JPS6053266A - Planetary frictional transmission - Google Patents

Abstract

PURPOSE:To enable the transmission of torque in both directions of rotation, by providing a side of a retaining disc with a recess having a prescribed obliqueness angle to a ball in both the directions of rotation. CONSTITUTION:A recess 32a having a prescribed obliqueness angle theta to a ball 27 in both directions of rotation is provided on a side of a retaining disk 32. Since the disk 32 and the ball 27 are put in pressure contact with each other at the obliqueness angle theta in both the directions of rotation of a driver, torque can be transmitted in both the directions of rotation.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an improvement of a planetary friction type transmission. [Prior Art] A conventionally known device of this type is shown in Figs. 1 and 2. Explain according to the following. In the figure, (1) is a high-speed shaft that is connected to a drive source such as an electric motor and rotates, and (1a)
The thrust receiver connected to one end of this high-speed shaft (1) is a body,
(1b) indicates that this thrust receiver has eight pressure receiving recesses formed at equal intervals on the inner end surface of the body (1a), and (2) indicates that the above-mentioned high-speed shaft (1)
through the key (3), and the thrust receiver is fitted to the body (1) through the key (3).
The thrust receiver facing a) at a predetermined distance is a plate, (2a
) indicates that the thrust receivers of the plate (2) are eight pressure receiving recesses formed at equal intervals on the surface facing the eight pressure receiving recesses (1b) of the body (1a), and (4) is the above-mentioned With a retaining ring fitted to the high-speed shaft (1), the thrust receiver is connected to the drive source side of the plate (2).
0 is prevented. (51 (6) refers to a pair of sun rollers having a conical ladder shape, which are loosely fitted opposite to each other between the thrust receiver body (1a) of the high speed shaft (1) and the thrust receiver plate (2). , (5a) and (6a) are the pair of sun rollers (51 (
6) The above thrust receiver is a body (1a) and the above thrust receiver is a plate (2
), each of eight pressure receiving recesses formed at equal intervals on the surface facing the eight pressure receiving ports WS (lb) and (2a), (7) is fitted between the pressure receiving recesses (1b) and (5a). The eight copper balls inserted (8) are the eight copper balls inserted between the pressure receiving recesses (2a) and (6a), and (9) is the pair of sun rollers (5).
(6) Four hollow planetary rollers having a barrel-shaped outer shape are circumscribed on the outer circumferential surface of the planetary roller (9) and are arranged at equal intervals. hollow metal, O
v is a planetary roller shaft loosely fitted on the inner periphery of this metal 00 and rotatably supports the planetary roller (9); 0 is a low-speed shaft connected to a load; the high-speed shaft (1), the sun roller (5) It is arranged on the same axis as (fl). (1
2a) is a flat plate part connected to the low-speed shaft a''4, into which the planetary roller shaft 0 is fitted.The target is inscribed in the outer peripheral surface of each of the four planetary rollers (9). (18a) is a keyway engraved on the outer edge of this fixing ring a:j; A mating casing (14a)
is a keyway engraved on the inner circumferential surface of this housing αΦ, and O12 is a key inserted into the keyways (18a) and (14a) to prevent rotation of the fixing ring 01. Ol is a retaining ring fitted to the inner circumferential surface of the housing a, which engages with one end of the fixing ring 03 to prevent the fixing ring 03 from moving in the axial direction.

