JPS6342196Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a forward/reverse rotation transmission that changes the direction of rotation and also changes the speed of rotation in an orthogonal transmission.

Conventionally, orthogonal transmissions transmit rotation in the direction of orthogonal axes using orthogonal bevel gears, and then provide a speed change shaft and two pairs of spur gears to perform gear changes. Therefore, as the device becomes larger, the number of parts increases.

Therefore, in the present invention, on one of the orthogonal axes,
A slide gear having large and small bevel gears facing inward at a predetermined interval is arranged so as to be slidable, and a large bevel gear and a small bevel gear are fixed to the tip of the other shaft. To provide a forward/reverse rotation transmission which eliminates the above-mentioned drawbacks by being constructed so that a large bevel gear can mesh with a large bevel gear and a small bevel gear can mesh with a small bevel gear based on sliding. The purpose is to

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the orthogonal forward/reverse rotation transmission 1 has a gear case 2, and a drive shaft 3 extends through the case 2 and is rotatably disposed by a bearing 5. A driven shaft 6 is rotatably disposed by a bearing 5 so as to be orthogonal to the drive shaft 3. A spline 3a is formed on the drive shaft 3 at a portion protruding from the bearing 5. A slide gear 7 is slidably supported on the spline 3a, and an input sprocket is provided at the tip of the spline 3a. 9 is fixed. Slide gear 7
has large and small bevel gears 7a and 7b facing inward at a predetermined interval, and a holder 11 is rotatably connected to the slide gear 7 via a bearing 10. Further, the holder 11 is in sliding contact with the inner cylindrical wall of the gear case 2, and the case 2 has a sliding lock having two locking portions a and b on the left and right sides, as shown in detail in FIG. Two upper and lower holes 12 are bored, and operating levers 13, 13 are fastened to the holder 11 by passing through these locking holes 12, and furthermore, the levers 13 are connected to the locking portion a of the locking hole 12. , b, and is biased by a locking fitting 15 made of a plate spring. On the other hand, a large bevel gear 17a and a small bevel gear 17b are fixed to the driven shaft 6 via a key 16.
can mesh with the large bevel gear 7a of the slide gear, and the small bevel gear 17b can mesh with the small bevel gear 7b, respectively.

Since this embodiment has the above configuration, the drive shaft 3 is rotated in a predetermined direction by input from the sprocket 9, and the slide gear 7 consisting of large and small bevel gears 7a and 7b is further rotated in the same direction via the spline 3a. It's rotating. As shown in the figure, when the lever 13 is held in the locking part a of the locking hole 12, the small bevel gear 7a of the slide gear 7 meshes with the small bevel gear 17b of the driven shaft 6, and the drive shaft The rotation of No. 3 is transmitted as rotation in a predetermined direction to the orthogonal driven shaft 6 based on the meshing reduction ratio (for example, 1:1) between the small bevel gears 7b and 17b. At this time, a thrust load due to the meshing of the bevel gears acts on the slide gear 7, but this thrust load is transmitted to the holder 11 via the bearing 10, and further via the lever 13 to the locking portion of the locking hole 12. accepted by a. In addition, when the lever 13 is operated against the locking metal fitting 15 and moved and held in the other locking part b of the locking hole, the holder 1
1, the slide gear 7 slides, and its large bevel gear 7a meshes with the large bevel gear 17a of the driven shaft 6. As a result, the rotation of the drive shaft 3 is controlled by the large bevel gear 7.
The meshing reduction ratio between a and 17a (for example, 1:
0.7, the rotation is transmitted to the orthogonal driven shaft 6 in the opposite direction. In addition, based on the operation of the lever 13, the holder 11 is guided by the inner cylinder wall of the gear case 2, and the slide gear 7 can be slidly operated without rotating by the bearing 10, so a shifter etc. is not required, and the holder 11 can be operated reliably and easily. can be operated on. Furthermore, the lever locking portion a of the locking hole 12,
If b is placed in the rotational direction of the drive shaft 3, it is possible to prevent the lever 13 from coming off from the locking portions a and b due to rotational force.

As explained above, according to the present invention, the slide gear 7 having the large and small bevel gears 7a and 7b facing inward from each other at a predetermined interval is slid on one of the orthogonal shafts 3 and 6. A large bevel gear 17a and a small bevel gear 17 are provided at the tip of the other shaft 6.
b is fixed, and based on the sliding of the slide gear 7, the large bevel gear 17a meshes with the large bevel gear 7a, and the small bevel gear 17b meshes with the small bevel gear 7b, so the number of parts is reduced. The number of parts is significantly reduced, and the structure can be made lightweight and compact, and operation is extremely simple, as it is sufficient to simply slide the slide gear 7. In particular, the forward/reverse rotation transmission device 1 of the present invention
This requires light weight and compactness, and is ideal for use in running light-load management machines, rice transplanters, etc.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a forward/reverse rotation transmission according to the present invention, and FIG. 2 is a plan view of a locking hole portion thereof. 1... (orthogonal) forward/reverse rotation transmission, 3... one shaft (drive shaft), 6... other shaft (driven shaft), 7...
...Slide gear, 7a...Large bevel gear, 7b...Small bevel gear, 17a...Large bevel gear, 17b...Small bevel gear.

Claims (1)

[Scope of utility model registration request] A slide gear having large and small bevel gears facing inward from each other at a predetermined interval is slidably disposed on one of the orthogonal axes, and a large and small bevel gear is disposed at the tip of the other shaft. A forward/reverse rotation transmission device in which a bevel gear is fixed, and a large bevel gear can mesh with a large bevel gear, and a small bevel gear can mesh with a small bevel gear, based on the sliding movement of a slide gear.