JPH0560202U - Transmission in agricultural machinery - Google Patents

Abstract

(57) [Summary] [Purpose] To make a transmission device that continuously performs a series of operations from forward / reverse rotation switching to gear shifting steplessly and efficiently. [Structure] In a structure in which a transmission is interposed between the input shaft (20) and the output shaft (25), the input shaft (20) is provided to the sun gear (21) of the planetary gear mechanism (18), and the sun gear ( 21) is connected to the planetary gear (22) which is meshed with the output shaft (25), and the ring gear (27) which is meshed with the planetary gear (22) is meshed with the variable speed output gear (28) of the continuously variable transmission mechanism (19). Then, the ring gear (2
The forward / reverse switching of the output shaft (25) and the rotational shifting are performed by the rotational shifting operation of 7).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a speed change device for an agricultural work machine such as a rice transplanter, which switches forward and backward movements of a machine body and shifts a traveling speed.

[0002]

[Prior Art]

 In this type of agricultural work machine, when the traveling speed is changed by a mechanical means using a gear, the forward / backward switching is also performed by the mechanical means using a gear.

[0003]

[Problems to be solved by the device]

 However, in the case of such a shift change means, not only is the structure and operation labor complicated because all of the shift and forward / reverse shifts are carried out by a combination of gears, but also a series of these shifts is stepless. There was a problem that I could not do it.

[0004]

[Means for Solving the Problems]

 Therefore, according to the present invention, in a structure in which a transmission is interposed between the input shaft and the output shaft, the input shaft is connected to the sun gear of the planetary gear mechanism, and the output shaft is connected to the planetary gear that meshes with the sun gear. A planetary gear is obtained by engaging the transmission output gear of the continuously variable transmission mechanism with the ring gear that meshes with the planetary gear, and performing forward / reverse switching and rotational transmission of the output shaft by rotationally shifting the ring gear by the continuously variable transmission mechanism. It is a simple constituent means that combines a mechanism and a continuously variable transmission mechanism, which makes it possible to perform all the gear shifting steplessly by switching between forward and reverse movements, and to efficiently perform gear transmission without loss.

[0005]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view of a transmission, and FIG. 2 is an overall side view of a riding rice transplanter, in which (1) is a riding rice transplanter on which an operator rides, and a body frame (3) equipped with an engine (2). ) The rear end is connected to the mission case (4), and the front wheels (6) for traveling the paddy field are supported on both front sides of the mission case (4) through the axle case (5), and the mission case (4) The rear wheels (8) for traveling paddy fields are supported on both sides of the rear through the transmission case (7), and the driver's seat (10) is mounted on the vehicle body cover (9) that covers the transmission case (7) and the like. The steering handle (12) is attached to the rear of the bonnet (11) that covers the engine (2), etc., while the seedling stand (14) and planting claws (15) are attached to the rear of the fuselage via a three-point link mechanism (13). Lifting and lowering planting part (16) with The front and rear wheels (6) and (8) are driven to move and moved at the same time, and at the same time, one seedling worth of seedlings is slid from the seedling mounting table (14) left and right by the planting claws (15). It is configured to take out and continuously perform seedling planting work.

As shown in FIGS. 1 and 3, the transmission (17) provided in the mission case (4) is configured by combining a planetary gear mechanism (18) and a belt continuously variable transmission mechanism (19). Then, a sun gear (21) fixedly mounted on the speed-change input shaft (20) to be interlocked with the output shaft (2a) of the engine (2) and three planetary gears (22) meshing with the sun gear (21) are provided. A planetary carrier (26) for rotatably supporting via a gear shaft (23) and connecting a transmission output shaft (25) to the axles (24) of the front and rear wheels (6), (8), and inner and outer gears (27a). ) (27b) and the planetary gear mechanism (18) is provided with a ring gear (27) for meshing the inner gear (27a) with each planetary gear (22), while the outer gear (27b) of the ring gear (27) is provided. ) Variable output gear (28), and continuously variable transmission stretched between the gear shaft (29) of the gear (28) and the input shaft (20) via the continuously variable V pulleys (30) (31). The belt (32) and a speed change motor (35) for variably adjusting the speed change ratio of the V pulleys (30) (31) to a rotating screw shaft (33) via a pulley movable arm (34). The continuously variable transmission mechanism (19) is provided, and when the carrier (26) and the output shaft (25) are rotated by the transmission force from the input shaft (20), the ring gear is provided by the output gear (28) of the continuously variable transmission mechanism (19). By adjusting the rotation of (27) appropriately, the output shaft (25) can be continuously changed in speed and can be switched between forward and reverse rotation. It is configured so that the vehicle speed can be changed.

