JP2570797Y2 - Hoist brake equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake device for a hoist capable of preventing generation of noise and the like.

[0002]

2. Description of the Related Art Conventionally, a hoist has, for example,
No. 4,475,955. This brake device includes a brake gear provided in a rotation transmission path from an input shaft to an output shaft of a hoist and rotatable in both a lifting load lowering direction and a lifting load rising direction; A brake ratchet for contacting the side surface of the brake gear to apply a brake when rotating in the descending direction, and meshing with the teeth of the brake ratchet when the input shaft rotates in the hanging load descending direction; A pawl for stopping the ratchet and generating a braking force.

[0003] When a hoist is lifted by such a hoist, the brake gear rotates in one direction as the input shaft rotates in the hoisting load raising direction. In this case, since the pawl does not bite into the brake ratchet, the brake pawl rotates with the brake gear. Therefore, no braking force is generated.

When the suspended load is lowered, the brake gear rotates in the opposite direction as the input shaft rotates in the suspended load lowering direction. In this case, the nail bites into the brake ratchet and the brake ratchet stops. Therefore, a braking force is applied to the brake gear, and rapid rotation of the output shaft is prevented.

[0005]

However, in the conventional brake device described above, when hoisting the suspended load, the claws for braking hit the claws while rotating along with the gears for braking, so that noise is generated. Wear of the contact portion of the motor increases.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by changing the input shaft (3) of the hoist to the output shaft.
A brake gear (13) provided in the rotation transmission path leading to (6) and rotatable in both the lifting load lowering direction (D) and the lifting load lifting direction (U) , and the input shaft (3) are provided. The above-mentioned brake gear (13) when rotating in the suspended load lowering direction (D )
Brake hook (1)
9), the brake ratchet wheel (19) teeth and meshes with the ratchet wheel for the brake (19) is stopped when said input shaft (3) rotates in the suspended load lowering direction (D), the brake force A brake device for a hoist provided with a claw (20) to be raised, wherein the brake gear (13) and the brake claw are provided.
Is loosely fitted to the mounting axis (9) of the brake ratchet wheel (19) is held in the gap between the vehicle (19), the ring body mounting shaft (9) can be rotated together by a frictional force (28) are mounted on the ring member (28), while restricting the amount of rotation of the ring member (28) engages with the pawl (20), the ring member (2
8) is rotated in the suspended load lowering direction (D) when the claw (2 ) is rotated.
0) is engaged with the brake ratchet (19) , and when the brake gear (13) rotates in the lifting load lifting direction (U) , the pawl (20) is moved to the brake ratchet (19).
A configuration is provided in which an engagement portion (29) for separating from the contact portion is provided.

[0007]

When the hoist is lifted by the hoist, the input shaft of the hoist rotates in the direction of lifting the hoist, and the brake gear also rotates in that direction, transmitting torque to the output shaft. The output shaft lifts the suspended load via a rope, a chain, or the like.

[0008] At this time, the brake ratchet rotates with the brake gear, and does not apply a braking force to the brake gear and thus the output shaft. Also, for the mounting shaft of the ratchet wheel for brake
The loosely fitted ring rotates together with the mounting shaft due to frictional force . When the engagement portion engages with the claw, the ring rotates the claw away from the ratchet while rotating together by a certain amount. For this reason, the ratchet wheel rotates without contact with the pawl, and generation of noise and the like is prevented.

When the load is lowered by the hoist, the input shaft rotates in the direction in which the load is lowered, and the brake gear also rotates in that direction, transmitting torque to the output shaft. The output shaft lowers the suspended load via a rope, a chain, or the like.

At this time, the ring is pressed against the side surface of the brake gear, and rotates together with the brake gear due to the frictional force between the two. The ring body makes the pawl bite into the teeth of the ratchet while rotating together with the pawl by a certain amount by engaging the engaging portion with the pawl. For this reason, the brake ratchet stops, and a braking force is applied to the brake gear and eventually to the output shaft.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of a brake device for a hoist according to the present invention will be described below.

