JP2869594B2 - Slip ring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a slip ring device for electrically connecting a rotating member and a fixed member which rotate relatively concentrically with each other via a sliding contact piece.

[0002]

2. Description of the Related Art Conventionally, as a technique for making an electrical connection between a rotating member and a fixed member that rotate relatively concentrically, there is, for example, a technique disclosed in Japanese Patent Application Laid-Open No. 63-245881. This is a configuration in which both members are connected by a spiral coil tape having a conductor and capable of following the rotation of the handle. However, in this technique, the rotation range of the rotating member is limited by the number of turns of the coil tape, and the structure is complicated. On the other hand, as a technique for electrically connecting a rotating member and a fixed member by a sliding contact piece, for example,
There is a technique according to 2-65342 and the like, which is generally referred to as a slip ring device. This conventional technique is used as a simple configuration without limiting the rotation range.

[0003]

However, in the above-described conventional slip ring device, when any impact or the like is applied, the sliding contact piece temporarily separates from the sliding contact surface, so-called chattering phenomenon occurs. However, there is a problem that an important signal cannot be transmitted because of a state of electrical non-conduction and low reliability. The present invention has been made in view of the above problems, and has as its object to prevent chattering from occurring, achieve stable electrical conduction, and improve the reliability of the slip ring device. Another object of the present invention is to provide a highly reliable slip ring device with a small number of components.

[0004]

In order to achieve the above object, a first aspect of the present invention provides an electric connection between a rotating member and a fixed member which rotate concentrically and relatively via a sliding contact piece. In one of the rotating member and the fixed member, a conductive tubular portion is disposed on the concentric axis, and the other of the rotating member and the fixed member has conductivity. A sliding contact formed of an elastic material and formed in a substantially corrugated shape along the peripheral wall surface of each of the cylindrical portions is provided, and the sliding contact has a projecting portion in contact with each of the cylindrical portions, and is provided with a slip. Construct a ring device.

According to a second aspect of the present invention, there is provided a slip ring device for electrically connecting a rotating member and a fixed member which rotate relatively concentrically with each other through a sliding contact piece. A sliding member formed on at least one of the fixing members, a conductive tubular portion disposed coaxially with the fixed member, and formed of a conductive elastic material into a substantially wavy shape along the peripheral wall surface of the tubular portion; Are disposed in contact with the cylindrical portion, and the substantially wave-shaped sliding contact pieces are configured so that the natural frequencies between adjacent ones are different at least every half pitch, and a slip ring device is provided. Constitute.

Further, a third invention is a slip ring device for electrically connecting via a sliding contact between a rotating member and a fixed member which rotate relatively concentrically via a bearing. At least one of the rotating member and the fixed member is provided with a conductive tubular portion on the concentric axis, and is formed of a conductive elastic material in a substantially wavy shape along the peripheral wall surface of the tubular portion. A sliding contact piece is disposed in contact with the cylindrical portion, and the rotating member and the fixing member each include a locking claw that has elasticity and locks an end surface of the bearing, and the locking claw and A restriction member for restricting separation between the bearings is provided to constitute a slip ring device.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a slip ring device according to the present invention will be described in detail with reference to the accompanying drawings. First, FIGS.
A first embodiment will be described based on FIG. 1 is a fixing member,
The rotating member 3 is rotatably supported on a rotation center X via a bearing 2 such as a ball bearing. Reference numerals 4 to 7 denote conductive tubular portions which are arranged on the same plane with the same rotation center X. The first cylindrical portion 4 having the smallest diameter and the fourth cylindrical portion 7 having the largest diameter are fixed to the fixing member 1. The second cylindrical portion 5
The rotating member 3 is opposed to the first cylindrical portion 4 with a predetermined gap 8.
Stick to The third cylindrical portion 6 is provided at a predetermined gap 9 with the fourth cylindrical portion 7.
And is fixed to the rotating member 3 oppositely. 4a, 5a,
Reference numerals 6a and 7a denote external terminals protruding from the respective cylindrical portions 4 to 7, and are connected to external wiring (not shown) by soldering or the like. The external terminals 4a to 7a may be configured to be connected to a connector.

