JP2018076163A - Winch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winch device with a simple structure that can recover from a slip motion.SOLUTION: A winch device includes a motor 2d, a gear 7, a gear holding portion 19, a wire drum drive shaft 8, and a wire drum 3. The gear holding portion 19 includes a pair of cams 13d and 25d having inclined surfaces that are fitted to each other. The winch device is also provided with pawls 33a and 33b and a spring pin 34 that release the fixed state by rotating the gear 7 in the unloading direction when the cams 13d and 25d are excessively twisted in the forward direction relatively and fixed due to rapid increase in load.SELECTED DRAWING: Figure 8

Description

The present invention relates to a winch device.

  Conventionally, winch devices have been used for unloading and unloading construction materials at construction sites.

  The winch device includes a driving motor, a wire drum for winding or feeding a wire tied to a load, and a power transmission mechanism between the motor and the wire drum. The drive shaft of the motor is engaged with a power transmission gear, and the rotation of the gear is transmitted to the wire drum via the wire drum drive shaft.

  In such a winch device, various measures are taken so that it can be safely used for various load conditions during unloading and unloading.

  When unloading, the ratchet mechanism must be operated to prevent the gear from rotating backward in the unlikely event that the rotation of the motor is transferred to the gear and wire drum to lift the load. When unloading, the rotation of the motor (reverse rotation) must be transmitted to the wire drum in a situation where the ratchet mechanism does not allow reverse rotation of the gear.

  Therefore, it is possible to expand and contract the part that holds the gear.In the extended state, the gear is rotated according to the one-way rotation of the ratchet function, and in the contracted state, the gear rotates even in a situation where the ratchet mechanism itself allows only one-way rotation. The structure is forgiving.

  As an example of a means that enables expansion and contraction of a portion that holds a gear (referred to as a “gear holding portion”), there is a pair of cams whose inclined surfaces fit each other. According to such a cam, the sloping surface of the cam slides and the distance between the cams extends when unloading, and as a result, the member that contacts the ratchet of the gear holding portion is pressed against the ratchet plate of the ratchet mechanism, and the friction force The ratchet plate rotates together with the gear, and one-way rotation of the ratchet mechanism can be achieved. On the other hand, at the time of unloading, the inclined surfaces of the cams slide in the direction in which they are fitted together, and the distance between the cams is reduced. As a result, the member that contacts the ratchet of the gear holding portion is pressed against the ratchet plate. Becomes weaker and can be rotated while sliding on the ratchet plate so that it can be unloaded.

JP 11-35289 A Japanese Patent Laid-Open No. 11-43291 Japanese Patent Laid-Open No. 5-43194 JP 2009-107833 A

  In the conventional winch device, a means for protecting the motor is taken when a load exceeding a specified load is applied during unloading.

  The case where a load exceeding a specified load is applied during such unloading may be that the load hits the pulley when the load is pulled up to the top. In such a case, even though the wire drum cannot rotate, a current flows through the motor, and a load is applied to the motor, which may cause a malfunction such as motor seizure.

  Therefore, the conventional winch device is configured such that when a load exceeding a certain level is applied, the pad member and the gear that sandwich the gear slip, and only the gear rotates idly.

  However, when a load exceeding a specified load is applied more than expected, a problem may occur in the conventional winch device.

  That is, when a load exceeding a specified load is applied more than expected, the gap between the pair of cams of the gear holding portion is further expanded, and the member that contacts the ratchet plate of the gear holding portion is firmly pressed against the ratchet plate and fixed. (Gear holding part fixed state), and may not return to the original state.

  In the fixed state, the gear continues to idle in the unloading direction, and the motor seizure prevention function is maintained. Normally, when the motor is rotated in the reverse direction, the inclined surface of the cam slides to return to the state where the cam is fitted again, thereby returning to the operable state. However, if it is in a strongly fixed state, even if the motor is rotated in the reverse direction, the gear will only idle (slip) and may not return.

  Accordingly, an object of the present invention is to provide a winch device that solves the above-described problems of the prior art and enables a return from a gear slip operation with a simple configuration.

The winch device according to the present invention is, for example,
A motor, a gear driven by the motor, a gear holding portion including a gear holding means for holding the gear via an elastic mechanism, a ratchet mechanism connectable to the gear holding portion, and the gear holding portion. A wire drum drive shaft driven by the gear, and a wire drum driven by the wire drum drive shaft,
The gear holding portion includes a pair of cams having fitted inclined surfaces, and when the gear rotates in the unloading direction, the cam is twisted in a relatively positive direction to extend the gear holding portion, thereby the ratchet mechanism. In the winch device that transmits the rotation of the motor to the wire drum while operating the ratchet mechanism,
The gear rotates in the unloading direction when the cam is excessively twisted in a relatively positive direction due to a sudden increase in load and the member of the gear holding portion is fixed to a part of the ratchet mechanism. And releasing means for releasing the fixed state by twisting the cam in a direction opposite to the positive twisting direction.

