JPS589298Y2 - Gear transmission for agricultural vehicles - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a transmission device for an agricultural vehicle, particularly a tiller.

That is, in a gear transmission for an agricultural vehicle that has a transmission case that is wide on the upper side and narrow on the lower side when viewed from the side, the
By arranging the main transmission shaft as close to the upper part of the transmission case as possible, a section where the thickness of the transmission case in front view can be reduced can be created from the middle part of the transmission case to the lower part. It is possible to configure a transmission case with a long transmission case, which makes it possible to install large-diameter wheels or adjust the distance between the wheels to make the distance between the wheels extremely small, depending on various agricultural conditions. An object of the present invention is to provide a transmission device for an agricultural work vehicle that has further improved adaptability to agricultural work.

Hereinafter, the present invention will be explained in detail based on examples thereof.

FIG. 1 is a side view of a knob-and-wheel shifting type tiller equipped with the gear transmission of the present invention.

1 is a prime mover engine, 2 is a wheel, 3 is a rotary tiller, and 4 is a tail wheel.

Their arrangement and operation are the same as the conventional ones.

The handle 5 can be changed between positions 5a and 5b by operating a fastening fitting, and the shift lever guide 11 fixed to the handle 5 can also be moved forward and backward together with the shift lever 9.

6 is the transmission case, 7 is the main shaft which is the input speed change shaft,
8 is a clutch link, and 10 is a clutch lever.

FIG. 2 is a view of the handle 5 and the speed change lever guide fixed thereto as seen from the handle operating side.

A gear shift lever guide 11 is fixed to the handle 5,
The gear shift lever groove 12 shows one side in the case of 5 forward gears and 1 reverse gear. In this embodiment, the main gear shift and the auxiliary gear shift are configured to be operated with one gear shift lever, but two levers are used. It is also possible to divide it into two grooves.

Fig. 7 is a side view showing the main part of the present invention and shows the arrangement of the shafts in the mission case 6, and is a comparison of the mission case 6 in which the upper side is wide and the lower side is narrow in side view. The main shaft 7, which is an input transmission shaft, and the auxiliary transmission shaft 1, which is a transmission shaft for auxiliary transmission, are installed in the upper part, which has a large space.
3. The driven shaft 14, which is an output speed change shaft, and the idle shaft 42, which is a speed change shaft, are connected to the main shaft 7, the sub-speed change shaft 13, and the driven shaft 1.
4 and an idling shaft 42 are arranged close to each other so as to be substantially horizontal so as to form a substantially parallelogram, and an axle 44 is disposed on the lower side of the transmission case 6.

FIG. 3 is a drawing showing the arrangement of shafts and gears within the mission case 6.

Reference numeral 1 designates the aforementioned engine, and the power from the engine 1 is decelerated and transmitted to the main shaft I by a belt between the engine 1 and the main shaft 1.

It is also possible to perform multi-stage shifting using a belt tension type transmission.

Two sets of sliding gears 15 and 16 and another sliding gear 17 are slidably supported on the aforementioned main shaft T, and fixed gears 18 and 19 and a sliding gear 20 are supported on the sub-transmission shaft 13. ing.

The driven shaft 14 has 212 fixed gears and two free rotating gears 22, 22.
a and the sprocket 24 are supported.

Two sets of idle gears 43 and 23 are supported on the idle shaft 42 so as to freely rotate.

44 is an axle, and 45 is a connecting shaft that freely connects the left and right axles.

25 is a sprocket, and 26 is a left and right steering clutch device.

Fig. 3 shows the meshing state of the gears at each speed change.
For 1 forward speed, prime mover 1 → main shaft 7 → sliding gear 15 → fixed gear 18 → sub-shift shaft 13 → sliding gear 20 → free rotating gear 22
It is transmitted in the following order: → Idle gear 22a → Idle gear 23 → Idle gear 43 → Fixed gear 21 → Driven shaft 14 → Sprocket 24.

