JP3343511B2 - Electric and hydraulic swivel joints for construction machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic excavator having an upper revolving structure mounted on a lower traveling structure so as to be revolvable,
The present invention relates to a swivel joint device applied to a hydraulically driven construction machine such as a hydraulic crane, and more particularly to an electric / electrical system suitable for connecting a hydraulic system and an electric system on a lower traveling body side to a hydraulic system and an electric system on an upper revolving body side, respectively. The present invention relates to a hydraulic swivel joint device.

[0002]

2. Description of the Related Art A conventional apparatus is disclosed in Japanese Patent Laid-Open No. 4-366.
No. 233 is known. About this structure, the electric and
FIG. 2 showing an enlarged cross section of a hydraulic swivel joint device.
A description will be given with reference to FIG. 3 (partial cross-sectional view), which is an enlarged cross-sectional view of the slip ring in FIG.

[0003] In the drawing, reference numeral 1 denotes an undercarriage provided with a hydraulic system and an electric system located on the lower side, and 2 denotes an upper revolving structure capable of turning in a horizontal plane on the undercarriage 1. The body 2 is provided with a hydraulic system and an electric system located on the upper side.

[0004] Reference numeral 3 denotes an electric / hydraulic swivel joint device provided between the lower traveling body 1 and the upper revolving superstructure 2 and connecting the upper and lower hydraulic systems and the electric system, respectively.

[0005] The swivel joint device 3 is inserted into a cylindrical body 3a coaxially fixed to the center of rotation of the upper rotating body 2 in the lower traveling body 1, and is inserted into the body 3a so as to be rotatable relative to the body 3a. And a stopper (engaging portion) 4 attached to the outer peripheral surface of the spindle 3b by a fixing bolt 3c to lock the spindle 3b on an engaging member 2a provided on the upper rotating body 2. The upper and lower hydraulic systems communicate with each other via a first hydraulic port (not shown) formed on the body 3a and a second hydraulic port (not shown) formed on the spindle 3b. It has a structure to do.

Reference numeral 5 denotes a slip ring mounted on the upper portion of the spindle 3b via a slip ring mounting member 7. The slip ring 5 supports a ring 5a, a brush 5e sliding on the ring 5a, and a ring. And a connecting member 5g fixed to the ring 5a. Reference numeral 2b denotes wiring on the upper revolving unit side connected to the brush 5e.

A brush 5e is arranged inside the housing 5b of the slip ring 5, and the housing 5b is connected to the upper portion of the spindle 3b via the slip ring mounting member 7 by a plurality of fixing bolts 5c and 5d.

A through hole 3d is formed in the vertical axis direction of the spindle 3b. An upper end of the through hole 3d is connected to the connecting member 5g of the slip ring 5 and an annular hole provided at the lower end. A pipe-shaped spindle connecting member 6 whose mounting portion 6b is locked to the body 3a via a cover 8 by a plurality of fixing bolts 8a, 8b is inserted.

Reference numeral 3e denotes an annular locking plate slidably fitted on the connecting surface between the body 3a and the cover 8, and this locking plate 3e is provided on a stepped surface on the lower end side of the spindle 3b. It is fixed by a fixing bolt 3f.

A wiring 1a of the electric system on the lower side of the lower traveling body 1 is connected to a communication hole 6 penetrating through the spindle connecting member 6.
a and the connection hole 5h of the connecting member 5g, is connected to the ring 5a of the slip ring 5, and is connected to the brush 5e of the slip ring 5 to which the wiring 2b of the electric system on the upper side of the upper swing body 2 is connected. Therefore, the upper and lower electric systems are connected by the slip ring 5, respectively.

[0011]

In the above-described conventional electric / hydraulic swivel joint device 3, a stopper (engaging portion) for engaging the spindle 3b with an engaging member 2a provided on the upper swing body 2. 4 is mounted on the outer peripheral surface of the spindle 3b, it is necessary to arrange the second hydraulic port (not shown) on the outer peripheral surface of the spindle 3b at a vertical position avoiding this mounting portion.

Therefore, the amount of protrusion of the spindle 3b projecting upward from the body 3a is increased, and as a result, the height of the spindle 3b projecting from the frame of the upper revolving unit 2 is increased, and the revolving motor and the like disposed on the upper revolving unit 2 The arrangement space of other components (structures, equipment, piping) was restricted. In addition, the situation is unfavorable in avoiding contact with other members.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric / hydraulic swivel joint device for a construction machine which can solve the above-mentioned problem and can reduce the height of a spindle projecting above an upper rotating body.

