CN101526132A - Slide block mechanism for reducing transmission backlash of rack and pinion - Google Patents

Abstract

The invention provides a slide block mechanism for reducing transmission backlash of rack and pinion. The mechanism comprises a pinion, a rack, a decelerator and a motor, the pinion is mounted on the output shaft of the decelerator, the motor or the decelerator is connected with the decelerator, the decelerator is mounted on the slide block, the slide block is glidingly mounted on a bracket and has one movement freedom degree only, the bracket is mounted on a movable member, and a compression spring is provided between the slide block and the bracket. The invention provides a new method, which is safe and reliable and is convenient for mounting, for reducing lateral clearance of the rack and the pinion; the compression spring is employed to minimize the distance between the pinion, which is mounted on the output shaft of the decelerator on the slide block, and the rack, which is meshed with the pinion, thus realizing the objective of reducing the backlash.

Description

Carriage Mechanism for Reducing Backlash in Rack and Pinion Transmission

(1) Technical field

The invention relates to a mechanism for reducing the backlash of gears and racks connected to the output shaft of a reducer.

(2) Background technology

Due to manufacturing and installation errors, as well as to compensate for thermal deformation and provide space for storing lubricating oil, the rack and pinion meshing needs to leave a minimum backlash; the traditional method is to use double-plate gears to control the gap to reduce the rack and pinion meshing The method of empty return, this method of reducing empty return increases the processing cost and installation cost, and the double-plate gear must be adjusted regularly according to the usage; another common method is to design and process the gear shaft of the installed gear as an eccentric shaft, through The relative position of the gear and the rack is controlled to control the backlash, thereby effectively reducing backlash, but the structure of the eccentric shaft is difficult to ensure the mutual position for a long time under the condition of variable load. A new method to reduce backlash and backlash in rack and pinion drives is needed in practice.

(3) Contents of the invention

The object of the present invention is to provide a carriage mechanism that is easy to install, does not need to be adjusted, and is reliable and safe to reduce backlash in rack and pinion transmission.

The purpose of the present invention is achieved like this:

It includes gears, racks, reducers, and motors. The gears are installed on the output shaft of the reducer, the motor is connected to the reducer, the reducer is installed on the carriage, and the carriage is slidably installed on the bracket and the carriage has only one degree of freedom of movement. , the bracket is installed on the moving body, and a compression spring is arranged between the sliding frame and the bracket.

When the sliding frame is slidably installed on the bracket, the convex groove on the sliding frame is installed in the groove on the bracket, and the sliding frame is pressed into the groove on the bracket by the pressing plate fixed on the bracket.

A compression spring is arranged between the sliding frame and the bracket, and a guide rod is installed on the sliding frame, and the compression spring is sleeved on the guiding rod.

The invention provides a safe, reliable and easy-to-install new method for reducing the backlash of rack and pinion transmissions. Compression springs are used to make the gear mounted on the output shaft of the reducer on the carriage and the gear rack meshed with it The distance is the smallest to achieve the purpose of reducing backlash.

In the present invention, the combination of the gear, the reducer and the motor is installed on the carriage, and the carriage is slidably mounted on the bracket. In this way, the distance from the gear to the rack is reduced to the minimum, so as to achieve the purpose of reducing the backlash of the rack and pinion meshing with each other, and finally play the role of reducing backlash.

(4) Description of drawings

Fig. 1, Fig. 2, Fig. 3 are schematic diagrams of different directions of the overall structure of the present invention respectively.

(5) Specific implementation methods

The present invention is described in more detail below in conjunction with accompanying drawing example:

1-3, the main components of the present invention include: motor 1, reducer 2, bracket 3, moving body 4, slider 5, rack installation body 6, rack 7, pressure plate 8, pressure plate 9, gear 10 , carriage 11, guide rod 12, compression spring 13, screw group 14, screw group 15, screw group 16, screw group 17, screw group 18, screw group 19, screw group 20, screw 21, pressure piece 22 and slide rail twenty three.

Install the pressure piece 22 on the output shaft of the reducer 2 through the screw 21, fix the gear 10 on the output shaft of the reducer 2 through the key and the pressure piece 22, install the gear 10 on the output shaft of the reducer 2, and make the gear 10 opposite The speed reducer has only one degree of freedom of rotation around its axis of rotation; the speed reducer 2 is fixed on the carriage 11 through the screw group 20, and the carriage 11 is installed on the concave groove processed on the bracket 3 through the convex groove processed on the carriage 11. In the groove, and press the carriage 11 into the groove through the pressure plate 8 and the pressure plate 9 fixed on the bracket 3, so that it has only one degree of freedom of movement, the guide rod 12 is installed in the hole processed on the bracket 3, and uses a compression spring 13 The slide frame 11 is pushed towards the tooth rack engaged with it by the guide bar 12; the tooth bar 7 is fixed on the rack mounting body 6 by the screw group 18, and the slide rail 23 is also fixed on the rack mounting body 6 by the screw group 19, The moving body 4 is fixed to the slider 5 through the screw group 17, and the bracket 3 is fixed to the moving block 4 through the screw group 16; at the same time, the slide rail 23 and the slider 5 only have one degree of freedom of movement along the direction of the rack 7, when the motor 1 When the rotation occurs, the rack and pinion will mesh and move, so that the carriage 11, the bracket 3, the pressure plate 8, the pressure plate 9 and the moving body 4 will drive the slider 5 to move along the slide rail 23, because the compression spring 13 will pass the guide rod 12 The carriage is pushed towards the rack 7 meshing with it, so that the distance between the rotation axis of the gear 10 and the rack 7 is the shortest during the relative movement between the gear 10 and the rack 7, so as to reduce the number of gears and racks meshing with each other. The purpose of backlash in the transmission process is ultimately to reduce backlash.

The slide rails and slide blocks in the present invention only represent the restricted degrees of freedom, not just the slide rails and slide blocks in the strict sense; the power source mentioned in the present invention is a motor, and the power source therein can also be a hydraulic motor ; In addition, the hydraulic motor can also be directly connected to the gear.

Claims (3)

1. A carriage mechanism for reducing backlash in rack and pinion transmission, which includes a gear, a rack, a reducer, and a motor, and is characterized in that the gear is installed on the output shaft of the reducer, the motor is connected with the reducer, and the reducer Installed on the sliding frame, the sliding frame is slidably installed on the support and the sliding frame has only one degree of freedom of movement, the support is installed on the moving body, and a compression spring is arranged between the sliding frame and the support. 2. The carriage mechanism for reducing backlash in rack-and-pinion transmission according to claim 1, characterized in that: said carriage is slidably installed on the bracket, and the convex groove on the carriage is installed on the groove on the bracket Inside, and press the carriage into the groove on the bracket through the pressure plate fixed on the bracket. 3. The carriage mechanism for reducing backlash in rack and pinion transmission according to claim 1 or 2, characterized in that: a compression spring is set between the carriage and the bracket, and a guide rod is installed on the carriage , the compression spring is set on the guide rod.

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