JPH04272094A - Electric motor driven chain block - Google Patents

Abstract

PURPOSE:To cheapen a cost of manufacture for an electric motordriven chain block while easily and promptly performing assembly thereof by decreasing a number of parts for constituting the electric motordriven chain block. CONSTITUTION:In the case of an electric motor-driven chain block in which a reduction gear mechanism, provided with a torque limiter and a mechanical brake, is interposed between a drive shaft 2 rotated by an electric motor 1 and a rotary shaft 4 provided with a load sheave 3, a brake receiving board 8 for supporting a braking ratchet wheel 10 is engaged with a side surface of a large diametric shaft part 14, provided in a side of the load sheave 3 of the rotary shaft 4, to arrange a retaining board pressing spring member 15, pressed by an adjusting nut 13, in an external surface of a retaining board 7 for retaining a driven gear 5.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric chain hoist having a gear reduction section equipped with a torque limiter and a mechanical brake.

0002

[Prior Art] Conventionally, electric chain hoists equipped with torque limiters and mechanical brakes have
An electric chain hoist having a structure disclosed in Japanese Patent Publication No. 2-41514 is known.

0003

[Problems to be Solved by the Invention] In the case of the conventional electric chain hoist, a support ring is fitted to the intermediate shaft between the intermediate drive gear and the brake receiver, and
Since the support member is fitted on the outside of the support ring,
As the number of parts that make up an electric chain hoist increases,
The drawbacks are that assembly is complicated and takes a long time, and the manufacturing cost of the electric chain hoist is high.

0004

[Means for Solving the Problems] In order to eliminate the above-mentioned drawbacks, the present invention provides a torque limiter and a mechanical A gear reduction mechanism equipped with a brake is interposed, and a cam holding member 6 provided inside a driven gear 5 in the gear reduction mechanism is fitted onto the rotating shaft 4, and one side of the cam holding member 6 is fitted. A presser plate 7 and a brake receiving plate 8 arranged on one side and the other side are slidably but unrotatably fitted, and a brake pawl 10 that engages with a brake pawl piece 9 is connected to the driven gear 5. A cam groove 11 is provided on the side of the cam holding member 6 and the depth thereof varies along the circumferential direction of the rotation shaft, which is interposed between the cam groove 11 and the brake receiving plate 8;
In the electric chain block, a brake release cam member 12 is fitted into the cam groove 11, and an adjustment nut 13 for adjusting the pressing force of the presser plate 7 is screwed onto the rotating shaft 4. , a presser plate pressing spring member 15 is engaged with a side surface of a large diameter shaft portion 14 provided on the load sheave 3 side of the rotating shaft 4, and is pressed against the outer surface of the presser plate 7 by the adjustment nut 13. It is located.

[0005]

[Embodiment] FIGS. 1 to 6 show a first embodiment of the present invention, in which a drive gear 16 is provided on a drive shaft 2 rotated by an electric motor 1, and an intermediate driven gear fixed to an intermediate shaft 17. The gear 18 is meshed with the drive gear 16, and a large diameter shaft portion 14 is integrally provided at one end of the rotating shaft 4 arranged parallel to the intermediate shaft 17, and a load sheave 3 is attached to the large diameter shaft portion 14. an annular driven gear 5 that meshes with an intermediate drive gear 19 that is formed integrally with the intermediate shaft 17;
is arranged concentrically with the rotating shaft 4, and is fitted inside the driven gear 5 so that the outer peripheral portion of the cam holding member 6 does not rotate relatively, and is rotatable inside the cam holding member 6. The bearing ring 20 is fitted to the rotary shaft 4 so as to be slidable and not rotate relative to the rotating shaft 4.

[0006] The presser plate 7 and the brake receiver plate 8, which are arranged on one side and on the other side of the driven gear 5 and the cam holding member 6, are slidable and relatively rotatable with respect to the rotating shaft 4. The outer surface of the brake receiving plate 8 is engaged with the side surface of the large-diameter shaft portion 14 of the rotating shaft 4, and the press ring 21 fitted on the rotating shaft 4 on the outside of the presser plate 7, A presser plate pressing spring member 15 consisting of a plurality of disc springs that presses the presser plate 7 is fitted, and a brake pawl 10 is mounted on a boss provided inside the brake receiver plate 8 via a cylindrical bearing 22. A thrust bearing 23 is interposed between the cam holding member 6 and the brake receiving plate 8, and a thrust bearing 23 is interposed between the holding plate 7, the driven gear 5, the brake pawl 10, and the brake receiving plate 8. Friction plates 24, 25, and 26 are interposed therein.