Each gap 8 and 9 has at least one
One, for example, as shown in FIG.
10, 11, and 11 are interposed. Each sliding contact 10, 1
Reference numerals 0, 11, and 11 denote elastic materials such as conductive plate materials, which are formed in a substantially corrugated shape along each of the cylindrical portions 4 to 7. In addition, the substantially corrugated shape includes a polygonal shape and the like.
These sliding contact pieces 10, 10, 11, 11
The contacts 12 are alternately fixed to the inner and outer surfaces of the projecting portions that come into contact with. The height of the substantially corrugated shape in each of the sliding contact pieces 10, 10, 11, 11 is set to be larger than the separation dimensions S1, S2 of the gaps 8, 9 to be fitted therein as shown in FIG. . Therefore, each contact 12 is provided with a sliding contact piece 10, 1
The cylinders 4 to 7 are pressed against each other by the urging forces of 0, 11, and 11. Further, the sliding contact pieces 10, 10, 11, 11 are fitted into the gaps 8 and 9 while slightly compressing the substantially wave-shaped height direction.

Incidentally, each of the sliding contact pieces 10, 10, 11, 11
In order to prevent a chattering phenomenon from occurring due to resonance at the time of sliding contact with the cylindrical portions 4 to 7, as shown in FIG. It is desirable to configure them differently. To make the natural frequencies different, for example, a length dimension L, a width dimension W,
This can be achieved by appropriately changing any one of the plate thickness dimensions t or a combination of these dimensions.

Above each of the gaps 8 and 9, an annular holding plate 1 is provided.
4 and 15 are disposed, and the sliding contact pieces 1 are
0, 10, 11, and 11 are prevented from coming off, and the continuity with each of the cylindrical portions 4 to 7 is maintained well. Each presser board 1
4, 15 are a plurality of locking legs 14a, 15 protruding downward.
a is pressed into a groove or the like formed in the fixing member 1 to be mounted. Below the fixing member 1, a conventional slip ring device 1 as shown in FIG.
6 is arranged. Rotating disk 1 of this slip ring device 16
Reference numeral 6a is mounted on the rotating member 3 and slidably contacts a contact piece (not shown) mounted on the fixed member 1 side to make electrical conduction.

The bearing 2 has a plurality of locking claws 1a and 3 provided with elasticity on the fixed member 1 and the rotating member 3, respectively.
Each end face is locked by a, and detachment from the fixed member 1 and the rotating member 3 is prevented. The rear surface of the locking claw 1 a on the fixing member 1 is in contact with the inner peripheral surface of the holding plate 14. The back surface of the locking claw 3a on the rotating member 3 side is
Abuts with the tongue piece 16b protruding from the front. Thus, the holding plate 14 and the tongue piece 16b have a function of a regulating member that regulates each of the locking claws 1a and 3a from being elastically deformed and coming off from the bearing 2.

Next, the operation of the first embodiment will be described. FIG. 5 is an explanatory diagram illustrating the operation of one first sliding contact piece 10. Each contact 12 of the first sliding contact piece 10 is in pressure contact with the first cylindrical portion 4 and the second cylindrical portion 5 as shown by a solid line in a normal state. Now, if any impact or the like acts on the contact 12 at the point b of the plurality of contacts 12 located at the points a to e in FIG. The moving contact piece 10 elastically deforms in a flat shape as indicated by a virtual line 10a. Then, the contact points 12 at the points a, c, d, and e adjacent to the point b increase the urging force on each of the cylindrical portions 4 and 5, and are displaced while sliding. Therefore, the first sliding contact piece 10 maintains the electrical connection between the respective cylindrical portions 4 and 5.

If each external force acts in such a direction that the contact points 12 at the points b and d are simultaneously separated from the second cylindrical portion 5, the contact point 12 at the point c located between these points b and d is obtained. Is
Since the external forces repel each other, the phase does not change much. Therefore, it is unlikely that all the contacts 12 at the points a to e are simultaneously separated from the cylinders 4 and 5, and the first sliding contact piece 10 maintains the electrical connection between the cylinders 4 and 5. Further, the first sliding contact pieces 10 are formed as a pair, and the electrical connection is further stabilized. Although the operation of the first sliding contact pieces 10 has been described in the above description, the same applies to the second sliding contact pieces 11.

