JPH0565436B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mechanical winch suitable for, for example, leisure vehicles, and more specifically, the present invention relates to a mechanical winch that is equipped with a clutch mechanism for transmitting or cutting off power to a drum. Regarding mechanical winches.

(Prior Art) FIG. 5 shows an example of a conventional mechanical winch used in leisure vehicles. As shown in the figure, a worm wheel 32 that meshes with a worm gear 31 is coupled to one end of a drive shaft 33 via a key 34. One side of the drive shaft 33 is rotatably supported by a gear case 35 and a case cover 36, and the other side extends from the gear case 36 and has an end rotatably supported by an end bracket 37. A drum 38 and a dog-type clutch are arranged side by side on the extending portion of the drive shaft 33, and by sliding the clutch 39 in the axial direction as shown by the arrow in the figure, the drive shaft 33 and the drum 38 are connected. It is designed to combine or separate.

(Problems to be Solved by the Invention) Due to the structure of the conventional mechanical winch described above, the drive shaft 33 is an essential structural member. That is, since it is necessary to visually confirm the engagement of the clutch 39, the drive shaft 33 is required to be installed with the clutch exposed to the outside. However, since the drive shaft 33 is heavy and requires a considerable length, there is a problem in that the winch becomes heavier and wider.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an improved mechanical winch in which the drive shaft can be omitted by incorporating the clutch, and the clutch can be connected and disconnected reliably and easily. .

(Means for Solving the Problems) The present invention for solving the above problems rotatably supports the outer circumferential surface of a boss formed on a worm wheel by a gear case and a case cover, while at the same time forming a boss formed on one end of a drum. The cylindrical part is rotatably supported by a boss part of a worm wheel or a gear case, and the other end part of the drum is rotatably supported by an end bracket, and the cylindrical part is concentrically aligned with the inner peripheral surface of the boss part. A spline is formed on the inner circumferential surface of the hub, and the hub is configured to transmit power by fitting into both splines, and to cut off power transmission by separating from one of the splines in the axial direction. A shift rod for slidingly operating the hub is slidably inserted into the hub, and two shift springs act to cause the hub to follow the direction of movement of the shift rod. The gist is that the and the shift rod were connected.

(Function) As described above, the worm wheel is supported by the gear case and the case cover, while the drum is supported by the gear case and the end bracket, and the boss part of the worm wheel and the inner peripheral surface of the cylindrical part of the drum are respectively formed. By configuring the clutch mechanism with a spline and a hub that serves as a spline shaft that fits into the spline,
The driveshaft will be omitted. When the hub is slid in the axial direction by the shift shaft, the hub is moved to follow the shift shaft via the shift spring, thereby ensuring that the spline can be inserted into or removed from the spline reliably.

(Example) Hereinafter, an example of the present invention will be specifically described based on FIGS. 1 to 4. In the figure, 1 is a gear case equipped with a gear storage space 2 for storing a worm gear and a wheel storage space 3 for storing a worm wheel. One of the wheel storage spaces 3 has a large diameter circular opening 3a, and the other has a large diameter circular opening 3a. The circular opening 3b has a smaller diameter than that, and the circular opening 3b has a smaller diameter.
constitutes a cylindrical portion for supporting the wheel. A case cover 4 is attached to the gear case 1 so as to close the large diameter circular opening 3a of the gear case 1, and a cylindrical flange 5 for supporting a wheel is protruded from the inner surface of the case cover. 5 has a larger diameter than the small diameter circular opening 3a of the gear case 1 and is formed concentrically.

A worm gear 6 and a worm wheel 7 that mesh with the worm gear 6 constituting a power transmission mechanism that transmits driving force to the drum 11 are arranged in the storage spaces 3a and 3b of the gear case 1, and the worm wheel 7
is provided with a step-like boss portion 8 wider than the tooth portion at its center. In other words, the boss portion 8 is formed in a stepped shape with approximately the central portion in the axial direction as the border so as to correspond to the inner diameter of the small-diameter circular opening 3b in the gear case 1 and the inner diameter of the flange portion 5 of the case cover 4. . Thus, the worm wheel 7 can be rotated by fitting the large diameter side of the boss part 8 into the small diameter circular opening 3b of the gear case 1 and fitting the small diameter side of the boss part 8 into the flange part 5 of the case cover 4. is supported by Further, in this embodiment, the worm wheel 7 is made of a material capable of functioning as a metal bushing, such as a copper alloy, thereby omitting the metal bushing originally required for the sliding surface. As shown in FIG. 2, the shaft 6a of the worm gear 6 is rotatably supported by the gear case 1 via a bearing 9 in the same manner as in the prior art.

