JPH0720210Y2 - Working angle detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a working angle detection device for detecting a rotation angle of a working portion in a construction machine such as a hydraulic power shovel.

(Prior Art) FIG. 5 shows a front working part of a hydraulic excavator,
Boom with support pin 12 for swing frame 11
13 is rotatably attached, and the boom 13 is rotated by the boom cylinder 14 with the support pin 12 as a fulcrum. further,
A stick 16 is rotatably attached to the boom 13 by a support pin 15, and a stick cylinder 17 rotates the stick 16 about the support pin 15 as a fulcrum. Also,
A bucket 19 is rotatably attached to the stick 16 by a support pin 18, and a bucket cylinder 20 rotates the bucket 19 about the support pin 18 as a fulcrum. The bucket cylinder 20 is supported by a link plate 22 rotatably attached to the stick 16 by a support pin 21, and rotates the bucket 19 via a bucket linkage 23.

In the working section of such a construction machine, the support pins 12, 15,
A rotation angle sensor that detects a rotation angle between both members is provided between one member and the other member that are rotatably provided via 21.

For example, in the portion where the stick 16 is pivotally attached by the support pin 15, the main body 31a of the resolver 31 as the rotation angle sensor is fixed to the side mounting portion 32 of the stick 16 with the bolt 33, as shown in FIG. The detection shaft 31b of the resolver 31 is connected to a fixed pin 36 via a coupling 35. The fixing pin 36 is integrally projected from the support pin 15 which is integrated with the boom 13 via a fixing plate 37. Therefore, if there is a rotation between the boom 13 and the stick 16,
An equiangular rotation also occurs between the main body 31a of the resolver 31 and the detection shaft 31b, and the rotation angle of the stick 16 can be detected.

As shown in FIG. 5, a resolver 31 as a rotation angle sensor is also provided for the support pins 12 and 21, and the rotation angle of the boom 13 is detected by the resolver 31 attached to the support pin 12. Moreover, the rotation angle of the bucket 19 can be detected by detecting the rotation angle of the link plate 22 by the resolver 31 attached to the support pin 21.

Therefore, it is possible to easily control the working unit by grasping the movement of each working unit on the front side and interlocking with the hydraulic circuit or the like.

(Problems to be Solved by the Invention) In the conventional working angle detecting device as described above, it is difficult to reliably cover the resolver 31 structurally.
Although the side a can be covered, it is unavoidable that dirt, water, etc. will enter from the side of the detection shaft 31b.
31 may be damaged.

Furthermore, in the conventional lever plate 34, the support pin 15
It is difficult to accurately align the center of the rotation center of the lever plate 34 with the rotation center of the lever plate 34, and it is easy for the centers of both to be displaced, and when the lever plate 34 is deformed, the displacement is also generated. The resolver 31 that is rotated while the center is still displaced is easily damaged.

In addition, since the main body 31a of the resolver 31 is rotated, conventionally, as shown in FIG. 5, it is necessary to provide the wiring 38 drawn from the resolver 31 with slack. However, there is a risk that the wiring 38 may be caught by an obstacle during work.

It is an object of the present invention to provide a working angle detecting device that can protect a rotation angle sensor without making a major modification to a working part of a construction machine and does not require slack in wiring of the rotation angle sensor. It is what

[Constitution of device]

(Means for Solving the Problems) The present invention provides a support pin in a working unit of a working machine of a construction machine.
In the working angle detection device, a rotation angle sensor 43 for detecting a rotation angle between both members is provided between one member 13 and the other member 16 rotatably provided via 15
A recess 42 is provided at the end of the support pin 15 that is integrally attached to
The main body 43a of the rotation angle sensor 43 is housed and integrally attached to the center position of the support pin of the recess 42, and the outer peripheral surface of the end of the support pin 15 is used as a reference surface for attachment, and the other of A rotation transmission ring 52 connected to the member 16 of the rotation transmission plate 54 via a rotation transmission plate 54 is rotatably fitted, and the rotation transmission bracket is centered on the rotation transmission ring 52.
A rotation transmission shaft 65 is attached via 62, and the rotation transmission shaft 65 is connected to the detection shaft 43b of the rotation angle sensor 43 via a coupling 66.
A hermetically-sealed protective cover 72 that is rotationally locked by an engaging member 82 integrally provided with the support pin 15 on the outer peripheral surface of the
Wiring lead-out section provided on this protective cover 72
The wiring 96 of the rotation angle sensor 43 is pulled out through 84,
The outside lead-out portion of the wire 96 is a working angle detection device having a structure in which it is inserted into the tubular protective body 97 connected to the wire lead-out portion 84.

