JPH0415314A - Drive transmission device - Google Patents

Abstract

PURPOSE:To simplify the holding structure and to enlarge the amount of allowable eccentricity by holding a pin and a roller on one shaft and the first rotating member, providing a long groove engaged with the above roller, a pin and a roller on the second member, and providing long grooves engaged with the above roller on the other shaft and the third rotating member. CONSTITUTION:Shafts 1a, 1b are fixed at positions separated from each other in the opposite directions, with an axis X as the center to a disc fixed to a shaft 30, and rollers 4, 5 are supported on the shafts through spacers 2, 3. Shafts 8a, 8b are provided on a disc 8 having long groove notches 8c, 8d engaged with the rollers 4, 5 similarly to the disc 1, and rollers 11, 12 are supported on the shafts through the spacers 9, 10. Long groove notches 15a, 15b engaged with the rollers 11, 12 are formed on a disc 15 connected to a shaft 31, and the above members are sequentially combined. Accordingly, the frictional resistance of drive transmission is small, and the holding structure on the drive side and on the driven side is simple, so that the assembling and maintenance control can be facilitated.

Description

[Detailed description of the invention] Founder Wataru Yutoru 1 The present invention relates to a drive transmission device that transmits driving force.

Figures 6 to 9 show examples of shaft couplings, which are small and inexpensive drive transmission devices that have been commonly used in the past.

Figure 6 shows an Oldham type shaft coupling that has been used since ancient times. This shaft joint is constructed by combining a disc having one-letter protrusions on both sides at right angles to each other, and a flange having a one-letter groove on both sides of the disc to fit with the one-letter protrusions. In this case, if there is eccentricity of the shaft, the protrusion absorbs this while sliding in the longitudinal direction within the groove. Therefore, the intermediate disc and the flanges on both sides slide against each other and operate in a complicated manner, generating a large reaction force in the radial direction, which causes the driven side to swing significantly, and is not suitable for high-speed rotation. Furthermore, since each component consists of three different types of discs, assembly, disassembly, and maintenance are troublesome, and there is a risk of parts being lost.

Figure 7 shows a leaf spring type shaft joint. With this structure, slight eccentricity and deviation can be absorbed by the deflection of the leaf spring, but the tension of the leaf spring generates a reaction force in the radial direction, similar to the Oldham type shaft coupling. Another problem is that the degree of freedom in the axial distance between the driving side and the driven side is extremely small.

FIG. 8 shows a coil spring type shaft joint, and this type has the same characteristics as the leaf spring type.

Figure 9 shows a tire-shaped rubber joint. With this structure, there is a relatively large degree of freedom in the axial distance between the driving side and the driven side, but since the absorption of the eccentricity angle depends on the elastic modulus of the rubber, a considerable reaction force in the radial direction is generated. That is, the greater the transmitted torque, the greater (harder) the elastic modulus must be, so the reaction force also increases in proportion to the transmitted torque.

As described above, in conventional shaft couplings, a large reaction force is generated in the radial direction, and there is little freedom in the axial distance between the driving side and the driven side, and special attention is required to the mounting accuracy and holding structure. did.

The present invention solves the above-mentioned problems in the prior art, and claims
The object of the invention is to provide a small and inexpensive drive transmission device that has a large tolerance and a small reaction force in the radial direction in an eccentric state. An object of the present invention is to provide a drive transmission device whose parts are easy to maintain and manage.

The present invention for solving the problems In order to solve the above problems, the invention of claim 1 includes a first member, a second member, and a third member that are rotated about one axis, and The first member includes a first pin and a second pin that are parallel to the first axis and are located apart from each other in radially opposite directions from the l-axis, and the first pin and the second pin are connected to the first roller and the second pin, respectively. 2 rollers are rotatably supported, and the second member is provided with a third pin and a fourth pin parallel to the l axis at positions apart from each other in a radial direction opposite to each other, and the third pin and the fourth pin are parallel to the l axis, and The pin and the fourth pin rotatably support the third roller and the fourth roller, respectively, and further include a first long groove and a second long groove that are long in the radial direction and guide the rotation of the first roller and the second roller, respectively. The third member includes a third long groove and a fourth long groove that are long in the radial direction and guide the rotation of the third roller and the fourth roller, respectively, and the third member includes the first member, the second member, and the third member. The invention of claim 2 is characterized in that the driving force is transmitted between the first member and the third member by sequentially arranging the first roller, the second roller, and the third member. The third roller and the fourth roller have flanges on the free end sides of the first pin, the second pin, the third pin, and the fourth pin, respectively, to prevent the second member and the third member from coming off. In addition to the features of the invention of claim 1, the invention of claim 3 further comprises a support shaft centered on the one shaft, and the first member, the second member, and the third member
Each member is provided with a hole having a diameter larger than the support shaft with the one wheel as the center, and the support shaft is passed through each of the holes to regulate the positions of the first member and the third member at a certain position. Features.

