JPH039149A - Running transmission device for tractor - Google Patents

Abstract

PURPOSE:To abolish a hydraulic mechanism so as to eliminate the leakage of oil by providing a transmitting shaft behind a driven shaft, forward and reverse gears and forward and reverse clutches in the front part on the transmitting shaft and an operating mechanism for interrupting both the clutches. CONSTITUTION:A driven shaft 3 in a prime mover side and a transmitting shaft 5, for transmission to a speed change mechanism, behind the driven shaft are provided. Forward and reverse gears 6, 7 are rotatably provided before the transmitting shaft 5, and forward and reverse clutches 8, 9 are provided between both the gears 6, 7. Rotation of the driven shaft 3 is transmitted to the transmitting shaft 5 from gears 21, 25, forward gear 6 and the forward clutch 8 or from the gears 21, 25, transmitting shaft 27, gears 26, 31, reverse gear 7 and the reverse clutch 9. Action of this selection is operated by a mechanically operating mechanism 10. Accordingly, structure is simplified and no leakage of oil is generated by eliminating a hydraulic mechanism.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a traveling transmission device for a tractor.

Prior Art and Problems to be Solved by the Invention A variable speed transmission mechanism is installed between a main clutch that connects and disconnects transmission from the prime mover and a variable speed transmission mechanism that changes speed and transmits the transmission to the traveling shaft. Before switching to, reverse switching mechanism,
In a tractor travel transmission device equipped with a hydraulic mechanism that switches this switching mechanism with hydraulic pressure, this hydraulic mechanism is easy to operate, but requires a hydraulic pump, a hydraulic cylinder, an oil passage, etc. However, although there is a risk that the configuration will be complicated and the cost will be high, and some oil leaks from these hydraulic circuits, cases with internal forward/reverse switching mechanisms may be used for long periods of time. There is a risk that oil may fill up inside the case, causing problems with the transmission system, or causing oil to leak outside the case.

When the operating mechanism (1) of the invention is operated to the forward side, the forward clutch (8) becomes the engaged side, and the driven shaft (3) of the main clutch (2), which is transmitted from the prime mover (1), The rotation in the forward direction is transmitted to the transmission mechanism (4) through the gear, the forward gear (6), the forward clutch (8), and the transmission shaft (5), and the operation mechanism (1) is switched to the reverse side. and reverse clutch (9)
) is on the entry side, the driven shaft (3) is a gear, a reverse gear (
7), the rotation in the reverse direction is transmitted to the speed change transmission mechanism (4) via the reverse clutch (9) and the transmission shaft (5).

Effects of the Invention As mentioned above, instead of using a hydraulic mechanism to switch between the forward and reverse switching mechanisms, a mechanical operating mechanism (1) is provided, which simplifies the configuration and is expected to reduce costs. In addition, there is no risk of the case being filled with oil and causing problems with the transmission system, or of oil leaking outside the case.

Embodiment In addition, when rotating, an output shaft (
Equipped with a prime mover (1) having 11, this prime mover (1)
A clutch case Q41 containing a main clutch (2) that connects and disconnects power transmission from the output shaft (13) is connected to the rear end of the clutch case Q41, and a forward/reverse switching mechanism is connected to the rear end of the clutch case Q41. Intermediate cases to be installed (one is connected to the other, and the rear end of one of the intermediate cases is equipped with a speed change transmission case the inside of which is a speed change transmission mechanism (4) which is transmitted from the forward/reverse switching mechanism. Combined, and furthermore, this transmission transmission case +I
At the rear end of the GI, there is provided a transmission case (1B) in which a pair of left and right rear wheels (1η) are mounted and a transmission mechanism for transmitting power from the speed change transmission mechanism (4) to these rear wheels is installed.

The bearing 120 provided on the rear wall (18) (9) of the clutch case (141) has a rear part of the driven shaft (3) of the main clutch (2), which has an input gear (c!1) at the rear end. Further, an inner case Q3 is provided on the rear wall of the clutch case (14), which is located inside the intermediate case (19) and houses the forward/reverse switching mechanism.

Both front and rear bearings 121 are provided on the rear wall (one lower part) of the clutch case 04 and the rear wall (end) of the inner case (two).
0Q7$1 is the gear c! that meshes with the input gear 1211. The gear 12e located behind this gear I29
and supports a transmission shaft (2) that transmits power to the power take-off mechanism, and both rear walls (18
)(9)(23) Both front and rear bearings 12I C
21 includes a transmission shaft (
5).

Further, a forward gear (6) that meshes with the gear (C) is rotatably provided on the front part of the transmission shaft (5), and a forward gear (6) that meshes with the gear (C) is rotatably provided on the rear surface of the forward gear (6). Drive friction plate 12 of clutch (8)! e (2!) is integrally provided with a support part 00 that is slidably supported and unrotatably supported, and the transmission shaft (5!
) A reverse gear (7) that meshes with the gear C2e via an intermediate gear OD is rotatably provided behind the upper forward gear (6), and the front surface of the reverse gear (7) is equipped with: A support part (support) that supports the drive friction plates (to) (c) of the reverse clutch (9) in a slidable and non-rotatable manner is integrally provided.

