CN102494108A - A Backlash Elimination Mechanism for a Rack and Pinion Transmission System - Google Patents

Abstract

The present invention discloses a clearance elimination mechanism for a gear rack transmission system, wherein the output gear shaft (5, 22) is composed of two pieces, and the input gear (15) is respectively connected to the output gear shaft (5, 22) through two gear transmission lines with the same transmission ratio; each gear transmission line is provided with a transmission gear (14) on the input shaft (12), and the transmission gear (14) is a helical gear; the input shaft (12) is installed on a box body (26) and a box cover (25) through two radial bearings, and an input shaft axial sliding fine adjustment mechanism is provided on one end of the input shaft (12). The above technical solution solves the problem of reverse clearance of the gear rack transmission of the machine tool, is simple to adjust, has a compact structure, and improves the transmission accuracy of the machine tool.

Description

A Backlash Elimination Mechanism for a Rack and Pinion Transmission System

technical field

The invention belongs to the technical field of metal cutting machine tools, and relates to a transmission system of the machine tool. More specifically, the invention relates to a clearance elimination mechanism of a rack and pinion transmission system.

Background technique

In the feed transmission of machine tools, rack and pinion transmission is commonly used, and there is a backlash during reverse movement. In order to eliminate the gap, many methods are used. However, in the prior art, the effect of eliminating gaps is not ideal, and some structures are complex and too large; some adjustments and operations are troublesome.

Contents of the invention

The invention provides a backlash elimination mechanism of a rack and pinion transmission system, the purpose of which is to eliminate the backlash of the rack and pinion transmission.

In order to achieve the above object, the technical scheme that the present invention takes is:

The backlash elimination mechanism of the rack and pinion transmission system provided by the present invention, the rack and pinion transmission system is provided with a box body and a case cover, and the rack and pinion transmission system includes an input gear, an output pinion shaft meshing with each other, and rack, the input gear is installed on the input shaft, the output gear shaft is two pieces, and the input gear is respectively connected to the output gear shaft through two gear transmission routes with the same transmission ratio; The above-mentioned gear transmission route is provided with a transmission gear respectively on the said input shaft, and it is a helical gear; One end of the input shaft is provided with an input shaft axial slip fine-tuning mechanism.

The fine-tuning mechanism for the axial sliding of the input shaft is provided with an adjustment threaded hole support, an adjustment thread disc, a disc spring and a thrust ball bearing at the end of the input shaft. The connection relationship is: one end of the thrust ball bearing and The adjusting threaded disc is in contact, and the other end is in contact with one end of the disc spring; the other end of the disc spring is in contact with the stepped end surface of the input shaft.

An adjustment pad is provided on the outer surface of the box, and the thickness direction of the adjustment pad is in the same direction as the length direction of the rack.

The invention adopts the above technical scheme, solves the backlash problem of the rack and pinion transmission of the machine tool, has simple adjustment, compact structure, and improves the transmission precision of the machine tool.

Description of drawings

The following is a brief description of the contents expressed in the drawings of this manual and the marks in the drawings:

Fig. 1 is a structural representation of the present invention;

Fig. 2 is an enlarged schematic view of the disc spring, the flange and the flange with scale in Fig. 1 .

Labeled in the figure:

1. Large gear of output gear shaft, 2. Spacer, 3. Tapered roller bearing, 4. Spacer, 5. Output gear shaft, 6. Lock nut, 7. Tapered roller bearing, 8. Intermediate gear shaft, 9. Middle large gear, 10. Lock nut, 11. Disc spring, 12. Input shaft, 13. Thrust ball bearing, 14. Transmission gear, 15. Input gear, 16. Bearing sleeve, 17. Adjusting threaded disc, 18 , Adjusting threaded hole support, 19, middle gear shaft, 20, middle gear, 21, expansion sleeve, 22, output gear shaft, 23, output gear shaft gear, 24, cylindrical roller bearing, 25, box cover, 26, casing, 27, adjusting pad, 28, rack.

Detailed ways

The specific implementation of the present invention will be described in further detail below by describing the embodiments with reference to the accompanying drawings, so as to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concepts and technical solutions of the present invention.

The structure of the present invention as shown in Fig. 1 and Fig. 2 is a clearance elimination mechanism of a rack and pinion transmission system. The rack and pinion transmission system is provided with a casing 26 and a case cover 25. The rack drive system includes an input gear 15 mounted on the input shaft 12 , an output pinion and a rack 28 meshing with each other.

In order to solve the problems existing in the current known technology described in the background technology part of this specification and overcome its defects, and realize the invention purpose of eliminating the backlash of the rack and pinion drive, the technical solution adopted by the present invention is:

As shown in Figure 1, in the backlash elimination mechanism of the rack and pinion transmission system provided by the present invention, the output gear shaft is two pieces, which are respectively the output gear shaft 5 and the output gear shaft 22, and the input gear 15 passes through Two gear transmission routes with the same transmission ratio are respectively connected with the output gear shaft 5 and the output gear shaft 22; the gear transmission routes are respectively provided with a transmission gear 14 on the input shaft 12, and are helical Gear; the input shaft 12 is installed on the box body 26 and the box cover 25 through two radial bearings, and one end of the input shaft 12 is provided with an input shaft axial sliding fine-tuning mechanism.

