CN100447451C

CN100447451C - Rolling type accurate nut-screw pair

Info

Publication number: CN100447451C
Application number: CNB2005100261765A
Authority: CN
Inventors: 缪冬生
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-05-22
Filing date: 2005-05-22
Publication date: 2008-12-31
Anticipated expiration: 2025-05-22
Also published as: CN1696536A

Abstract

The present invention relates to a rolling type accurate screw-nut screw-rod pair. The present invention is characterized in that an inner ring of a rolling ring and an inner hole of a positioning block are tightly combined on a spindle which connects the inner ring and the inner hole into a rolling body. The structure of the rolling ring is similar to that of a rolling bearing; an inclined angle is formed between the rolling ring and the axis of a screw rod and enables one side of the skirt edge of the outer ring of the rolling ring to be meshed with the tooth surface of the screw rod. Two rolling bodies are tightly, oppositely and correspondingly fixed to the left side of a seat board through screw bolts. Corresponding to the two rolling bodies, two other rolling bodies are fixed to the right side of the seat board through screw bolts. Two to four rolling bodies which are arranged correspondingly form a rolling screw nut. The positioning block is provided with a long screw hole. When the present invention is assembled, the skirt edge of the outer ring of the rolling ring arranged in the left and the right pairs of rolling bodies can be tightly attached to the tooth surfaces of the left and the right sides of the screw rod so that a mashed gap nears to zero. The present invention has the advantages of high motion precision, small friction resistance, simple processing and low cost and can satisfy the requirements of electromechanical integrative instrument and apparatus, particularly the special requirements for digital control, remote control, mechanical hands or robots to moving precision and resistance.

Description

Rolling type accurate nut-screw pair

Technical field

The present invention relates to a kind of transmission device, particularly a kind of rolling type accurate nut-screw pair.

Background technique

In mechanical transmission, rotatablely moving of normal employing nut-screw adjutant prime mover changes linear reciprocating motion into, but the gap of common nut-screw synetion frictional resistance and their engagement is bigger, and can not adaline electrical integrated instrument and equipment is to the requirement of kinematic accuracy.Existing ball screw has reduced frictional resistance, but the idle stroke that the gap when to-and-fro motion commutates causes is still bigger, and kinematic accuracy is little, and difficulty of processing is big, the cost height.

Summary of the invention

The purpose of this invention is to provide a kind of rolling type accurate nut-screw pair that does not have the linear reciprocating motion idle stroke.

The present invention realizes by following technical proposal: a kind of rolling type accurate nut-screw pair, and the inner ring of its rolling ring and the endoporus of positioning block are a tight fit on the mandrel, and both are connected as a single entity, and form rolling element; The structure and the rolling bearing of rolling ring are close, and the axis of it and screw rod has an inclination angle, makes the flank engagement of its shirt rim, outer ring one side and screw rod; Two rolling elements are by the corresponding in opposite directions left side that is fastened on seat board of bolt, and other has two rolling elements to be fastened on the right side of seat board symmetrically by bolt and the former, 2 or 4 rolling element composition ball nuts that symmetry is installed.Positioning block is provided with microscler bolt hole, during assembling, the shirt rim, rolling ring outer ring of two groups of rolling elements about being arranged in should be close to the flank of tooth of the screw rod left and right sides, makes its back lash level off to zero.According to transmission power, precision be driven the quantity of parts, 1-4 or more ball nut can be set, staggering mutually in the plane at their seat board place, is beneficial to improve the power and the precision of transmission.

With traditional nut-screw pair or ball screw parafacies ratio, the back lash of rolling type accurate nut-screw pair provided by the invention levels off to zero, does not have idle stroke when linear reciprocating motion commutates, the kinematic accuracy height, and all be the contact of rolling, frictional resistance is little, process easyly, cost is lower.So the present invention can satisfy the specific (special) requirements to kinematic accuracy and resistance of instrument and equipment, particularly numerical control, remote control, mechanism hand or the robot of electromechanical integration.

Description of drawings

The present invention is further described below in conjunction with drawings and Examples.

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

Fig. 2 is the plan view of Fig. 1.

Fig. 3 is the left view of Fig. 2.

Fig. 4 is the layout plan (axial schematic representation as shown in Figure 3) of 3 ball nuts.

Embodiment

Embodiment 1 is as Figure 1-3: the endoporus of the inner ring of rolling ring 4 and positioning block 6 is a tight fit on the mandrel 5, and both are connected as a single entity, and forms rolling element; The structure and the rolling bearing of rolling ring 4 are close, and the axis of it and screw rod 1 has an inclination angle, makes the flank engagement of its shirt rim, outer ring one side and screw rod 1; Two rolling elements are by the corresponding in opposite directions left side that is fastened on seat board 2 of bolt 3, and other has two rolling elements to be fastened on the right side of seat board 2 by bolt 3 symmetrically with the former, 2 or 4 rolling element composition ball nuts that symmetry is installed.Positioning block 6 is provided with the long strip bolt hole, is convenient to regulate the center line of two rolling elements; During assembling, the shirt rim, rolling ring outer ring of two groups of rolling elements about being arranged in should be close to the flank of tooth of the screw rod left and right sides, make its back lash level off to zero, when linear reciprocating motion commutates, not have idle stroke, the kinematic accuracy height.Seat board by bolt be driven parts and be connected.The screw rod 1 of rotation rolls by the outer ring that the shirt rim that is in contact with it drives rolling ring 4, and drive rolling element, ball nut and seat board 2 and the coupled parts that are driven and do reciprocating linear motion, all be the contact of rolling therebetween, frictional resistance is little; When screw rod when rotation commutation, owing to do not have the gap with the ball nut of its engagement, ball nut oppositely moves under the condition of idle stroke not having immediately.

Embodiment 2: according to the needs of transmission power or precision, 2-4 ball nut can be set, staggering mutually in the plane at their seat board 2 places, helps improving the power and the precision of transmission.Equilateral triangles are formed on three planes at seat board 2 places of 3 ball nuts shown in Figure 4, and 3 ball nuts and seat board 2 thereof stagger mutually.

Claims

1. rolling type accurate nut-screw pair, it is made up of screw rod and ball nut, it is characterized in that: the endoporus of the inner ring of rolling ring (4) and positioning block (6) is a tight fit on the mandrel (5), and both are connected as a single entity, and forms rolling element; The structure and the rolling bearing of rolling ring (4) are close, and the axis of it and screw rod (1) has an inclination angle, makes the flank engagement of its shirt rim, outer ring one side and screw rod (1); Two rolling elements by bolt (3) in opposite directions correspondence be fastened on the left side of seat board (2), other has two rolling elements to be fastened on the right side of seat board (2) by bolt (3) symmetrically with the former, the rolling elements that 2 or 4 symmetries are installed are formed ball nuts.

2. a kind of rolling type accurate nut-screw pair according to claim 1 is characterized in that: positioning block (6) is provided with the long strip bolt hole, during assembling, the shirt rim, rolling ring outer ring of two groups of rolling elements about being arranged in should be close to the flank of tooth of the screw rod left and right sides.