Next, the operation of the device configured as described above will be explained. Now, when the high-speed shaft (1) is rotated by the drive source with the high-speed shaft (1) as the input shaft and the low-speed shaft @ as the output shaft, the high-speed shaft (1)
), the thrust receiver body (1a), the retaining ring (4), and the thrust receiver plate (2) rotate in one body. The thrust receiver is a body (1a
), when the thrust receiver rotates the plate (2), the copper balls (7) (8)
The rotational force is transmitted from the pair of sun rollers (5) (6) to the planetary rollers (9) to the fixing ring 01 via. In this case, the fixed ring a3 is connected to the housing a4 with the key Qf9, so the planetary roller (9) is connected to the sun roller (5) (6).
It is circumscribed and inscribed with the fixed ring α1, and rotates and revolves around its own axis, and the low-speed shaft rotates at a rotation speed of 1g1 of the revolution of the planetary lens (9) to drive the load. In this case, the thrust applied to the sun roller (5) (6) changes depending on the magnitude of the load, but if the load is large, the thrust receiver is the body (1a) - copper ball (7) - sun p - roller ( 5), and the thrust receiver is plate (2) → copper ball (8) →
The thrust of the sun roller (6) increases, and therefore the contact pressure between the sun roller (5) (6) and the planetary roller (9) increases, and the planetary roller (9) and the fixed ring 0: The contact pressure with j also increases, and a large rotational force is transmitted to the low-speed shaft (2), driving a large load.

Conventional devices of this type are constructed and operated as described above, and therefore not only require high-precision machining of each component, but also have the drawbacks of complex structures, large numbers of parts, and large devices. Ta.

Furthermore, since the planetary roller is supported by the planetary roller shaft, it is supported on a cantilever, resulting in an uneven load, which has the disadvantage that sufficient torque cannot be transmitted.

Furthermore, the specific gravity of the gear change by this device is as follows: 1 = Scratch = Hearing = 10 times However, Nl: N rotation number of input shaft (1) N2: Output shaft 0 rotation number D■: Inner diameter of fixing ring 01 Ds: The outer diameter of the sun rollers (5) and (6), and the range of the speed ratio i was narrow, about 8 to 5. In addition, since each contact was a point contact, high Hertzian surface pressure was generated, resulting in a product with low transmission capacity.

[Embodiments of the invention]

This invention has been made in an attempt to eliminate such drawbacks, and one embodiment of the invention will be described below with reference to FIGS. 8 to 5.

In Fig. 8, the wheel is an input shaft that is connected to a drive source and rotates, ■]) is a conical wheel provided at the end of the input shaft (E), and (A) is a bearing (E) and (C). input shaft (through
(2) is a housing fixed to the end face of the bracket (A); (E) is a rolling shaft (hereinafter referred to as a fixed plate) fixed to the housing (C); It is made of elastic thin steel plate. (B) is a steel ball that is pressed against the fixed plate (C) of the conical wheel, 2) is the output shaft, and the wire is the output shaft (2) via the bearing OIOη.
a second bracket (2) supporting the housing and fixed to the other end (2) of the retaining disc (2) fixed to the output shaft);
(hereinafter referred to as carrier), (82a) G! career)
This is a concave groove that is provided on the side surface of the steel ball and contacts the steel ball (a) at an angle of inclination with respect to the circumferential direction.

Figure 4 is a side view of the carrier (viewed from the input shaft side), Figure 5
The figure is a sectional view taken along the line ■-V in FIG. 4, and the four-part groove (82JL) provided in the carrier (2) has an inclination angle θ in the circumferential direction with respect to both rotational directions. (82b) is the four-part groove (a2a
) shows isocentric lines.

Next, the contact of the steel ball (a) will be explained with reference to FIG.

In Figure 6, the center 0 of the steel ball ■ is taken as the origin, and the rotation axis (
1) The axial direction is the X axis, the center O of the steel ball slope is the origin, the radial direction is the two axes, the pressure contact point of the conical wheel η and the steel ball (goods) is A, the concave groove (82a) in the carrier) and the steel ball) at B
, the pressure contact point between the fixed plate and the steel ball (goods) is 0, each pressure contact point A%B
, O are the pressing forces as NA, NB, and NC.

Further, pressure contact point B has an angle θ with respect to the X axis, and the OB line is set as the η axis.

In other words, pressure contact points A and O of the @I4 ball (goods), conical wheel QD, and fixed plate (e) are on the x-2 plane, and pressure contact point B with the carrier (2) is on the X-Z plane. It is located on the η-2 plane tilted by an angle θ, and is wedged in the circumferential direction at eight pressure contact points A%B and O due to the rotational force in one direction from the circles na* and a°C. However, even though the steel ball (A) is wedged in the circumferential direction, it is free to rotate about the η axis, and the IC of the conical wheel Q! One rotational force results in planetary motion of revolution and rotation, and the carrier moves on the conical surface of the fixed plate (a), decelerating the carrier movement.

