JPH0449373Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of application and overview of the invention) The present invention relates to Oldham couplings, especially sliding parts for torque transmission, and improves torque transmission efficiency by reducing resistance of the sliding parts. The aim is to

(Prior art and its problems) As shown in FIG. 6, the Oldham joint consists of a first main body 1 connected to the input shaft side, a second main body 2 connected to the output shaft side, and furthermore, , an intermediate body 3 that engages with the second main body, and a projecting piece 41 with a rectangular cross section provided on one side of the intermediate body 3 is orthogonal to a similar projecting piece 42 provided on the other surface, and one projecting piece is connected to the first main body. 1
The other projecting piece 42 is fitted into the groove 51 formed on the end surface of the second main body 2 in a pairwise manner, respectively.
When the input shaft is connected to the first main body 1 and the output shaft to the second main body 2 with the first main body 1, intermediate body 3, and second main body 2 engaged, these two shafts are connected as shown in FIG. Torque is transmitted even when installed on different levels.

Although this Oldham joint has the above-mentioned advantages, it is not used very often at present.
Normally, the input and output shafts are not installed at different levels, and in most cases these two shafts are installed coaxially or in a bent position, and the main reason for this is that there is no need to use an Oldham joint. be. Against this background, there have been few proposals regarding Oldham's joints in the past.
It is only introduced in literature such as ``Mechanism for Beginners'' published by Rigakusha.

However, recently, the types of input shafts and output shafts have become more diverse, and the uses of Oldham's joints are expanding. However, this Oldham joint has a problem in that when the input and output shafts are at different levels, the torque transmission from the first main body 1 to the second main body 2 lacks smoothness of operation. Another problem is that the torque transmission efficiency is insufficient.

When torque is transmitted from the first main body 1 to the second main body 2 which is in a state of difference in level, the groove 51 and the protruding piece 41 and the groove 52 and the protruding piece 42 need to slide in the radial direction. 1. If the second main bodies 1, 2 and the intermediate body 3 are made of metal, the sliding resistance will be large, and transmission loss will occur accordingly.

In addition, when the above three members are made of metal, a fitting gap is likely to be formed between the groove and the protrusion due to manufacturing reasons, and this gap appears as looseness in the torque transmission state.

Of the above problems, the former problem is solved by forming grooves 51 and 52 on the intermediate body 3 and forming protrusions 41 and 42 on the other first and second main bodies 1 and 2 sides, as shown in FIG. This can be alleviated to some extent by forming this intermediate body with nylon resin or the like.

However, in this case, the first and second subjects 1,
The difference in thermal expansion due to the difference in the materials of the intermediate body 2 and the intermediate body 3 causes non-smoothness in mutual sliding between the protruding piece and the groove. Due to the difference in thermal expansion caused by temperature changes, the protrusions 41, 42
This is because the gap between the grooves 51 and 52 may become too large, or the two may become tightly fitted.

(Technical Problem) The present invention provides an Oldham joint in which torque is transmitted between the intermediate body 3 and the first and second main bodies 1 and 2 through the engagement of grooves and protrusions, respectively. In order to ensure that the torque is transmitted smoothly from the main body 1 to the second main body 2 and that the transmission state is maintained even if there is a temperature change, the protrusion and the groove are coupled in a low friction state. The technical problem is to prevent a difference in thermal expansion from occurring between the protrusion and the groove.

(Means) The technical means of the present invention taken to solve the above technical problem is that ``the first and second main bodies 1 and 2 and the intermediate body 3 are made of materials with the same expansion coefficient, and the protruding pieces 4
An anti-friction layer 40 is formed on the opposing surfaces and end surfaces of the projections 1 and 42, and the anti-friction layer 40 is composed of a series of anti-friction sheets 43 adhered in such a manner as to surround the cross section of the protrusion.

(effect) The above configuration of the present invention operates as follows.

At the engagement portion between the first and second main bodies 1 and 2 and the intermediate body 3, the protrusions 41 and 42 and the grooves 51 and 52 are mated with each other with the anti-friction layer 40 interposed therebetween. Therefore, the sliding resistance at this forward pair portion is significantly reduced. Further, the coefficients of thermal expansion of the members constituting the protrusions 41, 42 and the grooves 51, 52 are set to be the same, and the anti-friction layer 40 interposed between them is set to be relatively thin. Therefore, even if a significant temperature change occurs during use, the gap between the sliding parts due to the difference in thermal expansion does not change.

Furthermore, since the structure of the anti-friction layer 40 is such that a series of anti-friction sheets 43 are adhered in such a manner that they surround the cross sections of the protrusions, when each protrusion is fitted into the corresponding groove, Even if the adhesion of the antifriction sheet 43 is incompletely solidified, the solidification is completed over time after fitting. Therefore, after fitting, the anti-friction sheet 43 is interposed between the groove and the protrusion in a predetermined manner. Further, even if the protruding piece is fitted into the groove in an incompletely solidified state, there is no fear that the position of the anti-friction sheet 43 will shift.

