JPS6318257Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transmission structure in which a transmission shaft is supported in a transmission case connected to an end face of an engine with its end facing toward the engine.

In such a transmission structure, conventionally, a wall-like body is integrally formed on the engine side of the transmission case, and the wall-like body is provided with a cylindrical part that fits and supports the engine-side end of the transmission shaft. But in this case,
There is a disadvantage that manufacturing the transmission case is complicated, and
When assembling a transmission mechanism such as gears into a transmission case, the opening at the top of the case (generally, the top of the transmission case has a lid with a gear shift lever for operating the transmission gear, etc.). Since the lid is attached, an opening for attaching the lid is formed.), and then fit the gears one after another onto the transmission shaft inserted from one end of the transmission case. After installing the gear, insert the transmission shaft into the case wall on the other end side and assemble the transmission mechanism inside the transmission case, or move the transmission case in a direction perpendicular to the axial direction of the transmission shaft. Split into two parts, and with the gear group assembled on the transmission shaft, assemble it into one transmission case, align the hole in the other case with the transmission shaft, and assemble the cases together. According to the former method, it is troublesome to assemble the transmission mechanism inside the case.
According to the latter method, unless the transmission shafts are securely supported by one case, it is difficult to align the multiple transmission shafts with the holes, making it difficult to assemble the cases. There was room for.

The present invention was devised in view of the above circumstances, and its purpose is to simplify the configuration through simple modification, and to facilitate and speed up assembly work regardless of this. The point is to make it.

The characteristic structure of the transmission structure according to the present invention is that the transmission case is constituted by a transmission case with one side open and the engine side open, and an end of the transmission shaft opposite to the engine side is installed inside the transmission case. is supported by a bearing formed in the transmission case, and the end on the engine side has a smaller area than the opening area of the open end surface of the transmission case, and the shaft support is bridged between the opening edges. A through hole through which the end of the transmission shaft can be inserted is formed in the auxiliary member, and the transmission case is configured to support the transmission case while being inserted into the through hole. A bearing part is formed on the outer wall part to support the protruding end part of the transmission shaft held in the transmission case via the shaft holding auxiliary member toward the engine side, and is not in communication with the engine side. , its effects are as follows.

In other words, the engine-side case itself, which is originally provided therein, is provided with a bearing portion that fits and supports the engine-side end of the transmission shaft. It's made for good. By configuring the transmission case so that there is no need to provide a wall on the engine side, the transmission mechanism can be assembled into the transmission case with the gear assembled to the shaft through this opening. This makes it easy to assemble the transmission mechanism, and there is no need to divide the transmission case into two, making it easy to manufacture the transmission case. If the transmission case is constructed with one side opening open on the engine side, there is a risk that the engine side end of the transmission shaft may move toward the opposite side when the transmission case is assembled to the engine side. The shaft holding auxiliary member is designed to restrict the free movement of the engine side end of the transmission shaft.
The transmission case is easily assembled while fitting the engine side end of the transmission shaft into the bearing part.

Therefore, by simplifying the transmission case, the overall configuration can be simplified, and the assembly work can be performed easily and quickly.
Eventually, a transmission structure with great practical advantages was achieved.

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, a transmission case 2 is connected to the rear end surface of the engine 1, a wheel drive chain case 3 is connected to the right side surface of the transmission case, and a tilling rotary case 4 is connected to the rear end surface of the transmission case. A pair of left and right control handle bars 5 are attached to the upper part of the transmission case, and one propulsion wheel 6 is installed to fit under the engine 1 and the transmission case 2. It is configured as a type tiller.