This hoist, as shown in FIG.
It is a small electric winch, the housing 1 of which is a left part 1
a, an intermediate portion 1b, and a right portion 1c. Above the middle part 1b of the housing 1, a motor 2
Are fixed horizontally, the motor shaft of which extends left and right as the input shaft 3, the left part of which enters the housing left part 1 a, and a predetermined portion is supported by the bearing 4.

Below the intermediate portion 1b of the housing 1,
A drum 5 around which a rope or the like is wound is stored, and an output shaft 6 which is a support shaft fixed to the drum 5 is connected to the input shaft 3.
And into the housing left portion 1a in parallel with the housing, and is supported by bearings 7a and 7b on its end wall and the partition wall of the intermediate portion 1b, respectively.

The end wall of the housing left portion 1a and the intermediate portion 1
A gearbox is provided between the drive shaft and the partition b, and as shown in FIGS. 1 to 5, a reduction gear train which is a rotation transmission path from the input shaft 3 to the output shaft 6 is provided. Is stored.

This gear train comprises a first and a second intermediate shaft 8, disposed between the input shaft 3 and the output shaft 6 in parallel with each other.
9, the first small gear 1 provided on the input shaft 3.
0, a first large gear 11 attached to a first intermediate shaft 8 meshing with the first small gear 10, a second small gear 12 fixed to the first intermediate shaft 8, A second large gear 13 attached to a second intermediate shaft 9 that meshes with the second small gear 12, and a third small gear 14 fixed to the second intermediate shaft 9.
And a third large gear 15 fixed to the output shaft 6 meshing with the third small gear 14. Similarly to the input shaft 3 and the output shaft 6, the first and second intermediate shafts 8, 9 are supported by bearings 16a, 16b, 17a, 17b on the end wall of the housing left portion 1a and the partition wall of the intermediate portion 1b, respectively. I have.

When the motor 2 is started, the input shaft 3
Rotates at high speed, the first small gear 10, the first large gear 11, the first intermediate shaft 8, the second small gear 12, the second large gear 13, the second intermediate shaft 9, The output shaft 6 rotates at a low speed through the small gear 14 and the third large gear 15, and the drum 5 rotates together with the output shaft 6. The motor 2 can switch between normal rotation and reverse rotation, so that the drum 5 rotates in the suspended load lowering direction or in the suspended load rising direction.

The first large gear 11 is loosely fitted on the first intermediate shaft 8, and is connected to the first intermediate shaft 8 via a clutch plate 18. Thereby, overload is avoided. The periphery of the second intermediate shaft 9 is a brake device for the hoist.

That is, as shown in FIGS. 1 and 2, the second large gear 13 is a brake gear rotatable in both the lifting direction D and the lifting direction U. a brake ratchet wheel 19 to brake in contact with the side surface of the gear for the brake when the said input shaft 3 which rotates in the suspended load lowering direction D, the input shaft 3 is also rotated in the suspended load lowering direction D Occasionally, it engages with the teeth 19a of the brake pawl 19 to stop the brake pawl 19,
A claw 20 for generating a braking force is combined.

Brake gear 1 as a second large gear3
Is screwed with a screw 21 provided on the second intermediate shaft 9.
You. In addition, the second large gear 13 has a ratchet wheel 1 for a brake.
Two pins 22 are implanted on the side opposite to 9 and a second intermediate
A screw stopper 2 capable of engaging with both pins 22 is provided on the shaft 9.
3 is fixed. The screw stopper 23 is shown in FIG.
As shown in the figure, the second large gear 13 is
When disengaged from the pin 22 when rotating,
The second gear 13 rotates in the lifting direction U.
At the same time as the pin 22.

The brake ratchet wheel 19 is a movable disk as a brake device, and as shown in FIG.
Brake linings 24 are fixed to both side surfaces thereof. This movable disk is a pair of fixed disk 2
The fixed disk 25 is fixed to the second intermediate shaft 9 so as to sandwich the movable disk together with the second large gear 13 so as to sandwich the movable disk.

