CN2818919Y

CN2818919Y - Rotary precisive nut and screw auxiliary equipment

Info

Publication number: CN2818919Y
Application number: CN 200520041866
Authority: CN
Inventors: 缪冬生
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-05-22
Filing date: 2005-05-22
Publication date: 2006-09-20
Anticipated expiration: 2015-05-22

Abstract

The utility model relates to a rotary precision nut and screw pair. An inner ring of a rolling ring and an inner hole of a positioning block are tightly matched with a mandrel and connected into integration to form a rolling body. The structure of the rolling ring is similar to the structure of a rolling bearing, and the rolling ring and the axis of a screw form a slope angle, so that one side of the outer ring skirt edge of the rolling ring is engaged with the tooth surface of the screw. Two rolling bodies are oppositely fastened on the left side of a seat plate through bolts, and two more rolling bodies which are symmetrical to the two rolling bodies fastened on the left side of the seat plate are fastened on the right side of the seat plate through bolts. A rolling nut is composed of 2-4 rolling bodies which are symmetrically arranged. The positioning block is provided with sliver-shaped bolt holes. When the utility model is assembled, the outer ring skirt edges of the rolling rings positioned in the left and the right two sets of rolling bodies are closely attached to the tooth surfaces of the left and the right sides of the screw, and the engaging gaps approach to zero. The utility model has the advantages of high motion precision, small frictional resistance, easy processing and low cost, and can satisfy the specific requirements of the motion precision and the resistance force of instruments with electromechanical integration such as numerical control devices, remote control devices and mechanical arms or robots.

Description

Rolling type accurate nut-screw pair

Technical field the utility model relates to a kind of transmission device, particularly a kind of rolling type accurate nut-screw pair.

Background technique is 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.

The summary of the invention the purpose of this utility model provides a kind of rolling type accurate nut-screw pair that does not have the linear reciprocating motion idle stroke.

The utility model is realized 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, 2-4 the rolling element composition ball nut 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 group or more ball nut can be set, staggering mutually symmetrically 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 the rolling type accurate nut-screw pair that the utility model provides 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 utility model 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 further specifies the utility model below in conjunction with drawings and Examples.

Fig. 1 is a structural representation of the present utility model.

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

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

Fig. 4 is the layout plan of 3 groups of ball nuts.

Specific embodiments embodiment 1 is as Figure 1-3: a kind of rolling type accurate nut-screw pair, and the endoporus of the inner ring of its 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, 2-4 the rolling element composition ball nut 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 group ball nut can be set, their seat board is positioned at parallel to each other or vertical plane, helps improving the power and the precision of transmission.Fig. 4 is the layout plan that is provided with 3 groups of ball nuts.

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, 2-4 the rolling element composition ball nut that symmetry is installed.

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.

3. a kind of rolling type accurate nut-screw pair according to claim 1 is characterized in that: 1-4 group ball nut can be set, and staggers mutually symmetrically in the plane at their seat board (2) place.