JPS6347555A - Motion converter - Google Patents

Abstract

PURPOSE:To make it possible to change the amount of converted motion and the direction of motion by providing a rotating shaft, an outer ring concentric thereto, a planetary roller which supported on both ends by a pair of retainers respectively and make rolling contact with outer peripheral surface of the rotating shaft and inner peripheral surface of the outer ring and a retainer adjusting member. CONSTITUTION:A planetary roller 2 is given a skew angle by making the axial direction of the planetary roller 2 non-parallel to the axial direction of a rotating shaft 1 and an outer ring 3 through rotating one retainer 4 around the rotating shaft 1 of the other retainer with an adjusting member 5. Then, in a case when the planetary roller 2 acts as input part and the rotating shaft 1 acts as output part, the rotating shaft 1 is rotatingly driven around the axis thereof and at the same time, given a thrustwise drive force, makes a linear motion, too. And rolling contact between the planetary roller 2 and the rotating shaft 1 generates thrustwise drive force in proportion to the skew angle of the planetary roller 2 between the rotating shaft 1 and the planetary roller 2, thereby changes an amount of linear motion of the rotating shaft 1 per one rotation of the planetary roller 2.

Description

[Detailed description of the invention] 【Technical field] The present invention relates to a motion conversion device, and particularly to a motion conversion device for converting rotational motion into linear motion. [Background technology]

There is a gear type system that uses a rack and pinion to convert rotational motion into linear motion, but this has problems in that the positional accuracy in the direction of linear motion is not very good due to backlash, and it is also noisy. I have. There is a rolling guide system using a ball screw etc. that is superior in terms of noise resistance, but even this type uses preload to prevent backlash. This method requires a Pl structure and also has the problem that it is difficult to achieve precision in machining the ball grooves of the pongee. And no matter what type of system it is, conventional rotary direct M
In the A conversion device, it was not possible to switch the amount of linear motion per revolution or the direction of motion at the i position itself.

[Purpose of the invention]

The present invention has been made in view of these points, and its purpose is to provide a motion conversion device that has low noise, high positioning accuracy, and can change the amount of motion conversion and the direction of motion. It is on offer.

[Disclosure of the invention]

