Winch device

Abstract

To provide a winch device that easily handles an unexpected circumstance or wear.SOLUTION: A winch device used for loading and unloading includes a motor part with a motor, a drum part with a drum around the outer surface of which a linear body is wrapped, and a power transmission part to transmit the motor power to the drum. The winch device rotates a driving shaft of the power transmission part from the outside.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a winch device. [Background technology]

[0002] 2. Description of the Related Art Conventionally, winch devices have been used for lifting and unloading construction materials and the like at construction sites and the like.

[0003] A winch device generally includes a driving motor, a drum around which a linear object (e.g., a wire, rope, chain, etc.) is wound, and a power transmission unit for transmitting the power of the motor to the drum. Gears and the like of the power transmission unit are housed in a case. Lifting and lowering of a load with a winch device is performed by winding the linear object tied to the load onto or unwinding it from the drum (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-2788 Summary of the Invention [Problem to be solved by the invention]

[0005] When using a winch device, unexpected circumstances may occur, such as a power failure due to a cut in the power cable, causing the motor to stop rotating. When this happens, the load being lifted must be lowered.

[0006] In a winch device, unexpected parts may be moved unexpectedly. For example, the power transmission part of a winch device generally has a ratchet mechanism, and the ratchet mechanism's pawl is attached to a mounting member that is fastened to the case from the outside. However, because this mounting member is fastened to the case from the outside, the assembled state of the pawl may be moved unexpectedly.

[0007] A winch device generally uses frictional force in the braking means, and therefore it is essential to deal with wear and tear, and a structure that can easily deal with this is desirable.

[0008] The present invention is intended to solve at least one of the above problems, and has an object to provide a winch device that can easily respond to unexpected circumstances or wear. [Means for solving the problem]

[0009] The present application includes a number of means for solving at least part of the above problems, examples of which are as follows: In order to solve at least part of the above problems, a winch device according to one aspect of the present invention is a winch device used for lifting and lowering a load, the winch device including a motor unit having a motor, a drum unit having a drum around whose outer circumferential surface a linear body is wound, and a power transmission unit for transmitting the power of the motor to the drum, and the drive shaft of the power transmission unit can be rotated from the outside.

[0010] The winch device includes a case that houses the gear of the power transmission unit, and the gear cover of the case has an insertion portion formed by penetrating the wall thickness at a position corresponding to the output shaft of the motor, and the drive shaft has one end that is directly or indirectly connected to the output shaft of the motor, and the other end, which is an external shaft portion, is inserted through the insertion portion of the gear cover and is on the outside.

[0011] The outer shaft portion may be a hexagonal shaft portion having a hexagonal cross section.

[0012] The power transmission unit may include a ratchet mechanism, and an attachment member for attaching a pawl of the ratchet mechanism may be installed inside a case that houses a gear of the power transmission unit.

[0013] The mounting member may have a fastening portion facing a side where the motor is disposed.

[0014] A cylindrical drum shaft may be connected to the drum on the side opposite to the side where the motor is disposed, and the drive shaft may be connected to an output shaft of the motor via an input shaft inserted into the drum shaft.

[0015] The drum shaft may have one end engaged with an engaging member fixed to the drum, and the other end rotatably supported by a supporting member fixed to a gear case of a case that houses a gear of the power transmission unit.

[0016] The drum shaft may be rotatably supported by the gear case at a portion between both ends.

[0017] The power transmission section includes a brake means, which comprises a transmission shaft parallel to the drive shaft, a brake disc fixed to the transmission shaft, a gear unit assembled to the transmission shaft, the gear unit including a transmission gear that meshes with a gear portion of the drive shaft, and a ratchet mechanism installed between the brake disc and the gear unit, wherein a feed screw mechanism is formed by a female thread portion provided on the gear unit and a male thread portion provided on the transmission shaft, and the gear unit may be provided with a gap adjustment mechanism that can finely adjust the gap of the brake means. Effect of the Invention

[0018] According to the present invention, a winch device that can easily cope with unexpected circumstances or wear can be provided.

[0019] Problems, configurations, and effects other than those described above will become apparent from the following description of the embodiments. [Brief description of the drawings]

[0020] [Figure 1] 1 is a diagram for explaining an example of a winch device according to an embodiment of the present invention; [Diagram 2] 1 is a diagram for explaining an example of a winch device according to an embodiment of the present invention; [Diagram 3] 1A to 1C are diagrams illustrating an example of a gear cover and an outer shaft portion of an embodiment of the present invention. [Figure 4] FIG. 2 is a diagram for explaining an example of a gear case according to an embodiment of the present invention. [Diagram 5] 1A-1C are diagrams illustrating examples of mounting members for a gear case and a pawl of an embodiment of the present invention. [Figure 6] FIG. 1 is a diagram for explaining an example of a pawl according to an embodiment of the present invention. [Figure 7] FIG. 2 is a diagram for explaining an example of a drum unit according to an embodiment of the present invention. [Figure 8] FIG. 2 is a diagram for explaining an example of a drum shaft according to an embodiment of the present invention. [Figure 9] 2 is a diagram for explaining an example of a power transmission unit according to an embodiment of the present invention; FIG. [Figure 10] FIG. 2 is a diagram showing an example of a screw disk according to an embodiment of the present invention. [Figure 11] 5A to 5C are diagrams for explaining examples of members to be assembled to the transmission shaft of the embodiment of the present invention. [Figure 12] 1A to 1C are diagrams illustrating an example of a pressing plate according to an embodiment of the present invention. [Figure 13] 4A to 4C are diagrams showing examples of a gap adjustment plate according to an embodiment of the present invention. [Figure 14] 5A to 5C are diagrams illustrating an example of a gap adjustment mechanism according to an embodiment of the present invention. [Figure 15] 11A and 11B are diagrams illustrating an example of adjustment of the gap adjustment mechanism according to an embodiment of the present invention. [Figure 16] 5A to 5C are diagrams for explaining an example of a gear clamping means according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, examples of embodiments of the present invention will be described with reference to the drawings. Note that components common to the following embodiments may be assigned the same reference numerals as those described above, and descriptions thereof may be omitted. In addition, when referring to the shape, positional relationship, etc. of components, etc., it is assumed that those that are substantially similar or similar to the shape, etc. are included, except when specifically stated otherwise or when it is considered in principle to be clearly different.