On the other hand, a drum 11 winding the wire rope 10
is provided with concentric cylindrical portions 12 and 13 that protrude outward from the flange portion at both ends thereof. One cylindrical part 12 is rotatably supported by an end bracket 14 via a metal bush 15. On the other hand, the cylindrical part 13 on the opposite side, that is, on the side of the gear case 1, has a two-stage structure with a smaller outer diameter on the tip side. It is formed into a cylindrical shape, and the large diameter part is fitted into the small diameter circular opening 3b of the gear case 1, and the small diameter part is fitted into the large diameter side of the boss part 8 of the worm wheel 7 and rotatably supported. has been done. Note that the rotational support of the cylindrical portion 13 may be performed by either the gear case 1 or the worm wheel 7. For example, when supporting the cylindrical portion 13 by the worm wheel 7, it is not shown in the figure for the same reason as described above. The metal bushings are omitted, as in

Therefore, the inner peripheral surface of the small diameter side of the boss portion 8 of the worm wheel 7 and the inner peripheral surface of the small diameter side of the cylindrical portion 13 of the drum 11 are set to have the same diameter, and splines 16 and 17 are formed respectively. Then, the rotation of the worm wheel 7 is transmitted to the drum 11 by sliding the hub 18 as a spline shaft that is always fitted into the spline 17 of the cylindrical part 13 in the axial direction and fitting into the spline 16 of the boss part 8. It's becoming like that. That is, the splines 16 and 17 and the hub 18 constitute a so-called clutch mechanism, and the hub 18 extends into the gear case 1 by penetrating the center of the case cover 4 so as to be slidable in the axial direction. It is designed to be operated by a shift rod 19.

The shift rod 19 slidably passes through the center of the hub 18, and is connected to the hub 18 via two tension shift springs 20, 21. That is, a fixed plate 22 is fitted to the shift rod 19, and a movable plate 23 is slidably fitted to the shift rod 19, and a first shift spring 20 is interposed between the plates 22 and 23. A second shift spring 21 is interposed between a spring receiver 24 formed on the hub 18 and the movable plate 23. Note that both ends of these two shift springs 20 and 21 are connected to the plate 2 as shown in the figure.
2, 23 and a spring receiver 24. However, both shift springs 20, 2
1 is set to be held in a contracted (free) state as shown in FIG. 1 under normal conditions (clutch disengaged state).

Further, the shift rod 19 is connected via a pin 27 to an operating lever 26 which is tiltably attached to the case cover 4 via a pin 25, and is pushed or pulled by the tilting operation of the operating lever 26. It's summery. Furthermore, the shift rod 19 is provided with a lock ball 29 at the fitting part with the case cover 4, which is biased by a lock spring 28 to hold it in the operating position, that is, the clutch connection position and the clutch disengagement position. It is possible to engage and disengage from two engagement recesses 4a formed on the cover 4 side.

The mechanical winch configured as described above is mounted, for example, on the front of a leisure vehicle, and although not shown, the gear case 1 and end bracket 14 are fixed to the body of the vehicle. Meanwhile, the shaft portion 6a of the worm gear 6 is interlocked with the output shaft of the power take-off mechanism.

This embodiment is configured as described above,
Therefore, as shown in FIG.
When the clutch is disengaged from the spline 16, the drum 11 can freely rotate, so the wire rope 10 can be pulled out.

