-shaped opening 611 in a matching manner, and the second conical portion 421 is connected to the second U-shaped opening 621 in a matching manner.

It is noted that the surface of the U-shaped opening is also shot-blasted to increase the wear resistance of the inclined surface of the U-shaped opening.

It should be noted that the distance between the inner side surfaces of the first fork 61 and the second fork 62 is greater than the length of the slider 3, and the height of the U-shaped opening is large enough to offset the relative offset of the axis of the output shaft 6, so as to prevent the taper pin 4 from being disengaged from the upper end of the U-shaped opening during the rotation of the output shaft 6.

In this embodiment, the ball screw 1 drives the screw nut 2 to make a linear motion along the axial direction of the ball screw 1, and it can be known through stress analysis that, in the process that the screw nut 2 drives the taper pin 4 to make a linear motion, the thrust F output by the taper pin 4 to the shifting fork of the output shaft 6 is perpendicular to the inclined matching surface, the larger the taper angle α of the taper pin 4 is, the larger the axial component force F2 of the taper pin 4 is, the smaller the radial component force F1 is, so that the smaller the effective output torque of the output shaft 6 is, and the lower the transmission efficiency is. In this embodiment, the taper of the taper pin 4 is 1: 3.

In the embodiment, the matching surface of the taper pin and the shifting fork is designed to have a certain inclination angle, the taper pin is installed on the sliding block as an independent part, the large-stiffness springs are arranged in the middles of the taper pins on the two sides, the taper pins are always tightly propped against the inclined matching surface of the shifting fork, and after the taper pins are worn due to long-term work, the taper pins move outwards under the action of the elastic force of the springs and are always in contact with the inclined surface of the shifting fork, so that the matching gap caused by wear is eliminated, and the service life of the device is prolonged.

The working process of the slider fork device of the embodiment is as follows: the ball screw 1 is driven to rotate by external power, so that the screw nut 2 and the slide block 3 do linear motion along the axis direction of the ball screw 1. The mechanism for supplying external power to the roller screw 1 is a motor. The slide block 3 drives the output shaft 6 to rotate, the first taper pin 41 is in line contact with the first U-shaped opening 611, the second taper pin 42 is in line contact with the second U-shaped opening 621, and a gap is generated after the cylindrical pin and the U-shaped opening are worn for a long time, so that the spring 5 arranged between the first taper pin 41 and the second taper pin 42 is in a compressed state, the two taper pins are driven to move outwards along the through hole 321 under the elastic force action of the spring 5, and the wear gap between the taper pins and the U-shaped opening is eliminated.

In the embodiment, the taper pin 4 is always contacted with the inclined upper line of the U-shaped opening through the elasticity of the spring 5, so that the abrasion gap is eliminated, and the reliable operation of the device is ensured.

The conical pins arranged at the two ends of the sliding block are always in contact with the inclined matching surface of the shifting fork under the action of the elastic force of the spring, so that the matching gap generated by abrasion of the sliding block shifting fork during long-term operation is eliminated, and the service life of the device is prolonged; the sliding block shifting fork device is simple and compact in structure and convenient to use.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.