(Operation) According to the present invention, the rotation of the other member 16 relative to the one member 13 causes the rotation transmission plate 54, the rotation transmission ring 52, the rotation transmission bracket 62, the rotation transmission shaft 65 and the coupling.
After passing through 66, it is transmitted to the detection shaft 43b of the rotation angle sensor 43, and an output according to the rotation amount between the members is obtained from the main body 43a of the rotation angle sensor 43 integrally provided in the support pin 15. Since the protective cover 72 is held integrally with the support pin 15 by the engaging member 82 and therefore has an integral relationship with the main body 43a of the rotation angle sensor 43, the rotation angle sensor 4
It is not necessary to give slack to the wires 91 and 96 that are drawn out from the main body 43a of 3 through the wire drawing portion 84 of the protective cover 72 to the outside.

(Embodiment) Hereinafter, the present invention will be described in detail with reference to an embodiment shown in FIGS. 1 to 4. The same members as those in the conventional example shown in FIGS. 5 and 6 are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 3 and FIG. 4, in the front working part of the construction machine, the working angle detecting device A, the rotating fulcrum of the boom 13, the rotating fulcrum of the stick 16, and the rotating fulcrum of the bucket link plate 22 are provided. B and C are provided respectively.

FIG. 1 shows, as an example, a working angle detecting device B provided at an end of a support pin 15 which is a fulcrum of rotation of a stick 16.

As shown in FIG. 1, a recess 42 is provided at the end of the support pin 15 integrally attached to the boom 13 as one member via a fixing plate 41. A main body 43a of the resolver 43 as a rotation angle sensor is housed at a position, and a support 45 in which the main body 43a of the resolver 43 is integrally attached via a flange portion 44 is fitted to the end surface of the support pin 15, and the bolt 46 It is fixed by.

A rotation transmission ring 52 is rotatably fitted via a bush 51 around the outer peripheral surface of the end of the support pin 15 as a mounting reference surface. One end of a rotation transmission plate 54 bent in an L shape is welded to the flange portion 53 of the rotation transmission ring 52, and the other end of the rotation transmission plate 54 is a side surface of the stick 16 as the other member. It is attached to the convex portion 55 with a bolt 56. The L-shaped rotation transmission plate 54 can absorb an impact and an excessive load in the radial direction and the thrust direction.

The inner end portion of the rotation transmission ring 52 is kept airtight and liquid-tight by an O-ring 61 fitted on the inner peripheral surface thereof, and the outer end portion of the rotation transmission ring 52 has a first diameter portion at its outer diameter portion. A rotation transmission bracket 62, which is bridged as shown in FIG. 2, is fixed by bolts 63. This rotation transmission bracket 62
A rotation transmission shaft 65, which is integrally provided at the center of the resolver 43 via a mounting plate 64, detects a shaft of the resolver 43 via a coupling 66.
It is linked to 43b.

An outer end closed cylindrical protective cover 72 is rotatably fitted to the outer peripheral surface of the rotation transmitting ring 52 via a bush 71, and is further fixed to a flange portion 53 of the rotation transmitting ring 52 by a bolt 73. The attached ring 14 slidably engages with the flange portion 75 of the protective cover 72, and the O ring 76 and the oil seal 77 fitted to the inner peripheral surface of the stepped ring 74 are attached to the outer peripheral surface of the protective cover 72. Abutted.

An engagement plate 81 is integrally provided so as to project from the inner peripheral surface of the protective cover 72 in the radial direction, and an engagement pin 82 as an engagement member is axially provided from the support 45 fixed to the end surface of the support pin 15. The engaging plate 81 is integrally projected, and the engaging plate 81 is engaged with the concave groove 83 of the engaging pin 82 to lock the rotation of the protective cover 72. Further, as shown in FIG. 2, a hose connector 84 as a wire drawing portion is screwed into the screw hole on the side surface of the protective cover 72.

The wiring 91 of the resolver 43 passes through the notches 92 and 93 provided in the support pin 15 and the support pin 45, and then one terminal 95 of the connector 95 attached to the support 45 via the receiving portion 94.
The wiring 96 connected to a and connected to the other terminal 95b of the connector 95 is drawn to the outside through the hose connector 84. Use the hose connector 84 to
The hose 97 (FIGS. 3 and 4) as a tubular protector connected to the above is inserted into and protected by the hose 97. Then stick 16 against boom 13
When the rotating shaft rotates, the rotation transmitting ring 52 is also integrally rotated via the rotation transmitting plate 54, and together with this rotation transmitting ring 52, the detection shaft 43b of the resolver 43 via the rotation transmitting bracket 62, the rotation transmitting shaft 65, and the coupling 66. Is rotated, and the body 43 of the resolver 43 that is in an integral relationship with the boom 13
An output corresponding to the rotation amount of the stick 16 is obtained from a.

At this time, since the main body 43a of the resolver 43, the connector 95 and the protective cover 72 do not rotate, the wiring 91, 96 from the main body 43a of the resolver 43 to the hose connector 84 via the connector 95.
Does not move at all. Therefore, the wirings 91 and 96 do not need a slack for rotation. Similarly, as shown in FIGS. 3 and 4, the wiring drawn out from the hose connector 84 can be the shortest.

