JP2504671Y2 - Transmission structure of passenger work machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a transmission structure in a riding work machine in which an engine is mounted on a front portion of a machine body.

[Conventional technology]

Generally, passenger work machines such as rice transplanters have an engine mounted in the front part of the machine body, and the power from the engine is transmitted to each part of the machine body via a transmission provided above the front axle. The engine is installed in the vehicle, and the steering shaft of the steering wheel is provided so as to penetrate the front end side of the transmission case.

[Problems to be solved by the present invention]

However, in the case where the engine is arranged in front of the transmission, the weight balance between the front and rear of the machine body is deteriorated, and the machine body is likely to head up during the work. Further, the steering shaft penetrating the front end side of the transmission has a problem that the gear case of the steering reduction mechanism connected to the lower end of the steering shaft projects below the transmission case and the ground clearance of the vehicle body becomes low.

The present invention was devised to solve the above-mentioned problems, and the engine mounted on the front of the machine can be installed on the upper part of the transmission to improve the weight balance of the machine and the steering deceleration. An object of the present invention is to provide a transmission structure for a riding work machine in which the mechanism can be compactly housed in a mission case to increase the ground clearance of the machine body.

[Means for solving the problem]

The technical means taken by the present invention to solve the above-mentioned problems is to mount an engine on the front part of the machine body and transmit the power from the engine to each part of the machine body through a transmission provided above the front axle. In the working machine, a steering shaft is provided at a rear end of the transmission case of the transmission, an engine is provided at an upper part of the transmission case, and a front axle input shaft of the transmission is provided at a rear side of the transmission case. PTO running at the lower rear of the axle
It is characterized in that a shaft is provided and a steering speed reduction mechanism connected to the steering shaft is provided below the front axle input shaft of the transmission case.

[Function of device]

Therefore, according to the present invention, the weights of the engine and the transmission arranged on the upper part of the transmission case act on the front part of the airframe at the same time to improve the front-rear weight balance of the airframe. Since the steering shaft is provided at the rear end of the transmission case and the front axle input shaft is provided at the rear of the transmission case, the steering deceleration mechanism connected to the steering shaft is located below the front axle input shaft. However, since the front axle input shaft in which the traveling PTO shaft is arranged in the lower rear part has a dead space therebelow, the steering reduction mechanism can be compactly stored by utilizing this space. Therefore, the steering deceleration mechanism does not project downward,
The ground clearance of the aircraft can be increased.

〔Example〕

Next, the structure of the present invention will be described in detail with reference to the accompanying drawings.
1 is a traveling machine of a rice transplanter exemplified as a riding work machine, and an engine 5 is mounted on the front part of a machine frame 4 having left and right front wheels 2, 2 and rear wheels 3, 3 and covers the engine 5. Behind the bonnet 6, a driving operation unit 10 having a steering wheel 7, a main speed change lever 8, an auxiliary speed change lever 9 and the like is provided. 11 is a driving seat. Further, a planting section 14 including a seedling stand 12, a float 13 and the like is mounted on the rear part of the machine body so as to be able to move up and down via a link mechanism composed of an upper link 15 and a lower link 16.

Reference numeral 17 denotes a transmission that transmits the power from the engine 5 to the traveling portion and each working portion, and the transmission 17 is located above the front axle 18.

The transmission 17 includes a transmission case 19
A front axle input shaft 20 is arranged in the rear part, and a main shaft that is linked to the engine 5 via a transmission belt 21 in front of the front axle input shaft 20.
22 are located. At a position close to the main shaft 22, an intermediate shaft 23 having a gear mechanism, a planting part drive shaft 24 and a reverse shaft 25
The rear wheel drive shaft 26 is disposed below the rear portion of the front axle input shaft 20. The planted part drive shaft 24 and the rear wheel drive shaft 26 are a planted PTO shaft 27 and a traveling PTO shaft, respectively.
It is meshed with 28. And the speed change gear 29 provided on the main shaft 22
The power is transmitted to the front axle input shaft 20 via the intermediate shaft 23 to drive the front wheels 2 and at the same time drive the rear wheel drive shafts 26 by the selective meshing by the switching.

Reference numeral 30 is a shift fork for switching the transmission gear 29, 31 is a shift shifter, and a rotation shaft 32 of the shift shifter 31 is provided on the upper surface of the mission case 19.

In addition, the engine base is on the top of the mission case 19.
The engine 5 is arranged via 33, and a steering shaft 34 having a steering hole 7 mounted therein is provided upright at the rear end of the transmission case 19. Above engine base
The rear end of the 33 is supported by the mission case 19, and the front end of the 33 is supported by the frame 35 at the front of the machine body. Reference numeral 36 is a bumper mounted on the frame 35.