When the rotating member 3 rotates, the second cylindrical portion 5 and the third cylindrical portion 6 also rotate, but the first cylindrical portion 5 is moved through the corresponding sliding contact pieces 10, 10, 11, 11 respectively. 4 and the electrical connection with the fourth cylindrical portion 7 is maintained.

In the above-described embodiment, a description has been given of a two-system electrical connection configuration by the combination of the two pairs of sliding contact pieces 10, 10, 11, 11 and the cylindrical portions 4 to 7. However, the present invention is not limited to this. Instead of a single system, a single system or a multi-system configuration may be used as necessary. Further, the sliding contact pieces 10, 10, 11, 11
Is not limited to the configuration in which the contact 12 is fixed. For example, the contact may be substituted by a substantially wave-shaped top T and bottom U. Further, the number of the sliding contact pieces 10, 10, 11, 11 is not limited to one in which one pair is interposed in one system connection configuration, and one or more sliding contact pieces may be provided according to, for example, applications. In addition, each of the gaps 8 and 9 is formed by an imaginary line in FIG. 1 so that the pair of sliding contact pieces 10 and 10 and the sliding contact pieces 11 and 11 move within the gaps 8 and 9 and do not abut. May be provided.

Next, a second embodiment will be described with reference to FIGS. Reference numeral 21 denotes a fixed member, which rotatably supports a rotating member 23 on a rotation center Y via a bearing 22 such as a ball bearing. Reference numerals 24 and 25 denote cylindrical portions having conductivity and having a substantially L-shaped cross section, and are disposed on the same plane with the same rotation center Y. These cylindrical portions 24 and 25 have cylindrical portions hanging down toward the fixing member 21 and are fixed to the rotating member 23 with rivets 26 or the like. Further, the cylindrical portions 24 and 2
Reference numeral 5 includes external terminals 24a and 25a projecting outward from the rotating member 23, and is connected to an external wiring 27 by soldering or the like.

The fixing member 21 faces the inner peripheral surface of each cylindrical portion of the cylindrical portion 24 or 25 on the surface facing the rotating member 23, and has predetermined gaps 28 and 29,
Projections 1a and 21b are provided. Each of the gaps 28 and 29 has at least one sliding contact piece 30, 31 interposed therebetween. Each of the sliding contact pieces 30 and 31 is made of an elastic material such as a conductive plate material, and is made of a cylindrical portion 24, 25 or a cylindrical wall portion 21a.
It is formed in a substantially wave shape along 21b. In addition, the substantially corrugated shape includes a polygonal shape and the like. These sliding contact pieces 30 and 31 fix the contact point 32 to a protruding portion that comes into contact with each of the cylindrical portions 24 and 25, that is, a substantially wave-shaped top To. The height of the substantially corrugated shape of each of the sliding contact pieces 30 and 31 is set to be larger than the separation dimensions S21 and S22 of the gaps 28 and 29 to be fitted respectively as shown in FIG. Therefore, each contact 32 is connected to the sliding contact 3
Due to the urging forces of 0 and 31, they come into pressure contact with the cylindrical portions of the opposite cylindrical portions 24 and 25. Further, each of the sliding contact pieces 30, 31 is slightly compressed in the height direction of the substantially wave shape, while each of the gaps 28, 2 is compressed.
9 and assembled.

The sliding contact pieces 30 and 31 are shown in FIGS.
As shown by, the vicinity of one end 30a and 31a in the extension direction
Two small-diameter cylinders 21 erected from the bottom surface of the fixing member 21
It is supported by being sandwiched by the gap between c and 21c. Thus, the sliding contact pieces 30 and 31 do not rotate together with the cylinders 24 and 25. In addition, each sliding contact 3
One ends 30a and 31a of 0 and 31 are connected to external terminals 35 and 36 via flexible electric wires 33 and 34, respectively. In addition, these electric wires 33 and 34 are connected by spot welding or the like. External terminals 35 and 36
Are integrally formed with the fixing member 21 made of a resin material, project outward, and are connected to the external wiring 37 by soldering or the like.