[0014]

According to the present invention, there is provided a construction machine having an upper revolving unit rotatably mounted on a lower traveling unit. A cylindrical body is installed at the center of rotation of the upper revolving structure in the traveling structure, and a spindle having a through hole penetrating in the vertical axis direction is rotatably inserted into the body, and the spindle is protruded from the body. A slip ring provided with a ring and a brush for electrically connecting the wiring on the lower traveling structure side and the wiring on the upper revolving structure side with the upper revolving structure at the portion where Provided on the upper part, a spindle connecting member that connects the upper end side to the slip ring and the through hole is disposed, and a hydraulic system and an electric system on the lower traveling body side and a hydraulic system on the upper revolving body side and It applied the exhaust system to the electro-hydraulic swivel joint device with connected.

A feature of the structure adopted in the first aspect of the present invention is that the slip ring mounting member is provided with an engaging portion for engaging with a locking member on the upper rotating body.

According to the above construction, the position of the engaging portion for engaging with the locking member on the upper revolving unit is set at a position other than the outer peripheral portion of the spindle, so that the protruding height of the spindle above the upper revolving unit. Can be lowered.

Further, in the invention of claim 2, the engaging portion is formed so as to protrude at an arbitrary position on the outer peripheral portion of the slip ring mounting member.

According to the above construction, the position of the engaging portion for engaging with the locking member on the upper revolving unit is set at an arbitrary position on the outer peripheral portion of the slip ring mounting member other than the outer peripheral portion of the spindle. This allows the height of the spindle to protrude above the upper rotating body to be reduced,
The number of constituent parts can be reduced.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in which electric and hydraulic power-driven construction machines are applied similarly to the prior art.
FIG. 1 showing an enlarged cross section of a hydraulic swivel joint device.
(Cross section) will be described. Note that FIG.
The same components as those shown in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, reference numeral 1 denotes an undercarriage provided with a hydraulic system and an electric system located on the lower side, and 2 denotes an upper revolving body capable of revolving in a horizontal plane on the undercarriage 1, and an upper revolving body thereof. The body 2 is provided with a hydraulic system and an electric system located on the upper side.

Reference numeral 13 denotes an electric / hydraulic swivel joint device which is provided between the lower traveling unit 1 and the upper revolving unit 2 and connects the upper and lower hydraulic systems and the electric system, respectively.

The swivel joint device 13 is inserted into a cylindrical body 3a coaxially fixed to the center of rotation of the upper swing body 2 in the lower traveling body 1, and is inserted into the body 3a so as to be rotatable relative to the body 3a. And upper and lower parts via a first hydraulic port (not shown) formed in the body 3a and a second hydraulic port (not shown) formed in the spindle 13b. Is provided with a structure for communicating with the hydraulic system.

Reference numeral 5 denotes a slip ring mounted on the upper portion of the spindle 13b via a slip ring mounting member 17, and a wiring 1 of an electric system on the side of the lower traveling body 1.
a is electrically connected to the wiring 2b of the electric system on the upper rotating body 2 side.

The housing 5b of the slip ring 5 is connected to the upper part of the spindle 13b via the slip ring mounting member 17 by a plurality of fixing bolts 5c and 5d.

A through hole 13d is formed in the vertical axis direction of the spindle 13b.
The upper end is connected to the connection member 5g of the slip ring 5, and the annular mounting portion 16b provided at the lower end is connected to the body 3a via the cover 8 by a plurality of fixing bolts 8a, 8b.
, A pipe-shaped spindle connecting member 16 locked therein is inserted.

Reference numeral 3e denotes an annular locking plate slidably fitted on the connection surface between the body 3a and the cover 8, and the locking plate 3e is provided with a plurality of stepped surfaces on the lower end side of the spindle 13b. It is fixed by a fixing bolt 3f.

The wiring 1a of the electric system on the lower side of the lower traveling structure 1 is connected to the ring of the slip ring 5 through the communication hole 16a and the connecting member 5g penetrating through the spindle connecting member 16, and The wiring 2b of the electric system on the upper side is connected to the brush of the slip ring 5 to be connected. Therefore, the upper and lower electric systems are connected by the slip ring 5, respectively.

