JPS592981Y2 - Transmission device of power agricultural machinery - Google Patents

Description

[Detailed description of the invention] This invention is a power agricultural machine in which the handle and the gear lever are configured to be freely rotatable back and forth. This invention relates to a transmission device that ensures the safety of workers by automatically disabling high-speed reverse gear shifting when performing work by switching to the opposite state on the engine side.

Examples of this invention will be described below based on the drawings.

First, the configuration will be explained.

A handle 3 is attached to a mission case 2 of a machine body 1 of a power agricultural machine so as to be changeable between a forward direction extending to the side opposite to the engine 4 of the machine body 1 and a rear direction located toward the engine 4 side, A transmission case 2 includes a forward transmission stay 5 for shifting between a forward transmission (not shown) and a reverse transmission (not shown), and a reverse transmission stay 6 located below the stay 5 in the left and right direction. A forward speed change boss 7 and a reverse speed change boss 8 are fixed to the projections of the forward speed change stay 5 and the reverse speed change stay 6 from the mission case 2 so as to be slidable in parallel.

An engaging portion 7a is provided on opposite sides of the forward speed change boss 7 and the reverse speed change boss 8, and communicates with each other and opens rearward.
, 8a.

On the other hand, behind the two transmission bosses 7 and 8, a U-shaped transmission bracket 10 is pivoted to the transmission case 2 so as to be able to move up and down via a support shaft 9. The bases of the shift arm 11 are fitted into the support holes 10 ax and 10 b+ along the vertical direction of the upper and lower support pieces 10 a and 10 b of the bracket 10 to engage with the engaging portions 7 a and 8 a of both shift bosses 7.8. An end support shaft 11a is rotatably mounted, and a spline hole 11a1 is formed in the upper part of the base support cylinder 11a of the speed change arm 11.

A spline hole 12a1 that engages with the spline hole 11a1 is formed in a part of the base support cylinder 11a.
a, and insert it into the base support cylinder 11a and the vertical shaft 12H.
A spacer 13 is fitted in between, and a spring 14 is fitted onto the vertical shaft 12a so as to press the lower end of the spacer 13, and the lower end of the spring 14 is connected to the vertical shaft 12a via a stopper 12b.
I support it.

``At the tip of the mold lever base 12, there is a gear shift lever 15.
The transmission guide 16 is fixed to extend rearward along the fuselage 1, and the transmission guide 16 is fixed to the lateral side of the mission case 2.
The forward shift horizontal hole 17a in the normal state of the bundle 3 is on the rear end side, and the horizontal forward shift hole 17a in the reverse state where the bundle 3 is switched from the normal state to the opposite state is on the front end side.
7b is provided, and both forward speed change horizontal holes 17a are provided.
, 17b, is offset along this vertical hole 17C, and is located between the vertical holes 17C to form a reverse low speed horizontal hole 17 in the normal state of the bundle 3.
Reverse low speed change horizontal hole 17 in opposite state of d and bundle 3
The gear shift lever 15 is inserted into the shift guide groove 17 to indicate the shift position of the shift lever 15.

In addition, 18 is a bundle rotation fixing device, and 19 is a hitch.

Next, the operation of this invention will be explained.

When performing towing work by connecting a trailer and a work machine (not shown) to the hitch of the body 1 of a power agricultural machine, shift lever 1
5 downward to move the gear shift arm 11 to the forward gear shift boss 7.
When the gear lever 15 is then rotated to the right, the forward gear shift stay 5 moves to the left, the forward gear is shifted, and the aircraft 1 starts moving forward at a low speed. , when inertia is obtained, the forward speed change stay 5 is moved to the right by rotating the speed change lever 15 from the neutral position to the left, the forward speed change device is switched to high speed, and the aircraft 1 moves forward at high speed. .

When the aircraft 1 is to move backward, when the gear shift lever 15 is rotated upward along the gear shift guide hole 17 of the gear shift guide 16, the gear shift arm 11 is moved to the retaining portion 8a of the gear shift boss 8 for reverse motion.
, and then rotates to the right along the low-speed reverse gear horizontal hole 17d in the middle of the gear change guide hole 17 to move the reverse gear stay 6 to the left and switch the reverse gear to low speed, The direction of the aircraft 1 can be changed by moving the aircraft 1 backward at low speed.

In addition, while operating the bundle rotation fixing device 18,
The gear shift lever 15 is connected to the vertical axis 1 in the spline hole 11a1.
2. Remove the spring 1 so as to release the spline 12a1 of a.
4, pull the bundle 3 upward and rotate it to the opposite side, then release the hand, put the bundle 3 and the shift lever 15 in the opposite state, and shift the shift lever 15 forward along the vertical hole 17C of the shift guide (L17). When moving to the horizontal hole 17b, the shift arm 1
1 is fitted into the retaining portion 8a of the reverse boss 8, and then when the shift lever 15 is rotated to the right along the forward shift horizontal hole 17b of the shift guide hole 17, the reverse shift is performed via the reverse shift stay 6. By changing the device, the aircraft 1 can be moved forward at low speed when the bundle 3 and the gear shift lever 15 are in opposite states, and when the gear shift lever 15 is rotated to the left from the neutral position, the aircraft 1 can be moved forward at high speed. be able to.

