JPS5810359B2 - Automatic anti-reverse braking device for winch winding drum - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic anti-reverse braking device for a winch drum that utilizes the rear axle of an automobile as an output shaft.

In a winch that is connected to the rear axle of an automobile, it is possible to use the forward rotational output of the axle at speeds 1 to 4.
Needless to say, this type of winch is desirable for hoisting work because the speed can be freely selected, but it must be used by connecting it to the left or right side of the rear axle depending on the situation at the work site. Therefore, the direction of rotation of the winding drum is opposite on the left and right sides of the axle, and in both cases, in order to be able to utilize the forward rotational output of the rear axle, it is necessary to There is a need for an automatic reversal prevention braking device that can operate effectively even when

The object of the present invention is to provide an automatic reversal prevention braking device for a saw type winch winding drum that can satisfy the above-mentioned needs.The construction thereof will be described in detail with reference to the illustrated embodiment.

In the figure, 1 is the rear axle of a car, and 2 is a rear wheel bubble. Like conventional devices, the tooth rows 3 and 4 normally formed on the rear axle 1 and the bubble 2 are connected to a cap-shaped coupling ( (not shown), the rotation of the rear axle 1 is directly transmitted to the hub 2.

Reference numeral 5 denotes a sun gear shaft of a winch planetary gear reduction mechanism connected to the rear axle 1 by fitting the inner side groove 6 of the base into the groove 3 of the rear axle 1 from which the coupling has been removed; 7, it is fastened and fixed to the rear axle 1 so as to be able to rotate integrally therewith.

8 is the flesh strip 4 of the bub 2 from which the coupling has been removed.
The inner toothed shaft of the planetary gear reduction mechanism is connected and fixed to the inner circumferential wall 9 on one side by fitting into it, and is connected and fixed to the pin 2, 10 is the sun gear of the sun gear shaft 5, and 11 is rotated to the sun gear shaft 5. The υ winding drum 11 is attached to the rear axle 1 by meshing the sun gear 10 and the internally toothed shaft 8 with the planetary gear 12 which is freely fitted into the winch winding drum and is rotatably supported on the winch winding drum. On the other hand, it rotates at a reduced speed at a predetermined rotation ratio.

Next, 15 is a left-handed male helix carved on the outer periphery of the tip side of the sun gear shaft 5 protruding from the winding drum 11, and 16 is the male helix 1.
A right-handed male spiral with a larger lead than the male spiral is carved on the inner periphery of a cylindrical portion 13 that protrudes from the winding drum 11 and surrounds the winding drum 11 concentrically, and this male spiral 16 and the male For example, when the reduction rotation ratio between the sun gear shaft and the winding drum is 4=1, the ratio of the lead size to the spiral 15 is approximately 4=1, which is almost inversely proportional to this.
The lead of the male spiral 16 is set to be large with a ratio of 1.

17 and 18 are the male helix 15 and the male helix 16, respectively.
A pair of left and right brake disks are screwed together so that they can move forward and backward, and are opposed to each other, and a spiral spring is provided on the back side of the opposing surfaces to which a rotational recovery source force is applied so as to cause the brake disks to spiral in opposite directions. 19.20 is installed, and the rotation recovery source force presses the brake discs 17 and 18 together, and the helical springs 19 and 20 press the brake discs 17 and 18 together.
The braking resistance generated between 8 and 8 is set at an appropriate level commensurate with the output of the hoisting load, so that the driving rotation of the sun gear side ground spiral by the rear axle 1 forces the two brake discs to separate against the braking resistance. The helical spring 19° 20 has one end 19a, 20a set as a braking circle, respectively.

The other end 19b is hooked to the plates 17 and 18.

20b are the sun gear shaft 5 and the cylindrical portion 1 of the winding drum 11, respectively.
3, the spiral 15 or 16 controls the torsional displacement of the brake discs that occurs when the brake discs 17 and 18 are moved forward and backward in the coupled state, until the brake discs separate from each other. , to restore it to its old state.21
22 is the contact point of the brake disc 17 which is detachably attached to the sun gear shaft 5 at a small distance from the right end of the brake disc 11 in FIG.
is also located at a small distance from the left end of the brake disc 18.

The brake disc 18 is located on the end wall of the body 11.

Now, as shown in FIG. 1, when the winch is connected to the right side of the rear axle 1 of the automobile and the hoisting operation is performed by forward rotation of the rear axle (rotation to the left when viewed from the vehicle body side).

