JPS6053265A - Planetary frictional transmission - Google Patents

Abstract

PURPOSE:To enable the transmission of large torque and facilitate the manufacturing of a planetary frictional transmission, by using an elastic member to constitute one of a conical wheel, a rolling ring and a retaining disk. CONSTITUTION:A planetary frictional transmission is composed of a conical wheel 21, a rolling ring 26, a ball 27 and a retaining disk 32. One of the conical wheel 21, the rolling ring 26 and the retaining disk 32 is made of an elastic member. As a result, large contact surfaces are provided so that large torque can be transmitted though the planetary frictional transmission is compact. Even if there is a small mismatching, the shares of torque are almost balanced to one another due to the elasticity of the elastic member. For that reason, the manufacturing of the planetary frictional transmission is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] This invention relates to an improvement in a planetary friction type transmission.

[Prior art]

A conventionally known device of this type will be explained with reference to FIGS. 1 and 2. In the figure, (1) is a high-speed shaft that is connected to a drive source such as an electric motor and rotates, (1a) is a thrust receiver connected to one end of this high-speed shaft (1), and (1)
b) This thrust receiver has eight pressure receiving recesses formed at equal intervals on the inner end surface of the body (1a), and (2) is fitted to the high speed shaft (1) through a key (3), and The thrust receiver is the body (1a)
The thrust receiver facing the plate (2a) at a predetermined interval is a plate, and the thrust receiver of the plate (2) is located on the surface facing the eight pressure receiving recesses (1b) of the body (1a). 3 formed in the interval
The pressure receiving recesses (4) are retaining rings fitted to the high speed shaft (1), and the thrust receiver prevents the plate (2) from moving toward the drive source side. (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 f51 (6
), the above thrust receiver is a body (1a) and the above thrust receiver is a plate (2)
The eight pressure receiving recesses (7) are formed at equal intervals on the opposite sides of the eight pressure receiving recesses (lb) and (2a), respectively, and the eight pressure receiving recesses (7) are fitted between the pressure receiving recesses (1b) and (5a). 8 copper balls, (
8) is 3 inserted between the pressure receiving recesses (2a) and (6a).
copper balls, (9) are the pair of sun rollers (5) (6
), and OQ is a hollow planetary roller fitted on the inner circumferential surface of the planetary roller (9). The metal ση is loosely fitted to the inner circumference of this metal Ql, and the planetary roller (9
), the planetary roller shaft (2) is a low-speed shaft connected to a load, and the high-speed shaft (11), the sun roller (
It is disposed on the same axis as 51(6). (12a)
is a flat plate portion connected to the low-speed shaft (2), into which the planetary roller shaft θυ is fitted. al is a fixing ring inscribed in the outer circumferential surface of each of the four planetary rollers (9) and whose inner circumferential surface is formed in a concave curved shape, and (18a) is carved on the outer edge of this fixing ring. The keyway, 0 荀 is the casing into which the fixing ring σ1 is fitted on the inner peripheral surface, (14a) is this casing 0
The key path engraved on the inner circumferential surface of →, OQ is the key path above (1
8a) and (14a) prevent rotation of the fixing rings a and 11. OQ is a retaining ring fitted to the inner circumferential surface of the housing 0, and is engaged with one end of the fixing ring 03 to prevent the fixing ring a1 from moving in the axial direction.

Next, the operation of the device configured as described above will be explained. Now, with the high speed shaft (1) as the input shaft and the low speed shaft 04 as the output shaft, if the high speed shaft (1) is rotated simultaneously by the drive source, the high speed shaft (
The thrust receiver connected to 1) has a body (1a), a retaining ring (4),
The plate (2) of the thrust receiver rotates as one body. The thrust receiver is the body (1
a), the thrust receiver is the plate (2) or when it rotates at the same time, the copper ball (7) (8
), the Ig1 rolling force is transmitted to the pair of sun rollers (5) (6) -> planetary roller (9) -> stationary ring mill 1.

In this case, the planetary roller (9) is connected to the fixed ring a housing 041 with the key 4, so the planetary roller (9) is connected to the sun roller (5) (
6), circumscribes it, inscribes it with the fixed ring 03, rotates and revolves,
The low speed shaft (2) is at the revolution speed of the planetary roller (9) (b)
This will drive the rotating 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 roller (5). , and the thrust receiver increases the thrust of the plate (2) - copper ball (3) - sun roller (6), and therefore the contact pressure between the sun roller (5) (6) and the planetary roller (9) increases. , and the contact pressure between the planetary roller (9) and the fixed ring 4 also increases, and a large rotational force is transmitted to the low-speed shaft 02, 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 gear ratio i according to this device is: i=]set-Dr±''=1,000 degrees 1N2 1. s DS However, Nl: Number of rotations of the input shaft (1) N2 ° Number of rotations of one river at 0 of the output shaft DI: Inner diameter of the fixed ring o1 DS: The diameter of the sun roller (51 (fl)), and the gear ratio i The range was narrow, about 8 to 5. Also, 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, gradient is an input shaft connected to a drive source and rotated, a! η is a conical wheel installed at the end of the input shaft (E), and (E) is connected to the input shaft (A) via the bearing rod (C).
The first bracket that supports the
The housing is fixed to the end face of the housing, and (E) is a rolling wheel (hereinafter referred to as a fixed plate) fixed to the housing, which is made of an elastic thin steel plate or the like. @ is the above conical wheel (
C) and the steel ball that is pressed against the fixed plate (C), (4) is the output shaft, and the shaft supports the output shaft (goods) via the bearing (OI), and the other end of the housing (to the housing) The second fixed bracket (82a) is provided on the side of the holding disc (hereinafter referred to as carrier) fixed to the output shaft (hereinafter referred to as carrier), and is inclined with respect to the circumferential direction. It is a four-part groove that has corners and contacts the above-mentioned sphere.