The winch device according to the present invention is, for example,
The member of the holding portion includes a brake disk provided with one cam of the pair of cams and a ring provided with another cam of the pair of cams,
The ring is fitted to rotate integrally with the wire drum drive shaft;
The brake disc and the ring are arranged so as to face each other so that the inclined surfaces of the cams fit together,
The release means includes first engagement means that rotates together with the gear, and second engagement means that rotates together with the brake disk,
The first engaging means of the gear engages with the second engaging means of the brake disc when the gear rotates in the unloading direction, and the brake disc is positive when the brake disc is unloaded from the ring. It can be made to rotate in the direction opposite to the twist direction.

The winch device according to the present invention is, for example,
The first engagement means comprises a spring pin provided so as to protrude from the side surface of the gear,
The second engaging means comprises a claw having an inclined surface provided on a claw plate that rotates integrally with the brake disc,
The claw is configured to allow the spring pin to ride on and pass through the inclined surface when the gear rotates in the unloading direction, and to engage with the spring pin when the gear rotates in the unloading direction. Can be.

  According to the present invention, there is provided a winch device capable of returning from a gear slip operation with a simple configuration.

1 is a perspective view of a winch device according to an embodiment of the present invention. It is a disassembled perspective view of the winch apparatus by one Embodiment of this invention. It is a disassembled perspective view of the power transmission part by one Embodiment of this invention. It is a disassembled perspective view of the periphery of the gear by one Embodiment of this invention. It is a perspective view of the nail | claw plate by one Embodiment of this invention. 1 is a perspective view of a brake disc and a ring according to an embodiment of the present invention. It is explanatory drawing of an effect | action of the brake disc and the cam of a ring. It is explanatory drawing of the means to cancel | release the adhering state of the clamping member by one Embodiment of this invention.

  An embodiment which is an example of carrying out the present invention will be described below.

  FIG. 1 shows a perspective view of a winch device 1 according to an embodiment of the present invention.

  The winch device 1 includes a motor unit 2 serving as a drive source, a wire drum 3 that winds up a wire that lifts or suspends a load, and a power transmission unit 4 that transmits the power of the motor unit 2 to the wire drum 3. .

  The power transmission unit 4 includes a case 4a and a case cover 4b, and the power transmission mechanism is stored therein.

  The winch device 1 has side plates 10a and 10b. These side plates 10a and 10b support the entire device and are used to fix the winch device 1 to a pedestal or the like.

  FIG. 2 shows an exploded perspective view of the winch device 1. FIG. 3 shows an exploded perspective view in which the power transmission portion 4 is enlarged. FIG. 4 is an exploded perspective view showing an enlarged gear periphery of the power transmission unit 4. The configuration of the winch device 1 of the present embodiment will be described below using these drawings.

  As shown in FIG. 2, the motor unit 2 includes a motor cover 2a and a fan case 2b, in which a fan 2c and a motor 2d are stored. The fan 2c is provided for rotating and discharging the heat of the motor 2d.

  The outer shaft 5 is inserted through the core of the wire drum 3, and the drive shaft drive shaft 6 of the motor 2 d passes through the outer shaft 5.

  Reference numeral 20 in FIG. 2 indicates wires (two types having different lengths) wound around the wire drum 3.

  The end of the drive shaft 6 has a drive shaft gear 6a, which is inserted into the case 4a and meshes with the gear 7 of the power transmission unit 4.

  As more clearly shown in FIGS. 2 and 3, the gear 7 includes a gear holding portion 19 (that is, the brake disc 13, the two brake pads 14, the plate 15, the claw plate 33, the disc spring 17a, the washer 17b, and the nut 17c. And the torsion spring 24 and the ring 25), the power can be transmitted to the wire drum drive shaft 8.

  A wire drum drive gear 8a is provided at the end of the wire drum drive shaft 8, and meshes with the wire drum gear 9 as shown in FIG.

  The wire drum gear 9 is fixed to the wire drum 3 by screws and transmits rotation to the wire drum 3.

  From the viewpoint of the power transmission path, the rotation of the motor 2d is transmitted to the gear 7 through the drive shaft 6, and the rotation of the gear 7 is transmitted to the wire drum drive shaft 8 through the gear holding portion 19 to drive the wire drum. The rotation of the shaft 8 is configured to be transmitted to the wire drum 3 via the wire drum gear 9.

