JPS5844895B2 - Douriyokudentatsusouchini Okeru Kaitenjikurenketsukouzo - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a connection structure for a rotating shaft in a rice transplanter, for example, when transmitting the output of an engine installed at the front of the machine to a planting mission case at the rear of the machine via a mission case. Regarding the improvement of

In recent years, in rice transplanters, the rotating shaft is formed hollow to reduce weight, and is configured to transmit power by fitting and connecting to a driving shaft and a passive shaft provided protruding from both transmission cases. In many cases, the rotating shaft is covered with a transmission case as a protective cover, and this transmission case is also fixed between the two transmission cases.

In this case, the drive shaft and passive shaft of the transmission case are generally installed protruding from the case, so the length of the rotating shaft connected between the two drive shafts is the length of the transmission case installed between the two cases. It is shorter than Sa.

Therefore, when assembling the transmission case to be connected between both transmission cases while the transmission case is externally attached to the rotating shaft, one end of the rotation shaft is fitted to the protruding shaft of one side of the transmission case, and then one end of the transmission case is attached to the transmission case. If it is stuck, the other end of the rotating shaft will enter inside the other end of the transmission case, making it difficult to fit into the drive shaft of another transmission case.

Therefore, conventionally, as shown in FIG. 6, a spring 3 is mounted on the passive shaft 2 protruding from the one-sided transmission case 1, and one end of the rotary shaft 4 is attached to the protruding passive shaft 2 of the one-sided transmission case 1. When they are fitted and the transmission case 5 is fixed, one end of the rotating shaft 4 is pressed against the spring 3 so that the other end protrudes from the other end of the transmission case 5. In this state, the protruding drive shaft 7 of another transmission case 6 is fitted onto the rotating shaft 4 to simplify assembly.

According to such a structure, the spring 3 for causing the rotating shaft 4 to protrude from the transmission case 5 is required.

Further, the rotary shaft 4 is connected to the driving shaft 7 and the driven shaft 2 by spline fitting.

Although spline fitting has little backlash in the rotational direction and can easily transmit relatively smooth rotation, it has the disadvantage that it requires high precision and complicated manufacturing and is expensive.

Therefore, instead of the spline fitting, a bottom stand type with a square shaft and a square tube may be considered, but in this case, the manufacturing process is easy, but the disadvantage is that the fitting part becomes stiff. In order to eliminate backlash, extremely high-precision machining is required, which has the disadvantage of being no different from spline machining.

The technical problem of the present invention is to employ a fitting structure of a square shaft and a square tube that is easy to manufacture and process, while reducing looseness at the fitting point between the square shaft and the square tube to achieve smooth rotational drive. The purpose is to make it possible to transmit force as much as possible, and to make it easy to assemble by omitting a spring and reducing the number of parts.

The characteristic configuration of the rotary shaft connection structure in the power transmission device of the present invention, which was taken to solve the above problems, is that the drive shaft protrudes from the mission case connected to the engine, and the passive shaft protrudes from the mission case. facing each other, both ends of the pipe-shaped connecting shaft are fitted onto the drive shaft and the passive shaft, respectively, to interlock and connect the drive shaft and the passive shaft, and a transmission case is provided around the outer periphery of the pipe-shaped connecting shaft. In a rotating shaft connection structure in a power transmission device that connects the mission case to the engine, at least one of the drive shaft and the passive shaft is formed into a square shaft shape, and the transmission case is connected to the engine. The end of the pipe-like connecting shaft on the side that fits into the shaft-like shaft is formed into a square tube shape, and further,
The fitting surface of the rectangular tube-shaped portion of the pipe-like connecting shaft is in contact with the shaft end of the rectangular shaft in a fitted state that is shorter than a predetermined fitted connected state; Another advantage is that a small protrusion is provided that can be plastically deformed by a forceful fitting action caused by a pushing force greater than that in the abutting state, and this configuration provides the following effects.

That is, since the pipe-shaped connecting shaft is made to protrude from the transmission case using a small protrusion, the conventional spring can be made unnecessary.

Since this small protrusion is plastically deformed after fitting and connection, it is possible to prevent the pipe-shaped connecting shaft from becoming loose on the small protrusion side.

In this way, we use the plastic deformation of the protrusion to eliminate looseness, so we adopt a fitting structure using a square shaft with play and a square tube to connect the pipe-shaped connecting shaft and the shaft protruding from the transmission case. This has made it easier to manufacture and process shaft connections.

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

Fig. 1 shows a rice transplanter, in which an engine 8 is arranged at the front of the machine, a planting section 11 consisting of a seedling stand 9, a planting claw 10, etc. is arranged at the rear of the machine, and the machine is supported by a float 12. It is configured to run on propulsion wheels 13 while being stably supported in a wet field or the like.

The driving of each of these devices is as shown in Fig. 2.
After the output of the engine 8 is transmitted into the transmission case 6, a part of the output is transmitted to the propulsion wheels 13 via the transmission frame 14, and a part is transmitted to the pipe-shaped connecting shaft housed inside the transmission case 5. However, the planting is transmitted to the transmission case 1 via a power transmission rotating shaft 4 (described later), and the planting is configured to drive the planting section 11.