This speed reduction ratio is as follows, and a wide range of speed change ratios can be obtained by changing the positions of the eight pressure contact points A%B and 0.

However, the number of revolutions of the conical wheel Q......NI
Number of (b) transfers to N carriers...N 0
071g1 Radius from rotary axis to point A...R1 Radius from co-rotating axis (e) to point 0...R2 Radius from η axis of steel ball (a) to point A...r□steel 0 from the η axis of the sphere (a)
Radius to point...The 12th order operation will be explained. When the rotational force is not transmitted from the drive source, the fixed plate (
The steel ball (goods) is pushed toward the output shaft side by the pressing force due to the elasticity (e), and the pitch of the steel ball comes into contact with the recessed groove (82a) at its deepest point.

Next, when the input shaft is activated, (b) transmission force is applied, and the pressing force of each contact point A, B, and O changes. The axial thrust of the contact point B due to the rotational force overcomes the pressing force due to the elasticity of the fixed plate, and the steel ball slides toward the input shaft. At this time, the steel ball moves along the slope of the four-part groove (82a). When the axial thrust due to the rotational force and the elastic pressing force are balanced, torque is transmitted at the contacts A, B, and 0 with a pressing force corresponding to the rotational force. The rotation of the input shaft (E) is then decelerated by the planetary motion of the steel balls (A) and is transmitted to the output shaft (). Further, the drive source is pressed against the drive source at an inclination angle θ in both left and right rotations, and torque can be transmitted in both rotations.

〔Effect of the invention〕

As described above, according to the present invention, the steel ball, the conical wheel, the fixed plate,
By using a carrier having recessed grooves having inclination angles in both rotational directions and a mechanism in which the fixing plate is elastic, it is possible to provide a small, simple, and inexpensive transmission capable of left and right rotation with a small number of parts. Further, the force acting on the steel ball is a balance of forces at eight points, and a pressing force corresponding to the rotational force is generated, which is the minimum pressing force necessary for frictional transmission. The gear ratio can be arbitrarily selected by simply changing the position of the 8 quintillion contact points, and the gear ratio can be changed over a wide range.

Furthermore, in addition to making the fixing plate elastic, the same effect can be achieved by making the conical wheel and carrier elastic, allowing for a wide contact surface and a small size that can transmit large torque. Since it is balanced, it has the advantage of being easy to manufacture.

Note that even if the input and output shafts are reversed, the operation is the same, except that the gear ratio becomes a reciprocal.

[Brief explanation of the drawing]

Part 1 is a partial side view of a conventional planetary friction transmission, Part 2
The figure is a sectional view taken along the line nu in FIG. 1, FIG. 8 is a sectional view showing an embodiment of the present invention, FIG. 4 is a side view of the carrier, and FIG. FIG. 6 is an explanatory diagram of the operation of the present invention. In the figure, (E) is the input shaft, Q is the conical wheel, @) is the flaket, (C) is the housing, (A) is the fixed plate, (I) is the steel ball, and (I) is the output shaft. ) is a carrier. In the drawings, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa

Claims (3)

[Claims] (1) A conical wheel, a rolling wheel arranged concentrically with the conical wheel and having a conical surface on its inner periphery, a sphere that comes into contact with the conical surface of the conical wheel and the rolling wheel, and a predetermined inclination with respect to the sphere and both rotational directions. A planetary friction transmission device, characterized in that a holding disk has a side surface that comes into contact with an angle, and any one of the conical wheel, the rolling wheel, and the holding disk is made of an elastic member. (2) The planetary friction type transmission according to claim fR1, characterized in that the angle of inclination is in the range of 4 to 1 angle. (3) A planetary friction transmission according to claim 1 or 2, characterized in that any one of a conical wheel, a rolling wheel, and a holding disk is fixed.