  FIG. 4 shows the configuration of the release means for releasing the fixed state of the gear 7, the gear holding portion 19, and the cam.

  The gear holding unit 19 includes a brake disk 13, a pair of brake pads 14, a plate 15, a claw plate 33, a disc spring 17 a, a washer 17 b, a nut 17 c, a torsion spring 24, and a ring 25.

  Among them, the disc spring 17 a, the washer 17 b, and the nut 17 c constitute an elastic mechanism 17.

  The brake pads 14 are arranged on both sides of the gear 7, and as a whole, the brake disc 13, brake pad 14, gear 7, brake pad 14, plate 15, claw plate 33, disc spring 17a, washer 17b, nut from the left side of FIG. 17c, torsion spring 24, and ring 25 are arranged in this order. One end of the torsion spring 24 is hooked into a groove (or a hole) provided near the cam 13d of the brake disc 13 and the other end is inserted into a pin hole provided on the outer periphery of the ring 25. It is hooked on the pin 25b.

  The brake disc 13 and the nut 17c have a male screw formed on the brake disc 13 and a female screw formed inside the nut 17c, and are screwed together. Between the brake disc 13 and the nut 17 c, there are a resilient mechanism 17, a claw plate 33, a plate 15, a brake pad 14 and a gear 7, and the pair of brake pads 14 are pressed against the side surfaces of the gear 7 by the resilient force of the resilient mechanism 17. In normal driving torque (for example, less than 150% of the specified load), the brake pad 14 and the gear 7 rotate integrally without slipping. That is, the gear clamping means 18 is comprised by these structures. For this reason, normally, the brake disc 13, the brake pad 14, the gear 7, the plate 15, the claw plate 33, the disc spring 17a, the washer 17b, and the nut 17c rotate integrally, and the ring 25 is twisted. .

  FIG. 5 shows the claw plate 33 in an enlarged manner.

  As shown in FIG. 5, the claw plate 33 is made of a substantially bowl-shaped metal plate, has a notch at the peripheral edge, and a pair of claws 33 a having a slanted surface as shown in the figure by folding back part of the metal. 33b is formed. A plurality of holes 33 c are formed in the vicinity of the central opening of the claw plate 33 as shown in the figure. As shown in FIG. 4, the hole 33 c is used to fix the claw plate 33 to the adjacent plate 15 by a truss screw 36.

  FIG. 6 shows the brake disc 13 and the ring 25 extracted.

  As shown in FIG. 6, the brake disc 13 has a cam 13d, and the ring 25 has a cam 25d. Each of the cam 13d and the cam 25d has an inclined surface as shown in the drawing, and is formed so that the inclined surfaces are fitted to each other at the time of assembly. The brake disc 13 and the ring 25 are members at both ends of the gear holding portion 19.

  The ring 25 is fitted to a wire drum drive shaft 8 (not shown), and is fixed so as to rotate integrally with the wire drum drive shaft 8 by a key 25a.

  FIG. 7 is a view for explaining the interaction between the brake disc 13 and the ring 25.

  As shown in FIG. 7, the brake disc 13 and the ring 25 are arranged so that the cam 13d and the cam 25d face each other, and at the time of assembly, the inclined surface of the cam 13d and the inclined surface of the cam 25d are arranged to fit each other.

  For example, when unloading, the gear 7 rotates in the unloading direction (clockwise direction) shown on the right side of FIG. 7 and the brake disc 13 rotates with the gear 7 as described with reference to FIG. A twist in the clockwise direction relative to 25 occurs. In the present specification, the relative twist direction of the brake disk 13 with respect to the ring 25 at the time of unloading is referred to as a “positive twist direction”.

  When the brake disk 13 rotates relative to the ring 25 in the positive twist direction, the inclined surfaces of the cam 13d and the cam 25d slide with each other, and the distance between the brake disk 13 and the ring 25 increases (extends). .

  When the distance between the brake disc 13 and the ring 25 increases, the brake disc 13 is pressed against a part of the ratchet plate 12 of the ratchet mechanism. A pawl 16 is attached to the inside of the case cover 4b so as to be swingable about an axis and biased inward by a coil spring. On the outer periphery of the ratchet plate 12, gears whose teeth are inclined are provided, and together with the pawls 16, a ratchet mechanism is formed. A friction material that increases the frictional force is provided on the plate surface of the ratchet plate 12. The ratchet plate 12 is sandwiched between the end plate 11 and the brake disc 13.