Between the two gears (61 (6) and (7) on the transmission shaft (5), there is a cylindrical part C33 that covers the outer periphery of the drive friction plate (to) (to)... and this cylindrical part (to). The boss part 09 of the clutch exterior body having a supporting intermediate wall (b) is coupled to the inner circumferential surface of this cylindrical part o3, and the driven friction plate CIQ (to) of the forward clutch (8) is connected to the boss part 09 of the clutch exterior body having a supporting intermediate wall (b). . . . and the driven friction plate (to) OQ of the reverse clutch (9).
2m (to)... Rear side and each friction plate for backward movement I21 (to)
A plurality of connecting bolts G8) (9) (to) are provided between the outer periphery of both pressure plates (to) provided on the front side of ... to connect these two pressure plates (to). , the advancement pressure plate (
5) and the intermediate wall (b) of the exterior body is provided with a spring (a) for pressurizing the advancing pressurizing plate device OQ.

A sliding hole @1) provided in the shaft center from the front end surface of the transmission shaft (5) to the position of the reverse friction clutch 21C3Q... is provided with a sliding hole @1) on the front side of the reverse pressure plate (to). An operating mechanism (IIll) sliding rod C3 is provided which has a pin 0δ located there and presses this pressure plate (to) by sliding backwards, and an operating arm 0 is provided on the front side of the clutch case Q4 + rear wall tn. A cam mechanism is provided that can slide the sliding rod trout 1 backward by a rotational operation.

In addition, (1) is a sliding body that turns the main clutch (2) to the disengaged side by sliding forward, and (1) is an arm that rotates and slides (1) on the sliding body.

Next, the effect will be explained. By the rotation of the operation arm 0, when the reverse pressure plate (to) is pressed rearward via the cam mechanism), the sliding rod C3 and the pin (rotation), each of the reverse friction plates t21 GG ... is pressurized and the reverse clutch (9) moves to the input side, and the forward pressure plate - moves backward against the spring (a) via the connecting bolt (to) (to). , each forward friction plate 210G...
The pressure is removed and the forward clutch (8) becomes disengaged.

Conversely, if you move the pin 6 forward, the spring (t)
, each friction plate for advancement (
2! C3G... is pressurized and the forward clutch (8)
becomes the entry side, and the reverse pressure plate (to) moves forward via the connecting bolt @ (to), so the reverse pressure plate 12
The pressure of I C3G... is removed and the reverse clutch (9
) becomes the incisal side.

When the forward clutch (8) is on the input side, the input gear c! is transmitted via the output shaft (131 to the main clutch (2) to the driven shaft 3) of the prime mover (1). 1) is gear, forward gear (6), support part 0[D and forward pressure plate 12mC5
・In addition, the cylindrical portion of the clutch exterior body and the intermediate wall (b),
The transmission mechanism (4) is connected to the transmission mechanism (4) via the boss OQ and the transmission shaft (5).
), and the power is transmitted from the variable speed transmission mechanism (4) to the rear wheel (1 force (■) in forward rotation via the transmission mechanism inside the transmission case 0υ.

In addition, when the reverse clutch (9) is on the input side, the input gear C'11 transmitted to the driven shaft (3) is gear -, transmission shaft (5),
Transmission is transmitted from the reverse clutch (9) to the transmission shaft (5) via the gear (A) 0υ and the reverse gear (7) in the opposite rotation to the forward rotation.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, with FIG. 1 being a sectional side view and FIG. 2 being a side view of the entire device. In the figure, code (1) is the prime mover, (2) is the main clutch, and (3) is the prime mover.
) is the driven shaft, (4) is the variable speed transmission mechanism, (5) is the transmission shaft,
(6) is a forward gear, (7) is a reverse gear, and (8) is a forward clutch. (9) indicates the reverse clutch, and +In indicates the operating mechanism.

Claims (1)

[Claims] Behind the driven shaft (3) of the main clutch (2) that connects and disconnects power from the prime mover (1), there is a transmission shaft (5) that transmits power to the rear speed change transmission mechanism (4) along this driven shaft (3). A forward gear (6) is provided on the front portion of the transmission shaft (5) and is transmitted from the driven shaft (3) through a gear in one direction.
A reverse gear (7) which is transmitted from the driven shaft (3) through gears in the opposite direction is rotatably provided, and between these two gears (6) and (7), the forward gear A forward clutch (8) that connects and disconnects power transmission from the gear (6) to the transmission shaft (5), and a reverse clutch (9) that connects and disconnects power transmission from the reverse gear (7) to the transmission shaft (5). ), and the transmission shaft (5) is connected from these clutches (8) and (9).
A traveling transmission device for a tractor, which is provided with an operating mechanism (10) that can alternately engage and disengage both clutches (8) and (9).