JPH0455030Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a mechanical winch suitable for example for leisure vehicles, and more particularly to a support structure for a worm wheel and a drum.

(Prior Art) FIG. 4 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 35 and has an end rotatably supported by an end bracket 37. A drum 38 and a meshing clutch 39 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.

(Problem to be solved by the invention) However, the conventional mechanical winch mentioned above,
Since the drive shaft 33 is structured to pass through the inside of the drum 38, and the clutch 39 is also provided in parallel to the drive shaft 33, the drive shaft 33 needs to be quite long, and as a result, the weight of the winch increases. There is a problem in that the size increases and the overall width increases.

Therefore, an object of the present invention is to reduce the weight and size of a winch by providing a support structure for a worm wheel and drum that can omit a drive shaft.

(Means for Solving the Problems) In order to solve the above problems, the present invention is constructed as follows. That is, in a mechanical winch in which a drum is rotationally driven using a worm gear and a worm wheel that meshes with the worm gear as a power transmission mechanism, a boss portion is formed on the worm wheel, and the outer peripheral surface of one side in the axial direction of the boss portion is formed on the worm wheel. is rotatably supported by a flange formed on the gear case, and the other side is rotatably supported by a flange formed on the gear cover, the drum is arranged on the same axis as the worm wheel, and one end of the drum is The other end is rotatably supported by an end bracket by the gear case, and in the cylindrical hole of the boss portion, a shaft is provided on the inner circumferential surface of the cylindrical hole that can be moved in the axial direction by external operation and in a power transmission state. The present invention is characterized in that a spline shaft is installed which fits into both the splines formed on the drum and the splines formed on the inner circumferential surface of the cylindrical portion of the drum.

(Function) In the mechanical winch according to the present invention, by making the worm wheel and drum have the above-mentioned support structure, it is possible to omit the drive shaft, and the outer circumferential surface of the boss portion of the worm wheel can be omitted. By using the configuration in which the inner peripheral surface of the cylinder hole is used as a support surface and for power transmission, it is possible to support the boss part at both ends in the axial direction, and the spline for power transmission can be used in the axial direction. It becomes possible to form it over the entire length. (Example) Hereinafter, an example of the present invention will be specifically described based on the drawings. First, the embodiment shown in FIGS. 1 and 2 will be described. 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. It has a circular opening 3b with a small diameter. A cylindrical flange portion 4 for supporting a wheel is protruded inwardly in the wheel storage space 3 of the gear case 1, and a cylindrical flange portion 5 for supporting a drum is protruded from the outside of the gear case 1. The flange portion 5 for supporting the drum has a larger diameter than the flange portion 4 for supporting the wheel and is formed concentrically.

Reference numeral 6 denotes a case cover that closes the large-diameter circular opening 3a of the gear case 1, and a cylindrical flange portion 7 for supporting a wheel protrudes from the inner surface of the case cover.
It is set to have the same shape and concentricity as the wheel supporting flange part 4 in .

A worm gear 8 and a worm wheel 9 that mesh with the worm gear 8, which constitute a power transmission mechanism that transmits driving force to the drum 15, are arranged in the storage spaces 3a and 3b in the gear case 1. The worm wheel 9 has a boss portion 10 in the center that is slightly wider than the teeth, and one axial side of the boss portion 10 is fitted into a metal bushing 11 that is press-fitted into the flange portion 4 of the gear case 1. Further, the opposite side is fitted into a metal bush 12 which is press-fitted into the flange portion 7 of the case cover 6. That is, the worm wheel 9 has a structure in which the gear case 1 and the case cover 6 rotatably support the outer peripheral surface of the boss portion 10 on both sides in the axial direction. As shown in FIG. 2, the shaft 8a of the worm gear 8 is rotatably supported by the gear case 1 via a bearing 13 in the same manner as in the prior art.

On the other hand, a drum 15 winding the wire rope 14
is arranged on the same axis as the worm wheel 9, and has cylindrical parts 16 and 17 at both ends thereof that protrude outward from the flange part, and one cylindrical part 16 is formed on the outside of the gear case 1. The cylindrical portion 17 is fitted into the flange portion 5 for supporting the drum via a metal bushing 18, and the other cylindrical portion 17 is fitted into an end bracket 19 via a metal bushing 20, thereby being rotatably supported. Note that a stepped small diameter cylindrical portion 16a is concentrically protruded from the end of the cylindrical portion 16 on the gear case 1 side of the drum 15, and this small diameter cylindrical portion 16a is fitted into the small diameter circular opening 3b in the gear case 1. has been done.

