JPH0454343Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an elastic joint that connects one shaft and the other shaft to transmit power and suppress the transmission of vibrations and the like.

The present invention can be used, for example, in an elastic joint used to connect a propeller shaft that transmits the driving force of an automobile engine and a steering shaft that transmits the rotational force of a steering wheel of an automobile.

[Prior Art] An elastic joint, for example, an elastic joint used for connecting a propeller shaft, has a first mounting bracket 1 having an insertion hole 101a, as shown in FIGS. 4 and 5.
01 and a second mounting bracket 11 having an insertion hole 110a.
0, the first mounting bracket 101 and the second mounting bracket 11
The main component is an elastic member 106 that connects the two. Here, the first fittings 101 and the second fittings 110 are arranged alternately around one central axis 102. Here, the elastic member 10
6 is a structure consisting of a reinforcing cable band 104 made of a reinforcing cord that connects the adjacent first mounting bracket 101 and second mounting bracket 110, and an elastic rubber portion 105 that covers the reinforcing cable band 104.

When using the elastic joint described above, as shown in FIG.
By connecting the mounting bracket 101 to the propeller shaft 107 and passing the other bolt 108 through the insertion hole 110a of the second mounting bracket 110, the second mounting bracket 1
10 is connected to the other shaft 109. If the above-mentioned elastic joint is used, the elastic joint rotates in the direction of arrow A or in the opposite direction together with the propeller shaft 107 and shaft 109. Therefore, while ensuring damping performance against vibration etc., the elastic joint rotates with the propeller shaft 107 and shaft 109.
Driving force can be transmitted between the

[Problems to be solved by the invention] With such an elastic joint, for example, during high-speed rotation, gear noise from the differential is transmitted through the propeller shaft and causes a muffled sound inside the vehicle.In order to suppress this, the direction of rotation of the elastic joint is changed. It is desired to reduce the spring constant in the axial direction without reducing the spring constant of the bearing.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to divide the reinforcing cable band that connects two adjacent mounting brackets in the axial direction of the elastic joint, thereby improving the rotation direction. To provide an elastic joint that can reduce the spring constant in the axial direction without reducing the spring constant of the spring constant, thereby increasing the value of (spring constant in the rotating direction)/(spring constant in the axial direction). be.

[Means for Solving the Problems] The elastic joint according to the present invention has two or more first elastic joints connected to one shaft and arranged at equal intervals on a first circumference having one central axis. a mounting bracket, and two adjacent first shafts connected to the other shaft at equal intervals on a second circumference having the central axis of the first shaft.
It is composed of second mounting brackets arranged between the mounting brackets and having the same number as the first mounting brackets, and an elastic member that connects and holds the first mounting bracket and the second mounting bracket, each of the elastic members A plurality of first reinforcing cable bands are connected from the first mounting bracket to a second mounting bracket adjacent to each other in one direction in the circumferential direction, and are divided at intervals in the direction of the central axis; The first mounting bracket extends from the mounting bracket to a second mounting bracket adjacent to the second mounting bracket in the other direction in the circumferential direction, connects the two, and is divided at intervals in the direction of the central axis.
A reinforcing cable band consisting of a reinforcing cable band and a plurality of second reinforcing cable bands arranged alternately; A single-integrated elastic rubber part forms hollow parts between the first reinforcing cable bands and between the second reinforcing cable bands and covers each of the first reinforcing cable bands and each second reinforcing cable band. It is characterized by this.

When the elastic rubber portion has a single unitary structure, it means that the elastic rubber portion is integrally connected.

In the elastic joint according to the present invention, each reinforcing cable band that connects two adjacent fittings is divided in the axial direction of the elastic joint. Therefore, a hollow portion is formed between the reinforcing cable bands divided in the axial direction.
The hollow portion is not a minute gap, but has dimensions such that the opposing rubber surfaces do not come into sliding contact even when subjected to minute vibrations.

Therefore, in the elastic joint according to the present invention, because of the hollow part, it becomes soft in the axial direction and the spring constant in the axial direction can be reduced. The constant can be made smaller.

Here, the first circumference and the second circumference are preferably the same circumference, but are not necessarily limited to this.