To describe the transmission structure inside the transmission case 2 in detail, as shown in FIGS. 2 and 3, a first transmission shaft 7 and a second transmission shaft 8 juxtaposed on the left side of the first transmission shaft 7 are arranged. , the engine side front end is fitted and supported by the engine side case 9, and the rear end is fitted and supported by the transmission case 2.
provided in a state where it is fitted and supported by the bearing parts 2a, 2b of
Then, an input gear 10 is connected to the engine output shaft (camshaft that is gear-linked to the crankshaft) 1A and is connected to the first transmission shaft 7 via a relay gear with idle rotation support.
The input gear 1 is freely rotatably supported on the second transmission shaft 8.
A clutch piece 11 that engages and disengages from the side surface of the main clutch C1 is slidably spline-connected to the second transmission shaft 8 to form a main clutch _C1 that connects and disconnects travel drive and tilling rotor drive at once. A traveling gear transmission device H is provided between the first and second transmission shafts to switch the rotational speed of the first transmission shaft 7 into two stages as the shift gear 12 slides, and the upper end side input of the chain case 3 is provided. The bevel gear 13 that outputs to the shaft 3A is
It is integrally and rotatably attached to the transmission shaft 7, and is configured so that the traveling speed can be changed into two stages, high and low. 1st
A power take-off shaft 14 fitted externally to the rear end of the transmission shaft 7 so as to be relatively rotatable is interlocked with an output gear 15 freely rotatably supported on the second transmission shaft 8, and the cylindrical input shaft 4A of the tillage rotary case 4 is , a safety device that is fitted to the power take-off shaft 14 so as to be able to freely rotate integrally therewith, and is provided between the output gear 15 and the second transmission shaft 8 to automatically cut off transmission when the tillage load exceeds a set value, and a sliding mechanism. Rotary clutches _C2 are respectively provided to cut off and cut off the drive of the tilling rotor in accordance with the operation of the spline-connected clutch pieces 16, so that the drive of the tilling rotor can be cut off separately from the travel drive.
It is constructed so as not to overload the tilling rotor.

To explain the transmission safety device, an annular rotating member 17 with which the rotary clutch piece 16 engages and disengages is provided so as to be elastically biased toward the output gear, and a ball that engages and disengages with the side of the output gear 15 is provided. 18 is held by the annular rotating member 17.

In order to restrict the free movement of the engine side ends of the first and second transmission shafts 7 and 8, the first and second transmission shafts 7,
A through hole 19a through which the engine side end of No. 8 can be inserted;
A shaft-holding plate-shaped auxiliary member 19 having a shaft holding member 19b is provided with both ends bolted to the transmission case 2, so that it can be attached to the engine side of the first and second transmission shafts 7 and 8 when the transmission case is assembled. The edge portions can be easily fitted into the cylindrical portions 20 and 21 serving as bearing portions of the engine side case 9. Also, the first
A cylindrical portion 20 relative to the transmission shaft 7 is projected inward of the transmission case, so that the transmission case 2 can be more easily assembled using the position of the cylindrical portion 20 as a guide.

The present invention can be applied not only to walk-behind tillers, but also to various types of mobile agricultural machinery such as binders.

Furthermore, in carrying out the present invention, the mounting structure of the auxiliary member 19 can be modified in various ways, such as attaching the auxiliary member 19 to the transmission case 2 in a cantilevered manner instead of attaching the auxiliary member 19 to the transmission case 2 in a dual-supported manner. Also, in the embodiment, the case where two transmission shafts 7 and 8 are installed is shown, but one or three transmission shafts may be installed.
You may equip more than one book. Furthermore,
Although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of drawings]

The drawings show an embodiment of the transmission structure according to the present invention,
FIG. 1 is a side view of the walk-behind cultivator, FIG. 2 is a partially expanded cross-sectional plan view of the transmission structure, and FIG. 3 is a front view showing the mounting portion of the shaft holding auxiliary member. 1...Engine, 2...Transmission case, 7, 8...
...Transmission shaft, 19...Auxiliary member for shaft holding, 20,2
1... Cylindrical part, 2a, 2b... Bearing part, 19a,
19b...Through hole.

Claims (1)

[Scope of utility model registration request] A transmission structure in which transmission shafts 7 and 8 are supported in a transmission case 2 connected to an end face portion of an engine 1 with the ends facing toward the engine side, and the transmission case 2 is open on the engine side. It consists of a transmission case 2 with one side open, and the ends of the transmission shafts 7 and 8 installed in the transmission case 2 on the side opposite to the engine side are connected to bearing parts 2a and 2b formed in the transmission case 2. The transmission shaft 7 is supported by an auxiliary shaft holding member 19 that has an area smaller than the opening area of the open end surface of the transmission case 2 and spans between the opening edges of the transmission case 2. Through-holes 19a and 19b through which the ends of 8 can be inserted
is formed so that it can be supported by the transmission case 2 while being inserted into the through holes 19a and 19b, and further,
The outer wall on the engine 1 side to which the transmission case 2 is connected supports the protruding ends of the transmission shafts 7 and 8 held in the transmission case 2 via the shaft holding auxiliary member 19 toward the engine side. bearing parts 20, 21
The transmission structure is formed so that it is not in communication with the engine 1 side.