As shown in FIG. 4, a disk-shaped member is formed between the left and right front wheels (6) on the side opposite to the axle case (5) and the rim (37) so as to cover the outside of the spokes (38). This wheel disc (39) can be mounted, and the boss mounting portion (39a) at the center of the disc (39) is bulged outward in a convex shape, and the mounting portion (39a) is bossed (36a). ) It is detachably fixed to the outer end face via a set bolt (40), and the flat outer face (39b) on the outer diameter side of the disc (39) is dimensioned from the maximum outer edge of the tire lug (41) of the front wheel (6). (t ₁ ) It is installed in a state that it is recessed inward, so that the wheel disc (39) of the front wheel (6) directly touches the soil and cuts the paddy field when the aircraft goes straight, eliminating the wheel disc ( 39) To reduce the peeling and damage of the painted surface. It is configured to improve durability.

As shown in FIG. 5, the boss mounting portion (39a) of the wheel disc (39) is also formed in a substantially flat shape, and the entire disc (39) is dimensioned inward from the outer edge of the tire lug (41). t ₂ ) The same effect can be obtained even in the depressed state, and the service life can be improved.

The present embodiment is configured as described above, and a series of operations for switching the forward / backward movement of the body and gear shifting are performed by shifting the rotation of the ring gear (27). As shown in 3, when the carrier (26) and the output shaft (25) rotate in the right direction of the solid line arrow when viewed from the output shaft (25) side, when the aircraft is in the forward traveling state,

(1) The output gear (in the state where the peripheral speed (U ₂ ) of the inner gear (27 a) in the ring gear (27) is made slower (U ₂ <U ₁ ) than the peripheral speed (U ₁ ) of the sun gear (21). When adjusted in 28), each planetary gear (22) revolves to the right, that is, the carrier (26) and the output shaft (25) rotate to the right as indicated by the solid line arrow, so that gear shifting is performed in the forward traveling state of the airframe.

[0011] (2) Further, a ring gear (27) the peripheral speed of the inner gear (27a) of the (U _2), to adjust the sun gear (21) the peripheral speed of the (U ₁₎ to the same (U ₂ = U ₁₎ The planetary gears (22) rotate about their own axes, and the carrier (26) and the output shaft (25) stop rotating and are maintained in a neutral state.

(3) Next, the peripheral speed (U ₂ ) of the inner gear (27a) of the ring gear (27) is set to be higher than the peripheral speed (U ₁ ) of the sun gear (21) (U ₂ > U ₁ ). When adjusted, each planetary gear (22) revolves to the left, that is, the carrier (26) and the output shaft (25) rotate to the left as indicated by the broken line arrow, so that gear shifting is performed in the reverse state of the aircraft.

As described above, by operating the variable speed motor (35) of the continuously variable transmission mechanism (19) to adjust the rotational peripheral speed (U ₂ ) of the ring gear (27), a series of forward-neutral-reverse The speed change is easily performed steplessly, and the driving force is transmitted by transmission of the gears (21) and (22) in the planetary gear mechanism (18), so that there is no power loss and the efficiency is excellent. ..

Although the rice transplanter has been described as an example in the above-described embodiment, it may be another agricultural work machine or may be used for shifting the drive unit other than traveling.

[0015]

[Effect of the device]

 As is apparent from the above embodiments, the present invention has a structure in which a transmission is interposed between the input shaft (20) and the output shaft (25), and the sun gear (21) of the planetary gear mechanism (18). Is connected to the input shaft (20) and the planetary gear (22) that meshes with the sun gear (21) is connected to the output shaft (25), and the ring gear (27) that meshes with the planetary gear (22) is continuously variable. The transmission output gear (28) of the mechanism (19) is meshed, and the output shaft (25) is switched forward / reversely and rotationally by the rotational transmission operation of the ring gear (27) by the continuously variable transmission mechanism (19). Therefore, it is a simple means by combining the planetary gear mechanism (18) and the continuously variable transmission mechanism (19). Without loss Rate may go, a marked effect like can be the transmission very efficient to what Usage convenient.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a transmission.

FIG. 2 is an overall side view of a riding rice transplanter.

FIG. 3 is an explanatory diagram of a transmission device.

FIG. 4 is an explanatory diagram of a wheel disc.

FIG. 5 is an explanatory view showing another modified structure example of the wheel disc.

[Explanation of symbols]

 (18) Planetary gear mechanism (19) Continuously variable transmission mechanism (20) Input shaft (21) Sun gear (22) Planetary gear (25) Output shaft (27) Ring gear (28) Variable output gear

Claims (1)

[Scope of utility model registration request] 1. A structure in which a transmission is interposed between an input shaft and an output shaft, wherein an input shaft is connected to a sun gear of a planetary gear mechanism, and an output shaft is connected to a planetary gear meshing with the sun gear. A ring gear that meshes with a planetary gear is meshed with a variable speed output gear of a continuously variable transmission mechanism, and forward / reverse switching of an output shaft and rotational speed shifting are performed by rotationally shifting operation of the ring gear by the continuously variable transmission mechanism. A gearbox for farm work machines.