JPH05139695A - Winch - Google Patents

Abstract

PURPOSE:To prevent lowering of rotation efficiency of a winch drum and prevent a winch from becoming large in dimensions. CONSTITUTION:A winch 2 is provided with; a driving shaft 10 rotatably supported by a bearing part 13 formed in a gear case 3; a sun gear 16 engaged with the driving shaft 13 and driven to rotate; a planetary gear train G rotatably supported by a carrier 18, which is rotatable coaxially with the sun gear 16, and meshed with the sun gear 16; a fixed ring gear 21 fixed to the gear case 3 side and meshed with the planetary gear train G; and a movable ring gear 22 connected to the winch drum 5 side and meshed with the planetary gear train G. In this winch 2, the carrier 18 is provided with a support part 25 rotatably supported on an outside periphery of the bearing part 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winch, and more particularly to a winch mounted on an off-road vehicle or the like and used for lifting or pulling luggage.

[0002]

2. Description of the Related Art Conventionally, a reduction mechanism of an electric winch of this type is composed of a planetary gear train composed of three planetary gears and a ring gear, and rotation from a drive shaft is increased by the action of the three planetary gears. Then, it is adapted to be transmitted to the winch drum via the output shaft. However, for this electric winch,
In order to obtain a target reduction ratio (generally about 1/150), a three-stage planetary gear train composed of three sets of planetary gears and ring gears is adopted. Therefore, there are problems that the number of parts is large, the structure is complicated, the weight is increased, and the size is increased.

Here, the present applicant has already proposed an electric winch having a reduced number of parts, a simplified structure and a reduced size as shown in FIG. In this electric winch, a winch drum 52 is rotatably provided with respect to a gear case 51. Further, an electric motor (not shown) is arranged in the winch drum 52, and a drive shaft 53 which can be rotated in the forward and reverse directions by the electric motor penetrates the end plate 54 and projects to the outside of the winch drum 52. The drive shaft 53
The tip end of is inserted into a cylindrical bearing portion 55 provided inside the gear case 51. A bearing 56 is interposed between the drive shaft 53 and the bearing portion 55. Therefore, the tip of the drive shaft 53 is rotatably supported by the bearing portion 55 via the bearing 56.

Further, the gear case 51 and the end plate 54
A spline 57 is formed on the outer peripheral surface of the drive shaft 53 between
The sun gear 58 is meshed with the spline 57. Then, around the sun gear 58, three planetary gears 59 meshing with the sun gear 58 are arranged so as to support at three points, and these planetary gears 59 are the carrier 60.
Is rotatably supported by a shaft 61 attached to the. still,
The carrier 60 is composed of two discs 61a and 61b arranged on both end faces of the planetary gear 59 in the axial direction.
The a and 61b are connected in a circumferential direction by a plurality of stepped connecting pins 62 while being held at a constant interval.

A fixed ring gear 63 and a movable ring gear 64, which are arranged side by side, are meshed with the sun gear 58. The fixed ring gear 63 is fitted to the inner peripheral surface of the cylinder of the gear case 51, and is fixed by the key 65. The movable ring gear 64 is fitted to the inner peripheral surface of the cylindrical portion of the winch drum 52, which projects outward from the end plate 54, and is fixed by a key 66. The movable ring gear 64 has one to three more teeth than the fixed ring gear 63.

The drive shaft 5 is driven by driving the electric motor.
When 3 rotates, the sun gear 58 rotates. Therefore, the planetary gear 59 meshing with the sun gear 58 rotates (revolves) around the sun gear 58 while rotating (spinning) around the drive shaft 53. At this time, the planet gear 59 is replaced by the sun gear 58.
When the movable ring gear 64 makes one revolution around, i.e., one revolution, the movable ring gear 64 rotates by the number of teeth difference from the fixed ring gear 63, and this rotation is transmitted to the winch drum 52. Therefore, the winch drum 52 can wind or extend the wire.

[0007]

However, the planetary gear 59 is in an unstable state because it is meshed with the sun gear 58, and the fixed ring gear 63 and the movable ring gear that are further meshed with the planetary gear 59. Since 64 has a difference in the number of teeth, the sun gear 58 causes the planet gear 59 to move.
When the gear rotates, the planet gear 59 may rattle. Further, since the carrier 60 is in an unstable state supported by the planet gear 59 meshed with the sun gear 58, if the rattling occurs in the planet gear 59, the carrier 6
With 0, rattling of the planetary gear 59 cannot be suppressed. Therefore, when rattling occurs in the planetary gear 59, the efficiency of meshing with the fixed ring gear 63 and the movable ring gear 64 decreases, which may reduce the rotational efficiency of the winch drum 52.

