JP2550890Y2 - Angle sensor device for work equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an angle sensor device which is mainly mounted on a construction machine such as a hydraulic shovel or a work machine mounted on a front portion of a work vehicle.

[0002]

2. Description of the Related Art FIG. 9 is a side view of a main part of a working machine 1 equipped with a conventional angle sensor device. In the figure,
Reference numeral 2 denotes an arm which is a first member, 3 denotes an idler link which is a second member, 4 denotes a bucket link, 5 denotes a bucket among work tools, 6 denotes a bucket cylinder, and 7 denotes an angle sensor device. FIG. 10 is a cross-sectional view of a main part taken along line AA in FIG. In the figure, 8 is a connecting pin, 9 is a case body,
10 is potentiometer, 11 is potentiometer 10
12 is a flexure joint, 13 is a lever, 14 is a locking pin, 15 is a cover, 16 is a board fixedly mounted on the outer surface of the idler link 3, 17 is a boss fixed to the outer surface of the arm 2, 18, 19 and 20 are bolts, respectively.

Next, the configuration and function of the conventional angle sensor device 7 will be described with reference to FIGS. 9 and 10. FIG. The angle sensor device 7 is attached to the case body 9 such that the axis of the detection shaft 11 of the potentiometer 10 is concentric with the axis of the coupling pin 8. Further, one end of the lever 13 is fixedly attached to the arm (2) side, and the other end of the lever 13 and the detection shaft 11 are connected to each other through a flexure joint 12. This allows the potentiometer 10 to detect the relative angle of the idler link 3 rotated by the expansion and contraction operation of the bucket cylinder 6 with respect to the arm 2.

[0004]

In the angle sensor device of the prior art, a potentiometer is attached to a case body. However, since the case body has a low structural strength, when an external obstacle collides with the case body, the potentiometer is used. In some cases, the axis of the detection shaft and the axis of the coupling pin may be misaligned, and the accuracy of the detection angle may be inaccurate. In addition, since a cover made of a steel plate is attached so as to cover the outer peripheral side of the potentiometer, when the earth and stones collide with the cover, the potentiometer may be damaged together with the cover. In addition, since moisture, earth and sand, etc. enter through the hole of the case body in which the lever swings, maintenance of the potentiometer is improved. In addition, since the harness leading to the potentiometer was wired separately from the lever, there was an accident that the harness was cut off. An object of the present invention is to provide an angle sensor device that can solve the above problems.

[0005]

According to the angle sensor device of the present invention, a second member is rotatably mounted on a first member of a working machine via a connecting pin, and the second member and the connecting pin are integrally formed. Wherein the relative angle of the second member to the first member is detected by a potentiometer, wherein a shaft member is integrated with an outer surface of the second member concentrically with the axis of the coupling pin. The shaft member is provided with a recess formed in the outer surface of the shaft member, and a body is fitted to the outer peripheral portion of the shaft member via a bearing member. A potentiometer is provided on the inner side of the body. And the detection shaft of the potentiometer is fitted in the recess, and the body is fixed to the first member via a lever member. In order to protect the body, a thick cylindrical cover is provided on the outer peripheral surface of the body, and the cover is fixed to the shaft member, and the cover is removed so that the body does not come off. The stop portion was provided.
A seal member is provided to lubricate the rotating sliding surface between the cylindrical outer peripheral surface of the body and the inner peripheral surface of the cover, and to prevent foreign matter from entering the rotating sliding surface from outside. A lubrication port is provided on the outer peripheral surface of the cover, and a spiral groove is formed on the outer peripheral surface of the stopper collar provided on the base end side of the body so that active lubrication is performed when the body and the cover are rotated. . In addition, a ring-shaped plate is interposed between the potentiometer disposed inside the body and the bearing member, and the potentiometer is fixed to the body by tightening the plate with a bolt, and the plate is fixed on the opposite surface of the plate. The positioning of the bearing member is controlled. Further, a concave portion having a diameter larger than the diameter of the coupling pin is formed in the second member mounting surface portion of the shaft member, and a gap is provided between the bottom surface of the concave portion and the distal end surface of the coupling pin. The two sides are prevented from contacting each other when the rattle moves in the axial direction. Also, a rigid tube member is provided as a lever member, and a harness leading to a potentiometer is wired in a hole of the tube member.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows the angle sensor device 21 of the present invention.
FIG. 6 is a partially cutaway plan view of a main part of a working machine 22 equipped with a. FIG. 2 is a detailed view of a portion B in FIG. FIG. 3 is a side view as viewed from C in FIG. FIG. 4 is a view of the body 23 and the cover 24 as viewed from the side. FIG. 5 is a diagram viewed from D in FIG. FIG. 6 is a view seen from E in FIG. FIG. 7 is a plan view of the body 23 shown in FIG. FIG.
FIG. 8 is an enlarged view of a portion F in FIG. 7.