[0022] Fig. 1 is a diagram for explaining an example of a winch device according to an embodiment of the present invention, and is an overall assembly diagram for explaining the overall configuration of the example. In the diagram, J indicates the axis of the output shaft of the motor (the same applies in the following drawings). Fig. 2 is a diagram for explaining an example of a winch device according to an embodiment of the present invention, and is an external view observed from the gear cover side.

[0023] The winch device 100 of this embodiment is used for lifting and lowering a load. The winch device 100 includes a motor section M equipped with a motor 25, a drum section N equipped with a drum 4 around which a linear body (not shown, for example, a wire, rope, chain, etc.) is wound, and a power transmission section P for transmitting the power of the motor section M to the drum section N. The motor 25 is, for example, a DC motor, but is not limited thereto and may be other types as long as they are not contrary to the spirit of the present invention.

[0024] The winch device 100 of this embodiment is normally operated by the power of the motor 25. On the other hand, in the winch device 100 of this embodiment, the drive shaft 8 of the power transmission unit P can be rotated from the outside at a predetermined time, for example, in an emergency.

[0025] With this configuration, the winch device 100 of this embodiment can rotate the drive shaft 8 forcibly from the outside and lower the load being hoisted if the motor 25 stops rotating due to an unexpected circumstance (such as a power failure). In other words, the winch device 100 can rotate the drive shaft 8 without relying on the power of the motor 25 in an emergency.

[0026] The winch device 100 is not particularly limited, but preferably, the motor section M is disposed on one side of the drum section N, and the gears of the power transmission section P are disposed on the other side. In the following description of the winch device 100 and its components, the side on which the motor 25 is disposed is referred to as the motor side or motor arrangement side, and the opposite side is referred to as the cover side or cover arrangement side.

[0027] The winch device 100 has a frame member 3 for mounting the motor unit M as a support portion (frame portion), and a case Q for housing and protecting the gears of the power transmission unit P on the opposite side. The case Q has a gear case 1 for housing the gears of the power transmission unit P, and a gear cover 2 for covering and concealing the gears of the power transmission unit P from the outside. The gear cover 2 is provided with an attachment portion having a plurality of through holes on its outer periphery, and is fastened to the gear case 1 using fastening members. The winch device 100 may use any known technology for the support portion as appropriate, as long as it is not contrary to the spirit of the present invention.

[0028] The gear cover 2 preferably has an insertion portion 2a formed by penetrating the wall thickness at a position corresponding to the output shaft 25a of the motor 25. One end of the drive shaft 8 is directly or indirectly connected to the output shaft 25a of the motor 25, and the other end, which is an outer shaft portion 8b, is inserted through the insertion portion 2a of the gear cover 2 and is located on the outside.

[0029] The winch device 100 is not easy to assemble accurately once the gear cover 2 is removed, and removal at the site of use is not desirable. Since the outer shaft portion 8b of the winch device 100 is inserted through the insertion portion 2a of the gear cover 2 and is on the outside, the drive shaft 8 can be rotated from the outside using the outer shaft portion 8b at the site of use without removing the gear cover 2.

[0030] In the illustrated example, the drive shaft 8 has one end, or connecting end 8a, connected to the input shaft 12, and is indirectly (coaxially in the illustrated example) connected to the output shaft 25a of the motor 25 via the input shaft 12. Although not illustrated, the drive shaft 8 may have one end, or connecting end, directly connected to the output shaft 25a of the motor 25. In other words, the drive shaft 8 may have a configuration in which a single rod-shaped member including a portion corresponding to the input shaft 12 traverses the entire device except for the motor section M and passes through the insertion section 2a of the gear cover 2, with the outer shaft section 8b positioned on the outside.

[0031] The drive shaft 8 can be rotated from the outside using the external shaft portion 8b either manually or by connecting a rotation device to the external shaft portion 8b.

[0032] The outer shaft portion 8b is preferably a hexagonal shaft portion having a hexagonal cross section. By configuring it in this manner, it can be turned with a general tool or implement, and can be quickly dealt with in an emergency.

[0033] FIG. 3 is a diagram for explaining an example of a gear cover and an outer shaft portion according to one embodiment of the present invention, where (a) is a partially enlarged view of FIG. 1, and (b) is another example.

[0034] The drive shaft 8 has an inserted portion 8c near the outer shaft portion 8b located inside the insertion portion 2a, and is preferably rotatably supported by the insertion portion 2a via a bearing 41. As shown in the figure, an oil seal is preferably fitted onto the inserted portion 8c adjacent to the bearing 41.

[0035] The outer shaft portion 8b is preferably surrounded by a peripheral wall portion 2b as shown in Fig. 3(a). The peripheral wall portion 2b protrudes in a cylindrical shape from the gear cover 2 in the axial direction. As shown in the figure, the peripheral wall portion 2b is preferably formed integrally with the gear cover 2. The peripheral wall portion 2b may be formed separately from the gear cover 2 and fixed to the gear cover 2. Note that, as shown in Fig. 3(b), a configuration without the peripheral wall portion 2b may be used.

[0036] Although it depends on the site where the winch device 100 is used, it is expected that it will come into contact with or collide with other objects at construction sites and the like. By providing the peripheral wall portion 2b, it is possible to protect the outer shaft portion 8b on the outside of the gear cover 2 from unexpected contact with or collision with other objects. It is also possible to prevent dust and the like from adhering to the outer shaft portion 8b, making it difficult to turn.

[0037] More preferably, as shown in Fig. 3(a), a protective plate 42 is detachably attached to the end face of the peripheral wall portion 2b with a pan head screw or the like so as to cover the opening of the peripheral wall portion 2b. By providing the protective plate 42, it is possible to prevent collisions or contacts from the opening side with the outer shaft portion 8b. It is also possible to prevent dust and the like from adhering to the outer shaft portion 8b from the opening side.