The sliding pieces 30 and 31 are connected to the cylindrical portion 24.
In order to prevent a chattering phenomenon from occurring due to resonance when sliding with each other, the characteristic between adjacent ones is set at every half pitch of the wave shape as in the configuration of the first embodiment shown in FIG. It is desirable that the frequency be different. Above each of the gaps 28 and 29, annular holding plates 38 and 39 are provided, and sliding contact pieces 30 and 31 are formed from the gaps 28 and 29.
Is prevented from coming off, and good continuity with each of the tubular portions 24 and 25 is maintained. Each holding plate 38 and 39 has a plurality of locking legs 38a, 3 projecting downward as shown in FIG.
9a is mounted by press fitting into a groove or the like formed in the fixing member 21.

Below the fixed member 21, a conventional slip ring device 40 is disposed for transmitting a relatively insignificant normal signal to the rotating member 23 side. The slip ring device 40 includes a fixed base 42 fitted to the fixed member 21 and having a plurality of elastic contact pieces 41 attached to the lower surface, and a plurality of slides fitted to the rotating member 23 and slidably contacting the elastic contact pieces 41. It comprises a rotating disk 44 provided with a dynamic conductor 43. These sliding conductors 43 are formed in a ring shape from a conductive plate material, and are integrally formed with a rotating plate 44 made of a resin material. Further, the sliding conductor 43 is connected to a connection line 45 provided on the back surface.
Through an external terminal 46 integrally formed with the rotating member 23.
Is connected to The external terminal 46 is connected to an external wiring 47. The connection line 45 may be provided by being integrally formed in a sub turntable 50 described later.

Below the slip ring device 40,
A rotation angle detection device 48 for detecting a relative rotation angle between the fixed member 21 and the rotation member 23 is provided. The rotation angle detecting device 48 is attached to the rotating disk 44 and has a plurality of elastic contact pieces 49 attached to the lower surface thereof. It is composed of a board 51. The angle detection board 51 prints and forms a predetermined conductive pattern (not shown) for detecting a rotation angle in cooperation with the elastic contact piece 49.

As shown in FIG. 7, the bearing 22 has a fixed member 21 and a rotating member 23 each having elasticity.
Each end face is locked by a plurality of locking claws 21 d and 23 a, and separation from the fixed member 21 and the rotating member 23 is prevented. The rear surface of the locking claw 21 d on the fixing member 21 side is in contact with the inner peripheral surface of the holding plate 38. Rotating member 23
Of the locking claw 23a is in contact with a tongue piece 44a protruding from the turntable 44. Thus, the holding plate 38 and the tongue piece 4
4a has a function of a regulating member for regulating that each of the locking claws 21d and 23a is elastically deformed and separated from the bearing 22.

In the configuration of the second embodiment, the respective contacts 32 of the respective sliding contact pieces 30 and 31 are pressed against the corresponding cylindrical portions 24 and 25 to make electrical connection. When any of the plurality of contacts 32 separates from the cylindrical portions 24 and 25 due to some impact, the sliding contact pieces 30 and 31 are flattened similarly to the configuration of the first embodiment. The other contact 32 and the cylindrical portions 24 and 2 are elastically deformed.
5 is kept in contact. Therefore, each sliding contact piece 30 and 3
1 always maintains electrical continuity with the cylindrical portions 24 and 25. Each sliding contact piece 30 and 31 has one end 30a and 31a.
The side is supported by the fixing member 21 and is connected to the external terminals 35 and 36 via the electric wires 33 and 34, and the number of the cylindrical portions 24 and 25 may be smaller than that of the configuration of the first embodiment. Is also stable.

In the second embodiment, the cylinder 2
Although the description has been given of the two-system electrical configuration based on the combination of the sliding contacts 4 and 25 and the sliding contact pieces 30 and 31, the present invention is not limited to this, and a single-system or multiple-system configuration may be used as necessary.
Further, any one of the cylindrical portions 24 and 25 and the sliding contact pieces 30 and 31 may be provided as long as one of them is disposed on the fixed member 21 and the other is disposed on the rotating member 23. Further, each of the sliding contact pieces 30 and 31 is not limited to the configuration in which the contact point 32 slides on the inner peripheral surface of the hanging portion in each of the cylindrical portions 24 and 25, and may have a configuration in which it slides on the outer peripheral surface. Further, the sliding contact pieces 30 and 31
Is not limited to the configuration in which the contact 32 is fixed, and the contact may be substituted by, for example, a substantially wave-shaped top To. Further, the number of the sliding contact pieces 30 and 31 is not limited to one provided for each connection configuration of one system, and a desired number may be provided according to the application, for example. Each of the external terminals 24a, 25a, 35, 36 and 46 may be connected to a connector.

