JPH04157210A - Coupling - Google Patents

Abstract

PURPOSE:To take proper measures for torsion between shafts and improve vibration damping characteristics by inserting fixtures installed on respective shafts through an elastic part into a through hole in an arranged body consisting of a divided layer of adjoining two layers and a rubber layer which is bound to it and permits relative displacement through an elastic part. CONSTITUTION:Between a divided layer 10 consisting of two rigid bodies, a rubber layer 11 which permits their relative displacement is bound to constitute an arranged body 1, and an elastic rubber sleeve 3 is installed between an inner peripheral surface which divides a through hole 1a formed around the central shaft center P2, and the first and second fixtures 20 and 21. The first and second fixtures 20 and 21 attached to respective shafts are inserted into the through hole 1a alternately. It is thus possible to take proper measures for torsion of both the shafts and improve vibration displacement characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to couplings. This coupling can be applied, for example, to a plate-like coupling that is interposed between a steering shaft and a gearbox of an automobile.

[Conventional technology]

As shown in FIG. 5 and FIG. 6, the coupling includes a disk body 100 having a central axis P1, and fixtures held by the disk body 100 and arranged at intervals in the circumferential direction of the central axis P1. A device composed of a group 200 is known. The fixture group 200 includes a cylindrical first fixture 210 and a first fixture 2.
10f! The cylindrical second attachment located at II consists of a fitting 220. The board 100 is mounted with an adjacent fixture 210.2.
Wrap the reinforcing thread in a loop around 20 and attach the adjacent parts to tool 2.
Reinforcement band 110 connecting 1O1220 and reinforcement band 110
The attachment is formed by a rubber body 120 that embeds and holds the tools 210 and 220.

When using the coupling, for the first installation, the tool 21O is attached to one shaft with a bolt, etc., and for the second installation, the tool 220 is attached to the other shaft with a bolt, etc., so that the coupling can be attached to one shaft. and the other shaft. and,
Torque transmission between one shaft and the other takes place via a coupling.

[Problem to be solved by the invention]

The above-described coupling has the advantage that the rubber body 120 damps vibrations when the vibrations are transmitted between the shafts. However, the installation is performed using the reinforcing band 110 wrapped around the fittings 210 and 220.
The dimensional stability of the reinforcing threads forming the rubber body 12 is low.
There is a problem in that the reinforcing threads are deformed during vulcanization, and the spring properties of the coupling, especially the spring properties in the rotational direction (torsion spring properties), tend to vary.

Therefore, in recent years, the present applicant has been developing a rigid coupling made of a rigid material such as resin or metal as a method that does not use reinforcing threads.

The present invention was made as part of the above-mentioned development, and its purpose is to obtain good vibration damping characteristics even when the disc body is made of a rigid material such as resin or metal. To provide a coupling that can cope with torsion even when the shafts are twisted.

[Means to solve the problem]

The coupling of the present invention has an even number of through-holes that are interposed between one shaft and the other shaft and that penetrate approximately parallel to the central axis and are arranged at a distance of wRN in the circumferential direction of the central axis. A mounting device consisting of a first mounting tool which is arranged at intervals in the circumferential direction of the central axis of the board body and is attached to one shaft, and a second mounting tool which is attached to the other shaft. The inner circumferential surface that partitions each through-hole of the board body and each attachment are interposed between the tool, and the inner circumferential surface and the attachment are composed of an even number of elastic parts bonded to the tool, and the board The body includes at least two divided layers made of rigid bodies divided at intervals in a direction parallel to the central axis, and a rubber bonded to the adjacent divided layers to enable relative displacement of each adjacent divided layer. It is characterized by consisting of layers.

The disk body forms the main body of the coupling and has a central axis. An even number of through holes are formed in the disk body, passing through the disk substantially parallel to the central axis. The opening degree and planar shape of the through hole can be selected as appropriate.

The fittings constituting the fitting group can be, for example, cylindrical into which a bolt can be inserted, or rod-shaped with a male thread at the tip.

The elastic part is interposed between the inner circumferential surface that partitions each through hole of the board and each mounting tool, and the inner circumferential surface and the mounting are connected to the tool, and the mounting is caused by the displacement of the tool, especially This ensures displacement in the axial direction. The elastic part can be sleeve-shaped. Note that the thickness and material of the elastic portion can be selected as appropriate.

The disk body is formed of at least two divided layers and a rubber layer. The divided layer is divided at intervals in a direction parallel to the central axis. The dividing layer is made of a rigid body and can be made of hard resin or metal. The resin can be appropriately selected from thermoplastic resins and thermosetting resins depending on the type of coupling. For example, nylon resin, epoxy resin, etc. can be used, and resins containing reinforcing materials such as glass fiber can also be used. As for the metal, steel or aluminum alloy can be used. The rubber layer is bonded to adjacent divided layers and connects the adjacent divided layers. Since the rubber layer is elastically deformable, each divided layer can be relatively displaced in the circumferential direction, axial direction, and radial direction of the coupling. The thickness, material, hardness, and relative displacement amount of the rubber layer can be appropriately selected depending on the type of coupling.