[0038] 4 and 5 are diagrams for explaining an example of a gear case and a mounting member for a pawl of a ratchet mechanism according to an embodiment of the present invention. FIG. 4 is (a) a side view of the gear case observed from the cover side, and (b) a front view of the gear case observed from the front side. FIG. 5 is (a) a side view of the gear case observed from the motor side, its DD line cross section and EE line cross section, and (b) a diagram showing an example of a mounting member for a pawl. In the figure, X indicates the left-right direction (+X is right), Y indicates the up-down direction (Y is up), and Z indicates the depth direction (-Z is forward) (the same applies in each of the following figures). Also, A in the figure indicates a center line extending in the Y direction perpendicular to the axis J (the same applies in each of the following figures). Hereinafter, a preferred example of a mounting member for a pawl of a ratchet mechanism and a gear case 1 will be described.

[0039] As shown in FIG. 4, the gear case 1 preferably includes a plate-shaped portion 1a, a gear accommodating portion 1b, and a receiving portion 1c. The plate-shaped portion 1a is a generally plate-shaped portion extending on the XZ plane. The gear accommodating portion 1b is configured as a wall portion protruding from the plate-shaped portion 1a toward the cover side. The receiving portion 1c is a generally cylindrical portion extending in the axial direction, and a portion of the receiving portion 1c protrudes from the plate-shaped portion 1a toward the motor side. The receiving portion 1c has an inner periphery formed by the peripheral surface of a through hole that penetrates the plate-shaped portion 1a in the axial direction.

[0040] When viewed from the cover side, gear accommodating portion 1b has a roughly gourd-shaped inner circumferential surface having an upper arcuate portion and a lower arcuate portion, and is inclined roughly diagonally backward with respect to center line A. The center of the upper arcuate portion of gear accommodating portion 1b coincides with axis line J. B in the drawing indicates the center line of the accommodating portion that passes through the centers of the upper arcuate portion and the lower arcuate portion (the same applies in the following drawings).

[0041] The plate-like portion 1a has a recess 1d that is recessed toward the motor side with the center of the lower arc portion of the gear accommodating portion 1b as its center. The recess 1d has a substantially cylindrical internal space, and one end of the transmission shaft 10 described below is assembled via a bearing.

[0042] The gear housing 1b has a plurality of cover mounting parts 1e that protrude in the radial direction from the outer periphery. The cover mounting parts 1e have holes parallel to the axis J, and parallel pins are installed in the holes. The gear cover 2 is attached to the gear case 1 by aligning the mounting parts on the outer periphery with the cover mounting parts 1e and screwing fastening members such as hexagon socket bolts into the parallel pins. As a result, the part of the gear housing 1b within the inner periphery is covered and hidden by the gear cover 2. Note that when the insertion part 2a and the outer shaft part 8b are provided as described above, the outer shaft part 8b is not covered and is located on the outside.

[0043] The gear housing 1b is provided at its lower arcuate portion with a pawl attachment portion 1g that protrudes radially from the inner peripheral surface. The pawl attachment portion 1g is a portion for attaching a pawl 29 (see FIG. 6) described below to the gear case 1, and is provided according to the number of pawls 29. For example, when the number of pawls 29 is two, as in the illustrated example, two pawl attachment portions 1g, 1g1 and 1g2, are provided, and when the number of pawls 29 is one, any one of the pawls is provided. The pawl attachment portion 1g is provided with an attachment hole portion 1h for receiving an attachment member for attaching the pawl 29, and a spring hole portion 1i for hooking one end of a spring 28 described below.

[0044] By configuring the winch device 100 in this manner, the attachment member for the pawl can be installed inside the case Q, particularly so that it is covered and hidden by the gear cover 2. In the illustrated example, the attachment member for the pawl can be installed within an imaginary inner circumference of the lower arc portion of the gear housing portion 1b in the gear case 1 (see the imaginary inner circumference indicated by the dashed line in FIG. 4(a)). This makes it possible to prevent the assembled state of the pawl 29 from being unexpectedly moved from the outside, making it possible to respond to unexpected circumstances.

[0045] As shown in Figure 5(a), the mounting hole portion 1h penetrates from the cover side to the motor side, i.e., penetrates the gear accommodating portion 1b and the plate-shaped portion 1a, and has a first step portion 1ha with an opening on the cover side, a third step portion 1hc with an opening on the motor side, and a second step portion 1hb that is smaller in diameter than the two and connects the two.

[0046] As shown in FIG. 5(b), in the illustrated example, to attach one pawl 29, a set of attachment members, that is, two members, is used: a pin member 20 for attaching the pawl and a fastening member 61 for fastening to the case.

[0047] The pin member 20 preferably has a thread step 20a having a female thread portion 20f, a large-diameter abutment step 20b following the thread step 20a, a small-diameter spring step 20c following the abutment step 20b, and an even smaller-diameter pawl step 20d following the spring step 20c. The pawl step 20d has a split pin hole 20e penetrating in the diameter direction at a portion near the tip. The fastening member 61 for fixing (fastening) the pin member 20 to the gear case 1 has a head 61a and a male thread portion 61b, and is, for example, a hexagon socket bolt.

[0048] To fix the pin member 20 to the gear case 1, first, the screw step 20a of the pin member 20 is inserted from the cover side into the first step 1ha of the mounting hole 1h. Next, the male screw portion 61b of the fastening member 61 is inserted from the motor side into the third step 1hc of the mounting hole 1h, and is further advanced to be screwed into the female screw portion 20f of the pin member 20 in the first step 1ha. In the fixed state, the abutment step 20b of the pin member 20 abuts against the opening edge end surface of the first step 1ha. In this way, the fastening portion of the mounting member, which in the illustrated example is the fastening portion composed of the screw step 20a and female screw portion 20f of the pin member 20 and the fastening member 61, is installed on the motor arrangement side.

[0049] By locating the tightening portion on the motor arrangement side in this manner, the winch device 100 can prevent the assembled state from being moved unexpectedly even if the gear cover 2 is removed, and can handle unexpected circumstances.

[0050] FIG. 6 is a diagram for explaining an example of a pawl of a ratchet mechanism according to one embodiment of the present invention, and is an overall assembly diagram with a part of the gear cover cut away.