[0025]

As described above in detail, according to the structure of the present invention, the occurrence of chattering is prevented, the electrical conduction between the rotating member and the fixed member is stabilized, and the slip ring device having improved reliability is provided. Can be provided. Further, according to the configuration of the first aspect of the invention, the number of the tubular portions is reduced, so that the configuration is simplified, and the electrical connection state on the side where the sliding contact pieces are disposed is improved. According to the configuration of the second invention, the natural frequency of the sliding contact piece formed in a substantially wave shape is different for each part, so that it is possible to prevent the occurrence of chattering phenomenon due to resonance at the time of sliding contact with the cylindrical part, Electrical continuity is stabilized. According to the configuration of the third aspect, the bearing interposed between the fixed member and the rotating member is prevented from being detached from the fixed member and the rotating member. It becomes a ring device.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of a slip ring device according to the present invention, with a rotating member removed.

FIG. 2 is an enlarged cross-sectional view of a state in which a rotating member in the direction of arrows AA in FIG. 1 is mounted.

FIG. 3 is a perspective view of a main part around a first cylindrical part, a second cylindrical part, and a first sliding contact in FIG. 1;

FIG. 4 is a perspective view of a main part of a first sliding contact piece in FIG. 1;

FIG. 5 is an enlarged explanatory view illustrating an operation of a first sliding contact piece in FIG. 1;

FIG. 6 is a sectional view showing a second embodiment of the slip ring device according to the present invention.

FIG. 7 is a cross-sectional view in which a part in the direction of arrows BB in FIG. 6 is omitted.

8 is a reduced cross-sectional view taken along line CC of FIG. 6;

9 is an exploded perspective view of an essential part around one end of a sliding contact piece, an electric wire, and an external terminal in FIG. 8;

[Explanation of symbols]

 1, 21 fixing member 1a, 21d locking claw 2, 22 bearing 3, 23 rotating member 3a, 23a locking claw 4 first cylindrical portion 5 second cylindrical portion 6 third cylindrical portion 7 fourth cylindrical portion 10 first sliding Moving contact piece 11 Second sliding contact piece 14 Pressing plate (restriction member) 16b Tongue piece (restriction member) 24, 25 Tube portion 30.31 Sliding contact piece 38 Pressing plate (restriction member) 44a Tongue piece (restriction member)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) H01R 39/00 B60R 16/02 B62D 1/04 H01R 35/04

Claims (3)

(57) [Claims] 1. A slip ring device for conducting electrical conduction via a sliding contact between a rotating member and a fixed member that rotate relatively concentrically, wherein one of the rotating member and the fixed member is provided. A conductive tubular portion is disposed on the concentric axis, and the other of the rotating member and the fixed member is made of a conductive elastic material, and is formed in a substantially wave shape along the peripheral wall surface of each of the tubular portions. A slip ring device, comprising: a formed sliding contact piece; wherein the sliding contact piece has a protruding portion that comes into contact with each of the cylindrical portions. 2. A slip ring device for conducting electrical conduction via a sliding contact between a rotating member and a fixed member that rotate relatively concentrically, wherein at least one of the rotating member and the fixed member is provided. In addition, a conductive cylindrical portion is disposed on the concentric core, and a sliding contact piece formed of a conductive elastic material in a substantially wavy shape along the peripheral wall surface of the cylindrical portion is provided on the cylindrical portion. The substantially wave-shaped sliding contact pieces are disposed at least every half pitch.
A slip ring device wherein adjacent natural frequencies are different from each other. 3. A slip ring device for conducting electrical conduction via a sliding contact between a rotating member and a stationary member that rotate relatively concentrically via a bearing, wherein the rotating member and the stationary member are provided. At least on one side, a conductive cylindrical portion is disposed on the concentric axis, and a sliding contact piece formed of a conductive elastic material in a substantially wavy shape along the peripheral wall surface of the cylindrical portion, The rotating member and the fixing member are provided in contact with the cylindrical portion, and each of the rotating member and the fixing member includes a locking claw that has elasticity and locks an end surface of the bearing, and separates the locking claw from the bearing. A slip ring device comprising a regulating member for regulating.