(Effects) Since the present invention has the above configuration, it has the following unique effects.

Since the sliding resistance on the sliding surface between the protrusion and the groove is reduced, torque transmission efficiency is improved.

Further, since the sliding gap of the sliding portion hardly changes due to temperature changes, there is no fear that temperature changes will cause mating defects in the mating portions.

Furthermore, since the anti-friction sheet is adhered in a U-shape so as to surround the cross section of the protruding piece, the anti-friction sheet will not shift when assembling the joint, and the adhesion of the anti-friction sheet will be completed. Even if you incorporate it before,
The anti-friction sheet is appropriately interposed between the groove and the protrusion. In addition, since the end face of the protrusion is also covered with the anti-friction sheet, it is possible to reduce the occurrence of abnormal noise caused by the contact between the end face of the protrusion and the bottom of the groove, and the wear of this part.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 5.

In the embodiments shown in FIGS. 1 to 5, the projecting piece 4
1, 42 with anti-friction sheets 43, 43 adhered to cover the end faces from both sides of this projecting piece to form an anti-friction layer 40.
Both are made of aluminum. Moreover, as the anti-friction sheet 43, a product name "Rulon J" manufactured by Toyo Bearing Co., Ltd. is used, and a sheet with a thickness of about 0.2 to 0.5 mm is cut into predetermined dimensions.
The projecting pieces 41 and 42 are bonded from both side surfaces to cover the end faces.

In this embodiment, a two-component Epoquin adhesive is used as the adhesive 5 for bonding the anti-friction sheet, and the fitting gap between the grooves 51, 52 and the projections 41, 42 is filled with the anti-friction sheet. A predetermined gap is set in advance in consideration of the thickness of the sheet 43.

The anti-friction sheet 43 is attached to the protrusion 4 using the adhesive 5.
1 and 42 and is fitted into a jig D having the same groove 50 as the grooves 51 and 52, the layer of adhesive 5 dries and hardens while absorbing the variation in the gap.

(See FIG. 2) In this embodiment, the anti-friction sheet 43 is disposed so as to cover the tip surfaces of the projections 41 and 42, so that when the adhesive 5 dries and hardens, the bottom surface of the groove 50 There will be no inconvenience such as the adhesive 5 adhering to the surface.

Further, the depth of the grooves 51 and 52 formed in the intermediate body 3 is set to be larger than one-half of the thickness of the intermediate body 3 in the axial direction, and a cut-out portion is formed in the center of each protruding piece 41 and 42. Since the protrusion 4 is provided in the main part of torque transmission,
1 and 42 are located, and these bite deeply into the intermediate body 3. Therefore, there is an advantage that the transmission torque can be set large.

Furthermore, in this embodiment, as shown in FIG.
A tightening ring 7 having a tapered surface matching the taper on the inner surface is fitted onto a tapered tube 6 having a plurality of bolts 8, 8.
It is designed to be tightened toward the first and second main bodies 1 and 2. Therefore, as shown in FIG. 4, when the shaft 9 is inserted into the tapered cylinder 6 and the bolt is tightened, the shaft 9 is connected to the first and second main bodies 1 and 2.

Next, as the material constituting the anti-friction layer 40, materials other than those mentioned above can be adopted, such as fluorine-based synthetic resin such as tetrafluoroethylene resin, nylon resin, or knitting or weaving of carbon fiber. sheets etc.
Materials with a low coefficient of friction and high heat resistance can be used instead.

It is also possible to fit the projections 41, 42 and the grooves 51, 52 into the relationship shown in FIG. 6.

[Brief explanation of the drawing]

Fig. 1 is an exploded view of the embodiment of the present invention, Fig. 2 is an explanatory view of the anti-friction sheet being adhered, Fig. 3 is a detailed view of the shaft connection part, Fig. 4 is an explanatory view of the state of use, and Fig. 5 is X-
The X sectional view and FIGS. 6 to 8 are explanatory diagrams of conventional examples, and in the figures, 1...first main body, 2...second main body, 3...intermediate, 40...friction-reducing layer, 41, 42... protrusion, 5...
...adhesive, 51, 52...concave groove.

Claims (1)

[Scope of utility model registration request] In the Oldham joint, in which the intermediate body 3 and the first and second main bodies 1 and 2 are transmitted to a torque transmission state by the engagement of a groove and a protruding piece, respectively, the first and second main bodies 1 and 2 are connected to each other.
The main bodies 1, 2 and the intermediate body 3 are made of materials with the same coefficient of expansion, and an antifriction layer 40 is formed on the opposing surfaces and end surfaces of the protrusions 41, 42, and the antifriction layer 40 is formed so that the cross section of the protrusion is Oldham joint consisting of a series of anti-friction sheets 43 glued in a surrounding manner.