Therefore, the present invention has a rotating shaft, an outer ring disposed concentrically with the rotating shaft, and both ends of which are supported by a pair of retainers, and which roll into contact with the outer circumferential surface of the rotating shaft and the inner circumferential surface of the outer ring. It consists of an i-star roller and an adjustment member that rotates one retainer relative to the other around a rotating shaft, and is characterized in that the rotating shaft is movable in the thrust direction relative to both retainers and the outer ring. By making the axial direction of the rotating shaft and outer ring non-parallel with the axial direction of the planetary roller and giving a skew angle to the planetary roller, the rolling contact between the planetary roller and the rotating shaft can be made in the thrust direction according to the skew angle of the planetary roller. The driving force of the rotating shaft! ! This is generated between crawlers. Hereinafter, the present invention will be described in detail based on the illustrated embodiments.
an outer ring 3 disposed concentrically with the rotating shaft 1 and a plurality of planetary rollers 2 that roll into contact with the outer circumferential surface of the rotating shaft 1 and the inner circumferential surface of the outer ring 3.
It consists of a pair of retainers 4, 4 each having an elongated hole 40 for receiving the shaft 20 protruding from both ends of each planetary row 22, and an adjusting member 5 as shown in FIG. 4, 4 are connected by a plurality of universal joints t5 in which ball portions 46 and 46 at both ends are engaged with each retainer 4. The inner peripheral surface of the outer ring 3 has a tapered surface 30 that has the smallest diameter at the center in the axial direction and increases in diameter toward both ends. The adjusting member 5 includes a pair of pinions 53.53 that mesh with toothed portions 41.41 formed on the outer peripheral surfaces of both retainers 4, 4, and a pair of driven gears that rotate integrally with each pinion 53.53. It is composed of a bevel gear 52.52 and a drive bevel gear 51 that rotates in response to input from the operation input section 50 and meshes with both driven bevel gears 52.52.When the operator manually rotates the iso, the bevel gear 51.52 The pair of retainers 4, 4 are rotated in opposite directions around the rotating shaft 1 via the pinion 53, and twisted. Therefore, the axial direction of the planetary roller 2 is rotated mM1 and the outer ring 3
When both retainers 4.4 are positioned parallel to the axial direction of For example, if the outer ring 3 is fixed and rotational power is applied to the retainer 4, that is, the planetary roller 2, then the remaining one will output a speed-changed rotational output. Get out. However, as shown in FIGS. 3 and 4, the input from the adjustment member 5 causes one retainer 4 to be
If the planetary roller 2 is rotated around the axis of the rotating shaft 1, the axial direction of the planetary roller 22 is set non-parallel to the axial direction of the rotating shaft 1 and the outer ring 3, and a skinny angle θ is given to the planetary roller 2, then the planetary roller 2
When is the input part and the rotating shaft 1 is the output part, as shown in FIG. , also performs the straight #i movement. That is, in a state where the planetary roller 2 only rotates on its own axis, let F be the strong force that the planetary roller 2 gives to the rotational shaft 1. If a skew angle is given, the rotational force F is It does not act in the circumferential direction of , a thrust driving force Fax expressed by the following equation acts on the rotating shaft 1. Fax=F sinθ=μPsinθAs is clear from this equation, the thrust driving force Fax is equal to the skinny angle θ
The thrust driving force Fax acting on the rotating shaft 1 also changes as the skew angle θ changes, and the linear movement of the rotating shaft 1 for one rotation of the premature low 22!
l! 1Jfi changes. As shown in FIG. 5(b), when the skew angle θ is set in the opposite direction, even if the rotational direction of the planetary roller 2 is the same, the direction of the thrust driving force Fax acting on the rotating shaft 1 is reversed. However, the direction of linear movement of the rotating shaft 1 is reversed. In other words, even if the rotational direction and speed of the planetary roller 2 is constant, the linear momentum and movement direction of the rotating shaft 1 can be freely adjusted according to the setting of the skew angle θ. It is. The inner circumferential surface of the outer ring 3 is a tapered surface 30 as described above, and in the retainer 4, the 'M star crawler 2 shaft 2
Since the part that receives 0 is the elongated hole 40, the movement of the planetary row 22 when changing the skew angle θ is caused by the movement of the outer ring 3.
, the rotating shaft 1 or the retainer 4. In addition, here, the outer ring 3 is fixed, and the retainer 4
In the above description, the retainer 4 may be fixed, the outer ring 3 may be the input part, and the rotating shaft 1 may be the output part. Either one of them may be fixed for rotation around the axis, and the rotation axis 1 may be used as an input part, and the blocks of the outer ring 3 and the retainer 4 may be driven in the thrust direction according to the skinny angle θ of the planetary roller 2. In addition, W4 of the rotational speed of the retainer 4 and outer ring 3! If a fi function is added, the output section can be made to move only in the thrust direction.

【Effect of the invention】

As described above, since the present invention uses rolling contact (traction drive mechanism), accurate positioning can be performed with low noise and no backlash, and the direction and speed of rotational input are constant. However, the momentum and direction of the linear motion to be extracted can be freely adjusted according to the skew angle setting according to the anus material, and furthermore, it can be constructed by simply combining parts with simple shapes. It can be provided at low cost.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of the present invention with the adjustment member removed, Fig. 2 (aHb) is a vertical sectional view and side view of the same, and Figs. 3 (a) and (b) are skew angles of the same. Fig. 4 is a perspective view of the above with a skew angle given, and Fig. 5 (a) and (b) show the action between the planetary roller and the rotating shaft of the above. 1 is a plan view showing a rotating shaft, 2 a planetary roller, 3 an outer ring, 4 a retainer, and 5 an adjusting member. Agent Patent Attorney Ishi 1) Tsuyoshi 7L: Rotating shaft 2: Planetary cooler 3: Outer ring 4: Retainer 5: Section II member Fig. 1 Fig. 2 (b) Fig. 3

Claims (2)

[Claims] (1) A rotating shaft, an outer ring disposed concentrically with the rotating shaft, and a planetary roller whose ends are each supported by a pair of retainers and roll into contact with the outer circumferential surface of the rotating shaft and the inner circumferential surface of the outer ring. and an adjustment member for rotating one retainer relative to the other around a rotating shaft, the rotating shaft being movable in a thrust direction relative to both retainers and an outer ring. (2) The pair of retainers are connected by a universal joint, and the adjustment member is comprised of a pair of pinions that mesh with each retainer, a driven bevel gear provided on each pinion, and a driving bevel gear that meshes with both driven bevel gears. A motion converting device according to claim 1.