JPS6053264A - Planetary frictional transmission - Google Patents

Abstract

PURPOSE:To widen the range of transmission ratio, by composing a planetary frictional transmission of a conical wheel, a rolling ring, a ball and a retaining disk, and using an elastic member to push the retaining disk on the ball. CONSTITUTION:A planetary frictional transmission is composed of a conical wheel 21, a rolling ring 26, a ball 27 and a retaining disk 32, which is pushed on the ball by an elastic member 33. Forces act to three portions of the ball 27 as the forces balance to one another. The force for pushing the disk 32 on the ball 27 corresponds to the turning force of the disk and has the minimum magnitude required for frictional transmitting action. The transmission ratio can be optionally set by only changing the positions of the three portions. As a result, a wide range of transmission ratio is achieved.

Description

[Detailed description of the invention] [Technical field of invention] It is something.

[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 a motor to rotate, (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 body (1a) at a predetermined interval is a plate, and (2a) is the thrust receiver of the plate (2). 8 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. (5) +6) is a pair of sun rollers having a conical ladder outer 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 (5) and (6a).
) The above thrust receiver is a body (1aJ and the above thrust receiver is a plate (2)
Eight pressure receiving recesses (lb) and (2a) are formed at equal intervals in opposing parts, and (7) is inserted between the pressure receiving recesses (1b) (5aJ). 8 copper balls, (
8) is inserted between the pressure receiving recesses (2a) and (6a).
copper balls, (9) are the pair of sun rollers (++) (
4 circumscribed on the outer peripheral surface of 61 and arranged at equal intervals.
Hollow planetary rollers with a barrel-shaped outer shape, On is a hollow metal fitted to the inner circumferential surface of the planetary roller (9), 01
) is loosely fitted on the inner circumference of this metal O0, and the planetary roller (9) is ll1l! A planetary roller shaft that supports one rotation freely,
αa is a low-speed shaft connected to the load, and the high-speed shaft (1),
It is arranged on the same axis as the sun rollers (5) and (6). (12a) is a flat plate portion coupled to the low-speed shaft (6), into which the planetary roller shaft Op is fitted. 01 is a fixing ring (1,8a
) is a keyway engraved on the outer edge of this fixing ring 0″4, 0◆ is a housing into which the fixing ring (13) is fitted into the inner circumferential surface, (14a l is the inner circumferential surface of this housing a4 The key path 00 is engraved on the key path (18a) and the key inserted in the key path (14a) to prevent the fixing ring 01 from rotating. A retaining ring fitted on the inner circumferential surface engages with one end of the fixing ring collar to prevent the fixing ring α1 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 (b) as the output shaft, the thrust receiver connected to the high-speed shaft (1) becomes the body (1PL) and the stopper. Ring (4
), the plate (2) of the thrust receiver rotates as one body. The thrust receiver is the body (1a), and when the thrust receiver plate (2) rotates, the steel ball (7) (
8), the rotational force is transmitted to the pair of thick @4-ra (5) (6) → planetary 4-ra (9) → fixed ring Mi 1. In this case, the fixed ring 01 is connected to the housing (b) with the key 01J, so the planetary roller (9) is the sun roller (5).
It is circumscribed by (6) and inscribed by fixed ring 0.1, and rotates and revolves around its axis, and the low-speed shaft (2) rotates at the revolution speed of the planetary four-ra (9) and drives the load. In this case, the thrust applied to the sun roller (51(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) - The sun roller (5) and the thrust receiver increase the thrust of the plate (2) - the copper ball (8) - the sun roller (6), and therefore the sun roller (5) (6) and the planetary roller (9) increases, and the contact pressure between the planetary roller (9) and the fixed ring also increases, and a large co-rotating force is transmitted to the low-speed shaft (6), driving a large load. become.

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 as follows: N1: Number of revolutions of the input shaft (1) N2; Number of revolutions of the output shaft 04 DT: Inner diameter of the fixed ring 01 1) S: of the sun roller (5) (6) The gear ratio i had a narrow range of about 8 to 5.

[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, (■) is an input shaft that is connected to a drive source and (B) rotates, (C) is a conical wheel provided at the end of the input shaft (1), (A) is a bearing (E) ( C) is the first bracket that supports the input shaft (A) through the housing, (E) is the housing fixed to the end face of the bracket (A), and (E) is the rolling shaft (hereinafter referred to as (referred to as the fixed plate), (2) is a steel ball that is pressed into contact with the conical wheel () and the fixed plate (E), (2) is the output shaft, (28a) is a spline shaft provided on the output shaft (to), (2) is the bearing (to) 0η
The second bracket, which supports the output shaft through the housing (c) and is fixed to the other end of the housing (c),
8a) A retaining disc (hereinafter referred to as carrier) that is fitted with &1 and movable in the axial direction (82a) &1 is provided on the side surface of the carrier (a) and has an inclination angle with respect to the circumferential direction. The four-part groove that contacts the steel ball (A), (to) is the carrier (
(28b) is a part of a stopper that restricts the movement of (28b) to the output side of the carrier (28b).