[Effect]

The function of the coupling of the present invention will be explained along with its usage. When in use, as in the past, the first attachment attaches the tool to one shaft, the second attachment attaches the tool to the other shaft,
This allows the coupling to be interposed between one shaft and the other shaft. Torque transmission between one shaft and the other shaft is performed via a coupling.

In transmitting torque, the shaft or attachment may undergo relative displacement in the circumferential direction, axial direction, radial direction, or a combination thereof. In this case, relative displacement of the shaft and the mounting tool is allowed due to the elastic deformation of the elastic portion. Furthermore, relative displacement of each divided layer is allowed due to elastic deformation of the rubber layer.

Furthermore, when vibrations are transmitted between the shafts, the vibrations are attenuated by the vibration-absorbing action of the elastic portion and further by the vibration-absorbing action of the rubber layer interposed between the divided layers.

〔Example〕

Hereinafter, the coupling of the present invention will be explained according to the embodiments shown in FIGS. 1 to 3. A sectional view of the coupling of this embodiment is shown in FIG. 1, and a plan view thereof is shown in FIG. This coupling is composed of a disk body 1, a fixture group 2, and an elastic sleeve 3 as an elastic part.

The disk body l has a central axis P2 and is disk-shaped. The disk body 1 consists of two divided layers 10 made of a rigid body and a rubber layer 11. The divided layer 10 is divided at intervals m in a direction parallel to the central axis P2. The dividing layer 10 has a plate shape with a required thickness, and is made of hard nylon resin reinforced with glass fibers. The rubber layer 11 connects adjacent divided layers 10 to each other. The outer peripheral surface 11a of the rubber layer 11 has approximately the same diameter as the outer peripheral surface 10a of the dividing layer 10. Since the rubber layer 11 is elastically deformable, each divided layer 10 can be relatively displaced. A total of four through holes 1a are formed in the disk body 1 around the central axis P2.

The fixture group 2 is held on the board l, and the central axis P2
The first fittings are arranged at intervals along the circle S in the circumferential direction of the holder 20, and the second fittings 21 are arranged between the first fittings 20.

The tool 20 for the first attachment and the tool 21 for the second attachment are made of metal,
It has a cylindrical shape with insertion holes 20a and 21a.

The elastic sleeve 3 has a cylindrical shape with a required thickness, and has an axis substantially parallel to the central axis P2. A total of four elastic sleeves 3 are arranged at 90 degree intervals along the circumferential direction of the central axis P2. Each elastic sleeve 3 is connected to each through hole 1 of the disk body 1.
The inner circumferential surface that partitions a and each attachment are interposed between the tools 2Q and 21, and the inner circumferential surface and the attachment are connected to the tools 20 and 21.

The elastic sleeve 3 is integrally formed of the same material as the rubber layer 11.

To manufacture the above-mentioned coupling, the rubber layer 11 and the elastic sleeve 3 and jII are attached using a tool 20. For the second installation, the tool 21 is vulcanized and bonded, and the rubber layer 11 and elastic sleeve 3 are coated with adhesive and placed in a predetermined position in the cavity of the injection mold, and in this state, the glass fiber is attached. The molten nylon resin containing the nylon resin is injected into the cavity using an injection molding machine at an injection pressure of 3°O-1000 kg/c+d, the rubber layer 11 and the elastic sleeve 3 are wrapped in the molten nylon resin, and the molten material is solidified while maintaining pressure. . Note that during molding, the rubber layer 11 and elastic sleeve 3 are pre-compressed due to injection pressure and volumetric contraction of the nylon resin as it solidifies, so the durability of the rubber layer 11 and elastic sleeve 3 is improved. , which is advantageous for extending life.

Now, when using the coupling of this embodiment, the third
As shown in the figure, one shaft 7 having a bifurcated connecting portion 7o and the other shaft 8 having a bifurcated connecting portion 80 are used, and the hole in the connecting portion 7o of one shaft 7, the first mounting Insertion hole 2 of tool 20
Tighten the nut 74 to the bolt 73 passed through 0a to connect the first mounting tool 20 to one shaft 7, and connect the first mounting tool 20 to the other shaft 8.
For the second attachment, tighten the nut 84 on the bolt 83 passed through the insertion hole 21a of the coupling part 80, and connect the second attachment attachment 21 to the other shaft 8, thereby connecting the coupling to one side. The shaft 7 is connected to the other shaft 8 to form a valve chamber between the two shafts.