[0051] As shown in the figure, the ratchet mechanism of the power transmission unit P is composed of a gear part of the ratchet plate 16 attached to the transmission shaft 10 and a pawl 29 that engages with the gear part. Note that, for convenience, half of the ratchet plate 16 is omitted in the figure.

[0052] The pawl 29 is preferably used together with the torsion spring 28, the flat washer 62 and the split pin 63 as one pawl unit S. One pawl unit S may be provided, but in the illustrated example, two sets are provided. For ease of explanation, the flat washer 62 and the split pin 63 of the upper pawl unit S1 are omitted from the illustration.

[0053] The pawl unit S is attached to the protruding portion of the pin member 20 other than the screw step portion 20a, in other words, the portion of the pin member 20 other than the tightening portion, which is fixed in a state protruding toward the cover side parallel to the axis.

[0054] To attach (assemble) the pawl unit S to the pin member 20, first, as shown in the pawl unit S1, the coil portion of the torsion spring 28 is fitted onto the spring step 20c (see FIG. 5) of the pin member 20, and the pawl 29 is fitted onto the pawl step 20d. Next, as shown in the pawl unit S2, a flat washer 62 is fitted onto the pawl step 20d, and a split pin 63 is inserted into the split pin hole 20e. One end of the torsion spring 28 is hooked onto a spring pin installed in the spring hole 1i1, and the other end is hooked onto the pawl 29.

[0055] In this way, in the winch device 100, both the pawl 29 (pawl unit S in the illustrated example) and its mounting member can be installed inside the gear cover 2. Furthermore, the fastening portion of the mounting member can be installed on the motor side (see FIG. 1). This makes it possible to prevent the mounting state of the pawl 29 from being unexpectedly changed by moving the fastening portion of the mounting member from the outside.

[0056] Returning to Fig. 1, the explanation will be continued. In the drum unit N, the drum 4 is rotatably assembled to the gear case 1 and the frame member 3. Although not particularly limited, preferably, as in the illustrated example, the drum 4 has a cylindrical small diameter end portion 4a on the motor side, a bearing 51 is fitted onto the outer periphery of the end portion, and the drum 4 is inserted into a receiving portion of the frame member 3. The drum shaft 13 for rotating the drum 4 is formed into a substantially cylindrical shape, and is connected to the side of the drum 4 opposite to the side where the motor is disposed.

[0057] In the illustrated example, the input shaft 12 is inserted axially through the drum 4 and then inserted into the drum shaft 13. The drive shaft 8 has a connecting end 8a connected to the cover side end of the input shaft 12 and moves integrally with the input shaft 12. The drive shaft 8 and the input shaft 12 share a common axis with the drum shaft 13, but can rotate relatively to the drum shaft 13.

[0058] FIG. 7 is a diagram for explaining an example of a drum unit according to one embodiment of the present invention, and is an assembly diagram of the drum unit observed from the cover side.

[0059] As shown in the figure, a plate-shaped engaging member 5 is fixed to the inner peripheral end surface of the drum 4. The engaging member 5 is attached to the drum 4 using, for example, a hexagonal socket head screw or a spring pin. The engaging member 5 is provided with an engaging portion 5a that penetrates through the center in the plate thickness direction. The engaging portion 5a has a number of grooves (e.g., square splines) that recess in the radial direction for engaging (fitting) with an engaging end portion 13a of the drum shaft 13.

[0060] Fig. 8 is a diagram for explaining an example of a drum shaft according to an embodiment of the present invention, in which (a) is a diagram for explaining a support member, and (b) is a cross-sectional view of line FF in (a) for explaining the configuration related to the drum shaft. The gear case in Fig. 8(a) is shown in a state in which it is tilted approximately 20° backward from the state in Fig. 4(a).

[0061] As shown in Fig. 8(a), the support member 6 that supports the drum shaft 13 is fixed to the gear case 1. More specifically, the gear case 1 is provided with a plate mounting portion 1f (see Fig. 4(a)) next to the cover mounting portion 1e of the gear housing portion 1b. The support member 6 is a plate-shaped member that has a main body portion 6a that supports the drum shaft 13 and a mounting portion 6b for mounting to the gear case 1, and is formed compactly so as not to interfere with other members inside the case Q.

[0062] The support member 6 preferably has a main body portion 6a formed in a substantially annular shape. Three mounting portions 6b are formed extending radially from the main body portion 6a in a tongue-like shape and provided with through-holes so as not to interfere with the mounting of the gear cover 2 to the gear case 1. The support member 6 is fastened to the plate mounting portion 1f of the gear case 1 by inserting a stripper bolt 64, for example, through the through-holes of the mounting portions 6b. In the assembled state, the entire support member 6, including the mounting portions 6b, is covered and hidden by the gear cover 2 (see FIG. 2).

[0063] As shown in FIG. 8(b), the drum shaft 13 has an engagement end 13a which is one end thereof that engages with the engagement member 5, and a support end 13b which is the other end thereof that is supported by the support member 6 so as to be rotatable.

[0064] More specifically, the engaging end 13a has a protrusion (e.g., a square spline) on its outer periphery that corresponds to the engaging member 5, and engages (fits) with the engaging portion 5a of the engaging member 5. The supporting end 13b has a bearing 52 fitted onto its outer periphery, and is assembled to the supporting member 6 via the bearing 52.

[0065] The portion of the drum shaft 13 between both ends is further rotatably supported by the gear case 1. More specifically, a bearing 53 is fitted onto the outer periphery of the drum shaft 13 near the engagement end 13a, and the drum shaft 13 is attached to the receiving portion 1c of the gear case 1 via the bearing 53. More preferably, an oil seal is fitted onto the drum shaft 13 adjacent to the bearing 53. Since the drum shaft 13 is thus supported by the gear case 1 at two points on the outer periphery (a double-supported structure), the operation becomes more stable.

[0066] A drum gear 11 that meshes with a transmission shaft 10 (described later) is fixed to the drum shaft 13 at a portion of the outer periphery near a support end portion 13b.