  Thereby, in unloading, the ratchet plate 12 pressed by the brake disc 13 rotates together with the gear 7, and when the gear 7 attempts to reverse, the ratchet mechanism acts to prevent the gear 7 from reversing.

  When unloading, the gear 7 rotates counterclockwise.

  When the gear 7 is reversed at the time of unloading, the brake disc 13 and the cams 13d and 25d of the ring 25 are fitted together, and the distance between the brake disc 13 and the ring 25 is reduced, so that the brake disc 13 and the ratchet The pressure on the plate 12 is weakened. For this reason, when unloading, the brake disc 13 can be reversed while sliding with respect to the ratchet plate 12, so that the gear 7 can be reversed.

  The operation of the winch device 1 will be described below based on the above configuration.

  First, the time of unloading will be described.

  At the time of unloading, the rotation of the motor 2 d is transmitted to the gear 7 via the drive shaft 6. The gear 7 is sandwiched between the two brake pads 14 and tries to rotate together with the brake disc 13 as described above, causing a positive twist with respect to the ring 25. As a result, the brake disc 13 and the cams 13d and 25d of the ring 25 are engaged with each other while acting in a direction in which the inclined surfaces slide apart.

  Since the cams 13d and 25d act in a direction away from each other, the brake disk 13 presses the ratchet plate 12 to apply pressure, and the ratchet plate 12 tries to rotate together with the brake disk 13. Since the ratchet pawl 16 is in the releasing direction, the ratchet plate 12 can rotate in the unloading direction. Therefore, the brake disc 13 rotates in the positive direction, and the ring 25 rotates accordingly.

  Since the ring 25 is fixed to the wire drum drive shaft 8 by the key 25a, if the ring 25 rotates, the wire drum drive shaft 8 also rotates, and the rotation of the gear 7 is transmitted to the wire drum 3, so that the load Pull up.

  On the other hand, since the reverse rotation of the ratchet plate 12 is limited by the ratchet mechanism, the reverse rotation of the gear 7 can be prevented in the unlikely event of pulling.

  Next, the unloading time will be described.

  At the time of unloading, the motor 2d rotates in the direction opposite to that at the time of unloading, and this rotation is transmitted to the gear 7 and tries to rotate the gear 7 in the direction opposite to that at the time of unloading (unloading direction).

  The rotation of the gear 7 in the unloading direction results in a twist in the direction opposite to the positive twist direction of the brake disk 13 with respect to the ring 25, whereby the inclined surfaces of the cams 13 d and 25 d are fitted to each other. Approach each other.

  As a result, the pressing force of the brake disc 13 against the ratchet plate 12 is weakened, so that the brake disc 13 can be slid and rotated with respect to the ratchet plate 12 and can be unloaded.

  Thus, when unloading, the motor 2d rotates in the direction opposite to that when unloading, and accordingly the gear 7 rotates, and the rotation is transmitted to the wire drum 3 via the wire drum drive shaft 8, and the load is Can be lowered. Further, the brake disc 13 can slide while rubbing the friction material of the ratchet plate 12, so that the brake can be applied, and an excessive burden is not applied to the motor 2d.

  Next, a case will be described in which an excessive load is suddenly applied and the gear holding portion 19 is fixed.

  As described above, when the load is unexpectedly increased (within an assumption) during unloading (for example, when the load is 150% or more of the specified load), the gear 7 and the brake pad 14 slip, and the motor 2d is seized. It comes to prevent.

  However, when an excessive load is suddenly applied, the cams 13d and 25d are separated excessively, and the distance between the brake disk 13 having the cams 13d and 25d and the ring 25 is increased. As a result, the brake disk 13 is ratchet. The brake disc 13 may be fixed by the force and reaction of the plate 12 being pressed strongly against the plate 12.

  Even when the brake disk 13 is fixed, rotation of the motor 2d in the unloading direction is maintained and seizure of the motor is prevented. However, when the motor 2d is rotated in the reverse direction, the cams 13d and 25d return to the fitted state. When the disk 13 is in a fixed state, the gear 7 idles and cannot return to the original state. In this case, the winch device 1 has conventionally only been available for repair. On the other hand, in the present invention, a releasing means is provided so that the fixed state can be released.

  FIG. 8 shows the operation of the release means of this embodiment.

  The releasing means of the present invention has first engaging means that rotates together with the gear 7 and second engaging means that rotates together with the brake disk 13.

  The first engaging means engages with the second engaging means of the brake disk 13 when the gear 7 rotates in the unloading direction, and the positive twist when the brake disk 13 is unloaded from the ring 25 is positive. Rotate in the opposite direction.