Further, the rotating shaft 4 is constituted by a cylindrical hollow pipe, and a protruding shaft 2 which is a passive shaft having the same axis X as the rotating shaft 4 and a driving shaft are protruded from both the mission cases 1 and 6. The protruding shafts 7, which are shafts, are respectively protruded.

7, the ends of both ends of the rotary shaft 4 and the two protruding shafts 2°7, which are composed of solid shafts, are square fitting and connecting different diameter portions 4', 2.
Alternatively, one of the transmission cases 1 and 6 is configured to be spline-fitted with different diameter portions 4'' and 7'', and both transmission cases 1 and 6 are connected together by the rotating shaft 4.

In the present invention, when the rotary shaft 4 is fitted and connected between the protruding shafts 2 and 7, the protruding shaft 7 side is configured as a spline fitting part, and the protruding shaft 2 side is configured as a square fitting part.

The different diameter portion 4' of the rotating shaft 4 on the side of the square fitting portion and the planting are connected between the fitting surfaces S1 and 82 of the different diameter portion 2' of the shaft 2 protruding from the mission case 1. A small protrusion 15 that abuts the end of the protruding rotating shaft 2 in the fitted state with a length shorter than the fitting length in the axial center X direction of the rotating shaft 4 is attached to the fitting surface S1 of the rotating shaft 4. Furthermore, the small protrusions 15 are configured to be brought into contact and deformed by further forcible fitting action from the abutting state of the protruding shaft 2.

According to the above configuration, in order to mount the rotating shaft 4 and the transmission case 5 between the two mission cases 1 and 6, the different diameter portion 4' of the rotating shaft 4 having the protrusion 15... to the different diameter portion 2' of the protruding shaft 2, as shown in FIG.
When the transmission case 5 is mounted on the rotating shaft 4 and fixed to the transmission case 1 in this state, the different diameter portion of the other end of the rotating shaft 4 4'' is in a state of protruding from the transmission case 5.

Then, in this protruding state, the different diameter portion 4" of the rotating shaft 4
is externally fitted onto the different diameter portion 7'' of the protruding shaft 7 of the transmission case 6.

Furthermore, the side of the transmission case 6 is the transmission case 5.
When the rotary shaft 4 is pressed and moved to the position where it contacts the other end, the rotating shaft 4 is pressed by the protruding shaft 7 of the transmission case 6 and moves, and the protrusions 15 of the different diameter portion 4' As shown in FIG. 4, the rotary shaft 4 is moved to a desired position while being deformed by contacting the different diameter portion 2' of the protruding shaft 2, and the connection and assembly are performed.

In this connected state, as shown in FIG. Prevents wobbling due to the gap in S2.

Further, the rotating shaft 4 is connected to the protruding shaft 2 by the protrusion 15...
Since the rotary shaft 4 is reliably positioned relative to the rotary shaft 4, the rotating shaft 4 is reliably positioned at the desired position during disassembly and inspection.

In the embodiment, the mating surface S1 has protrusions 15...
... may be formed on the fitting surface S2.

In the embodiment, the protrusions 15 are made to appear by being deformed so as to protrude from the outer surface of the different diameter portion 4' using a punch or the like.

In addition, in the embodiment, the fitting different diameter portion 4' of the rotating shaft 4,
4'' is configured by attaching a separate member to the rotating shaft 4, but it is also possible to configure the rotating shaft 4 itself to have a different diameter with respect to the shafts 2 and 7.

[Brief explanation of drawings]

The drawings show an embodiment of a rotating shaft connection structure in a power transmission device according to the present invention, and FIG. 1 is an overall side view showing a rice transplanter;
Fig. 2 is a schematic plan view, Fig. 3 is a sectional view of the main part, Fig. 4 is an enlarged sectional view of the main part, Fig. 5 is a sectional view taken along the line ■-■ of Fig. 4, FIG. 6 is a sectional view of a main part of a conventional example. 1.6...Mission case, 2...
Passive shaft, 4... Pipe-shaped connecting shaft, 5...
・Transmission case, 7... Drive shaft, 15...
・Small protrusion, Sl, S2...Mating surface.

Claims (1)

[Claims] 1. A drive shaft 7 protruding from a mission case 6 connected to the engine and a passive shaft 2 protruding from a transmission case 1 are placed opposite to each other, and both ends of a pipe-shaped connecting shaft 4 are connected to the drive shaft 7 and the passive shaft 2. A transmission case 5 is provided on the outer periphery of the pipe-like connecting shaft 4, and a transmission case 6 connected to the engine and a transmission case 6 are connected to the engine. 1, at least one of the driving shaft 7 and the passive shaft 2 is formed into a square shaft shape, and the shaft (7 or 2) is fitted into the square shaft shape. The end of the pipe-like connecting shaft 4 on the mating side is structured into a square tube shape,
Furthermore, the fitting surface S1 of the rectangular tube-shaped portion of the pipe-like connecting shaft 4 is provided with the rectangular shaft-shaped shaft (7 or 2 ), and can be plastically deformed by a forced fitting action caused by a pushing force greater than that in the abutting state.
A rotating shaft connection structure in a power transmission device, characterized in that it is provided with...