[0067] A connecting portion between the drive shaft 8 and the input shaft 12 is disposed on the inner peripheral portion of the drum shaft 13. More preferably, the end of the input shaft 12 is assembled to the inner peripheral portion of the support end portion 13b via a bearing 43, and the connecting end portion 8a of the drive shaft 8 is assembled to the inner peripheral portion of the support end portion 13b via a bearing 44. By configuring the drive shaft 8 in this way, the operation becomes more stable.

[0068] In this manner, the portion of the winch device 100 that is assembled to the drum shaft 13 is disposed between the engagement member 5 and the support member 6 .

[0069] Returning to Fig. 1, the description will continue. The configuration of the power transmission unit P is not particularly limited, and any known technology may be used as appropriate. The illustrated example will be described in detail below as an example.

[0070] The power transmission unit P further includes a transmission shaft 10 extending parallel to the drive shaft 8. As described above, the motor side end of the transmission shaft 10 is attached to the recess of the gear case 1 via a bearing, and the cover side end is attached to the recess of the gear cover 2 via a bearing. Here, the members to be assembled with the transmission shaft 10 are disposed between the support member 6 and the gear cover 2.

[0071] Fig. 9 is a diagram for explaining an example of a power transmission unit according to an embodiment of the present invention, and is a gear assembly diagram. Fig. 10 is a diagram showing an example of a screw disk according to an embodiment of the present invention.

[0072] Here, the gear parts and gears (collectively referred to as "gears" in this application) that are installed on each of the above-mentioned shafts and transmit power will be described.

[0073] The drum gear 11 is fixed to the outer periphery of the drum shaft 13 by a fixing means (for example, a key 65) so as to move integrally with the drum shaft 13. The drum gear 11 is preferably a helical gear.

[0074] A gear portion (pinion) 8d that meshes with a transmission gear 9 (described later) is provided at approximately the middle of the drive shaft 8 in the longitudinal direction. The gear portion 8d is preferably a helical gear. The gear portion 8d may be formed separately and fixed to the drive shaft 8, but is preferably formed integrally with the drive shaft 8 as shown in the figure.

[0075] A gear portion (pinion) 10a that meshes with the drum gear 11 is provided on the transmission shaft 10 near the motor side end. The gear portion 10a is preferably a helical gear. The gear portion 10a may be formed separately and fixed integrally to the transmission shaft 10, but is preferably formed integrally with the transmission shaft 10 as shown in the figure.

[0076] A transmission gear 9 that meshes with a gear portion 8d of the drive shaft 8 is further attached to the transmission shaft 10. As described later, the transmission gear 9 is attached via a threaded disk 15, for example.

[0077] In the winch device 100, power from the motor unit M is transmitted generally through a path of a drive shaft 8, a transmission gear 9, a transmission shaft 10, a drum gear 11, and a drum shaft 13, and is then transmitted to the drum 4 after being decelerated.

[0078] Various measures are taken for the winch device 100 to ensure safe use.

[0079] First, a brake means is provided in the power transmission part P. The brake means includes, for example, a brake disc 14, a ratchet mechanism, and an integration means for rotating the transmission gear 9 and the brake disc 14 integrally during lifting. Here, a feed screw mechanism is used as the integration means, but other known techniques may be used as appropriate.

[0080] Specifically, in the illustrated example, the braking means is configured by assembling a brake disc 14, a ratchet plate 16, a gear unit U, and a torsion spring 81 on the transmission shaft 10 in this order from the motor side. That is, a ratchet mechanism is installed between the brake disc 14 and the gear unit U. The feed screw mechanism is composed of a female thread portion provided on the gear unit U and a male thread portion provided on the transmission shaft 10.

[0081] More specifically, the transmission shaft 10 is provided with a flange portion 10b at a predetermined distance from the gear portion 10a on the outer periphery, with a male thread portion 10c at a predetermined distance from the flange portion 10b, and further with a spring engagement portion 10d on the cover side. The male thread portion 10c is preferably a six-threaded thread. The spring engagement portion 10d is provided with a hole portion penetrating in the diametrical direction, into which a pin 31 for hooking one end of the torsion spring 81 is inserted. In the case where the power transmission portion P has a clearance adjustment mechanism to be described later, the spring engagement portion 10d is provided with an adjustment pin hole portion penetrating in the diametrical direction in parallel with the hole portion into which the pin 31 is inserted, on the motor side.

[0082] The brake disc 14 is fitted onto the transmission shaft 10 and fixed in contact with the flange portion 10b using fixing means (for example, a key 66). The brake disc 14 is preferably provided with a small diameter portion 14a having a small outer periphery on the cover side.

[0083] The ratchet plate 16 is a substantially annular member having a gear portion with inclined teeth on its outer periphery, and constitutes a ratchet mechanism together with the aforementioned pawl 29 (see FIG. 6). Friction material 16a that increases frictional force is provided on both end faces (plate faces) of the ratchet plate 16. The ratchet plate 16 is fitted onto the small diameter portion 14a of the brake disc 14 via a bearing 54. In other words, the ratchet plate 16 is attached to the transmission shaft 10 via the brake disc 14.

[0084] The gear unit U includes a transmission gear 9 that meshes with the gear portion 8d of the drive shaft 8. Here, the transmission gear 9 is assembled to the transmission shaft 10 via a screw disc 15 included in the gear unit U. The gear unit U may further include other members.

[0085] As shown in Fig. 10, the threaded disk 15 has a central hole penetrating in the axial direction, and a female thread 15a is provided on its inner peripheral surface. The female thread 15a is preferably a six-start thread. The threaded disk 15 is attached to the transmission shaft 10 so that the female thread 15a screws into the male thread 10c. The female thread 15a of the threaded disk 15 and the male thread 10c of the transmission shaft 10 form a feed screw mechanism.

[0086] The screw disk 15 has a small outer periphery on the cover side and has a small diameter portion 15b and a large diameter portion 15c with a larger diameter than the small diameter portion 15b. When the gear unit U is provided with a gear clamping means described later, the screw disk 15 may be provided with five bolt holes 15d and one nut groove 15e as shown in the figure in correspondence with the elastic mechanism. The five bolt holes 15d are holes that axially penetrate the thick portion between the female thread portion 15a and the small diameter portion 15b and reach the large diameter portion 15c, and are provided at equal intervals on a virtual circle that is concentric with the female thread portion 15a. The nut groove portion 15e is an annular groove that is provided so as to recess from the motor side end face concentric with the female thread portion 15a. The nut groove portion 15e is provided so as to communicate with the bolt hole portion 15d. The groove width of the nut groove portion 15e is larger than the diameter of the bolt hole portion 15d.