When the second large gear 13 rotates in the suspended load lowering direction D, the pin 22 is released from the screw stopper 23, so that the pin 22 is released relative to the second intermediate shaft 9. It rotates, and along with the screw 21, the brake hook 19
Screw toward. As a result, the ratchet wheel 19 is held between the fixed disk 25 and the second large gear 13. Conversely, when the second large gear 13 rotates in the lifting load lifting direction U, the pin 22 engages with the screw stopper 23, so that the pin 22 rotates integrally with the second intermediate shaft 9 and the brake pawl Do not screw towards car 19. As a result, the brake pawl 1
9 rotates together with the second large gear 13 without generating a braking force.

As shown in FIGS. 1 and 2, the pawl 20 is formed so as to engage with the teeth 19a of the brake pawl 19 when the brake pawl 19 is about to rotate in the suspended load lowering direction D. Is rotatably supported via a bolt shaft 26. Also, the teeth 19 of the ratchet wheel 19
The claw 20 is urged by the compression coil spring 27 from the housing 1 side to the brake claw wheel 19 so that the engagement with the a is ensured. This compression coil spring 27 can be omitted if the engagement with the brake ratchet wheel 19 is ensured by the ring body 28 described later.

Thus, the rotation of the brake ratchet wheel 19 is prevented by the pawls 20 when the suspended load is lowered, so that the braking force to be applied to the output shaft 6 is reliably generated. The second
FIG. 6 shows that between the brake gear, which is the large gear 13, and the ratchet wheel 19, the brake gear 19 is pressed against the side surface of the brake gear and can rotate together with the brake gear due to the frictional force therebetween. An annular body 28 is provided.

When the ring 28 rotates in the suspended load lowering direction D while engaging with the pawl 20 to regulate the amount of rotation of the ring 28, the pawl 20 An engagement portion 29 is provided which meshes with the ratchet wheel 19 and separates the pawl 20 from the brake ratchet wheel 19 when the brake gear rotates in the lifting load lifting direction U.

The engaging portion 29 is formed by forming a long hole 29b in a convex piece 29a projecting outward from the ring body 28. On the other hand, a pin 30 is implanted at the tip of the claw 20, and the pin 30 is inserted into the elongated hole 29b.
The engaging portion 29 is formed by press-forming a steel plate to form the ring body 2.
8 and are integrally formed.

As a result, when the brake gear composed of the second large gear 13 rotates in the suspended load drop direction D, as shown by the solid line in FIG. And the engaging portion 29
Rotates the pawl 20 in the clockwise direction F to release the pawl 19 for braking.
And the rotation of the ratchet wheel 19 is prevented. In addition, the second gear 13 moves in the lifting direction U
As shown by the chain line in FIG. 5, while the ring body 28 pressed against the brake gear rotates together with the frictional force, the engagement portion 29 rotates the claw 20 in the counterclockwise direction E. Move it away from the teeth 19a of the ratchet wheel 19,
The contact of the brake ratchet wheel 19 with the teeth 19a is prevented.

The ring 28 and the engaging portion 29 may have a structure as shown in FIG. In this case, the ring body 28 is formed by winding a wire made of spring steel in a loop, and the convex pieces 29a of the engaging portions 29 are formed by projecting both ends of the wire parallel to the outside of the wheel. The slot corresponding to the elongated hole is formed as a slit 29b between both ends of the wire.

Next, the operation of the brake device of the hoist will be described. When the load is raised by the hoist, the input shaft 3 of the hoist is rotated by the drive of the motor 2 in the lifting direction. This rotational force is transmitted to the output shaft 6 via a brake gear or the like. The output shaft 6 rotates the drum 5,
The drum 5 winds a rope, a chain, etc. (not shown) to lift the suspended load.

At this time, the brake ratchet wheel 19 rotates integrally with the brake gear, which is the third large gear 13, so that the brake device does not generate a braking force. The ring 28 is
It is pressed against the side surface of the brake gear, and rotates together with the brake gear due to the frictional force between the two. Since the engaging portion 29 is engaged with the pawl 20 via the pin 30, the ring body 28 moves the pawl 20 away from the ratchet wheel 19 while rotating together by a certain amount. For this reason, the brake pawl 1
9 rotates in a non-contact manner with the claw 20, thereby preventing generation of noise and the like.

