JPS61112854A - Speed reduction device with end face can - Google Patents

Abstract

PURPOSE:To make a power transmission device compact and light and enable self lock by providing annular cams between two rotary discs and rotating both the rotary discs through rotating bodies to reduce speed in the power transmission device of various industrial machines. CONSTITUTION:An input shaft 1 and an output shaft 2 are rotatably supported on a coaxial line and rotary discs 6, 7 are fixed to the input shaft 1 and the output shaft 2 so as to be placed oppositely with each other with a constant distance, and annular cams 8, 9 corresponding to their opposite faces are projected. The cam face 8a of the input side annular cam 8 is formed on tan inclined cam face inclining gently in the same direction continuously, and the cam face 9a of the output side annular cam 9 is formed in wave shape in the peripheral direction where mountainous unevenness is much continued. The contour shape of the cam thread of cam faces 8a, 9a is set by a diameter of a steel ball 11 of an intermediate body and the number of the balls and the balls are sequentially displaced in the axial direction and speed is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a speed reduction device with a novel speed reduction mechanism using a special cam, and the speed reduction device can be used as a power transmission device for various industrial machines. be.

Conventional technology Many types of reduction gears, including general-purpose gear reduction gears, are used as power transmission devices for various industrial machines, but in recent years, there have been many types of reduction gears used as power transmission devices for various types of industrial machinery. Planetary gear reducers with these characteristics have become widespread.

However, the standard type planetary gear reducer using involute tooth profiles requires a special structure in order to distribute the gear load uniformly among multiple planetary gears, and the structure is complex, making it difficult to design and manufacture. Not only is there a property, but also decomposition,
Inspection was also troublesome.

In addition, planetary gear reducers that use a cycloid tooth profile or a cycloid tooth profile (simple arc tooth profile) have a mechanism that decelerates and rotates the output shaft by eccentric rotation of a rotary disk fixed to the input shaft. The rotational balance is poor, and the outer diameter becomes large because the rotational balance is poor and the rotational speed is slowed down via bins or rollers arranged around the outer periphery of the rotary m (eccentric body).

Furthermore, since the efficiency is greatly influenced by the accuracy of assembly between each component, there are also manufacturing difficulties.

OBJECTS OF THE INVENTION The present invention has been made in view of the current situation, and provides a speed reduction device that is particularly compact, lightweight, and easy to manufacture by adopting a new speed reduction mechanism using a special cam. The purpose is to

Structure of the Invention In order to achieve the above object, the reduction mechanism adopted by the present invention includes a rotary disk 6 fixed to the end of the input shaft 1 and an end of the output shaft 2 disposed coaxially with the input shaft 1. A rotary disk 7 fixed to the rotary disk 7 is disposed facing each other at a certain distance in the axial direction, and annular cams 8 and 9 are provided opposite to the opposing surfaces of both the rotary disks 6 and 7. Fixed holding frame 1 placed in the middle
2, a plurality of rotating bodies 11.21 having circular rotating surfaces such as spheres or rollers are held in fixed positions and freely rotated, and each rotating body 11 is in contact with the input-side annular cam 8 and the output-side annular cam 9. , via the rotating body 11.

The rotary discs 6 and 7 are configured to rotate at a reduced speed between the end faces.

Effects of the Invention As described above, according to the present invention, the input side annular cam 8, the output side annular cam 9, and the rotating body 11 or 21 interposed therebetween, which constitute the speed reduction mechanism, are arranged along the same axis. Because it is installed, it is easier to manufacture than a reduction gear device using an eccentric rotation mechanism.
It is easy to assemble, has excellent rotational balance, and is highly efficient. In addition, since the rotating discs 6 and 7 are rotated at a reduced speed between the opposing end faces, the outer diameter can be reduced, and the overall size is small.
Lighter weight can be achieved. Furthermore, since the rotating body interposed in the middle is always in contact with both the annular cams 8 and 9 on the input and output sides, there is no bala crash and rotational force is not transmitted from the output annular cam 9 to the input annular cam 8. Since it cannot be transmitted, it has excellent effects such as reliable self-locking.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 is the input shaft, 2 is the output shaft, and both shafts 1 and 2 are Cousing 3
The input shaft 1 is rotatably supported on the same axis via a tapered roller bearing 4, and the support shaft portion 1a protruding from the tip of the input shaft 1 fits into the hollow portion 2aK1 provided at the tip of the output shaft 2, and the thrust It is pivotally supported via a ball bearing and needle roller bearing 5. Note that the output shaft 2 is formed into a hollow shaft.

6 is a rotary disk fixed to the end of the input shaft 1, 7 is a rotary disk fixed to the end of the output shaft 2, and both rotary disks 6.7 are arranged facing each other at a certain distance in the axial direction, and their opposing surfaces Annular cams 8 and 9 are provided in a protruding manner to face each other.

As clearly shown in FIG. 4, the cam surface 8a of the input-side annular cam 8 is formed into an inclined cam surface that gently slopes continuously in the circumferential direction, and the cam layout is such that the angle is 180 degrees. The entire circumference consists of a pair of cam curves. As clearly shown in FIG. 5, the cam surface 9a of the output-side annular cam 9 is formed in a wavy shape with a large number of concave and convex concavities continuous in the circumferential direction.