Sun gear shaft 5 and its sun gear 10 to planet gear 12
The winding drum 11, which is decelerated and rotated through , both rotates to the left.
Due to the counterclockwise rotation of the male helix 15 (left-hand thread) of the sun gear shaft 5, the brake disc 17 is rotated counterclockwise against the helical spring 19 due to the threaded resistance of the threaded portion, and press-fitted thereto. The brake disk 18 rotates counterclockwise due to the rotational recovery force of the spiral spring 20 and spirals leftward along the male spiral 16 to follow the brake disk 17. In this case, the lead of the male spiral 16 is the same as the lead of the male spiral 15. Because it is larger, the brake disc 18 spirals to the left at the same time without delaying the brake disc 17,
This immediately hits the hit 22 and is prevented from moving to the left, but the brake disc 17 still tries to move to the left, so the braking resistance between the brake discs 17 and 18 is weakened, and both brake discs 4 The winch winding drum 11 rotates along with the sun gear shaft 5 and the winding drum 11, respectively, while resisting slight frictional resistance between them. Therefore, the winch winding drum 11 is hoisted by decelerating rotation (clockwise rotation) due to the forward rotation of the rear axle 1 of the vehicle. You can get them to do the work.

In this case, due to the leftward tendency of the brake disk 17 due to the male spiral 15 (left-hand screw, left rotation) and the rightward movement tendency of the brake disk 18 due to the male spiral 16 (right-hand screw, left rotation), both disks 17
．． When the helical springs 18 try to separate from each other, the helical springs 19 and 20 try to restore them to their old state by their rotational recovery force, so that the brake discs 17 and 18i rotate while repeating the action of separating from and attaching to each other.

In this way, when the hoisting work is completed and the rear axle of the automobile stops rotating 10 times, even if the hoisting load becomes a reverse load and acts on the winding drum 11, the reverse (clockwise rotation) is caused by the spiral springs 19, 20.
The winding drum cannot reverse rotation because it is sufficiently prevented by the frictional braking resistance between the braking disks 17 and 18 that are brought into pressure contact with each other and the reversal resistance of the speed reduction mechanism by the planetary gear 12. Spiral firing of a disc 19.2
Even if a strong reversal load is applied that causes the reversal to occur against the braking resistance due to zero and the reversal resistance of the deceleration mechanism, the reverse rotation (clockwise rotation) force of the winding drum 11 will cause the braking disc 18 to rotate against the winding drum side male helix 16. (right-handed screw, right-handed rotation), the sun gear shaft side female male spiral 15 (left-handed screw, right-handed rotation), which rotates at a rotation ratio of 1:4 with respect to this male spiral 16, is opposed to the braking disk 17. As a result, the braking resistance increases in proportion to the magnitude of the applied reverse load, causing the winding drum 11 to reverse direction and further unloading from the hoisting stopped state. In this case, when the sun gear shaft 5 is rotated clockwise, the brake disc 17 is rotated clockwise due to the frictional resistance caused by the clockwise rotation of the male helix 15 and the rotation recovery source force of the helical spring 19, and rotates to the right along the male helix 15. The brake disc 18, which makes a noise when the brake disc 18 is pressed into contact with the spiral spring, also moves clockwise along the male spiral 16 while rotating clockwise against the spiral spring 20, but the brake disc 1
7 immediately collides with 21 and is prevented from moving to the right, so the braking discs 17 and 18 rotate while repeating the detachment action due to the rotational recovery source force of the spiral springs 19 and 20 of both, and the braking resistance is weakened. Unloading work using the winding drum 11 becomes possible. In this case, since the lead of the male spiral 16 is larger than the lead of the male spiral 15, the brake disc 18 can spiral to the right in advance of the brake disc 17. Therefore, if both brake discs cannot be separated while still being joined together, then by clockwise rotation of the male spiral 15 and male spiral 16, the brake discs 17 and 18 can be screwed together oppositely to each other and rotate the winding drum 11. Can not.

Next, when a winch is connected to the left side of the rear axle 1 of the car and hoisting work is performed by forward rotation of the rear axle, the rear axle 1 will rotate clockwise as seen from the car body side in Figure 1. , in the same figure, the sun gear shaft 5 and the winding drum 11 rotate clockwise.Therefore, by clockwise rotation of the sun gear shaft side male spiral 15 (left screw), braking is performed as explained in the case of counterclockwise rotation of the rear axle 1. Since the disc 17 rotates clockwise while moving to the right, and rotates the brake disc 18 that is integrated with it clockwise, this brake disc 18 also rotates along the male spiral 16 (right-handed screw, counterclockwise rotation) at the same time as the brake disc 17. At this time, the brake disc 1 is spiraling to the right.
7 collides with the collision 21 and is prevented from moving to the right, but the brake disc 18 still tries to move to the right, so the frictional resistance between both brake discs is small, and the forward rotation of the rear axle 1 of the vehicle causes The winch winding drum 11 can be hoisted.