Next, the configuration of the angle sensor device 21 of the present invention will be described with reference to FIGS. In the angle sensor device 21 of the present invention, the idler link 3 ′ is rotatably attached to the arm 2 ′ of the work machine 22 via the connecting pin 25, and the idler link 3 ′ and the connecting pin 25 are tightened with a bolt (26). And an angle sensor device for detecting the relative angle of the idler link 3 ′ to the arm 2 ′ by a potentiometer (27), wherein the coupling pin 25 is attached to the outer surface of the idler link 3 ′. A shaft member 28 is integrally fixed and fastened with a bolt (29) concentrically with the axis, and a concave portion 30 (shown in FIG. 2) is formed in the axis of the outer surface of the shaft member 28. A body 23 is fitted to the outer peripheral portion of the cylinder of the member 28 via a bearing member 31, and a potentiometer 27 is disposed inside the body 23. The detection axis 32 of Nshometa 27 together allowed to fit in the recess 30, and be fixed to the arm 2 'of the body 23 through the lever member 33. In order to protect the body 23, the body 23
A cylindrical cover 24 having a large thickness is disposed on the outer peripheral surface portion of the body, and the cover 24 is fixed to the shaft member 28, and a stepped retaining portion 34 is provided so that the body 23 does not come off. Was provided.

The cylindrical outer peripheral surface of the body 23 and the cover 2
In order to lubricate the rotary sliding surface with the inner peripheral surface of the rotary member 4 and to prevent foreign matter from entering the rotary sliding surface from outside, seal members 35, 36 and 37 are provided. An oil supply port 38 is provided on the outer peripheral surface, and a spiral groove 40 is formed on the outer peripheral surface of a retaining collar 39 (shown in FIGS. 7 and 2) provided on the base end side of the body 23. The lubrication is positively performed when turning. Also, a potentiometer 2 disposed inside the body 23
7, a ring-shaped plate 42 (shown in FIG. 2) is provided between the flange 41 and the bearing member 31, and the plate 42 is tightened with bolts 43 to fix the potentiometer 27 to the body 23. The positioning and holding of the bearing member 31 is performed on the opposite surface of the plate 42.

A recess 44 having a diameter φD larger than the diameter φd (shown in FIG. 2) of the coupling pin 25 is formed in the idler link mounting surface of the shaft member 28.
A gap S is provided between the bottom surface of the connecting pin 4 and the tip end face of the connecting pin 25 so that when the connecting pin 25 rattles and moves in the axial direction, the two surfaces do not abut. Also body 23
Tube member having rigidity (including a pipe member) as the lever member 33 for fixing the arm member to the arm 2 '.
And a harness 45 leading to the potentiometer 27 is wired in a hole of the tube member (referred to as a hole penetrating the inside of the tube member).