When the load is lowered by the hoist, the motor 2 rotates in the reverse direction, the input shaft 3 rotates in the direction in which the load is lowered, the brake gear also rotates in the direction, and the torque is transmitted to the output shaft 6. I do. By the rotation of the output shaft 6, the drum 5 draws out a rope, a chain, etc., and lowers the suspended load.

At this time, the ring body 28 is pressed against the side surface of the brake gear, and rotates together with the brake gear due to the frictional force therebetween. The ring body 28 has its engaging portion 29
Since it is engaged with the 0 pin 30, the claw 20 bites into the teeth 19a of the brake ratchet 19 while rotating together by a certain amount. For this reason, the braking ratchet 19 stops, and a braking force is applied to the braking gear and, consequently, the output shaft 6. The movement of the claw 20 is ensured by the urging force of the compression coil spring 27.

[0032]

According to the present invention, the pawl can be separated from the brake ratchet when the brake gear rotates in the lifting direction of the suspended load. Therefore, it is possible to completely prevent the noise generated when the suspended load is raised, and to operate the hoist silently. Further, abrasion of the brake ratchet wheel and the pawl can be prevented. Also operate the nails
Between the brake gear and the ratchet wheel
Of the brake pawl wheel and
Fitted so that it can rotate together with the mounting shaft by frictional force
, The ring is sandwiched between the brake gear and the brake ratchet
It can be assembled with only simple operation and has spring property
It can be manufactured at a low price without the need to provide.

[Brief description of the drawings]

FIG. 1 is a front view of a hoist provided with a brake device according to the present invention with a part of a housing removed, showing a state where a suspended load is lowered.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a longitudinal sectional view of the hoist.

FIG. 4 is a view similar to FIG. 1 when a suspended load is raised.

FIG. 5 is a view similar to FIG. 1 showing both a rising load and a falling load.

FIG. 6 is a plan view of an example of a ring body incorporated in the brake device.

FIG. 7 is a plan view of another example of the ring body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 3 ... Input shaft 6 ... Output shaft 13 ... 2nd big gear 19 ... Brake ratchet wheel 19a ... Brake ratchet wheel tooth 20 ... Claw 28 ... Ring body 29 ... Engaging part D ... Lifting load lowering direction U ... Hanging Lifting direction

Continuation of the front page (56) References Japanese Utility Model Showa 56-87637 (JP, U) Japanese Utility Model Showa 63-154594 (JP, U) Japanese Utility Model Showa 49-102458 (JP, U) Japanese Utility Model Showa 60-110390 (JP, U.S.A.) , U) Japanese Utility Model Showa 63-18493 (JP, U) Japanese Utility Model Showa 32-7148 (JP, Y1) Japanese Utility Model Showa 45-3213 (JP, Y1) Japanese Utility Model Showa 56-44795 (JP, Y2) (58) Surveyed field (Int.Cl. ⁶ , DB name) B66D 3/14 B66D 3/16 B66D 3/20 B66D 3/22 B66D 5/12 B66D 5/14 B66D 5/32 B66D 5/34

Claims (1)

(57) [Scope of request for utility model registration] 1. A brake gear provided in a rotation transmission path from an input shaft to an output shaft of a hoist, the brake gear being rotatable in both a lifting load lowering direction and a lifting load rising direction, and wherein the input shaft is a lifting gear. A brake ratchet for contacting the side surface of the brake gear to apply a brake when rotating in the descending direction, and meshing with the teeth of the brake ratchet when the input shaft rotates in the hanging load descending direction; In a brake device of a hoist having a pawl for stopping a ratchet and generating a braking force, a brake device is provided between the brake gear and the brake ratchet.
And a ring that is loosely fitted to the mounting shaft of the brake ratchet wheel and that can rotate together with the mounting shaft by frictional force is provided in the gap. When the ring rotates in the suspended load lowering direction, the pawl meshes with the brake ratchet wheel while regulating the rotation amount of the ring, and the brake gear rotates in the suspended load rising direction when the brake gear rotates in the suspended load rising direction. A brake device for a hoist, comprising an engaging portion for moving a pawl away from the brake pawl.