Through the micro-adjustment of the input shaft 12 in the axial direction, and through the action of the helical gear of the transmission gear 14, the steering of the two gear transmission lines is slightly rotated in the opposite direction, eliminating the two-way backlash.

The above technical solution solves the backlash problem of the rack and pinion transmission of the machine tool, has simple adjustment, compact structure, and improves the transmission accuracy of the machine tool.

The transmission gear 14 is axially locked on the input shaft 12 through the lock nut 10 .

As shown in Figure 1, the two gear transmission routes are:

(1): input gear 15; input shaft 12; transmission gear 14; intermediate large gear 9; intermediate pinion 8; intermediate shaft gear; output pinion large gear 1; output pinion 5.

(2): input gear 15; input shaft 12; transmission gear; intermediate large gear 20; intermediate pinion 19; intermediate shaft gear; output pinion large gear 23; output pinion 22.

In this double rack and pinion transmission system, the rotating speed is input by the input gear 15, and then transmitted to the output pinion shaft 5 and the output pinion shaft 22 respectively by the intermediate pinion shaft 8 and the intermediate pinion shaft 19 through the above two transmission lines, and drives The rack 28 moves linearly.

Wherein, the two ends of the intermediate pinion shaft 8 are installed on the box body 26 and the box cover 25 through the tapered roller bearing 7 respectively. The intermediate gear shaft 19 also adopts the same supporting structure.

The output gear shaft bull gear 1 is axially locked on the output gear shaft 5 with a lock nut 6 .

The output end of the output pinion shaft 5 is supported on the box body 26 through two tapered roller bearings 3; the spacer 4 is axially limited between the two tapered roller bearings 3. The support structure of this end of the output pinion shaft 22 is the same as this.

The output pinion gear 1 and the tapered roller bearing 3 are axially limited by the spacer 2 .

The opposite end of the output end on the output gear shaft 22 is radially supported by a cylindrical roller bearing 24 . The supporting structure of the opposite end of the output end on the output pinion shaft 8 is the same as this.

The output gear shaft bull gear 23 is fixedly installed on the output gear shaft 22 using an expansion sleeve 21 .

As shown in Figure 2, the input shaft axial slip fine-tuning mechanism is:

The fine-tuning mechanism for axial sliding of the input shaft is provided with an adjustment threaded hole support 18, an adjustment threaded disk 17, a disc spring 11 and a thrust ball bearing 13 at the end of the input shaft 12. The connection relationship is: the thrust One end of the ball bearing 13 is in contact with the adjusting threaded disc 17 , and the other end is in contact with one end of the disc spring 11 ; the other end of the disc spring 11 is in contact with the stepped end surface of the input shaft 12 .

Wherein, a bearing sleeve 16 is also provided between the disc spring 11 and the thrust ball bearing 13 . The bearing sleeve 16 also plays the role of radial positioning.

A hexagonal head is provided on the adjusting threaded disc 17, so as to facilitate the adjustment with manual adjustment tools.

An adjustment pad 27 is arranged on the outer surface of the box body 26 , and the thickness direction of the adjustment pad 27 is in the same direction as the length direction of the rack 28 .

The adjustment method of above-mentioned regulating mechanism is:

Assemble the gear shafts, gears and bearings in the gear box, including giving the disc spring 11 a certain preload, and adjust the adjustment pad 27 on the side of the box body 26, so that the output pinion shaft 5 contacts one side of the teeth of the rack 28, Fix the position of the box body 26;

Rotate the adjusting threaded disk 17 engraved with the scale, press the disc spring 11 down, adjust another output pinion 22, make the other side of the tooth of the pinion 22 contact with the rack 28, and eliminate the gap.

The present invention has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods, as long as various insubstantial improvements are adopted in the method concept and technical solutions of the present invention, or there is no improvement Directly applying the conception and technical solutions of the present invention to other occasions falls within the protection scope of the present invention.

Claims (3)

1. the elimination clearance mechanism of a gear rack transmission system; Described gear rack transmission system is provided with casing (26), case lid (25); Described gear rack transmission system comprises input gear (15), intermeshing output gear axle (5,22) and tooth bar (28); Described input gear (15) is installed on the input shaft (12); It is characterized in that: described output gear axle (5,22) is two, and described input gear (15) is connected with described output gear axle (5,22) respectively through the gear transmission route of two same gear ratios; Described gear transmission route respectively is provided with a driving gear (14) on described input shaft (12), and is helical gear; Described input shaft (12) is installed on described casing (26) and the case lid (25) through two radial bearings, and an end of described input shaft (12) is provided with input shaft axial slip micro-adjusting mechanism.

2. according to the elimination clearance mechanism of the described gear rack transmission system of claim 1; It is characterized in that: described input shaft axial slip micro-adjusting mechanism is to establish in the end of input shaft (12) to regulate tapped hole bearing (18), adjusting screw thread dish (17), dish spring (11) and thrust ball bearing (13); Its annexation is: an end of described thrust ball bearing (13) contacts an end in contact of the other end and dish spring (11) with adjusting screw thread dish (17); The other end of described dish spring (11) contacts with the step end face of input shaft (12).

3. according to the elimination clearance mechanism of the described gear rack transmission system of claim 1, it is characterized in that: establish spacer (27) on described casing (26) outer surface, the length direction of the thickness direction of described spacer (27) and described tooth bar (28) in the same way.

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