As a means for solving this, the carrier 60
Forming a cylindrical tubular portion on the disc 61b constituting
It is considered that the tubular portion is supported by the drive shaft 53 via a bearing. However, in the case of the above-described configuration, the disc 61 must be accurately centered.
There is a problem that the carrier 60 returns and rattles via b. Further, when the cylinder portion is formed on the disc 61b of the carrier 60, an extra space is required between the disc 61b and the end plate 54, which causes a problem that the winch itself becomes large.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a winch capable of preventing the rotation efficiency of a winch drum from decreasing and preventing the winch drum from increasing in size. is there.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is a sun gear in which a drive shaft is rotatably supported by a bearing portion formed in a gear case, and is rotatably driven by being meshed with the drive shaft. And a planetary gear train that is rotatably supported by a carrier that is rotatable about the same axis as the sun gear and that meshes with the sun gear, and a fixing that is fixed to the gear case side and meshes with the planetary gear train. In a winch including a ring gear and a movable ring gear that is connected to the winch drum side and meshes with the planetary gear train, the carrier has a bearing portion rotatably supported on the outer periphery of the bearing portion. Is the gist.

[0011]

When the drive shaft rotates and the sun gear rotates, the planetary gear train revolves around the sun gear. At this time, since the support portion of the carrier is supported on the outer periphery of the bearing portion of the gear case, rattling of the planetary gear train is prevented. Further, since the carrier is supported by the support portion on the outer periphery of the bearing portion formed in advance with respect to the gear case, the winch is prevented from increasing in size.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in an electric winch will be described below with reference to FIGS.

As shown in FIG. 2, an electric winch 2 is fixed by a mounting bolt 3 to a frame 1 fixed to the front part of the vehicle body. The front side is generally covered with a front bumper (not shown). A laterally-oriented cylindrical winch drum 5 is rotatably supported by bushes 6 by a gear case 3 and an end bracket 4 which form the electric winch 2. Then, the gear case 3 and the end bracket 4 are tightened and fixed by the mounting bolts 3 a that insert the frame 1.

An opening 4a is formed in the end bracket 4, and an electric motor 7 capable of forward and reverse driving is inserted through the opening 4a into the winch drum 5 in a sideways state. The main body of the electric motor 7 is supported by a motor bracket 9 fixed to the end bracket 4 by a fixing bolt 8. The drive shaft 10 of the electric motor 7 is connected to the end plate 1 of the winch drum 5.
The drive shaft 10 is rotatably supported by a bearing portion 13 formed inside the gear case 3 via a bearing 14 through the through hole 12.

A spline 15 is formed on the drive shaft 10 between the gear case 3 and the end plate 11, and a sun gear 16 is meshed with the spline 15 of the drive shaft 10. Around the sun gear 16, three planet gears 17 that mesh with the sun gear 16 are arranged.
A planetary gear train G is constituted by the planetary gears 17, and the planetary gears 17 are composed of a pair of support plates 18 constituting a carrier 18.
It is rotatably supported by a shaft 19 supported by a and 18b. The pair of support plates 18a and 18b forming the carrier 18 are held by a plurality of stepped connecting pins 20 which are inserted at regular intervals in the axial direction of the planetary gear 17.

Two fixed ring gears 21 and two movable ring gears 22 are meshed with the planet gear 17 in a juxtaposed state. Then, the fixed ring gear 21
Is fitted to the inner peripheral surface of the cylinder of the gear case 3, and is fixed to the gear case 3 by the key 23. The movable ring gear 22 is fitted to the outer peripheral surface of the cylindrical portion of the winch drum 5 that extends outwardly of the end plate 11, and is fixed to the winch drum 5 by a key 24. The fixed ring gear 21 and the movable ring gear 22 are different in the number of teeth by 1 to 3 teeth. In this embodiment, the movable ring gear 22 has one to three more teeth than the fixed ring gear 21.

Further, the support plate 1 constituting the carrier 18
A cylindrical bearing portion 25 is formed on the outer side surface of the center of 8a so as to project from the outer peripheral surface of the bearing portion 13 formed on the gear case 3 via a needle bear rig 26. There is. Therefore, the planetary gear train G is supported by the bearing portion 13 of the gear case 3 via the bearing portion 25 of the support plate 18a of the carrier 18.