In the case of two forward speeds, the motor 1 → main shaft 7 → sliding gear 16 → fixed gear → auxiliary transmission shaft 13 → sliding gear 20 → free rotating gear 22 →
Idle gear 22a → Idle gear 23 → Idle gear 43 → Fixed gear 21 → Sprocket 24, in the case of 3 forward speeds, prime mover 1
→ Main shaft 7 → Sliding gear 15 → Fixed gear 18 → Sub-shift shaft 13
→ Sliding gear 13 → Fixed gear 21 → Sprocket 24, in the case of 4 forward speeds, prime mover 1 → Main shaft T → Sliding gear 16 → Fixed gear 19 → Sub-transmission shaft 13 → Sliding gear 20 → Fixed gear 21
→ Sprocket 24, in case of 5 forward speeds, prime mover 1 → main shaft I → sliding gear 17 → sliding gear 20 → fixed gear 21 → gear rocket 24, and in case of reverse, prime mover 1 →
Main shaft 7 → sliding gear 17 → idle gear 22 → idle gear 22a
It is transmitted in the following order: → Idle gear 23 → Idle gear 43 → Fixed gear 21 → Sprocket 24.

FIG. 4, FIG. 5, and FIG. 6 are diagrams each showing a gear shift lever device, and in this embodiment, a configuration is shown in which the shift lever can be changed and the gears can be changed with one gear shift lever 27.

Reference numeral 27 indicates the base of the gear change lever 90.

A mounting seat 39 is fixed to the transmission case 6, and a vertical rotation shaft 38 is fixed to the fixed seat.

A backward tillage check fitting 31 is also rotatably attached to the vertical rotation shaft.

The reverse tillage restraint fitting 31 works in conjunction with the tillage clutch lever to prevent the tillage clutch from being engaged at high speeds of second or higher reverse speed.

The shift lever device rotates as the horizontal rotation shaft 32 rotates around the vertical rotation shaft, causing the shifter 33 to move up and down, and the shift lever fixed shaft 30 rotates around the horizontal rotation shaft 32, causing the shifter 33 to move up and down. 33 can also be rotated left and right.

For convenience of explanation, FIG. 4 shows the relative positional relationship between the connecting component from the speed change lever 27 to the shifter 33 and the connecting component from the transmission case 6 to the horizontal rotating shaft 32. The shifter 33 and the vertical rotation shaft 38 are arranged so as to be perpendicular to each other in a half-plane view, as shown in FIG. 5 to be more precise.

Reference numeral 28 denotes a gear shift lever position fixing fitting 28, which allows the shift lever 9 to be alternatively fixed at the positions 9a and 9b.

Reference numeral 29 denotes a reverse speed change restraining device, which restrains reverse movement in 2nd or 3rd or higher speeds with a reverse tillage restraint fitting.

33 is a shifter that rotates left, right, up and down, and is a gear shifter shaft 36
, 35, and 34 to change gears.

The speed change shifter shaft 36 has two sliding gears 15 and 16 on the main shaft I.
Move from side to side.

The speed change shifter shaft 35 moves the sliding gear 20 on the auxiliary speed change shaft 13 left and right.

The shift lifter shaft 34 moves the sliding gear 17 on the support shaft 7 left and right.

36 has an engaging portion 36a. The two notches of 36b open downward, and the engaging portion 35a of 35 opens forward.

Moves by the width of 36b and performs a sub-shift for height and low, and moves forward 1.
．． 2. 3. Get 4th speed.

The engaging portion 34a of No. 34 is opened upward and is engaged only at the high position of the sub-shift to obtain five forward speeds and reverse speed.

37 is a shift case.