[0087] The transmission gear 9 is fitted onto the small diameter portion 15b of the threaded disc 15 and held by the threaded disc 15. The holding means is not particularly limited, and a known technique may be appropriately used, or a gear clamping means described later may be used.

[0088] 9, the torsion spring 81 is interposed between the gear unit U and the transmission shaft 10, and biases the gear unit U in a direction proceeding toward the brake disc 14. The torsion spring 81 has a coil portion fitted onto the spring engagement portion 10d of the transmission shaft 10, one end hooked onto a pin 31 inserted diametrically into the spring engagement portion 10d, and the other end hooked onto a spring hole portion provided in the axial direction of the gear unit U. A spring hole portion (which may be a groove) for hooking the other end of the torsion spring 81 is provided appropriately according to the configuration of the gear unit U, and may be provided in a component member of the gear unit U if the gear unit U has a gap adjustment mechanism described below, or may be provided in a component member of the gear unit U if the gear unit U has a gear clamping means described below, or may be provided in the threaded disc 15 if the gear unit U does not have these.

[0089] The brake means is set to a predetermined gap before shipment from the factory. That is, the brake means needs to have a predetermined gap that allows the moving part including the transmission gear 9 and the screw disc 15 to press the ratchet plate 16 against the brake disc 14 when lifting the load, while the pressing force needs to be relaxed when unloading the load.

[0090] Hereinafter, the operation of the winch device 100 will be described based on the above configuration.

[0091] When lifting a load, the rotation of the motor 25 is transmitted to the transmission gear 9 via the drive shaft 8. The screw disc 15 advances toward the brake disc 14 due to the rotation of the transmission gear 9 that it holds and the feed screw mechanism, and presses the ratchet plate 16 against the brake disc 14 to become one with the brake disc 14. In this direction, the ratchet mechanism formed by the ratchet plate 16 and the pawl 29 is not locked, so they rotate integrally with the transmission gear 9, and the rotational power is transmitted to the drum shaft 13 via the transmission shaft 10 and the drum gear 11, causing the drum 4 to rotate and lifting the load.

[0092] When the motor 25 stops, the drum 4 attempts to rotate in the unloading direction due to the weight of the suspended load, but this rotation is prevented by the integration of the above-mentioned members and the locking of the ratchet mechanism against reverse rotation.

[0093] When unloading, the motor 25 rotates in the opposite direction to when lifting, and this rotation is transmitted to the transmission gear 9 via the drive shaft 8. The screw disc 15 retreats to the opposite side due to the rotation of the transmission gear 9 in the opposite direction and the feed screw mechanism. This weakens the pressing force and creates a gap, allowing the brake disc 14 to rotate relative to the ratchet plate 16, and the drum 4 to rotate in the unloading direction.

[0094] When the motor 25 stops during lifting, the winch device 100 prevents the rotation of the drum 4 by the above-mentioned braking means, and the suspended state of the load is maintained. However, if the motor 25 stops due to a power failure such as a cut in the power cable, the load being lifted must be lowered.

[0095] As described above, the winch device 100 of this embodiment can rotate the drive shaft 8 from the outside using the external shaft portion 8b, and therefore can forcibly lower a suspended load. In other words, the winch device 100 is provided with a forced lowering means by providing the external shaft portion 8b.

[0096] Fig. 11 is a diagram for explaining an example of a member to be assembled to a transmission shaft of one embodiment of the present invention, and is a partially enlarged diagram of Fig. 9. Fig. 12 is a diagram showing an example of a pressing plate of one embodiment of the present invention. Fig. 13 is a diagram showing an example of a gap adjustment plate of one embodiment of the present invention, (a) a side view showing the end face on the cover side, and (b) a cross-sectional view. Fig. 14 is a diagram showing an example of a gap adjustment mechanism of one embodiment of the present invention. Fig. 15 is a diagram showing an adjustment example of the gap adjustment mechanism of one embodiment of the present invention.

[0097] The winch device 100 is preferably, but not limited to, equipped with a gap adjustment mechanism V that can finely adjust the gap of the braking means.

[0098] The clearance of the braking means is adjusted to a predetermined value appropriately at the time of shipment from the factory, but because frictional force is utilized, the clearance increases during use due to wear of the components (e.g., the brake disc 14). Therefore, it is necessary to repair the clearance that has increased due to wear during regular maintenance, etc. The clearance adjustment mechanism V makes it easier to handle this repair work.

[0099] The gap adjustment mechanism V includes, for example, a presser plate 18, a gap adjustment plate 19, a connecting member, and an adjustment pin 93.

[0100] The pressing plate 18 is disposed on the cover side of the transmission gear 9. As in the illustrated example, when the gear unit U has a gear clamping means described below, the pressing plate 18, which is part of the gear clamping means, is shared. When the gear clamping means is not provided, the screw disc 15 may be provided with the pressing plate 18 as part of the gap adjustment mechanism, or a separate dedicated pressing plate 18 may be provided.

[0101] As shown in Fig. 12, the pressing plate 18 has a central hole 18a penetrating in the plate thickness direction for fitting onto the transmission shaft 10. The pressing plate 18 has three first holes 18b, which are screw holes, and three second holes 18c provided at positions point-symmetrical to the first holes 18b on a virtual circle O1 that is concentric with the central hole 18a, as gap adjustment holes. The first holes 18b have an arrangement angle α formed by lines connecting the centers of the adjacent pressing plates 18 and the first holes 18b themselves, of, for example, 22°. As an example, the three second holes 18c have a maximum linear distance from the second hole 18c at one end to the second hole 18c at the other end that is approximately equal to the diameter of the central hole 18a.

