CN102748461A

CN102748461A - Zero-clearance gear transmission device

Info

Publication number: CN102748461A
Application number: CN2012102565197A
Authority: CN
Inventors: 王平易; 达明元
Original assignee: Ningxia Yinchuan Dahe CNC Machine Co Ltd
Current assignee: Ningxia Yinchuan Dahe CNC Machine Co Ltd
Priority date: 2012-07-24
Filing date: 2012-07-24
Publication date: 2012-10-24

Abstract

The invention relates to a gear transmission device, in particular to a zero-clearance gear transmission device; the zero-clearance gear transmission device comprises a gear case body, an input shaft, an output shaft and a middle shaft which are mounted in the gear case body; two gears on the middle shaft are engaged with the gears on the input shaft and the output shaft mutually; the gear transmission device is characterized in that the gears which are on the middle shaft and are engaged with the input shaft and the output shaft are composed of two gears with same sizes and same modules; according to two gears composed of two combinations, one gear is fixedly connected with the middle shaft; the other gear is sleeved on the middle shaft in an empty manner; a circular disc capable of staggering angles is fixed on one side of the empty sleeved gear on the middle shaft; and a tension spring is mounted between the empty sleeved gear and the circular disc capable of staggering the angles. According to the invention, the zero-clearance gear transmission device is characterized by reasonable structure, stable transmission and good precision retain ability; and therefore, high-precision zero-clearance gear output transmission is realized truly; and the zero-clearance gear transmission device is specifically suitable for precise machine tools.

Description

No gap gear drive

Technical field

The present invention relates to a kind of gear drive, particularly do not have the gap gear drive.

Background technique

NC machine tool feed system, particularly continuous control system require position and two aspects of speed of feed movement are realized automatic control simultaneously, so just require the machine driven system of numerical control machine tool that high orientation precision and transmission response characteristic will be arranged.NC machine tool feed system is owing to need frequent break-in; If there is the gap in Transmitted chains middle gear transmission, after positive and negative switching-over, will there be error in the actual rotational angle of output shaft between the and instruction system; Also will make feed movement lag behind instruction system, thereby influence machining accuracy.Therefore something must be done to eliminates the gap in the gear driving pair, to improve the transmission accuracy and the Location accuracy of numerical control machine tool.Eliminate the gear transmission gap at present many kinds of methods are arranged; As: equipment gear transmission device, helical gear and the Straight Bevel Gear Drive device in tunable center method, anti-gap; Said apparatus is one of subject matter that influences the numerically-controlled precise machine tool accuracy because structure is comparatively complicated, the Gear Processing required precision is higher, stable drive and precision stability can't guarantee.

Summary of the invention

The objective of the invention is to overcome the defective that existing technology exists, provide a kind of and in frequent commutation process, can effectively eliminate the gap between the gear, the transmission stability and the good no gap gear drive of precision stability of continuous running when guaranteeing switching-over.

For realizing the foregoing invention purpose; Technological scheme of the present invention is: a kind of no gap gear drive; Comprise gear housing, be installed in input shaft, output shaft and jack shaft in the gear housing; Wherein two gears on the jack shaft respectively with input shaft and output shaft on gear be meshing with each other, it is characterized in that on above-mentioned jack shaft with input shaft and output shaft pitch wheel it being to form, in two gears that above-mentioned two combine by two sizes, Gear combination that modulus is identical; One of them gear is fixedly connected with jack shaft; Another gear sky is enclosed within on the jack shaft, and the stagger disk of usefulness of angle is fixed on free gear one side on the jack shaft, between free gear and angle stagger the disk of usefulness, extension spring is installed.

Being enclosed within gear and angle on the jack shaft at above-mentioned sky staggers and all is installed with the bearing pin of fixedly extension spring on two opposing sides of disk of usefulness; The center line that bearing pin and the angle on the gear on the jack shaft of being enclosed within sky staggers between the bearing pin on the disk that uses forms 60-120 ° angle with the center of circle of jack shaft as basic point in the space, the two ends of extension spring are separately fixed on two bearing pins.