With the configuration described in detail above, the mission case 6 has the support shaft 7, the sub-shift shaft 13, the driven shaft 14, and the idle shaft 42 formed so that the upper side is wide and the lower side is narrow when viewed from the side. The transmission case 6 can be arranged centrally in the upper part, which has a relatively large space, and the thickness of the transmission case 6 when viewed from the front must be increased in order to accommodate various transmission shafts and gears. While condensing on the upper side of the mission case 6, in order not to mount various transmission shafts and gears internally, a section where the thickness of the transmission case 6 in front view can be made small can be created from the middle part of the mission case 6 to the lower part. It can be formed to be as long as possible, and depending on the conditions of various agricultural operations, large diameter wheels can be installed accurately without interfering with the transmission. It becomes possible to adjust the distance between the wheels to minimize the distance, thereby further improving adaptability to various agricultural tasks.

As described above, the present invention provides a gear transmission for an agricultural vehicle having a transmission case 6 having a wide upper side and a narrow lower side when viewed from the side. The input speed change shaft 7 and the auxiliary speed change shaft 13, and the output speed change shaft 14 and the speed change shaft 42 are brought close to each other so as to be in a substantially horizontal state, respectively, so that the four speed change shafts 7, 13.
14. 42, while the mission case 6
The three transmission shifter shafts 34, 35° 36, which shift the gears slidably provided on the input transmission shaft 7 and the auxiliary transmission shaft 13, are arranged so that an axle 44 is disposed on the lower side of the transmission case. 6 A single shifter 3 protrudes outward parallel to the downward direction of the road and is rotatable vertically and horizontally.
3, and by this shifter 33, the three shifter shafts 3
4, 35, and 36, so that each one of them can be slid laterally, the uppermost shifter shaft 36 has a downward direction, the center shifter shaft 35 has a lowermost shifter shaft Since the shifter shaft 34 is provided with an upwardly engaging portion that engages with the shifter 33, a section where the thickness of the transmission case can be made small when viewed from the front is set from the middle part to the lower side of the transmission case. This makes it possible to install large-diameter wheels or make the distance between the wheels extremely small depending on various agricultural conditions.Also, even though the transmission case is thin, , it becomes possible to change the speed in multiple stages, and has the remarkable effect of further improving adaptability to various agricultural operations.

[Brief explanation of drawings]

Figure 1 is a side view of a variable-handle cultivator equipped with the gear transmission of the present invention, Figure 2 is a view of the gear shift lever guide viewed from the handle operation side, and Figure 3 is the arrangement of the shaft and gears in the transmission case. FIG. 4 is a developed side cross-sectional view showing the base structure of the shift lever, FIG. 5 is a plan view of the shift lever device, and FIG. 6 is an enlarged view of the shift shaft. FIG. 7 is a diagram showing the arrangement of the shafts inside the mission case. 1...Engine, 2...Wheels, 7...
...Main shaft, 13...Sub-shift shaft, 14...
... Driven shaft, 42 ... Idle shaft.

Claims (1)

[Scope of utility model registration request] In a gear transmission device for an agricultural vehicle, which has a transmission case 6 that is formed to have a wide upper side and a narrow lower side when viewed from the side, an input speed change shaft 7 and an input speed change shaft 7 are provided on the upper side of the mission case 6. The sub-shift shaft 13, the output shift shaft 14, and the shift shaft 42 are brought close to each other so that they are in a substantially horizontal state, and the four shift shafts 7. 13.14.42fi! : At the same time, an axle 44 is arranged on the lower side of the transmission case 6, and the input speed change shaft 7 and the sub-speed change shaft 1
Three gear shifter shafts 34, 35, and 36 that shift gears slidably provided at the transmission case 6 are protruded from the transmission case 6 parallel to the downward direction of the road, and are freely rotatable in the vertical and horizontal directions. One shifter 33 is provided at the uppermost gear shifter shaft 36 in order to enable each one of the three gear shifter shafts 34, 35, 36 to be slid laterally by the shifter 33. An agricultural mobile vehicle characterized in that engaging portions that engage with the shifter 33 are provided downwardly, on the gear shifter shaft 35 in the center sideways, and on the lowermost gear shifter shaft 34 upwardly. Gear transmission.