Further, splines 21 and 22 are formed on the inner circumferential surface of the boss portion 10 of the worm wheel 9 and the inner circumferential surface of the small diameter cylindrical portion 16a at the end of the drum, respectively, and are always fitted into the splines 21 of the boss portion 10. The hub 23 as a spline shaft is attached to the boss part 1.
The small diameter cylindrical part 16 is slid in the axial direction into the cylindrical hole of
The rotation of the worm wheel 9 is transmitted to the drum 15 by fitting it into the spline 22 of a. That is, the spline 21,
22 and the hub 23 constitute a so-called clutch mechanism, and the hub 23 is rotatably attached to the tip of a shift rod 24 that passes through the center of the case cover 6 and extends into the gear case 1. It is being

The shift rod 24 is attached to the pin 26 on the case cover 6.
An operating lever 25 mounted so as to be tiltable via the
and is connected to each other by a pin 27, and is adapted to be pushed or pulled by tilting the operating lever 25. Further, the shift rod 24 is provided with a lock ball 29 at the fitting part with the case cover 6, which is biased by a lock spring 28 to lock the shift rod 24 in the operating position.
can be engaged with and disengaged from two engagement recesses 6a formed on the case cover 6 side.

Therefore, the mechanical winch configured as described above is mounted on the front part of a leisure vehicle, for example, and the gear case 1 is mounted on the gear case 1 (not shown).
and the end bracket 19 are fixed to the body of the vehicle, while the shaft 8a of the worm gear 8 is interlocked with the output shaft of the power take-off mechanism.

This embodiment is configured as described above,
Therefore, as shown by the solid line in FIG. 1, in the clutch disengaged state where the hub 23 is disengaged from the spline 22 of the small diameter cylindrical portion 16a, the drum 15 is in a state where it can freely rotate, so the wire rope 14 cannot be pulled out. I can do it. On the other hand, as shown by the imaginary line in FIG.
When the clutch is connected by fitting it into the spline 22 of a, the worm wheel 9
The rotation of the wire rope 1 is transmitted to the drum 15.
4 can be wound up.

Therefore, the mechanical winch of this embodiment has a structure in which the boss portion 10 of the worm wheel 9 is directly supported by the gear case 1 and the case cover 6, while the drum 15 is directly supported by the gear case 1 and the end bracket 19. By adopting this structure, the drive shaft, which was a necessary part in the conventional system, can be omitted, and the worm wheel 9 is less likely to rattle compared to the conventional system, in which the worm wheel 9 is attached to the drive shaft via a key. This provides stable sliding performance with no friction, and also facilitates assembly.

Next, another embodiment of the present invention shown in FIG. 3 will be described based on FIG. 3. This embodiment focuses on the fact that the worm wheel 9 is often made of the same material as a metal bush (generally made of a copper alloy), and the worm wheel 9 is made of a copper alloy. The metal button was abolished by giving it the function of a button. Therefore, according to this embodiment, the press-fitting work of the metal bushing can be omitted, and the ease of assembly is further improved.

In the illustrated embodiment, the clutch for power on/off is composed of the splines 21, 22 and the hub 23, but the clutch is not limited to this, and if necessary, a worm wheel 9 may be used.
It is possible to change the configuration to, for example, installing an electromagnetic clutch between the drum 15 and the drum 15. Furthermore, the mechanical winch of the present invention is not limited to cashier vehicles, but can also be generally used as a winch for factories.

(Effects of the invention) As detailed above, according to the invention, it is possible to omit the drive shaft, which has a large weight ratio in the winch, which was an essential component in conventional mechanical winches. This is effective in reducing weight and compactness.

In addition, in the present invention, the outer circumferential surface of the boss portion of the worm wheel can be supported from both sides by the gear case and the case cover, and the spline for power transmission can be formed on the inner circumferential surface of the boss portion over the entire length in the axial direction. Compared to a configuration in which the inner peripheral surface of the boss part of the worm wheel is configured such that one side in the axial direction is used for rotational support and the other side is used for spline, the present invention is more effective when the axial length is kept constant. It becomes possible to obtain stable support function and spline durability. Furthermore, with the configuration in which the outer circumferential surface of the boss portion of the worm wheel is supported from both sides by the gear case and the case cover, ease of assembly is also improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the mechanical winch of the present invention, FIG. 2 is a cross-sectional view taken along the line -- in FIG.
FIG. 3 is a longitudinal sectional view showing another embodiment of the present invention, and FIG. 4 is a longitudinal sectional view showing a conventional mechanical winch. 1... Gear case, 4, 5... Flange part, 6
... Case cover, 7 ... Flange section, 8 ... Worm gear, 9 ... Worm wheel, 10 ...
Boss part, 15...Drum, 16, 17...Cylindrical part, 19...End bracket, 21, 22...
Spline, 23...hub, 24...shift rod, 25...operation lever.

Claims (1)

[Scope of utility model registration request] In a mechanical winch in which a drum is rotationally driven using a worm gear and a worm wheel meshing with the worm gear as a power transmission mechanism, a boss is formed on the worm wheel, and the outer peripheral surface of one side in the axial direction of the boss is connected to the gear case. The outer peripheral surface of the other side is rotatably supported by a flange formed on the gear cover, and the drum is disposed on the same axis as the worm wheel, and one end of the drum is supported by the gear case. , the other end of which is rotatably supported by an end bracket, and within the cylindrical hole of the boss portion is a cylindrical tube that is movable in the axial direction by external operation and is provided on the inner circumferential surface of the cylindrical hole in the power transmission state. A mechanical winch equipped with a spline shaft that fits into both the spline and the spline on the inner peripheral surface of the cylindrical portion formed on the drum.