The reinforcing cord band can be formed by bundling a large number of reinforcing cords such as polyester fibers.

Further, the first mounting bracket and the second mounting bracket may be formed of a simple cylindrical body, or may include a cylindrical outer member having a central hole having a center axis substantially parallel to the first center axis, and It may consist of an inner member held within the central hole of the member and a lubricating member interposed between the inner member and the outer member.
By providing a lubricating member in this way, the inner member and outer member can easily move relative to each other in the axial direction, so that when an external force is applied in the axial direction due to vibration or impact, the inner member will not move relative to the outer member. sliding in the axial direction. Therefore, the spring constant in the axial direction of the elastic joint can be made even lower without reducing the spring constant in the rotational direction.

[Function] In the elastic joint according to the present invention, two adjacent
Each reinforcing cable band connecting the individual mounting fittings is divided in the axial direction, and a hollow portion is formed between the divided reinforcing cable bands. Therefore, when an external force acts in the axial direction, the elastic member easily bends in the axial direction, and the spring constant in the axial direction can be reduced.
Therefore, the spring constant of the elastic joint in the rotational direction can be ensured while the spring constant in the axial direction can be reduced.

[Effects of the invention] According to the elastic joint of the invention, each reinforcing cable band is divided in the axial direction and can be made soft in the axial direction.Therefore, while securing the spring constant in the rotational direction, The spring constant in the direction can be reduced. Therefore, the value of {(rotational direction spring constant)/(axial direction spring constant)} can be increased.

Therefore, if the elastic joint according to the present invention is applied to an elastic joint connected to a propeller shaft of an automobile, high-frequency vibrations generated in the axial direction caused by the universal joint can be effectively suppressed.

By the way, since each reinforcing rope band is divided in the axial direction, it becomes easy to bend in the axial direction. Therefore, if the rubber covering each reinforcing cable band is separate, there is a risk that the opposing rubber surfaces will come into sliding contact with each other due to minute vibrations acting in the axial direction, causing friction damage and deterioration of the rubber. In this regard, in the present invention, the elastic rubber parts that cover the reinforcing cord, the first mounting bracket, and the second mounting bracket are of a single, integral structure, and the hollow part does not come into sliding contact with the opposing rubber surface even when subjected to slight vibrations. Since the thickness is moderate, this problem can be improved. According to the elastic joint of the present invention, since the first reinforcing cable band and the second reinforcing cable band are arranged alternately along the direction of the central axis, the resistance to tilting of the mounting bracket is increased, and the installation during use is improved. This is advantageous in maintaining the posture of the metal fittings in a normal state.

[Example] An elastic joint according to the present invention is shown in FIGS. 1 and 2.

The elastic joint according to this embodiment is an example applied to an elastic joint connected to a propeller shaft of an automobile.

As shown in FIG. 1, the elastic joint according to this embodiment includes a first mounting bracket 1, the same number of second mounting brackets 2 as the first mounting brackets 1, and a first elastic member 3 as an elastic member. It consists of a second elastic member 4 as an elastic member.

The first mounting fittings 1 are made of metal and are arranged at equal intervals on a first circumference 10 having five central axes.

The second mounting fittings 2 are made of metal and are arranged at equal intervals on a first circumference 10 having one central axis 5. As shown in FIG. 1, this second mounting bracket 2 is located between two adjacent first mounting brackets 1. First mounting bracket 1 and second mounting bracket 2
is fixed to elastic rubber parts 31 and 41, which will be described later, by vulcanization adhesive, and has a cylindrical shape with a central axis substantially parallel to the central axis 5 of the first.

As shown in FIG. 2, the first mounting bracket 1 has annular flange portions 10a, 10b, 10c, 1 extending radially outward at predetermined intervals in the axial direction thereof.
It has 0d and 10e. Similarly, the mounting bracket 2 is
Annular flange portions 20a, 20b, 20 extending radially outward at a predetermined interval in the axial direction of this
It has c, 20d, and 20e.

