JP2531515Y2 - Lock structure of ring nut of hydraulic motor with casing rotation type reduction gear - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a reduction gear casing which is applied to a hydraulic motor (an insulated motor) having a casing rotary type reduction gear for a construction machine such as a power shovel or the like for running a special vehicle or for rotating a winch drum. The present invention relates to a stopper for a ring nut for holding a bearing that connects a hydraulic motor casing.

[0002]

2. Description of the Related Art For traveling of construction machines such as power shovels,
2. Description of the Related Art Conventionally, a rotary drive device of an insulation motor for rotating a winch drum is composed of a hydraulic motor and a speed reducer, as shown in FIG. Here, between the outer periphery of the casing 1 of the axial piston type hydraulic motor and the casing 4 of the speed reducer, the large-diameter bearings 2 are coaxially arranged.
As a bearing retainer, a large diameter ring nut 5 is screwed onto the outer periphery of the inner end of the casing 1 of the hydraulic motor to assemble both casings of the hydraulic motor and the reduction gear unit.

[0003]

Conventionally, a set screw 6 is employed as a detent or locking means for the ring nut 5, as shown in an enlarged view and a front view of a portion IV in FIG. This type of locking means has the following problems. (1) The thickness of the ring nut is restricted in order to make the driving device compact, and therefore the set screw 6 cannot be sufficiently hooked and the set screw is easily loosened. (2) Once the set screw is loosened, play of the screw occurs, and the rotational force of the ring nut cannot be fixed properly. (3) Even if the small screw of the set screw is swaged, the set screw comes out with a slight screw torque. (4) It is necessary to make a tapped hole in the screw hole for inserting the set screw after the ring nut 5 is assembled to the motor casing 1, and it is troublesome to perform tapping even if only the prepared hole (round hole) is used. is there. (5) The set screw requires a hexagonal hole or the like for insertion and is not solid, and thus is easily broken.

The present invention has been proposed in view of the above circumstances, and provides a lock structure of a ring nut of a hydraulic motor with a casing rotary type reduction gear that is easy to process, strong, and has no risk of loosening. The purpose is to:

[0005]

SUMMARY OF THE INVENTION To this end, the present invention provides a rotary drive unit comprising a hydraulic motor and a casing rotary type reduction gear unit. In the stop structure, an axial pin is inserted between the motor casing and the ring nut, and the pin is pressed directly or through a washer on the lower surface of the head of the axial set bolt so that the pin does not come off. It is characterized by having done.

[0006]

According to such a configuration, the following operation is performed. (1) A solid pin having no hexagonal hole in the head can be used as a pin, and strength can be improved. (2) Since the pin hole is a straight round hole, the play between the pin and the ring nut can be reduced by reducing the gap. Since it is a straight round hole and has no screw, the gap is constant without loosening of the screw or the like. (3) The screw length of the retaining bolt can be made sufficiently long because the bolt is attached to the motor casing 1. (4) Since the pin receives the rotational force of the ring nut and indirectly presses the pin with the head of the bolt, a large force is not applied to the screw of the bolt. Therefore, the bolt does not become loose.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall vertical sectional view, and FIG. 2 is an enlarged view and a front view showing a portion II in FIG.

In the upper figure, the same reference numerals as those in FIGS. 3 and 4 denote the same members as those in the same figure.
4 differs from the structure of FIG. 4 in that a straight pin is used instead of the set screw, and this is set with the head of a set bolt. That is, in FIGS. 1 and 2, bearings 2 and 3 are inserted between the outer periphery of the casing 7 of the hydraulic motor and the casing 4 of the reduction gear,
As a bearing retainer, a ring nut 8 is screwed coaxially with the outer periphery of the casing 7 of the motor. To prevent the rotation of the ring nut 8, a round hole is formed in a state where the ring nut 8 is mounted on the motor casing 7, an axial pin hole 12 is formed, and a straight pin 9 is inserted therein. Attach the set bolt 11 to the drilled tapped hole for the bolt in the axial direction.
0 or press directly with the set bolt head without using a washer. In addition, pin hole 1
The pin to be inserted into 2 may be a spring pin in addition to the straight pin.

[0009]

According to this structure, the following effects can be obtained. (1) The loosening force of the ring nut can be received by the pin without play, and the bolt can be indirectly held down by the head of the bolt to prevent the pin from coming off. Further, the rotation of the ring nut can be reliably prevented by, for example, making the depth of the screw of the bolt sufficiently large. (2) The co-hole processing for pin insertion does not require tapping such as a set screw. The taps for the bolt holes need only be processed on the motor cover 7. (3) A solid pin can be used as a pin to improve strength.

[0010] In short, according to the present invention, in a screw type ring nut detent structure for holding down a bearing between a motor casing and a reduction gear casing of a rotary drive device composed of a hydraulic motor and a casing rotation type reduction gear section,
By inserting an axial pin between the motor casing and the ring nut, and holding the pin directly or through a washer on the lower surface of the axial set bolt head so that the pin does not come out, Easy to process and strong,
The present invention is extremely useful in industry because a ring nut lock structure of a hydraulic motor with a casing rotary type reduction gear that is safe and secure without being loosened is obtained.

[Brief description of the drawings]

FIG. 1 is an overall vertical sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged view and a front view showing a part II in FIG. 1;

FIG. 3 is an overall vertical cross-sectional view showing a conventional rotation preventing structure of a ring nut for holding down a bearing, which connects a reduction gear casing of a motor and a hydraulic motor casing.

FIG. 4 is an enlarged view and a front view showing an IV section in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic motor casing 2 Bearing 3 Bearing 4 Reduction gear casing 5 Ring nut 7 Motor casing 8 Ring nut 9 Straight pin 10 Washer 11 Set bolt 12 Pin hole

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Yayanagi 6-16-1, Hinoshima Enoshimaura-cho, Shimonoseki City, Yamaguchi Prefecture Inside Mitsubishi Heavy Industries, Ltd. Shimonoseki Shipyard (72) Inventor Tadashi Ishihara Enoshima Island, Hikoshima Shimonoseki City, Yamaguchi Prefecture 6-16-1, Machi Shimonoseki Shipyard, Mitsubishi Heavy Industries, Ltd. (56) References JP-A-59-97317 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A screw-type ring nut detent structure for holding down a bearing between a motor casing and a reduction gear casing of a rotary drive device comprising a hydraulic motor and a casing rotary type reduction gear unit. A casing rotary type deceleration wherein an axial pin is inserted between nuts, and the pin is held directly or through a washer on the lower surface of the head of the axial set bolt so that the pin does not come off. Lock structure of ring nut of hydraulic motor with machine.