Next, the operation of the angle sensor device 21 of the present invention will be described. In the angle sensor device 21, the shaft member 28 is fixedly attached to the idler link 3 ′ and the coupling pin 25. Then, the body 23 to which the potentiometer 27 is attached is connected to the lever member 3.
The arm 2 ′ was fixed via 3, and the detection shaft 32 of the potentiometer 27 was fitted into a concave portion 30 formed in the axis of the shaft member 28. Therefore, when the idler link 3 'is rotated with respect to the arm 2', the relative angle can be detected by the potentiometer 27. A shaft member 2 integrally fixed to the idler link 3 ';
8, the cover 24 is fastened and fixed with bolts 46 (shown in FIG. 2). Since the thickness of the cover 24 is considerably large and is fitted to the outer peripheral surface of the body 23, the cover 24
Even if debris or the like collides with the potentiometer, the potentiometer 27 disposed inside the body 23 may be misaligned,
It will not be damaged. Also body 23 and cover 2
4, a plurality of sealing members 35,
Since the devices 36 and 37 are provided, it is possible to prevent moisture and foreign substances from entering from outside. Also body 2
Since the spiral groove 40 is formed on the outer peripheral surface of the stopper collar 39 provided on the base end side of the base 3, the lubrication grease can be actively lubricated when the body 23 and the cover 24 rotate. Further, since the ring-shaped plate 42 is interposed between the flange 41 of the potentiometer 27 and the bearing member 31, the potentiometer 27 can be sufficiently fixed to the body 23, and the bearing member is provided on the opposite surface of the plate 42. 31 can be positioned and held down, which is structurally convenient. Further, since the concave portion 44 is formed in the idler link mounting surface portion of the shaft member 28, even when the connecting pin 25 rattles and moves, no contact accident occurs with the shaft member 28, and the volume of the concave portion 44 is reduced. By setting the maximum possible range for the shaft member 2
8 can be reduced in weight. Further, a tube member is used as a lever member 33 for fixing the body 23 to the arm 2 ', and the tube member is
7 (shown in FIGS. 2 and 3). As a result, the harness 45 leading to the potentiometer 27 is wired to the hole of the tube member, so that the lever member 33 can function as two birds per stone.

[0011]

According to the angle sensor device of the prior art, the strength of the case body and the cover on which the potentiometer is mounted is weak, so that when it hits with debris or the like, the accuracy is often deteriorated or damaged. In addition, the maintenance of the potentiometer was not good because moisture, earth and sand, etc., entered the inside of the case body. Also, a harness cutting accident leading to the potentiometer was sometimes caused. However, in the angle sensor device of the present invention, the cover member is fastened and fixed to the shaft member, and is fitted to the outer peripheral surface of the body. Moreover, the thickness of the cover is quite thick,
Even if debris or the like collides with the cover, the potentiometer disposed inside the body will not be misaligned or damaged. Further, since a plurality of seal members are provided on the rotating sliding surface between the body and the cover, it is possible to prevent moisture and foreign matter from entering from outside. In addition, since the spiral groove is formed on the outer peripheral surface of the stopper collar provided on the base end side of the body, the lubrication grease can be actively lubricated when the body and the cover rotate. In addition, the ring-shaped plate is interposed between the potentiometer and the bearing member, so that the potentiometer can be sufficiently fixed to the body, and the bearing member can be positioned and held on the opposite surface of the plate, which is structurally convenient. It is. In addition, since a concave hole is formed in the idler link mounting surface of the shaft member, accidental contact with the shaft member does not occur even when the coupling pin rattles and moves, and the volume of the concave hole is limited to the extent possible in terms of strength. By setting the maximum, the weight of the shaft member can be reduced. Further, since a tube member is used as a lever member for fixing the body to the arm, a harness leading to a potentiometer can be wired and protected in a hole of the tube member. Therefore, the angle sensor device of the present invention has sufficient strength against external debris collision, and can exhibit excellent effects in maintaining detection angle accuracy and maintainability.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view showing a working machine equipped with the angle sensor device of the present invention.