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

Next, the contact between the steel ball and the steel ball will be explained with reference to FIG. In Figure 6, the center 0 of the steel ball (a) is the origin, the axial direction of the N rotation axis (a) is the X axis, the center 0 of the steel ball (goods) is the origin, the radial direction is the 2 axes, and the conical wheel The pressure contact point of the steel ball (to the steel ball) is A, the pressure contact point of the four-part groove (82 and the steel ball) of the carrier (2), the pressure contact point of the fixed plate) and the steel ball (goods) is 0, each pressure contact point A ,
Let B, the pressing force at 0 be NA, NH, Nc.

In addition, 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, the steel ball (b) and the conical wheel Qη, Ii! Pressure contact points A and 0 of the il constant plate (e) are on the X-2 blood, and pressure contact point B with the carrier) is η-2 which is tilted by an angle θ on the X-Z plane.
It is wedged in the circumferential direction at eight pressure contact points A, B, and Q due to the unidirectional rotational force from the conical wheel IT. However, even though the steel ball is wedged in the cylindrical direction, it is free to rotate around the η-axis, and due to the rotational force of the conical wheel Q] Transferring on the conical surface of the board (c),
Carrier (2) will be decelerated.

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

, NIN' N (N = 1100 x M However, N number of rotations of all conical wheels......N
IN Career (2) 101 Turnover River...NoU
Radius from T rotation axis (e) to point A...R1 Radius from rotary axis to point 0...R2 From η axis of steel ball (goods) to A
Radius to point...rl Radius from the η-axis of the steel ball (goods) to point 0...12 Next, the operation will be explained. When no rotational force is transmitted from the drive source, the steel ball (A) is pushed toward the output shaft by the elastic pressing force of the fixed plate (E), and the steel ball (A) is pushed into the recessed groove (82a). We are connected at the deepest level.

Next, when the input shaft - is started, rotational force is applied to each contact point A,
The pressing force of B and 0 changes. (b) The axial thrust of contact B due to the transmitted force overcomes the pressing force due to the elasticity of the fixed plate.
The steel ball (goods) will slide toward the input shaft side. At this time,
The steel ball (a) moves along the slope of the recessed 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 (a) is decelerated by the planetary motion of the steel balls and transmitted to the output shaft (c).

〔Effect of the invention〕

As described above, according to the present invention, the steel ball, the conical wheel, the fixed plate,
By using a mechanism in which the carrier and fixing plate are elastic and have a four-part groove with an inclination angle, it is possible to provide a small, simple, and inexpensive transmission with a small number of parts. There is no need for a four-part groove, and the transmission force corresponding to the elastic force of the elastic body is transmitted.The force acting on the steel ball is the balance of forces at three points, and the pressing force equal to the fi1 rolling force is transmitted. And the minimum pressing force required for frictional transmission is generated.The gear ratio can be arbitrarily selected by simply changing the positions of the eight 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 obtained by making the conical wheel and carrier elastic, allowing for a wide contact surface, making it possible to transmit large torque with a small size, and even if there is some irregularity, each shared torque is elastic. Since it is almost 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 is the reciprocal.

[Brief explanation of the drawing]

Figure 1 is a partial side view of a conventional planetary friction transmission;
The figure is a sectional view taken along the line ■-■ in FIG. 1, FIG. 3 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, the handle is the input shaft, (C) is the conical wheel, (C) is the bracket, (C) is the housing, (C) is the fixed plate, and the slope is the steel ball.
) is the output shaft, and ) is the carrier. In the drawings, the same reference numerals indicate the same or corresponding parts. Agent Masuo Oiwa

Claims (5)

[Claims] (1) A conical wheel, a rolling wheel arranged concentrically with the conical wheel and having a conical surface on the inner periphery, a sphere that comes into contact with the conical wheel and the conical surface of the rolling wheel, and a holding disk that comes into contact with the sphere. 1. A planetary friction transmission, characterized in that any one of a conical wheel, a rolling wheel, and a holding disk is made of an elastic member. (2) The planetary friction type transmission according to claim 1, wherein any one of a conical wheel, a rolling wheel, and a holding disk is fixed. (3) A conical wheel, a rolling wheel arranged concentrically with the conical wheel and having a conical surface on the 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 circumferential direction of the sphere. 1. A planetary friction type transmission, characterized in that a holding disk has a side surface that abuts at an angle, and any one of the conical wheel, the rolling wheel, and the holding disk is made of an elastic member. (4) The planetary friction type transmission according to claim 8, characterized in that the angle of inclination is in the range of f to 1♂. (5) Claim 8 or 4, characterized in that any one of a conical wheel, a rolling wheel, and a holding disc is fixed.
The planetary friction transmission described in .