The first elastic member 3 has a total of 3 elastic members as shown in FIG.
The first mounting bracket 1 and the second mounting bracket 2 which are adjacent to each other are connected to each other. Each first elastic member 3 includes two reinforcing cable bands 30 divided at intervals in the direction of one central axis 5, and an elastic rubber portion 3 formed by covering the reinforcing cable band 30 with natural rubber.
Consists of 1. As shown in FIG. 2, the reinforcing cable band 30 connects the first mounting bracket 1 and the second mounting bracket 2 that are adjacent to each other, and has a loop shape.
It is made by bundling many polyester fibers together.

As shown in FIG. 2, two elastic rubber parts 31 are divided at intervals in the direction of the central axis 5,
A hollow part 32 is formed between the parts 31.

A total of three second elastic members 4 are provided like the first elastic members 3, and are used to connect the first mounting bracket 1 and the second mounting bracket 2 that are adjacent to each other.
The second elastic member 4 is an elastic rubber section made up of two reinforcing cable bands 40 divided at intervals in the direction of one central axis 5 and natural rubber covering the reinforcing cable bands 40 by vulcanization bonding. It consists of 41. The reinforcing cable band 40 is
As shown in Figure 2, the first mounting bracket 1 of the adjacent comrade
It connects the second mounting bracket 2 and has a loop shape, and is formed by bundling a large number of polyester fibers. As shown in FIG. 2, a hollow portion 42 is formed between two elastic rubber portions 41, 41 which are divided at intervals in the direction of the central axis 5. In addition, since the reinforcing cord bands 30 and 40 are held by the flanges 10a to 10e and the flanges 20a to 20e, they are prevented from shifting in the direction of the central axis 5.

As shown in FIG. 3, elastic rubber parts 31, 41
are integrally connected, and furthermore, the hollow part 3
The thickness dimensions of 2 and 42 are such that the opposing rubber surfaces facing each other via the hollow portions 32 and 42 do not come into sliding contact with each other when a slight vibration is applied. Also, the elastic rubber part 3
1 and 41 have holes 33 and 43 in areas surrounded by reinforcing cord bands 30 and 40. The holes 33, 43 are provided primarily to save material and reduce weight.

When using the elastic joint according to this embodiment, for example, the first fitting 1 is connected to the drive shaft side, and the second fitting 2 is connected to the driven shaft side. Here, when the above-mentioned drive shaft rotates normally in the direction of arrow B (FIG. 1), the first mounting bracket 1 and the second mounting bracket 2 also rotate integrally with the drive shaft in the same direction. In this way, when the first mounting bracket 1 connected to the drive shaft rotates normally in the direction of arrow B, the second elastic member 4
A tensile stress is applied to the first elastic member 3, and the first elastic member 3 is pressed by the first fitting 1, and a compressive stress is applied to the first elastic member 3.

In the elastic joint according to the present embodiment, as shown in FIG. A hollow part 32 is formed between the elastic rubber parts 31. Further, the second elastic member 4 includes two reinforcing cord bands 40 divided at intervals in the direction of the central axis 5, and an elastic rubber portion 4 covering the reinforcing rope bands 40.
1, and is characterized in that a hollow portion 42 is formed between the elastic rubber portions 41.

Therefore, according to the elastic joint of this embodiment, the first elastic member 3 and the second elastic member 4 become soft in the direction of the central axis 5 due to the hollow portions 32 and 42, and the axial spring of the elastic joint becomes soft. The advantage arises that the constants can be reduced. Therefore, the spring constant in the axial direction can be made small while ensuring a large spring constant in the rotational direction. Therefore, in the elastic joint according to this embodiment that is connected to the propeller shaft of an automobile, it is possible to effectively suppress high-frequency vibrations that vibrate in the axial direction generated from the universal joint. Note that the reinforcing cable band 30 according to this example functions as a first reinforcing cable band, and the reinforcing cable band 40 functions as a second reinforcing cable band.