A plurality of arc-shaped cam grooves 11 are provided on the side of the cam holding member 6 facing the presser plate 7 and are arranged concentrically with the rotating shaft 4, and brakes made of steel balls are provided in the cam grooves 11. The loosening cam member 12 is fitted, the presser plate 7 is provided with an annular groove 27 having an arcuate cross section into which the protrusion of the cam member 12 protruding from the cam holding member 6 is fitted, and the friction plates 24, 25 are The friction plate 26 is fixed to the side surface of the driven gear 5, and the friction plate 26 is fixed to the side surface of the ratchet wheel 10.

A support shaft 28 connected to the other end of the rotating shaft 4 and the side of the load sheave 3 is supported by a frame 29 of the electric chain hoist via bearings 30 and 31. An oil seal 33 is fitted between the spacer 32 fitted to the rotating shaft 4 and the frame 29, and an oil seal 34 is fitted between the large diameter shaft portion 14 and the frame 29. An adjusting nut 13 for tightening the spring member 15 and a lock nut 35 are screwed into the male threaded portion provided at the other end via the spacer 32, bearing 30, and press ring 21. The brake pawl piece 9 that engages with the brake pawl wheel 10 is pivotally attached to the frame 29, and an engagement spring 36 is locked to the pawl piece 9, and a load chain for hoisting a load onto the load sheave 3 is attached. (not shown) is wrapped around it.

The presser plate pressing spring member 15 tightened by the adjustment nut 13, the brake receiver plate 8, the presser plate 7 interposed between them, the driven gear 5, the brake pawl 10, and the friction plates 24, 25. , 26 constitute a torque limiter, and is held by the brake receiving plate 8 and the presser plate pressing spring member 15 via the presser plate 7, the driven gear 5, and each friction plate 24, 25, 26. The ratchet wheel 10, the brake claw piece 9 that engages with the ratchet wheel 10, the cam holding member 6 having the cam groove 11, and the brake release cam member 12 fitted into the cam groove 11 form a mechanical mechanism for preventing suspended loads from falling. Brakes are configured.

Next, the operation of the electric chain hoist of the first embodiment will be explained. When the drive shaft 2 is rotated in the hoisting direction by the electric motor 1, the cam holding member 6 is rotated via the gear reduction mechanism, but since the direction of rotation is in the direction of arrow A in FIG. 12 is the cam groove 11
Therefore, the driven gear 5, presser plate 7, brake pawl 10, brake receiver 8, and each friction plate 24, 25, 26 are tightened with a preset tightening force. The rotation of the gear 5 is transmitted to the rotary shaft 4 via the holding plate 7 and the brake receiving plate 8, and therefore the hoisting operation is performed within the torque range set by the torque limiter.

Next, when the drive shaft 2 is rotated in the downward direction by the electric motor 1, the cam holding member 6 is rotated in the opposite direction, that is, in the direction of arrow B in FIG. The member 12 is moved to a shallow position in the cam groove 11, and the amount of protrusion of the brake release cam member 12 from the side surface of the cam holding member 6 increases, and as shown in FIG. Since the holding member 6 and the presser plate 7 are relatively moved apart, the mechanical brake is relaxed, and the load sheave 3 and the rotating shaft 4 are rotated faster than the rotational speed of the electric motor 1 due to the hanging load. However, the rotation tightens the mechanical brake, and as a result of this repetition of loosening and tightening, the hoisting operation is performed at a speed close to that of rotation by the electric motor.

7 to 16 show a second embodiment of the present invention, in which a support ring 38 having an intermediate flange 37 is attached to a boss 36 connected to the inside of the brake receiver 8.
is fitted slidably and unrotatably, and a brake pawl wheel 1 is fitted on the brake receiver 8 side of the support ring 38.
0 is rotatably fitted through a cylindrical bearing 22, and a clutch disc 39 is rotatably fitted through a cylindrical bearing 40 to the cam holding member 6 side of the support ring 38, and the brake pawl is rotatably fitted through a cylindrical bearing 40. A plurality of interlocking rotation pins 41 are inserted between the wheel 10 and the clutch disc 39, and the intermediate flange 3
7 and between the ratchet wheel 10 and the clutch disc 39,
Friction plates 42 and 43 are interposed.

A plurality of arc-shaped first clutch grooves 45 having an inclined bottom surface 44 are provided on the side of the clutch disc 39 facing the driven gear 5, and the side of the driven gear 5 facing the clutch disc 39 is provided with a plurality of arcuate first clutch grooves 45 having an inclined bottom surface 44. , a plurality of second clutch grooves 47 having an inclined bottom surface 46 are provided, and a clutch member 48 made of steel balls is disposed in the second clutch grooves 47, but the other configuration is the same as that of the first embodiment. The same is true.

FIG. 15 shows the state of the brake control device and clutch device when the electric chain block is hoisted, and the brake release cam member 12 in the brake control device is disposed at a deep position in the cam groove 11. Since the brake device is operated and the clutch member 48 is disposed at a shallow position in the second clutch groove 47, the driven gear 5 and the clutch disk 39 are coupled by the clutch member 48.