Next, the operation of the electric winch constructed as above will be described. When the electric motor 7 drives to rotate the drive shaft 10 and the sun gear 16, the sun gear 1
6, the planetary gear 17, which meshes with the fixed ring gear 21 and the movable ring gear 22, respectively, rotates (rotates) about the shaft 19. Then, the planetary gear 17 rotates (revolves) around the sun gear 16 while rotating on its own axis. At this time, when the planetary gear 17 makes one revolution around the sun gear 16, that is, one revolution, the movable ring gear 22 rotates by the number of teeth difference from the fixed ring gear 21, and this rotation is transmitted to the winch drum 5.

Therefore, since the difference in the number of teeth between the fixed ring gear 21 and the movable ring gear 22 is only 1 to 3, there is a large reduction ratio (generally about 1 / third) even though the planetary gear train G has one stage. 150) can be obtained.

Incidentally, in the rotating direction of the movable ring gear 22, the number of teeth of the movable ring gear 22 is fixed.
When the number of teeth is greater than the number of teeth, the direction is the same as the revolution direction of the planetary gear 17, and when the number is less, the direction is opposite.

When the planetary gear 17 revolves around the sun gear 16 while revolving by the rotation of the drive shaft 10 and the sun gear 16, the planetary gear 17 tends to rattle. However, since the support plate 18a of the carrier 18 is supported by the outer peripheral surface of the bearing portion 13 via the support portion 25 and the needle bearing 26 and the carrier 18 is in a stable state, the rattling of the planetary gear 17 is suppressed. You can

Therefore, the support plate 18a of the carrier 18 is attached to the bearing 13 which is conventionally formed inside the gear case 3.
The planetary gear 1
The rattling due to the rotation of 7 can be suppressed. As a result, it is not necessary to accurately center the drive shaft 10, and it is possible to prevent the carrier 18 and the planet gears 17 from rattling due to poor centering. Further, since rattling of the planetary gear 17 can be suppressed, a decrease in meshing efficiency of the planetary gear 17 with the fixed ring gear 21 and the movable ring gear 22 is suppressed, and a decrease in rotational efficiency of the winch drum 5 is prevented. be able to.

Since the support plate 18a of the carrier 18 is supported on the outer peripheral surface of the bearing portion 13 of the gear case 3, a space for supporting the support plate 18b on the drive shaft 10 is provided between the support plate 18b and the end plate. Since it is not necessary to provide it between the electric winch 2 and the electric winch 11, it is possible to prevent the electric winch 2 from increasing in size.

In the present embodiment, the drive shaft 10 is rotated by the electric motor 7, but in addition to this, the drive shaft 10 is connected to the engine through a clutch, and the drive shaft 10 is rotated by turning the clutch on and off. It is also possible to configure.

Further, in this embodiment, the electric winch applied to the vehicle is embodied, but the application is not limited to the vehicle.

[0026]

As described above in detail, according to the present invention, there is an excellent effect that the rotation efficiency of the winch drum can be prevented from being lowered and the winch drum can be prevented from being increased in size.

[Brief description of drawings]

FIG. 1 is a partially enlarged cross-sectional view showing a state in which a support plate of a carrier that supports a planetary gear train is supported by an outer peripheral surface of a bearing portion in a gear case.

FIG. 2 is a sectional view of an electric winch according to the present invention.

FIG. 3 is a partially enlarged sectional view showing a state of a carrier supporting a planetary gear train in a conventional electric winch.

[Explanation of symbols]

3 ... Gear case, 5 ... Winch drum, 7 ... Electric motor, 10 ... Drive shaft, 13 ... Bearing part, 16 ... Sun gear, 1
8 ... Carrier, 21 ... Fixed ring gear, 22 ... Movable ring gear, 25 ... Bearing part, G ... Planetary gear train

Claims (1)

[Claims] 1. A sun gear, which is rotatably supported by a bearing portion formed on a gear case, is rotatably driven by being meshed with the drive shaft, and a carrier rotatable about the same axis as the sun gear. A planetary gear train that is rotatably supported and meshes with the sun gear, a fixed ring gear that is fixed to the gear case side and meshes with the planetary gear train, and the planetary gear train that is connected to the winch drum side. A winch including a movable ring gear that meshes with the winch, wherein the carrier has a support portion rotatably supported on the outer periphery of the bearing portion.