JPH0249142Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is mainly applied to front wheel drive tractors and the like, and relates to a variable vehicle height front wheel drive device that can change the vehicle height in two stages.

[Prior art]

Conventionally, when working in paddy fields, fields, etc. with a tractor, etc., the fixed case part of the axle is relatively high from the ground because the rear wheels have a large diameter, so there are no problems with the work. However, in the case of front-wheel drive vehicles, the fixed case for the front-wheel drive device is located at a relatively low position, which often damages or pushes down crops, and to prevent this, the vehicle height must be sufficiently high. It was necessary to use a tall tractor.

By the way, tractors are used not only for outdoor work, but also for indoor work in greenhouses, for example, and in this case, a tractor with a high vehicle height may not be able to be used, so it is necessary to prepare a tractor with a low vehicle height. There is.

However, as mentioned above, it is very uneconomical to prepare tractors with different vehicle heights depending on the work purpose, and in order to prevent this drawback, there have been various structures that can change the vehicle height of tractors. It is being considered.

As such conventional technology, Japanese Patent Application Laid-open No. 58-
Publication No. 61012 is proposed. However, in the device of the present invention, there are many protruding parts from the bottom of the case, and a large load is applied to the mounting part. However, mounting with bolts is very disadvantageous in terms of strength because it cannot be fixed to the final case side.

In addition, since the final case and the cover of this case are separate pieces, costs are high. In addition, when the final case is turned over, the oil drain plug will no longer be on the bottom, which not only makes it difficult to drain the lubricating oil, but also
One drawback was that the gears and bearings were not sufficiently lubricated due to their location.

Furthermore, there is a structure in which the final case is divided and the cases are connected, but since they are formed of independent chambers that are sealed together, it is necessary to provide an oil drain plug and oil filler port for each final case (gear case). There were problems such as forgetting to add oil or forgetting to drain lubricating oil during disassembly.

[Purpose of invention]

The present invention was made in order to solve the above-mentioned conventional problems, and the purpose is to provide a variable height front wheel drive system that requires fewer parts for changing the vehicle height and does not have any problems in terms of strength. That is.

[Structure of the idea]

In order to achieve the above object, the vehicle height variable front wheel drive system of the present invention has a shaft provided at the center of the final case cover fixed to the power outlet of the final case of the front wheel drive system, and an eccentric The final case cover is comprised of a wheel shaft provided at a position, and a gear connecting the kingpin shaft and the shaft and the wheel shaft in the final case, and the final case cover is fixed upside down. be.

This invention fixes the final case in a predetermined position and makes it possible to reverse the final case cover that closes the power outlet of the final case, and also allows the foil shaft to be attached to the shaft supported in the center of the final case cover. It is characterized by its eccentricity.

In other words, since only one wheel shaft moves up and down in response to a change in vehicle height, there are extremely few moving members. Of course, the shafts are connected by gears as in the conventional device, but the structure is simplified, the strength is improved, and the reversing operation is extremely easy. be.

[Example of idea]

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

First, it is a sectional view of the main parts of the front wheel drive device in the state when the vehicle height is low as shown in FIG.
As shown in the drawings and FIG. 5, it is used as a front axle of a tractor 21, and rotates a tire 18 via a wheel shaft 7.

As shown in FIG. 1, this front wheel drive device consists of a differential 2,
A fixed case portion consisting of a drive shaft 3 and the like, a kingpin case 4 containing a kingpin shaft 13, this kingpan shaft 13, and a bevel gear 12.
A final case 5 (this part is also a fixed part) has a built-in shaft 10, which is rotated by a bevel gear 11 that meshes with the bevel gear 12, and is attached to the final case 5 with a shaft 10 as the center of the mounting part. final case cover 6
is provided.

As shown in FIG. 3, a shaft 10 is provided at the center of the mounting portion of the final case cover 6.
A wheel shaft 7 is provided at a position eccentric to the shaft 10 via a bearing. The wheel shaft 7 is driven via a gear 8 that meshes with a gear 9 fixed to the shaft 10.

A tire 18 is fixed to this wheel shaft 7, and a movable case portion such as a final case cover 6 is supported by a king pin case 13 with respect to the opening of the final case 5, and is steered by a knuckle arm 14. ing.

As shown in FIG. 3, the final case cover 6 can be attached to and detached from the final case cover 5 using bolts 17, for example, at a hexagonal flange portion. And this final case cover 6
As shown in Figure 1, wheel shaft 7 is connected to shaft 1.
The wheel shaft 7 can be assembled in a position where it is eccentrically provided at the bottom of the shaft 10, or in a position where the wheel shaft 7 is provided at the top of the shaft 10 as shown in FIGS.

In the variable height front wheel drive system of the present invention having the above configuration, the shaft 10 is provided in the center of the final case cover 6, and the final case 5 that fits with the final case cover 6 is provided with a shaft 10 at the center of the final case cover 6.
The mounting holes 5a for the final case cover 6 are concentric.

Therefore, move the final case cover 6 up and down.
By rotating the wheel shaft 7 by 180 degrees, the mounting position of the wheel shaft 7 can be placed on either the upper or lower side of the shaft 10.

Therefore, the height from the center of the axle case 1 to the ground contact surface of the tire 18 can be varied from the high position L in FIG. 1 to the low position L in FIG. 2.

Note that there is an oil drain plug 2 at the bottom end of the final case 5.
If one 0 is provided, the lubricating oil inside the final case 5 and the final case cover 6 can be drained.

[Effect of idea]

In the present invention, a shaft 10 is provided in the center of the final case cover 6, a foil shaft 7 is provided eccentrically with respect to the shaft 10, and the final case cover 6 can be used by being reversed with respect to the final case 5. It is distinctive in its composition.

Therefore, in the front wheel drive device according to the present invention, the height position of the axle can be adjusted without providing a separate case in addition to the standard case as in conventional devices.
This can be easily converted by using a distance that is twice the eccentric distance between the shaft 10 and the wheel shaft 7.

Furthermore, the present invention has the advantage that the number of parts increases little and the cost of the device is extremely low.

In addition, unlike conventional vehicle height change type drive devices, there is no need for a separate oil filler port or drain from the main body for oil lubrication, and there is no fear of forgetting to add oil or forget to remove oil during disassembly.

Furthermore, the present invention has the advantage that the final case cover is firmly attached, prevents accidents such as breakage, and is highly reliable.

[Brief explanation of the drawing]

Figures 1 and 2 are front sectional views of essential parts showing the structure of a variable height front wheel drive system in an embodiment of the present invention, with Figure 1 showing the vehicle at high vehicle height, and Figure 2 showing the vehicle at low vehicle height. Fig. 3 is a front view of the final case cover in the state shown in Fig. 2, Fig. 4 is a plan view of the tractor equipped with the front wheel drive device in the state shown in Fig. 2, and Fig. 5 shows the state at high speed. is a side view of FIG. 4; 5... Final case, 6... Final case cover, 7... Wheel shaft, 8... Gear, 9... Gear, 10... Shaft, 17... Bolt.

Claims (1)

[Scope of utility model registration request] A shaft provided at the center of a final case cover fixed to a power outlet of a final case of a front wheel drive device, a wheel shaft provided eccentrically to this shaft, a kingpin shaft, a shaft, and a wheel shaft in the final case. A variable vehicle height front wheel drive device, characterized in that the final case cover is fixed upside down and fixed.