2-4 pairs of the bearing pins that gear and the angle on the jack shaft of being enclosed within above-mentioned sky staggers and all be installed with fixedly extension spring on two opposing sides of disk of usefulness all are equipped with extension spring on every pair of bearing pin.

The present invention utilizes two sizes, thin gear that modulus is identical to be sleeved on side by side to form a gear on the jack shaft; And one is fixedly linked with jack shaft in the two thin gears, and another sky is enclosed within on the jack shaft, utilizes to be fixed on disk and the extension spring that the angle on the jack shaft staggers usefulness; Make sky be enclosed within the minute angle of thin gear rotation on the jack shaft; To eliminate the gap of gear between being meshing with each other, satisfied NC machine tool feed system, particularly the high-precision requirement of numerically-controlled precise machine tool feed motion.That this device has is rational in infrastructure, stable drive, precision stability are good, has really realized the gear output transmission of high-precision no gap, is particularly suitable for using on the precision machine tool.

Description of drawings

Accompanying drawing 1 is transmission principle figure of the present invention;

Accompanying drawing 2 is jack shaft partial structurtes schematic representation of the present invention;

Accompanying drawing 3 is the A-A sectional view of accompanying drawing 2 of the present invention.

Embodiment

Like Fig. 1,2, shown in 3, input shaft 2, output shaft 6 and jack shaft 10 are installed in gear housing 9, two gears are installed on jack shaft, this two gear respectively with input shaft and output shaft on gear be meshing with each other.Two gears on the jack shaft all are to be formed by two sizes, Gear combination that modulus is identical; One of them gear 5 is fixedly connected through key with jack shaft; Another gear 11 skies are enclosed within on the jack shaft; The stagger disk 12 of usefulness of angle is fixed on free gear one side on the jack shaft through key, on free gear and angle stagger two opposing sides between the disk of usefulness, all is installed with 3 fixedly bearing pins 4 of extension spring, and extension spring 3 is installed on the two relative bearing pins.

Size according to driving torque; The quantity of extension spring can be chosen in 2-4; The center line that free gear and angle stagger between the two corresponding bearing pins on the disk that uses forms 60-120 ° angle with the center of circle of jack shaft as basic point in the space, the selection of angle is that the size according to required pulling force determines.

During use; Corresponding gear is meshing with each other on gear 1 on the input shaft 2 and the jack shaft; Another gear on the jack shaft and the gear 8 on the output shaft are meshing with each other; Because free gear is through the rotatable minute angle of extension spring, just can eliminate the gap that is meshing with each other between the gear, the error that is installed in like this between the instruction system of encoder 7 and numerical control machine tool on the output shaft 6 will reduce greatly.

Claims

1. no gap gear drive; Comprise gear housing, be installed in input shaft, output shaft and jack shaft in the gear housing; Wherein two gears on the jack shaft respectively with input shaft and output shaft on gear be meshing with each other; It is characterized in that going up with input shaft (2) and output shaft (6) pitch wheel at above-mentioned jack shaft (10) is to be formed by two sizes, Gear combination that modulus is identical; In two gears that above-mentioned two combine, one of them gear (5) is fixedly connected with jack shaft, and another gear (11) sky is enclosed within on the jack shaft; The stagger disk (12) of usefulness of angle is fixed on free gear one side on the jack shaft, between free gear and angle stagger the disk of usefulness, extension spring (3) is installed.

2. no gap according to claim 1 gear drive; It is characterized in that on gear (11) that above-mentioned sky is enclosed within (10) on the jack shaft and angle stagger two opposing sides of disk (12) of usefulness, all being installed with the bearing pin (4) of fixedly extension spring; The center line that bearing pin and the angle on the gear of (10) on the jack shaft of being enclosed within sky staggers between the bearing pin on the disk (12) of usefulness is that basic point forms 60-120 ° angle in the space with the center of circle of jack shaft, and the two ends of extension spring (3) are separately fixed on two bearing pins.

3. no gap according to claim 2 gear drive; It is characterized in that above-mentioned sky is enclosed within (4) 2-4 pairs of the bearing pins that the gear of (10) on the jack shaft (11) and angle stagger and all be installed with fixedly extension spring on two opposing sides of disk (12) of usefulness, all is equipped with extension spring (3) on every pair of bearing pin.