Therefore, the mower can be attached to the hitch 19 for mowing work, and the hitch 19 can be attached to a tilling device to perform ridge breaking work.

During such work, the aircraft 1 was placed at the edge of the field.
When it is necessary to move the aircraft 1 backward in order to change the direction of 7a, rotate the gear shift lever 15 to the right along the low-speed reverse gear horizontal hole 17e, and move the forward gear shift stay 5.
is moved to the right to convert the forward transmission, and the aircraft 1 is moved backward at low speed with the bundle 3 and the transmission lever 15 in the opposite state.

Note that, as described above, the shape of the vertical hole 17C of the shift guide hole 17 prevents the bundle 3 and the shift lever 15 from changing gears to high-speed reverse in the normal state and in the opposite state.

In short, this invention consists of a bundle 3 and a gear shift lever 1.
Normal state with 5 facing backwards and 18 for this normal state
In a power agricultural machine that is configured to be able to freely rotate between opposite states separated by 0°, a portion of the shift lever 15 that is offset in the front-rear direction from the center of rotation is inserted into the shift guide hole 17 of the shift guide mounted on the machine body 1. The forward speed change horizontal hole 17a when the speed change lever 15 is in the normal state and the forward speed change horizontal hole 17b when the speed change lever 15 is in the opposite state are spaced apart from each other in the front and rear.
A vertical hole 17C (7) that connects 7L17a and 17b is located in the middle of the vertical hole 17C (7L), and the shift lever 15 is shifted from one another along the vertical hole 17C to the opposite position with the vertical hole 17C in between. This transmission is characterized by having horizontal transmission holes 17 d and 17 e, and vertical holes 17 of the transmission guide hole 17 .
Shift levers 15 are offset along the vertical hole 17C in the middle of the vertical hole 17C, and are positioned opposite to each other across the vertical hole 17C.
Low-speed reverse gear shift horizontal hole 17 in the above two installation states of
d and 17 e are connected in series, and the gear shift lever 15
The gear is not shifted to the high speed of reverse in either of the two installation states, and the dangerous shift state of high speed reverse is shifted to the free side by the shift guide, so there is no need to provide a special drive mechanism, and the structure is simple. However, the safety of the workers can be ensured at all times, and since the shifting sensation remains the same before and after changing bundles, it has become possible to create a transmission that is easy to use and can be used by anyone.

[Brief explanation of the drawing]

FIG. 1 is an overall side view showing this invention, FIG. 2 is a side view of the main parts when the bundle and the shift lever are in the normal state, and FIG. 3 is a side view of the main parts when the bundle and the shift lever are in the opposite state. Figure 4 is a plan view of the speed change guide;
The figure is a sectional view of the center of rotation of the gear shift lever. Explanation of symbols 1... Aircraft, 2... Mission case, 3... Bundle, 4...
・Engine, 5...Forward gear change stay, 6...
... Reverse gear change stay, 7... Forward gear change boss, 8... Reverse gear change boss, 9...
Support shaft, 10...U-shaped gearshift bracket, 11
......Shift arm, 12..."Type lever base, 13...Spacer, 14...
Spring, 15... Speed lever, 16...
Speed change guide, 17... Speed change guide hole, 17 a
...Forward gear change horizontal hole, 17b... Forward gear change horizontal hole, 17 C... Vertical hole, 17d...
・Low speed reverse side hole, 17 e... Low speed reverse speed change side hole, 18... Bundle rotation fixing device, 19.
...Hitsuchi.

Claims (1)

[Scope of utility model registration request] In a powered agricultural machine configured to be able to rotate freely between a normal state in which the handle 2 and the gear shift lever 15 face backward and a reverse state separated by 180 degrees from the normal state, the front and back directions from the center of rotation of the gear shift lever 15 The shifted portion is inserted into the shift guide hole 17 of the shift guide attached to the aircraft body 1, and the shift guide hole 17 is inserted into the forward shift horizontal hole 17a in the normal state of the shift lever 15 and the opposite state of the shift lever 15. The forward speed change horizontal holes 17b and the forward speed change horizontal holes 17b are provided spaced apart from each other in the front and rear, and both the forward speed change horizontal holes 17a,
17b, low-speed reverse gear horizontal holes for the gear shift lever 15 are located in the middle part of the vertical hole 17C connecting the vertical holes 17b, and are offset from each other along the vertical hole 17C and at opposite positions sandwiching the vertical hole 17C. A transmission characterized in that 17d and 17e are provided.