The contour shapes of the cam ridges 10 of the cam surfaces 8a and 9a are determined by the diameter and number of intermediate steel balls 11, which will be described later.

Steel balls (rotating bodies) 11 are held in a fixed holding frame 12 at fixed positions at fixed intervals in the local direction, and the number n thereof is only one from the number N of cam ridges 10 on the cam surface 9a. It's less. The fixed holding frame 12 is composed of an outer retainer 13 and an inner retainer 14. The outer retainer 13 is fixed to the casing 3 and is arranged between the annular cams 8 and 9, and each steel ball 11 is attached to each cam on the cam surface 9. They are disposed so as to contact the ridges 10 one after another with their positions shifted little by little, and also to contact the inclined cam surface 8. Note that since the inner retainer 14 is fixed to the casing 3 via the outer retainer 13,
A ball bearing 15 is interposed and supported between the shaft portion 1a, which is a rotating member.

The waveform cam surface 9a of the output side annular cam 9 is shown in FIGS. 4 and 5.
As shown in the figure, the steel ball 11 is formed by a deformed sinusoidal acceleration curve in which multiple rollers make contact. In the figure, d is the diameter of the steel ball, S
indicates a stroke. FIGS. 4 and 5 show the engagement state between the corrugated cam surface 9a of the output side annular cam 9, the inclined cam surface 8a of the input side annular cam 8, and the steel ball 11 designed under the following conditions.

Diameter (d) of steel ball 11: φ6.5 Stroke (s): 4am pitch circle
: φ95 Number of steel balls 11 (ff): 18 cam ridges 10
Number (N): 19 The cam surface 8a of the input-side annular cam 8 has a contour such that the steel ball 11, which rolls and moves on the wave-shaped cam surface 9a designed as described above, always comes into contact with it. Designed in shape.

Next, the operation of the speed reduction device configured as described above will be explained.

When the input shaft 1 rotates once, each steel ball 11 is sequentially displaced in the axial direction by the inclined cam surface 8a of the input side annular cam 8, and is pressed against the waveform cam surface 9aK of the output side annular cam 9.
The output-side annular cam 9 rotates in the opposite direction to the input shaft 1 by one pitch of the cam ridge 10 due to the tangential force of the contact pressure, and the rotational force is transmitted to the output shaft 2 by the rotary disk 7.

Therefore, the reduction ratio Ci) is 1-(II-N)/'N becomes.

In the example shown in FIGS. 4 and 5, N=19, -4. becomes.

6 and 7 show an example in which a row 221 is used instead of the steel ball 11 as the rotating body. In this case, each row 22
1 is in line contact with both cam surfaces 8a and 9a, which has the advantage that the transmitted torque can be increased compared to the case of steel balls 11. Note that both ends of the roller 21 are made spherical to reduce frictional resistance in rotational movement around the axis.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is a longitudinal sectional front view of a reduction gear device according to the invention, FIG. 2 is a longitudinal sectional view showing main parts of the reduction gear mechanism, and FIG. Fig. 4 is an exploded explanatory view of the speed reduction mechanism section, Fig. 5 is an explanatory view showing the contour shape of the main part of the cam surface of the output side annular cam, and Fig. 6 is a separate view along line -3. FIG. 7 is a vertical sectional view of the main parts of the speed reduction mechanism according to the embodiment, and is a view taken along line 7-7 in FIG. 6. 1...Input shaft 2...Output shaft 6.7 Rotating disk 8...Input side annular cam 9a7... Inclined cam surface 9...
... Output side annular cam 9a ... Waveform cam surface 10 Pa ... Cam Mountain 11 ... Steel ball (rotating body) 12 ... Fixed Holding frame patent applicant
Shinko Manufacturing Co., Ltd. Figure 7

Claims (1)

[Claims] 1. An input shaft (1) and an output shaft (2) are rotatably arranged on the same axis, and a rotary disk (6) fixed to the input shaft (1) and the output shaft ( The rotary disks (7) fixed to the rotary disks (7) are arranged facing each other at a certain distance in the axial direction, and the annular cams (8) and (9) are opposed to the opposing surfaces of both the rotary disks (6) and (7). The cam surface (8a) of the input-side annular cam (8) is continuously and gently inclined in the axial direction, and the cam surface (9a) of the output-side annular cam (9) is
) has a corrugated shape with a large number of continuous chevron-shaped irregularities in the circumferential direction, and a plurality of rotating bodies ( 11
) is held in a fixed position and freely rotates only, and the rotating body (11
), the number (n) is the cam peak (
10), which is one less than the number (N) of 10), and contacts the waveform cam surface (9a) one after another while shifting the position little by little, and also contacts the inclined cam surface (8a) of the input side annular cam (8). When the input shaft (1) rotates once, each rotating body (11) is sequentially displaced in the axial direction by the inclined cam surface (8a) of the input side annular cam (8), and the output is pressed against the waveform cam surface (9a) of the side annular cam (9),
The tangential force of the contact pressure causes the output shaft (2) to move against the cam crest (1).
1. A speed reduction device using an end cam, characterized in that it is configured to rotate in the opposite direction to the input shaft (1) by one pitch of 0). 2. The speed reduction device according to claim 1, wherein the rotating body is a sphere (11) or a roller (21).