Operation Since the invention of claim 1 is configured as described above, the second member can be displaced in one direction with respect to the first member by rotating the roller within the long groove, and can be displaced in one direction with respect to the third member. However, as the roller rotates within the long groove, it can be displaced in the other direction. This allows displacement within a certain area. As a result, when the first member and the third member are connected to the driving side or the driven side, and there is eccentricity between the driving side and the driven side, the movement of the second member causes the first member to The third member can rotate eccentrically with respect to the third member without being swung around each other. In this case, the movement of the second member relative to the first member and the third member is
This is done smoothly by the slight rotation of the roller, so the second
The reaction force exerted by the member on the first member or the third member is extremely small. Therefore, transmission of large torque is also possible.

According to the invention of claim 2 or 3, in addition to the above-mentioned effect, by providing a collar on the roller to prevent the second member or the third member from coming off, or by preventing the second member or the third member from coming off, or through the holes provided in the first member or the third member. The first member to the third member are integrated by regulating the positions of the first member and the third member through the support shaft and maintaining the gap therebetween.

1(a) and 2 show an embodiment of the invention of claim 1.

A shaft 1a and a shaft 1b serving as a first pin and a second pin are fixed to a disk 1, which is an example of a first member, by fastening or the like. The axes 1a and 1b are located apart from each other in opposite directions with the axis X as the center, and are provided parallel to the axis X. The shafts 1a and @lb each have a disk 1 and a spacer 2.
．． A roller 4 and a roller 5 as a first roller and a second roller are rotatably supported via a roller 3. The rollers 4 and 5 are held in position by E-rings 6 and 7, respectively, so that they do not come off the shafts 1a and 1b.

Similarly to the disk I, the disk 8, which is an example of the second member, has a shaft 8a and a shaft 8b as a third pin and a fourth pin, respectively.
A roller 11 and a roller 12 as a third roller and a fourth roller are rotatably supported on the top via a spacer 9 and a spacer 1°, respectively.
4, the axial position is regulated.

The circle vL8 is further provided with a notch 8c and a notch 8d as a first long groove and a second long groove, respectively, which are elongated in the radial direction, into which the rollers 4 and 5 are fitted, respectively, to guide their rotation. Notch 8C18d is roller 4.5
The roller 4.5 is formed to have a width slightly larger than the outer diameter of the roller 4.5 and to be somewhat smooth so that the roller 4.5 rotates smoothly.

The disc 15, which is an example of the third member, is provided with a notch 15a and a notch 15b as a third long groove and a fourth long groove, respectively, in the same manner as the disc 8. They fit together and guide them.

With this configuration, the disk 1 can freely move in one radial direction relative to the disk 8 by smooth rotation of the roller 4.5, and the disk 15 can similarly move in the other radial direction (this In the case of the embodiment, it can move freely in the direction perpendicular to the direction in which the disk I moves. Therefore, disk 1 and disk 1
5, it becomes possible to displace within a relatively constant area range.

In this embodiment, as shown in FIG. 1 (al), the gap between the outer diameter of the roller and the notch is set to 6, so the area range of δ×δ becomes the movable range.

As a result, for example, as shown by the broken line in FIG.
If eccentricity occurs between the rotating shafts 30 and 31 when they are connected, the intermediate disk 8 becomes a circle! It moves smoothly between L11 and disk 15 without applying a large radial force to disk 1 and disk 15, and disk L and disk]5
The two rotate smoothly at their eccentric positions without being tossed around or vibrating.

FIG. 3 shows an embodiment of the invention of claim 2.