The slip ring mounting member 17 is formed in a concave shape, and a bottom portion thereof has a hole 17a through which the spindle connecting member 16 passes, and is connected to the housing 5b of the slip ring 5. An annular flange 17b is formed on the side. This brim 17
A rod-shaped engaging portion 17c engaged with the upper bifurcated portion 12b of the engaging member 12a provided on the upper swing body 2 is integrally formed at the outer peripheral position of b.

With the above configuration, the spindle 13b of the swivel joint device 13 is connected to the engaging member 12a provided on the upper revolving unit 2 via the engaging portion 17c formed on the flange portion 17b of the slip ring mounting member 17. Since it is locked, the spindle 13b relatively rotates within the body 3a when the upper swing body 2 turns with respect to the lower running body 1.

At this time, the upper and lower hydraulic systems are connected via a first hydraulic port (not shown) formed on the body 3a and a second hydraulic port (not shown) formed on the spindle 13b. The communication state is maintained, and the upper and lower electric systems are maintained in the communication state by the slip ring 5.

Further, by providing an engaging portion 17c for engaging the engaging member 12a provided on the upper revolving unit 2 on a portion other than the spindle 13b, that is, on the slip ring mounting member 17, The protrusion height above the body 2 is reduced, so that the amount of space restriction on the upper swing body 2 can be suppressed, and the spindle 13b
The arrangement of the second hydraulic port formed on the spindle 13b
Can be efficiently selected for the entire outer circumference.

This is also a favorable situation in avoiding contact with other members.

Further, since the engaging portion 17c is formed integrally with the flange portion 17b of the slip ring mounting member 17, a fixing bolt for mounting is not required, and the number of components can be reduced.

In the above embodiment, the engaging portion 17c is formed on the flange portion 17b of the slip ring mounting member 17, but the engaging portion is integrally formed on the outer peripheral surface of the slip ring mounting member 17 other than the flange portion 17b. Even if formed,
A similar effect can be obtained.

In the above embodiment, the collar portion 17b
The engagement portion 17c is formed integrally with the slip ring attachment member 17 other than the collar portion 17b or the collar portion 17b.
The same operation can be obtained even when the engaging portion is separately attached to the outer peripheral surface portion of the above.

[0036]

The electric power of the construction machine according to the present invention described above.
According to the hydraulic swivel joint device, the projecting height of the spindle above the upper rotating body can be reduced, so that the amount of space restriction on the upper rotating body can be suppressed, and the second hydraulic port formed in the spindle can be formed. There is an effect that the arrangement of the spindle can be efficiently selected with respect to the spindle.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an electric / hydraulic swivel joint device applied to a hydraulic construction machine according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an electric / hydraulic swivel joint device applied to a conventional hydraulic construction machine.

FIG. 3 is an enlarged partial cross-sectional view showing a portion of a slip ring in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body 1a Wiring 2 Upper revolving superstructure 2b Wiring 3a Body 5 Slip ring 5a Ring 5b Housing 12a Engaging member 13 Swivel joint device for electric and hydraulic 13b Spindle 13d Through hole 17 Slip ring mounting member 17a Hole 17b Collar 17c Joint

Claims (2)

(57) [Claims] 1. A construction machine comprising an upper revolving structure rotatably mounted on a lower traveling structure, wherein a cylindrical body is installed at a turning center of the upper revolving structure in the lower traveling structure. A spindle having a through-hole penetrating in the vertical axis direction is rotatably inserted into the body, and the spindle is locked to the upper revolving structure at a portion protruding from the body, and wiring on the lower traveling structure side and upper revolving structure side A slip ring provided with a ring and a brush for electrically connecting the wiring to the upper portion of the spindle via a slip ring mounting member,
A spindle connecting member having an upper end connected to a slip ring and having the through hole inserted therein is disposed, and a wiring for the lower traveling body is passed inside the spindle connecting member, and a hydraulic system and an electric system for the lower traveling body are turned to the upper part. In an electric / hydraulic swivel joint device in which a body-side hydraulic system and an electric system are connected to each other, the slip ring mounting member is provided with an engaging portion that engages with a locking member on the upper rotating body. Electrical and hydraulic swivel joint equipment for construction machinery. 2. The electric and hydraulic swivel joint device for a construction machine according to claim 1, wherein said engaging portion is formed so as to protrude at an arbitrary position on an outer peripheral portion of said slip ring mounting member.