In this state, when the shift rod 19 is pulled out by tilting the operating lever 26 as shown in FIG. 3 in order to connect the clutch, the lock ball 29 enters the engagement recess 4a on the clutch connection side and holds the shift rod 19 in that position. do. At this time, if the phases of the splines 16 and 17 match, the hub 18 is moved together with the shift rod 19 and is smoothly fitted into the spline 16 of the boss portion 8 as shown by the imaginary line in the figure, and the rotation of the worm wheel 7 is transferred to the drum 11. will be communicated to.

However, if the splines 16 and 17 are out of phase, as the shift rod 19 moves, the first shift spring 20 anchored to the fixed plate 22 will extend as shown by the solid line in the figure. That is, since the second shift spring 21 is in the contracted state and the movable plate 23 cannot move, the first shift spring 20 is expanded. Thereafter, when the phases of both splines 16 and 17 match due to the rotation of the worm wheel 7, the hub 18 is moved by the tensile force of the first shift spring 20 and is fitted into the spline 16 of the boss portion 8.
Worm wheel 7 and drum 11 are coupled.
The drum 11 is therefore rotated.

On the other hand, in order to disconnect the clutch, the operating lever 26 is tilted as shown in FIG.
When the shift rod 19 is pushed in, the lock ball 29 enters the engagement recess 4a on the clutch disconnection side and holds the shift rod 19 in that position. At this time, if no load is applied between both splines 16 and 17, the hub 18 will move smoothly and will separate from the spline 16 of the boss portion 8 as shown by the imaginary line in the figure, and the worm wheel 7 and drum 11 will be separated from each other. The connection is released and power transmission is cut off.

However, if the hub 18 cannot move smoothly due to a load being applied between the splines 16 and 17, the second shift spring 21 will extend as shown by the solid line in the figure, but the subsequent rotation of the worm wheel 7 will cause the hub 18 to move smoothly. When the load between 16 and 17 is removed, the hub 18 comes out of the spline 16 of the boss portion 8 due to the tensile force of the second shift spring 21, returning to the state shown in FIG.

In the description of this embodiment, the mechanical winch is applied to a leisure vehicle, but it is also possible to apply it to a general factory. Further, there is no problem in changing the always-fitting spline of the hub 18 from the spline 17 on the drum side to the spline 16 on the worm wheel side, and the seat springs 20 and 21 are not limited to the method using tensile force. By partially changing the assembly structure, it is possible to change to a type that utilizes compressive force.

(Effects of the Invention) As detailed above, according to the present invention, by incorporating the clutch, it is possible to omit the drive shaft, which has a large weight ratio in the winch, which was an essential component in the past. This is extremely effective in making the winch lighter and more compact.
Moreover, in the present invention, the spline and the hub constitute a clutch, and the hub is configured to follow the shift shaft as its operation means by means of two shift springs, so that the hub is fitted onto the spline. The engagement and disengagement, that is, the clutch operation, can be performed reliably and easily without the need for visual confirmation, and operability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the mechanical winch of the present invention, FIG. 2 is a sectional view taken along the line -- in FIG. 1,
FIG. 3 is a vertical cross-sectional view showing how the clutch connects, FIG. 4 is a vertical cross-sectional view showing how the clutch disconnects, and FIG. 5 is a vertical cross-sectional view showing a conventional mechanical winch. 1... Gear case, 4... Case cover, 6...
... Worm gear, 7... Worm wheel, 8...
...Boss part, 11...Drum, 12, 13...Cylindrical part, 14...End bracket, 16, 17...
Spline, 18...Hub, 19...Shift rod, 20, 21...Shift spring, 26...
Operation lever.

Claims (1)

[Claims] 1 The outer peripheral surface of the boss formed on the worm wheel is rotatably supported by the gear case and case cover, while the cylindrical part formed at one end of the drum is supported by the boss of the worm wheel or the gear case, and the other end of the drum is supported rotatably by the gear case and case cover. Each is rotatably supported by an end bracket, and splines are formed on the inner circumferential surface of the boss portion and the inner circumferential surface of the cylindrical portion concentrically aligned therewith, and the splines are fitted into both splines. A hub is arranged so as to be slidable in the axial direction, and a shift rod for slidingly operating the hub is attached to the hub. A mechanical winch that connects a hub and a shift rod with two shift springs that slidably pass through the hub and move the hub in the direction of movement of the shift rod.