And the steering shaft 34 that penetrates the mission case
A steering deceleration mechanism 37 is connected to a lower end portion of the front axle input shaft 20 at a lower position thereof. The front axle input shaft 20 has a rear wheel drive shaft 26 and a traveling gear meshing therewith.
Since the PTO shaft 28 is provided in the lower rear part, the dead space created under the front axle input shaft 20 is effectively used to store the steering reduction mechanism 37 in the compact state at the bottom rear end side of the mission case 19. Has been done. 38
Is the pitman arm and the steering wheel 7
The pitman arm 38 is operated by this operation to steer the front wheels 2. 39 is a hydraulic pump.

Further, the main shift lever 8 of the driving operation unit 10 has a lower end of a rotation fulcrum 40 supported by a steering column 41, and the shift shifter via a connecting rod 42 extending forward and downward from the rotation fulcrum 40. It is connected to the rotary shaft 32 of 31 and is shifted in each shift state in conjunction with the operation of the main shift lever 8.

In the above structure, the power from the engine 5 is transmitted through the transmission 17 to the front wheels 2, the rear wheels 3 and the planting portion 14.
The planting work can be carried out as the aircraft travels. Further, since the weight of the engine 5 arranged on the upper part of the transmission 17 and the weight of the transmission 17 act on the front part of the machine body at the same time, the front-rear weight balance of the machine body becomes good, and head up does not occur during work. Since the front part of is short, the circulatory property at the edge of the ridge can be improved and the work can be performed efficiently. Since the steering reduction mechanism 37 provided at the lower end of the steering shaft 34 can be housed in a compact state at the bottom rear end of the transmission case 19 below the front axle input shaft 20, the steering reduction mechanism 37 does not project downward. Therefore, it is possible to raise the ground height of the machine body to ensure work safety, and moreover, it is possible to easily take out the connection to the front axle 18. Further, since the front axle input shaft 20 is provided in the rear part of the mission case 19 and the gear transmission of the transmission 17 is arranged in front of the front axle input shaft 20, it is possible to further improve the front-rear balance of the body weight. .

[Effect of device]

In short, the present invention is a passenger work machine in which an engine is mounted on the front part of the machine body and the power from the engine is transmitted to each part of the machine body through a transmission provided above the front axle. By providing a steering shaft at the rear end,
The engine is installed on the upper part of the transmission case, the front axle input shaft of the above transmission is provided on the rear side of the transmission case, and the traveling PTO shaft is arranged below the rear part of the front axle input shaft and connected to the steering shaft. Since the steering deceleration mechanism is installed under the front axle input shaft of the mission case, the weight of the engine and the transmission installed in the upper part of the mission case act on the front part of the aircraft at the same time.
The weight balance between the front and rear of the machine is improved, and work can be performed smoothly. Since the steering shaft is installed at the rear end of the transmission case, the steering speed reduction mechanism connected to the steering shaft can be installed under the front axle input shaft, and the front axle input shaft has the running PTO shaft at the rear. Since it is arranged below, the dead space formed below the front axle input shaft can be effectively used to compactly store the steering reduction mechanism at the bottom rear end side of the transmission case. Therefore, the steering deceleration mechanism does not project downward, the ground height of the machine body becomes high, and work safety can be achieved, and the steering deceleration mechanism can be easily taken out from the front axle.

Further, since the front axle input shaft is provided on the rear side of the mission case, the gear transmission in the mission case is located in the front side, so that the weight balance between the front and the rear can be further improved.

[Brief description of drawings]

1 is an overall side view of a passenger work machine, and FIG. 2 is an enlarged cross-sectional view of the transmission according to the present invention. In the figure, 5 ... Engine, 17 ... Transmission, 18
... front axle, 19 ... mission case, 20 ...
… Front axle input shaft, 28 …… Running PTO shaft, 34 ……
Steering shaft, 37 ... Steering deceleration mechanism.

Claims (1)

(57) [Scope of utility model registration request] 1. A passenger working machine in which an engine is mounted on a front portion of a machine body, and power from the engine is transmitted to various parts of the machine body via a transmission provided above a front axle, and a rear end of a transmission case of the transmission. The steering shaft is installed in the section, the engine is installed on the upper part of the transmission case, the front axle input shaft of the transmission is installed on the rear side of the transmission case, and the traveling PTO shaft is installed below the rear part of the front axle input shaft. The steering deceleration mechanism connected to the steering shaft is provided below the front axle input shaft of the transmission case, and the transmission structure of the riding work machine is characterized.