The rollers 4.5 each have a collar 4a, 4b, and the roller 1
112 similarly has flanges 11a and 12a. By providing the flanges in this manner, the disks 8 and 15 are spaced between the spacer 2.3 and the flanges 4a and 4b, and between the spacer 9.3 and the flanges 4a and 4b, respectively.
10 and tj411a, 12a, their respective axial positions are regulated, and the disks 8 and 15 can be integrated.

FIG. 4 and FIG. 5 show an embodiment of the invention according to claim 3.

The disk 1.8.15 has holes 1c, 8C, and 15c each having a diameter larger than the support shaft 16 around the axis X, and the support shaft 16 passes through these holes, and the disk 1.8.15
After assembling the disks 1 and 15, the disks 1 and 15 are regulated in a fixed position by an E-ring I9.20 via a spacer 17.18, and the whole is integrated.

In this case, the range of eccentricity between the discs 1 and 15 is also limited by the difference δ' in diameter between the support shaft 16 and the holes 1c, 8c, and 15c, and this δ' and the outer diameter of the roller The possible eccentricity range is determined by the smaller of the gap and the gap δ.

In the above embodiments, the first to third members are shown as disc-shaped members, but it goes without saying that these members can have other suitable shapes.

Moreover, although the long groove is a notch, it is made to be long and provided inside the outer periphery of the disk, and the outer periphery of the disk 1 or the disk 15 is used as a torque transmission surface of a gear, etc., and the first member or the second member is used as a driving member. Alternatively, it is also possible to configure it as the driven member itself.

As described above, according to the present invention, in the invention of claim 1, the displacement between the first member and the second member and between the second member and the third member is performed by the rolling of the roller, so that the displacement between these members is The resistance is minute because it becomes rolling H friction resistance, and the reaction force in the radial direction can be made extremely small. As a result, the holding structure on the drive side and the driven side can be simplified, and torque can be transmitted well without swinging around each other or generating vibrations. Furthermore, since the amount of eccentricity between the driving side and the driven side can be arbitrarily set by changing the length of the long groove, it becomes possible to tolerate a large amount of eccentricity.

In the invention of claim 2 or 3, since the first member to the third member are integrated, assembly can be automated, attachment and detachment, and maintenance and management of parts are facilitated, and loss of parts can be prevented. I can do it.

[Brief explanation of drawings]

Fig. 1(a) is a front view of a drive transmission device according to an embodiment of the present invention, rb) is a cross-sectional view of the drive transmission device, Fig. 2 is an exploded perspective view thereof, and Fig. 3 is an exploded perspective view of the drive transmission device according to an embodiment of the present invention. Side sectional view of the embodiment, FIG.
FIG. 5A is a front view of yet another embodiment, FIG. 5B is a side sectional view thereof, FIG. 5 is an exploded perspective view thereof, and FIGS. 6 to 9 are explanatory views of a conventional shaft joint. 16-...- Support shaft lc, 8C115C-- Hole X... Axis (1 axis)

Claims (3)

[Claims] (1) It has a first member, a second member, and a third member that are rotated around one axis, and the first member is located at a position apart from the one axis in diametrically opposite directions to each other, A first pin parallel to the one axis and a second pin
the first pin and the second pin each have a first
a roller and a second roller are rotatably supported, and the second member includes a third pin and a fourth pin parallel to the first axis at positions apart from each other in radial directions opposite to each other; The third pin and the fourth pin rotatably support the third roller and the fourth roller, respectively, and further include a first long groove and a first long groove that are long in the radial direction and guide the rotation of the first roller and the second roller, respectively. the third member has a third long groove and a fourth long groove that are long in the radial direction and guide the rotation of the third roller and the fourth roller, respectively; the first member and the second member A drive transmission device characterized in that a third member is arranged in sequence and driving force is transmitted between the first member and the third member. (2) The first roller, the second roller, the third roller, and the fourth roller are arranged so that the second member and the fourth roller are connected to the free end sides of the first pin, second pin, third pin, and fourth pin, respectively. The drive transmission device according to claim 1, further comprising a collar that prevents the three members from coming off. (3) The first member, the second member, and the third member each include a support shaft centered on the one shaft, and each of the first member, the second member, and the third member is provided with a hole having a diameter larger than the support shaft centered on the one shaft, and each of the holes 2. The drive transmission device according to claim 1, wherein the support shaft extends through the support shaft, and positions of the first member and the third member are regulated at fixed positions.