FIG. 16 shows the state of the brake control device and clutch device when the electric chain block is hoisted down, and the brake release cam member 12 in the brake control device is disposed at a shallow position in the cam groove 11. Since the presser plate 7 is moved in the direction away from the cam holding member 6, the brake device is relaxed, and the clutch member 48 is housed deep in the second clutch groove 47, so the driven gear 5 and the clutch disc 39 are not coupled.

In the case of the second embodiment, since more friction plates are provided than in the first embodiment, a large transmitted torque can be obtained with a small force of the presser plate pressing spring member 15.

[0017]

According to the present invention, the support ring and support member provided between the intermediate drive gear and the brake receiver in the conventional electric chain hoist are omitted, and the brake that supports the brake pawl 10 is provided. The receiving plate 8 is connected to the rotating shaft 4.
Since it engages with the side surface of the large diameter shaft portion 14 provided on the side of the load sheave 3, the number of parts constituting the electric chain hoist can be reduced, and the electric chain hoist can be assembled easily and quickly. Moreover, the manufacturing cost of the electric chain hoist can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional plan view showing a part of an electric chain hoist according to a first embodiment of the present invention.

FIG. 2 is a partially longitudinal side view of the electric chain hoist.

FIG. 3 is an enlarged longitudinal cross-sectional side view of a gear transmission mechanism having a torque limiter in the electric chain hoist.

FIG. 4 is a front view showing a cam holding member and a sphere provided inside a driven gear in the electric chain block.

FIG. 5 is a sectional view taken along line CC in FIG. 4;

FIG. 6 is a longitudinal side view showing the state of the torque limiter during lowering operation of the electric chain hoist.

FIG. 7 is a cross-sectional plan view showing a part of an electric chain hoist according to a second embodiment of the present invention.

FIG. 8 is a partially longitudinal side view of the electric chain hoist.

FIG. 9 is an enlarged vertical sectional side view of an intermediate gear transmission mechanism having a torque limiter in the electric chain block.

FIG. 10 is a front view showing a cam holding member and a sphere provided inside a driven gear in the electric chain block.

11 is a sectional view taken along line DD in FIG. 10. FIG.

FIG. 12 is a sectional view taken along line E-E in FIG. 10;

13 is a sectional view taken along line FF in FIG. 9. FIG.

14 is a sectional view taken along line GG in FIG. 13. FIG.

FIG. 15 is a longitudinal sectional side view showing the states of a brake control device and a clutch device during hoisting operation of the electric chain hoist.

FIG. 16 is a longitudinal sectional side view showing the states of a brake control device and a clutch device during lowering operation of the electric chain hoist.

[Explanation of symbols]

1 Electric motor 2 Drive shaft 3 Load sheave 4 Rotation axis 5 Driven gear 6 Cam holding member 7 Presser plate 8 Brake receiver 9 Brake claw piece 10 Brake ratchet wheel 11 Cam groove 12 Brake release cam member 13 Adjustment nut 14 Large diameter shaft part 15 Spring member for pressing the presser plate 16 Drive gear 17 Intermediate shaft 18 Intermediate driven gear 19 Intermediate drive gear 20 Bearing ring 21 Pressure ring 22 Cylindrical bearing 23 Thrust bearing 24 Friction plate 25 Friction plate 26 Friction plate 27 Annular groove 28 Support shaft 29 Frame 32 Spacer 37 Intermediate flange 38 Support ring 39 Clutch board 41 Interlocking rotation pin 42 Friction plate 43 Friction plate 44 Slanted bottom surface 45 First clutch groove 46 Slanted bottom surface 47 Second clutch groove 48 Clutch member

Claims (1)

[Claims] 1. A gear reduction mechanism equipped with a torque limiter and a mechanical brake is interposed between a drive shaft 2 rotated by an electric motor 1 and a rotary shaft 4 provided with a load sheave 3. A cam holding member 6 provided inside the driven gear 5 in the gear reduction mechanism is fitted, and a holding plate 7 and a brake receiving plate 8 are arranged on one side and the other side of the cam holding member 6. A brake pawl wheel 10 is fitted in a slidable but non-rotatable manner and engages with the brake pawl piece 9, and is interposed between the driven gear 5 and the brake receiver 8, and is attached to the cam holding member 6. A cam groove 11 whose depth changes along the circumferential direction of the rotating shaft is provided on the side,
In the electric chain block, a brake release cam member 12 is fitted into the cam groove 11, and an adjustment nut 13 for adjusting the pressing force of the presser plate 7 is screwed onto the rotating shaft 4. , a presser plate pressing spring member 15 is engaged with a side surface of a large diameter shaft portion 14 provided on the load sheave 3 side of the rotating shaft 4, and is pressed against the outer surface of the presser plate 7 by the adjustment nut 13. Electric chain hoist in place.