Similarly, the support pin 1 which is the rotation fulcrum of the boom 13
2. Working angle detectors A and C are also provided on the support pins 21 (see FIG. 5), which are rotation fulcrums of the bucket link plate 22. The support pin 12 is provided integrally with the swing frame 11, and the support pin 21 is provided integrally with the stick 16, both of which are fixing members.

The rotation angle sensor of the present invention is not limited to the resolver of the embodiment, and a potentiometer, synchro, etc. may be used.

[Effect of device]

According to the present invention, the rotation angle sensor and the internal wiring are reliably sealed by the protective cover attached to the end of the support pin by a simple modification, so that they can be protected from earth and sand and water. In particular, the working angle detecting device can be used underwater because it has a completely waterproof structure in which the tubular protective body ensures waterproofing at the wiring drawing portion for drawing the internal wiring from the protective cover.

Further, the rotation angle sensor centered on the support pin and the rotation transmission shaft centered on the rotation transmission ring are accurately measured by the rotation transmission ring that is rotatably fitted around the outer peripheral surface of the end portion of the support pin as a mounting reference surface. Since the position of the rotation angle sensor can be aligned, and the positional relationship is unlikely to be distorted, an unreasonable external force is not applied to the rotation angle sensor, and the rotation angle sensor can be effectively prevented from being damaged. Since this rotation transmission ring is provided, even if a deviation occurs in the radial direction and the thrust direction between one member and the other member, the rotation transmission plate can apply an impact and an excessive load to the radial direction and the thrust direction. It can absorb and protect the rotation angle sensor.

In addition, since the protective cover has a protective structure that covers the entire structure independently of the rotation transmission system such as the rotation transmission ring and the rotation transmission bracket, it is robust against external force (impact force) and the rotation angle sensor It is excellent in that it can be reliably protected.

Further, the rotation of the protective cover is locked by an engaging member that is integrally provided with a support pin to which the main body of the rotational angle sensor is attached, and the rotation angle sensor is externally exposed through a wiring lead-out portion provided in the protective cover. Since the wiring is pulled out, the main body of the rotation angle sensor and the wiring are mounted on the same fixed side, and the shortest wiring is possible without causing slack in the internal wiring and the external wiring.

[Brief description of drawings]

1 is a sectional view showing an embodiment of the working angle detecting device of the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a hydraulic power shovel equipped with the working angle detecting device. Fig. 4 is a plan view showing the front working part of Fig. 4, Fig. 4 is a front view thereof, Fig. 5 is a front view of the front working part showing wiring problems of the conventional working angle detecting device, and Fig. 6 is a conventional working angle. It is sectional drawing which shows a detection apparatus. 13 ... Boom as one member, 15 ... Support pin, 16 ... Stick as other member, 42 ... Concave, 43 ... Rotation angle sensor, 43a ... Main body, 43b ... Detecting shaft, 52 ...... Rotation transmission ring, 54 …… Rotation transmission plate,
62 …… Rotation transmission bracket, 65 …… Rotation transmission shaft,
66 ... Coupling, 72 ... Protective cover, 82 ... Engaging pin as an engaging member, 84 ... Hose connector as a wire drawing portion, 91, 96 ... Wiring.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Nobuyuki Kobayashi 1-3-2 Kita-Aoyama, Minato-ku, Tokyo New Caterpillar Mitsubishi Corporation (72) Yuichi Hayada 7-1-1 Wadamiyadori, Hyogo-ku, Kobe, Hyogo No. 14 Inside Nishiryo Engineering Co., Ltd. (72) Inventor Kimihiko Kanaguchi 7-1-14 Wadamiyadori, Hyogo-ku, Kobe-shi, Hyogo Within Nishiryo Engineering Co., Ltd. (56) Reference JP-A-59-81504 (JP, A) ) Actual public Sho 63-26440 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A rotation angle sensor for detecting a rotation angle between both members is provided between one member and the other member which are rotatably provided via a support pin in a working section of a construction machine. In the working angle detection device, a recess is provided at the end of the support pin integrally attached to one member, and the main body of the rotation angle sensor is housed and integrally attached at the center position of the support pin of the recess,
A rotation transmission ring, which is connected to the other member via a rotation transmission plate, is rotatably fitted around the outer peripheral surface of the end of the support pin as a mounting reference surface, and is rotated around the center of the rotation transmission ring. A rotation transmission shaft is attached via a transmission bracket, the rotation transmission shaft is connected to a detection shaft of the rotation angle sensor via a coupling, and is integrally provided on the outer peripheral surface of the rotation transmission ring with the support pin. A closed type protective cover that is rotationally locked by the engaging member is fitted, the wiring of the rotation angle sensor is drawn to the outside through the wiring lead-out portion provided in this protective cover, and the outside lead-out portion of this wiring is the wiring. A working angle detection device characterized by being inserted into a tubular protective body connected to a drawer.