  In this embodiment, the spring pin 34 is the first engaging means, and the claws 33a and 33b of the claw plate 33 are the second engaging means.

  The spring pin 34 is inserted into a pin hole 35 provided in the gear 7, rotates together with the gear 7, protrudes toward the claw plate 33, and rotates in the unloading direction indicated by the arrow in FIG. , 33b.

  The claws 33a and 33b have inclined surfaces, and when the gear 7 rotates in the unloading direction, the tip of the spring pin 34 is moved over the inclined surface, but when the gear 7 rotates in the direction opposite to the unloading direction, the spring The pin 34 is engaged. That is, when the gear 7 rotates in the unloading direction, the spring pin 34 rotates the claw plate 33 within a half circumference.

  The claw plate 33 is rotated integrally with the plate 15 by a truss screw 36, and the plate 15 has a key that fits in the key groove of the cam 13d on the inner peripheral surface, so that it is integrated with the brake disc 13. It is designed to rotate.

  With the above structure, when the gear 7 rotates in the unloading direction indicated by the arrow in FIG. 8, the spring pin 34 engages with the claws 33a and 33b and the brake disc 13 is forcibly rotated within a half rotation.

  The rotation in the unloading direction of the brake disk 13 causes a twist in the direction opposite to the positive twist direction with respect to the ring 25, and the cams 13d and 25d are returned to a state in which the inclined surfaces are fitted to each other. Thereafter, normal operations for unloading and unloading can be performed.

  In the above description of the embodiment, an example of the shape of the claw plate has been described, but the present invention is not limited to this.

  Based on the above description, those skilled in the art may be able to conceive additional effects and various modifications of the present invention, but the aspects of the present invention are not limited to the above-described embodiments. Various additions, modifications, and partial deletions can be made without departing from the concept and spirit of the present invention derived from the contents defined in the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Winch device 2 Motor part 2a Motor cover 2b Fan case 2c Fan 2d Motor 3 Wire drum 4 Power transmission part 4a Case 4b Case cover 5 Outer shaft 6 Drive shaft 6a Drive shaft gear 7 Gear 8 Wire drum drive shaft 8a Wire drum drive gear 9 Wire drum gear 10a Side plate 10b Side plate 11 End plate 12 Ratchet plate 13 Brake disc 13d Cam 14 Brake pad 15 Plate 16 Pawl 17 Elastic mechanism 17a Belleville spring 17b Washer 17c Nut 18 Gear holding means 19 Gear holding portion 20 Wire 24 Twist Spring 25 Ring 25a Key 25b Spring pin 25d Cam 33 Claw plate 33a Claw 33b Claw 33c Hole 34 Spring pin 35 Pin hole 36 Truss screw

Claims (3)

A motor, a gear driven by the motor, a gear holding portion including a gear holding means for holding the gear via an elastic mechanism, a ratchet mechanism connectable to the gear holding portion, and the gear holding portion. A wire drum drive shaft driven by the gear, and a wire drum driven by the wire drum drive shaft,
The gear holding portion includes a pair of cams having fitted inclined surfaces, and when the gear rotates in the unloading direction, the cam is twisted in a relatively positive direction to extend the gear holding portion, thereby the ratchet mechanism. In the winch device that transmits the rotation of the motor to the wire drum while operating the ratchet mechanism,
The gear rotates in the unloading direction when the cam is excessively twisted in a relatively positive direction due to a sudden increase in load and the member of the gear holding portion is fixed to a part of the ratchet mechanism. A winch device having release means for releasing the fixed state by twisting the cam in a direction opposite to a positive twisting direction. The gear holding member comprises a brake disc provided with one cam of the pair of cams and a ring provided with another cam of the pair of cams,
The ring is fitted to rotate integrally with the wire drum drive shaft;
The brake disc and the ring are arranged so as to face each other so that the inclined surfaces of the cams fit together,
The release means includes first engagement means that rotates together with the gear, and second engagement means that rotates together with the brake disk,
The first engaging means of the gear engages with the second engaging means of the brake disc when the gear rotates in the unloading direction, and the brake disc is positive when the brake disc is unloaded from the ring. The winch device according to claim 1, wherein the winch device is rotated in a direction opposite to a twisting direction. The first engagement means comprises a spring pin provided so as to protrude from the side surface of the gear,
The second engaging means comprises a claw having an inclined surface provided on a claw plate that rotates integrally with the brake disc,
The claw is configured to allow the spring pin to ride on and pass through the inclined surface when the gear rotates in the unloading direction, and to engage with the spring pin when the gear rotates in the unloading direction. The winch device according to claim 2, wherein the winch device is provided.

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