Also, when the rotation of the rear axle 1 is stopped, the reversal load that acts on the winding drum 11 is affected by the braking resistance between the brake discs 17 and 18 and the planetary gear 12, as in the case of counterclockwise rotation of the rear axle 1. The reverse rotation resistance of the deceleration mechanism and the reverse rotation resistance of the winding drum are ensured. However, in this case,
The reversal load acting on the rear axle 1 differs from the above-mentioned case of counterclockwise rotation of the rear axle 1, and the reverse load acting on the left side of the male helix 16 (right-hand screw) that rotates the winding drum 11 counterclockwise against the braking resistance between the brake discs 17 and 18. The rotation causes the brake disc 18 to move to the right, and at the same time, the rear axle 1
is rotated counterclockwise against the reversal resistance of the speed reducer by the planetary gear 12, and the brake disk 17 is moved to the left in the direction of separating from the brake disk 18 by counterclockwise rotation of the male spiral 15 (left-hand screw) of the sun gear shaft 5. Therefore, if the reversal load exceeds the braking resistance of the braking disk and the reversing resistance of the planetary gear reduction mechanism, it is impossible to prevent the reversal of the winding drum 11. If necessary, remove the cover 14 of the cylindrical portion 13 of the winding drum 11 and insert the brake disc 17.1B removed from the spiral 15.16 into the second
As shown in FIG. 17 to the left side and attach it to the sun gear shaft, as well as cover plate 14.
By using the inner surface 22a of the brake disc 18 as a contact, it is also possible to perform the same braking action as when a winch is connected to the right side of the rear axle 1 of the automobile.

As described above, the present invention provides a winch that is connected to the rear axle of an automobile to cause the winding drum to rotate at a reduced speed through a differential gear train, in which the outer periphery of the sun gear shaft and the inner periphery of the winding drum that surrounds it. A male spiral and a male helix with opposing screw directions are carved into the disc, and one of a pair of braking discs is pressed against the male helix, and the back thereof is connected to the sun gear shaft by a helical thread. , and the other brake disc is screwed onto the male spiral and the rear thereof is connected to the winding drum by a spiral spring, respectively,
A rotational recovery source force is applied to each of the helical springs in a direction that causes the brake discs to spiral in opposite directions, so that both brake discs are pressed against each other, and the lead of the male spiral on the winding drum side is connected to the sun gear. The lead of the male helix on the shaft side is set to be larger than the lead of the male helix on the shaft side, and the drive rotational force from the sun gear shaft or the winding drum side causes the brake discs to simultaneously move in the same direction while remaining coupled through the male helix or the male helix. and a stop is installed in front of the brake disc located on the rear side in the direction of movement to stop the movement of this brake disc before the front brake disc.
Even when winding work is performed by rotating the winding drum in either the left or right direction, the reversal of the winding drum can be automatically prevented by the frictional braking resistance between the braking discs and the reverse rotation resistance of the reduction mechanism by the gear train. However, in this type of winch that needs to be connected to the left or right side of the rear axle of a car to perform hoisting work, the direction of rotation is reversed on the left and right sides of the axle, so conventional winches are either To use the forward rotation output of the rear axle for one rotation and the reverse rotation output for the other, or to use only the forward rotation output of the rear axle, there are two types: one for left rotation and one for right rotation. However, according to the present invention, for either left or right rotation of the winch, only the forward rotation output of the rear axle is used to arbitrarily select rotation speeds 1 to 4. It is possible to carry out hoisting work stably and economically while

[Brief explanation of the drawing]

The attached drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal sectional side view of the state connected to the rear axle of an automobile, and FIG. 2 is a longitudinal sectional side view of the main parts. 1. Automobile rear axle , 5... sun gear shaft, 10...
・Sun gear, 11... Winding barrel; 12... Planetary gear, 8
... Internal tooth shaft, 15... Male spiral, '16... Male spiral, 17.18... Braking disk, 19,21O... Spiral firing.

Claims (1)

[Claims] 1. In a winch that is connected to the rear axle of an automobile and is configured to rotate at a reduced speed through a differential gear train, in a winch that is configured to rotate on both sun shafts, the outer periphery of the sun gear shaft and the winding that surrounds it. A male spiral and a male spiral with opposite screw directions are carved on the inner periphery of the body side, one of a pair of brake discs is pressed against the other, and one of the brake disks is screwed onto the male spiral, and the rear side is screwed into the male spiral. The other brake disc is screwed onto the sun gear shaft by a spring, and the other brake disc is connected to the male spiral, and the rear thereof is connected to the winding drum by a spiral spring, and each of the brake discs is spirally driven oppositely to the spiral spring. Applying a rotation recovery source force in the direction, the two braking disks are brought into contact with each other by opposing pressure, and the lead of the male spiral on the winding drum side is thicker than the lead of the male spiral on the sun gear shaft side (by setting, The driving rotational force from the gear shaft or the winding drum side causes the brake disks to move forward and backward in the same direction at the same time through the male spiral or the male spiral while remaining in a coupled state, and also to move the brake disks forward and backward in the same direction at the same time. This automatic reversal prevention braking device for a winch winding drum is characterized in that a hit is installed in front of a braking disc located in front of the braking disc to stop the movement of this braking disc before the front braking disc.