By the way, since each reinforcing cable band 30, 40 is divided in the axial direction, it becomes easy to bend in the axial direction. Therefore, if the rubber covering each reinforcing cable band 30, 40 is separate, micro vibrations acting in the axial direction, etc.
Opposing rubber surfaces of the hollow parts 32 and 42 are in sliding contact with each other,
Rubber friction damage and deterioration may occur.
In this regard, in this embodiment, as shown in FIG. 3, the elastic rubber parts 31, 41 covering the reinforcing cable bands 30, 40, the first mounting bracket 1, and the second mounting bracket 2 have a single integral structure. are connected to each other. Further, the thickness of the hollow portions 32 and 42 is such that the opposing rubber surfaces do not come into sliding contact under the effect of slight vibration. Therefore,
It is possible to solve the problem that two separate pieces of rubber do not come into sliding contact due to minute vibrations acting in the axial direction, resulting in friction damage and deterioration of the rubber. In this embodiment, as can be understood from FIG. 3, the reinforcing cable bands 30 and the reinforcing cable bands 40 are arranged along the axis of the mounting bracket 2, that is, along the central axis 5 of the elastic joint. The mounting brackets 2 are arranged alternately, and therefore have a structure that has a large resistance to tilting of the mounting bracket 2. Therefore, even if the mounting bracket 2 is pulled by either the reinforcing cable band 30 or the reinforcing cable band 40 when using the elastic joint, the tilting of the mounting bracket 2 can be reduced, and the posture of the mounting bracket 2 can be adjusted. It is advantageous to maintain it normally. Similarly, in this embodiment, the resistance against tilting of the mounting bracket 1 can be increased, which is advantageous for maintaining the normal posture of the mounting bracket 1.

In the embodiment shown in FIGS. 1 and 2 above,
The first elastic member 3 and the second elastic member 4 each having an oval oval shape are arranged in a ring strip, but instead of this, the first elastic member and the second elastic member are arranged in a disc shape. Alternatively, the first elastic member and the second elastic member may be formed integrally into a disk shape having a central hole.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention, in which FIG. 1 is a plan view of an elastic joint, and FIG. 2 is a longitudinal sectional view taken along line A--A in FIG. 1. Third
The figure is a perspective view of the vicinity of the mounting bracket. FIGS. 4 and 5 show the conventional method, with FIG. 4 being a plan view showing half of the elastic joint in section, and FIG. 5 being a longitudinal sectional view of the elastic joint in use. In the figure, 1 is the first mounting bracket, 2 is the second mounting bracket,
3 is a first elastic member, 4 and 7 are second elastic members, 5 is one central axis, 30 and 40 are reinforcing cable bands, 31 and 4
1 represents an elastic rubber portion, and 32 and 42 represent hollow portions, respectively.

Claims (1)

[Claims for Utility Model Registration] (1) Two or more first mounting brackets connected to one shaft and arranged at equal intervals on a first circumference having one central axis, and the other shaft. The same number of second mounting brackets as the first mounting brackets are arranged between two adjacent first mounting brackets at equal intervals on a second circumference having the central axis of the one, connected to the first mounting bracket. It is composed of a mounting bracket, and an elastic member that connects and holds the first mounting bracket and the second mounting bracket, and the elastic member connects the first mounting bracket to the first mounting bracket and the second mounting bracket that are adjacent to each other in one direction in the circumferential direction. a plurality of first reinforcing cord bands that face the second mounting bracket and connect the two and are divided at intervals in the direction of the central axis, and are adjacent to each other in the other direction in the circumferential direction from each of the first mounting brackets; a plurality of reinforcing cable bands facing the second mounting bracket and connecting the two, divided at intervals in the direction of the central axis, and arranged alternately with the first reinforcing cable band in the direction of the central axis; a reinforcing cable band consisting of a first reinforcing cable band, and a second reinforcing cable band between the first reinforcing cable bands and a second reinforcing cable band that covers each of the first mounting brackets and each of the second mounting brackets and faces each other in the direction of the central axis. An elastic joint comprising an elastic rubber part of a single integral structure forming a hollow part between the cable bands and covering each of the first reinforcing cable bands and each of the second reinforcing cable bands. (2) The elastic joint according to claim 1, wherein the first circumference and the second circumference are the same circumference. (3) The first mounting bracket and the second mounting bracket have a cylindrical shape with a central hole having a central axis that is approximately parallel to the central axis of the first mounting bracket, and an annular flange for holding a reinforcing cable band that extends in the radial direction on the outer periphery. 1. An elastic joint according to claim 1 of the utility model registration claim.