FIG. 2 is a detailed view of a portion B in FIG. 1;

FIG. 3 is a side view as viewed from C in FIG. 1;

FIG. 4 is a view of a body and a cover in FIG. 1 as viewed from a side.

FIG. 5 is a view seen from D in FIG. 4;

FIG. 6 is a view as viewed from E in FIG. 4;

FIG. 7 is a plan view of the body shown in FIG. 2;

FIG. 8 is an enlarged view of a portion F in FIG. 7;

FIG. 9 is a side view of a main part of a working machine equipped with a conventional angle sensor device.

FIG. 10 is a cross-sectional view of a main part taken along line AA in FIG. 9;

[Explanation of symbols]

 1,22 work machine 2,2 'arm 3,3' idler link 7,21 angle sensor device 8,25 connecting pin 10,27 potentiometer 11,32 detection shaft 15,24 cover 23 body 28 shaft member 30 concave portion 31 bearing member Reference Signs List 33 lever member 34 retaining part 38 oil supply grease port 39 retaining collar 40 spiral groove 42 plate 44 concave hole 45 harness

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Eiji Shinkotani 6-12-19 Gion, Asa-minami-ku, Hiroshima-shi, Hiroshima Examiner Ryuji Kawashima (56) Reference: 3-89756 (JP, U) Actual opening Hei 4-4213 (JP, U)

Claims (6)

(57) [Scope of request for utility model registration] A second member is rotatably mounted on a first member via a connecting pin, and the second member and the connecting pin are integrally fixed, and a relative angle of the second member with respect to the first member. Angle sensor device, wherein a shaft member is integrally fixed on an outer surface portion of the second member concentrically with an axis of the coupling pin, and a shaft of the outer surface portion of the shaft member is provided. A recess is drilled in the core, a body is fitted to the cylindrical outer peripheral portion of the shaft member via a bearing member, a potentiometer is provided inside the body, and a detection shaft of the potentiometer is fitted in the recess. An angle sensor device for a working machine, wherein said body is fixed and said body is fixed to said first member via a lever member. 2. The angle sensor device for a working machine according to claim 1, wherein a thick cylindrical cover is provided on an outer peripheral surface of the body in order to protect the body. An angle sensor device for a working machine, wherein the cover is fixed to a shaft member and a retaining portion is provided so that the body does not come off. 3. The angle sensor device for a working machine according to claim 2, wherein the lubrication is applied to a rotating sliding surface between a cylindrical outer peripheral surface of the body and an inner peripheral surface of the cover. A seal member is provided on the rotating sliding surface so that foreign matter does not enter from the outside, and a lubrication grease port is provided on the outer peripheral surface of the cover, and on the outer peripheral surface of the stopper collar provided on the base end side of the body. An angle sensor device for a working machine, wherein a spiral groove is formed to positively lubricate the body and the cover during rotation. 4. The angle sensor device for a working machine according to claim 1, 2 or 3, wherein a ring-shaped member is provided between a potentiometer disposed inside the body and the bearing member. An angle sensor device for a working machine, wherein a plate is interposed, the potentiometer is fixed to the body by bolting the plate, and the bearing member is positioned and pressed on the opposite surface of the plate. . 5. The angle sensor device for a working machine according to claim 1, wherein the shaft member has a second member.
A concave hole larger than the diameter of the coupling pin is formed in the member mounting surface, a gap is provided between the bottom surface of the concave hole and the tip surface of the coupling pin, and the coupling pin is loose in the axial direction thereof. An angle sensor device for a working machine, wherein the two surfaces do not come into contact with each other when they move. 6. The angle sensor device for a working machine according to claim 1, wherein the lever member includes:
An angle sensor device for a working machine, wherein a tube member having rigidity is provided, and a harness leading to a potentiometer is wired in a hole of the tube member.