In this state, when either the shaft 7 or the shaft 8 is rotationally driven as a drive-side shaft, torque is transmitted to the driven-side shaft via the coupling, and the driven side rotates.

Here, in this embodiment, when vibration is transmitted between one shaft 7 and the other shaft 8, the rubber layer 11 and the elastic sleeve 3 interposed between the divided layers 10 have a vibration absorbing effect. Vibration is damped.

Further, during torque transmission, the shafts 7.8 and the mounting tools 2o, 21 may be displaced relative to each other in the circumferential direction, axial direction, radial direction, or a combination thereof of the coupling. In this case, relative displacement of the dividing layer 10 is allowed due to the elastic deformation of the rubber layer 110.

In addition, due to the elastic deformation of the elastic sleeve 3, the mounting tool 20.2
A relative displacement of 1 is allowed.

Furthermore, since the elastic sleeve 3 is integrally connected to the rubber layer 11 sandwiched between the dividing layers 10, the elastic sleeve 3
It can also be expected to have the effect of suppressing the extraction from board 1.

In the above-mentioned embodiment, when manufacturing the coupling, as described above, the mounting is performed using the tool 20.21 and the rubber layer]l.
is placed in the cavity of the mold, the rubber layer ll is loaded with resin, and the fittings 20 and 21 are attached. However, the present invention is not limited to this. After forming the dividing layer 10. For installation, use tool 20.2
1 is placed in a predetermined part of the cavity of the mold, and then unvulcanized rubber is loaded into the cavity portion corresponding to the rubber layer 11 and the elastic sleeve 3 and vulcanized, thereby forming the dividing layer 10,
The rubber layer 11 and the fittings 20 and 21 may be attached together.

[Application example]

An example of applying the above coupling is shown in @4IN.

In this example, the coupling is applied to an automobile steering system. 90 is a steering wheel, 91 is a steering column, 92 is a steering shaft, 9
3 is an intermittent shaft, 94 is a steering gear box, and the disc body 1 of this coupling is a steering shaft 92 and an intermittent shaft 9.
3 and are interposed. When the steering wheel 90 is operated, the torque is applied to the steering shaft 92, the coupling plate 1, the intermittent shaft 93, and the steering gear box 94.
are transmitted in this order.

Vibration transmission between shafts 92,93 is damped by the coupling. Also, when transmitting torque, the shaft 92.9
3 undergoes a relative displacement, the coupling can follow.

〔Effect of the invention〕

According to the coupling of the present invention, when vibrations are transmitted between one shaft and the other shaft, the vibrations are attenuated by the vibration absorbing action of the rubber layer interposed between the divided layers.

Furthermore, according to the coupling of the present invention, the rubber layer interposed between adjacent dividing layers allows relative displacement of each dividing layer, so that relative displacement of each dividing layer is allowed, so that the rubber layer interposed between adjacent dividing layers allows relative displacement in the circumferential direction, axial direction, radial direction, or a combination of these directions. This is advantageous in that each sublayer can track and therefore correspond to relative displacements of the shafts during torque transmission.

Furthermore, according to the coupling of the present invention, when the elastic part is integrally connected to the rubber layer sandwiched between the dividing layers,
It is possible to prevent the elastic part from coming out from the disk body.

[Brief explanation of drawings]

1rM to 3 show embodiments of the present invention, FIG. 1 is a sectional view of the coupling taken along line A-A in FIG. 2, FIG. 2 is a plan view, and FIG. 3 is a cross-sectional view of the coupling. FIG. 4th [ is a perspective view showing an example of application. 5 and 6 show the prior art, FIG. 5 being a sectional view and FIG. 6 being a plan view. In the figure, l is a board, lO is a dividing layer, 11 is a rubber layer, 2 is a group of fixtures, 20 is a first fixture, 21 is a second fixture,
3 indicates an elastic sleeve. Patent applicant: Tokai Rubber Industries Co., Ltd.

Claims (1)

[Claims] (1) A board that is interposed between one shaft and the other shaft and has an even number of through holes that penetrate approximately parallel to the central axis and are spaced apart in the circumferential direction of the central axis. a fixture group consisting of a first fixture disposed at intervals in the circumferential direction of the central axis of the disk body and attached to one shaft, and a second fixture attached to the other shaft; an elastic portion interposed between an inner circumferential surface that partitions each of the through holes of the disk body and each of the fixtures, and comprising an elastic portion bound to the inner circumferential surface and the fixture; , at least two divided layers made of rigid bodies divided at intervals in a direction parallel to the central axis, and a rubber bonded to the adjacent divided layers to enable relative displacement of each adjacent divided layer. A coupling characterized by consisting of layers.