[0102] When a gear clamping means described later is provided, the presser plate 18 has five through holes 18d arranged at equal intervals on an imaginary circle O2 between the imaginary circle O1 and the outer periphery in correspondence with the elastic mechanism. When a fixation releasing means described later is provided, the presser plate 18 has a pair of approximately semicircular protrusions on the outer periphery in correspondence with the fixation releasing means, and a screw hole 18e having a female screw on the inner periphery is provided inside the protrusions. In this way, the presser plate 18 is configured to be compatible with various means.

[0103] As shown in Fig. 13, the gap adjustment plate 19 has an engagement portion 19a that is provided in the center and penetrates in the plate thickness direction. The engagement portion 19a is a portion surrounded by a pair of opposing first arc portions 19b, a pair of opposing second arc portions 19c that are arc portions and have a larger radius than the first arc portions 19b, and two pairs of linear step portions 19d between the first and second arc portions 19b. The step portions 19d that form a pair are configured to be point symmetrical. The first arc portion 19b and the second arc portion 19c have a common center, the diameter of the first arc portion 19b is slightly larger than the transmission shaft 10, and the diameter of the second arc portion is slightly larger than the length of the adjustment pin 93.

[0104] The gap adjustment plate 19 has, as gap adjustment hole portions, three first holes 19e and three second holes 19f located at point-symmetric positions on an imaginary circle O3 that is the same size as the pressing plate 18. The three first holes 19e have an arrangement angle β formed by straight lines connecting the centers of adjacent gap adjustment plates 19 to their own centers of, for example, 33°. The first holes 19e are, for example, countersunk holes.

[0105] A pair of spring holes 19g are provided point-symmetrically on the outer periphery of the first arcuate portion 19b of the gap adjusting plate 19. In this example, the other end of the torsion spring 81 is hooked into the spring hole 19g.

[0106] As shown in FIG. 14, the gap adjustment mechanism V is assembled by stacking the presser plate 18 and the gap adjustment plate 19 and connecting the gap adjustment holes of both plates with a connecting member. The connecting member is, for example, a screw 91 (e.g., a hexagonal socket head screw) and a pin (e.g., a spring pin) 92. More specifically, the screw 91 is inserted through a predetermined first hole 19e of the three first holes 19e of the gap adjustment plate 19 and is screwed into a predetermined first hole 18b of the three first holes 18b of the presser plate 18. Furthermore, the pin 92 is inserted into a predetermined second hole 19f of the three second holes 19f of the gap adjustment plate 19 and a predetermined second hole 18c of the three second holes 18c of the presser plate 18. In the assembled state, the screw 91 and the pin 92 are positioned point-symmetrically.

[0107] The adjustment pin 93 is inserted into the adjustment pin hole of the transmission shaft 10, and in the assembled state is installed in the engagement portion 19a of the gap adjustment plate 19. If the feed screw mechanism of the brake means is a right-handed screw, as shown in the figure, both ends of the adjustment pin 93 abut against the stepped portion 19d on the right side during lifting.

[0108] 15, the gap adjustment mechanism V can finely adjust the gap of the braking means by adjusting the combination of the gap adjustment hole of the gap adjustment plate 19 and the pressing plate 18 and adjusting the installation angle (contact angle) of the adjustment pin 93. As an example, in the illustrated example, it can be adjusted to 7 levels with an angle difference of 11 degrees per level.

[0109] For example, if the state in Figure 15(a) is the shipping state with an installation angle of 0 degrees, then in Figure 15(b) the installation angle of the adjustment pin 93 has been adjusted by 11 degrees and advanced 11 degrees to the right, so the gap in the braking means is narrowed by that amount. Also, in Figure 15(c) the installation angle of the adjustment pin 93 has been adjusted by 22 degrees and advanced 22 degrees to the right, so the gap in the braking means is narrower by that amount. The stage (pattern) to which the gap in the braking means is adjusted can be set according to the gap that has widened due to wear on the object to be repaired.

[0110] The winch device 100 is provided with a gap adjustment mechanism V, which allows the gap in the brake means that has widened due to wear to be easily repaired according to the wear state. Here, adjustment can be made visually, and adjustment can be made to any stage (adjustment pattern) according to the wear state, reducing the number of steps required for the work.

[0111] Furthermore, by providing the gap adjustment mechanism V, it is possible to easily fine-tune the gap not only when repairing the gap during maintenance, but also when shipping. In particular, when a six-start screw is used in the feed screw mechanism, fine adjustment at the time of shipping takes time, but by using the gap adjustment mechanism V, adjustment is easy and the number of work steps can be reduced.

[0112] The number of gap adjustment holes and the installation angle of the gap adjustment mechanism V are not limited to those described above, and can be set according to the configuration of the feed screw mechanism used and the characteristics of the brake disc.

[0113] FIG. 16 is a development view for explaining an example of the gear clamping means and the fixation releasing means according to one embodiment of the present invention.

[0114] The power transmission part P is not particularly limited, but preferably includes a gear clamping means as shown in Figures 11 and 16. The gear clamping means is provided in the gear unit U so as to clamp the transmission gear 9.

[0115] The winch device 100 may be subjected to a load exceeding the specified load during lifting (for example, when the load reaches the uppermost end). In this case, even though the drum 4 cannot rotate, a current flows through the motor 25, causing a load and resulting in a breakdown such as burning. The gear clamping means is provided to prevent this from happening.

[0116] In the illustrated example, the gear clamping means includes a screw disc 15, a pair of brake pads 24 installed on both sides of the transmission gear 9, a presser plate 18, and an elastic mechanism that holds them together. The screw disc 15 and the presser plate 18 have been described above, and description thereof will be omitted here.

[0117] The brake pad 24 is fitted onto the small diameter portion 15b of the threaded disc 15 so as to contact both end surfaces of the transmission gear 9. As an example, the transmission gear 9 has recesses on both end surfaces, and the brake pad 24 is assembled so that a part of the thickness of the brake pad 24 fits into the recesses of the transmission gear 9.