Figure 4 is a side view of carrier 0 seen from the input shaft side, Figure 5
The figure is a sectional view taken along the line v-V in FIG. 4, and the recessed groove (82a) provided in the carrier (2) has an inclination angle θ in the circumferential direction with respect to both rotational directions. 182b) shows isosurface lines within the four-part groove (a2a).

Next, the contact between the steel ball and the steel ball will be explained with reference to FIG. In Figure 6, the center O of the steel ball (A) is the origin, the axial direction of the rotating shaft (E) is the X axis, the center 0 of the steel ball (B) is the origin, the radial direction is the 2 axes, and the conical wheel is (on the steel ball) to the pressure contact point A
, the pressure contact point between the four-part groove (82a) of the carrier (2) and the steel ball (a) is B, the pressure contact point between the fixed plate (g) and the steel ball slope is 0, and the pressing force at each pressure contact point A%B, 0. Let be NA, Ns, and Nc. In addition, pressure contact point B has an angle θ with respect to the X axis,
Let the OB line be the η axis.

In other words, pressure contact points A and 0 of the steel ball), conical wheel Q1), and fixed plate (e) are on the X-2 plane, and pressure contact point B with the carrier (2) is at an angle with respect to the X-Z blood. It is located on the η-2 plane tilted by θ, and the pressure contact point A is
, B, will wedge in the circumferential direction at 008 points. However, even though the steel ball is wedged in the circumferential direction, it is free to rotate around the η-axis, and due to the (b) transmission force of the conical wheel Q]), it can revolve and rotate on its own axis. It becomes a planetary motion, moving on the conical surface of the fixed plate (to),
carriers) will be slowed down.

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

, NTN rl R2'=NOUT=”-stone-×π However, the (b) rotation number of the conical wheel (goods)...
・Rotation speed of NIN carrier (2)・・・・・・N
Radius from oUT rotation axis (A) to point A...R1 radius from rotation axis (1) to point 0...R2 steel ball) Radius from η axis to point A...rl steel ball 0 from the η axis of (goods)
Radius to point...The 12th order operation will be explained. When no rotational force is transmitted from the drive source, the carrier is pushed toward the input shaft by the pressing force of the elastic body, and the steel ball is pushed toward the deepest part of the recessed groove (82a). We meet in places.

Next, when the input shaft is activated, rotational force is applied to each contact point A.
, B, the pressing force of 0 changes. The axial thrust of the contact point B due to the rotational force overcomes the pressing force of the elastic body, and the carrier force slides toward the output shaft. At this time, the carrier (A) moves until it comes into contact with the stopper M (28b), and the steel ball (A) moves along the inclined surface of the four-part groove (82a). When the carrier) comes into contact with a part of the stopper (28b), contact A is applied with a pressing force corresponding to the rotational force.

Torque transmission occurs at P,0. and input shaft (a)
The IP1 rotation of is slowed down by the planetary motion of the steel ball,
It will be transmitted to the output shaft wheel. In addition, 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 at the same time.

〔Effect of the invention〕

As described above, according to the present invention, the steel ball, the conical wheel, the fixed plate,
By means of a mechanism constituted by a carrier having a four-part groove having an inclination angle in both directions of rotation and an elastic body, it is possible to provide a transmission capable of both left and right rotation, which has a small number of parts, is small, simple, and inexpensive. Further, the force acting on the steel ball is a balance of forces at eight points, and generates a pressing force corresponding to the rotational force and the minimum pressing force necessary for frictional transmission. 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.

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 drawings]

Figure 1 is a partial side view of a conventional planetary friction transmission;
The figure is a sectional view taken along the line nn 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. 5 is a sectional view taken along the line V-■ in FIG. 4. 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, (A) (2) is the bracket, (A) is the housing, (E) is the fixing plate, (
(a) is the steel ball, (b) is the output shaft, (b) is the carrier, and (to) is the elastic body. 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 comprising: a retaining disc having angularly abutting sides; and - an elastic body pressing any one of the conical wheel, rolling wheel, and retaining disc against the sphere. (2) The planetary friction type transmission according to claim 1, characterized in that the angle of inclination is in the range of 2° to 15°. (3) Claim 1 or 2 characterized in that any one of a conical wheel, a rolling wheel, and a holding disc is fixed.
The planetary friction transmission described in .