[0118] In this embodiment, five elastic mechanisms are used, each of which includes one stripper bolt 71, a square nut 72, a coil spring 73, and a flat washer 74. The coil spring 73 is preferably a rectangular wire coil spring. The stripper bolt 71 has a shaft portion fitted with the flat washer 74 and the coil spring 73, which is inserted through the through hole portion 18d of the pressing plate 18 and the bolt hole portion 15d of the screw disk 15, and the threaded portion reaches the nut groove portion 15e of the screw disk 15 and is screwed into the square nut 72 in the nut groove portion 15e. The elastic mechanism is adjusted at the time of shipment from the factory or during maintenance so as to press the brake pad 24 against the transmission gear 9 with an appropriate force.

[0119] The winch device 100 is provided with a gear clamping means, so that slippage does not occur between the transmission gear 9 and the brake pad 24 during normal operation. However, when a certain load greater than a specified load is applied, the brake pad 24 that clamps the transmission gear 9 and the transmission gear 9 slip, causing only the transmission gear 9 to spin freely, preventing damage to the device due to excessive torque.

[0120] Although not particularly limited, the power transmission portion P preferably further includes a lock release means as shown in Figures 11 and 16. The lock release means is provided in the gear unit U.

[0121] When an excessive load is suddenly applied to the winch device 100 during hoisting, for example, a stuck state may occur in which the joint surfaces of the screw disc 15 and the ratchet plate 16 are difficult to separate. If the stuck state becomes too strong, even if the motor 25 is rotated in the reverse direction, the transmission gear 9 may simply rotate freely and not return to its original state. The sticking release means is intended to release such sticking.

[0122] In the illustrated example, the fixing release means includes a claw plate 17 and a spring pin 68 inserted into the transmission gear 9 .

[0123] The spring pin 68 is inserted into the transmission gear 9 so as to protrude towards the claw plate 17. The spring pin 68 rotates together with the transmission gear 9.

[0124] The claw plate 17 is made of a roughly flange-shaped metal plate, and is fixed to the screw hole 18e of the pressing plate 18 by a truss screw 67. The claw plate 17 has a notch on the periphery, and a portion of the metal is folded back to form a pair of claws 17a, 17b having inclined surfaces as shown in the figure.

[0125] The claw plate 17 has inclined claws 17a, 17b, which ride over the tip of the spring pin 68 when the transmission gear 9 rotates in the lifting direction, but engages with the spring pin 68 when the transmission gear 9 rotates in the reverse direction. In other words, when the transmission gear 9 rotates in the unloading direction, the spring pin 68 turns the claw plate 17 within half a revolution.

[0126] As described above, since the winch device 100 is provided with the lock release means, when the transmission gear 9 rotates in the unloading direction, the spring pin 68 engages with the claws 17a, 17b within half a turn, forcing the screw disk 15 to rotate. This causes the screw disk 15 to leave the ratchet plate 16, enabling normal lifting and unloading operations to be performed, and the locked state is released.

[0127] In this way, various measures are taken to ensure the safe use of the winch device 100. Some of these measures may be taken, or all of them may be taken. When all of them are taken, some of the members may be shared or linked together as described above.

[0128] Although the embodiment of the present invention has been described above, it is merely one example of the present invention, and the present invention is not limited thereto. The present invention includes combinations of the above-mentioned embodiments and their modifications, as well as various modifications. Various additions, modifications, and partial deletions are possible within the scope of the conceptual idea and intent of the present invention derived from the contents defined in the claims and their equivalents. [Explanation of symbols]

[0129] 1...gear case, 2...gear cover, 3...frame member, 4...drum, 5...engagement member, 6...support member, 8...drive shaft, 8b...external shaft portion, 9...transmission gear, 10...transmission shaft, 11...drum gear, 12...input shaft, 13...drum shaft, 14...brake disc, 15...screw disc, 16...ratchet plate, 17...claw plate, 18...pressure plate, 19...gap adjustment plate, 20...pin member, 29...pawl, 61...fastening member, 93...adjustment pin, 100...winch device, M...motor portion, N...drum portion, P...power transmission portion, Q...case, S...pawl unit, U...gear unit, V...gap adjustment mechanism.

Claims

1. A winch device used for lifting and lowering a load, A motor unit including a motor; A drum unit including a drum around which a linear object is wound; a power transmission unit for transmitting the power of the motor to the drum, The drive shaft of the power transmission unit can be rotated from the outside. A winch device comprising:

2. The winch device includes a case that houses a gear of the power transmission unit, the gear cover of the case has an insertion portion formed by penetrating the thickness of the gear cover at a position corresponding to the output shaft of the motor; The drive shaft has one end directly or indirectly connected to the output shaft of the motor, and the other end, which is an outer shaft portion, is inserted through the insertion portion of the gear cover and is located on the outside.

2. A winch device as claimed in claim 1 .

3. The outer shaft portion is a hexagonal shaft portion having a hexagonal cross section.

3. A winch device as claimed in claim 2.

4. The power transmission unit includes a ratchet mechanism. The attachment member for attaching the pawl of the ratchet mechanism is installed inside the case that houses the gear of the power transmission unit.

2. A winch device as claimed in claim 1 .

5. The fastening portion of the mounting member faces the motor arrangement side.

5. A winch device as claimed in claim 4.

6. A cylindrical drum shaft is connected to the opposite side of the drum from the side where the motor is disposed, The drive shaft is connected to the output shaft of the motor via an input shaft inserted into the drum shaft. A winch device according to claim 1 or 4, characterized in that

7. The drum shaft has one end engaged with an engagement member fixed to the drum, and the other end rotatably supported by a support member fixed to a gear case of a case that houses the gear of the power transmission unit. A winch device as claimed in claim 6.

8. The drum shaft is rotatably supported by the gear case at a portion between both ends. A winch device as claimed in claim 7.

9. The power transmission unit includes a brake means, The braking means is A transmission shaft parallel to the drive shaft; A brake disc fixed to the transmission shaft; a gear unit attached to the transmission shaft, the gear unit including a transmission gear that meshes with a gear portion of the drive shaft; a ratchet mechanism disposed between the brake disc and the gear unit, a feed screw mechanism is formed by a female thread portion provided on the gear unit and a male thread portion provided on the transmission shaft, The gear unit is provided with a gap adjustment mechanism that can finely adjust the gap of the brake means. A winch device according to claim 1 or 4, characterized in that

Images