JPS638547Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a transmission structure within a transmission case of a large tiller.

Conventionally, in this type of large transmission structure, in order to obtain a structure with multi-stage main gear, auxiliary gear, and reverse gear, the configuration of gears and shafts had to be as complicated and large as an elbow. It was difficult to find an engine that had enough horsepower to withstand heavy loads, was compact, and had good performance. The invention of this application was made to solve this problem, and in particular, it is a transmission case that can perform multi-stage main shifting, sub-shifting, and reverse shifting, and can also transmit power from the PTO shaft to rotary work machines, etc., and can be driven while traveling. The transmission structure is such that each of the five shafts (main shaft, PTO shaft, auxiliary transmission shaft, brake shaft, and final chain shaft) fully performs its respective functions, ensuring good horsepower transmission without loss. In addition, multi-speed gear shifting operations can be performed with a single lever, and each shaft is distributed two shafts forward and backward around the main axis at the apex of the pentagon, so it is possible to perform multi-speed shifting operations with a single lever. To provide a transmission having excellent characteristics that it is more balanced and stable than an arrangement, and has a simpler structure as a whole and can be installed and constructed in a small and compact manner.

Next, the embodiment shown in the drawings will be described.

Figure 1 shows a side view of the power tiller. Wheels 1' are mounted on both sides of the lower part of the transmission case A, and the engine E is installed in the front of the transmission case A, and the engine E is installed in the rear. A tilling part with a rotary 3 arranged on both sides of the lower part of a tilling case 2 is installed.

The transmission case A is split type, and both cases A
1 and A2 are joined together and the periphery is fastened with bolts and nuts 4. However, the upper part of the mission case A is bent rearward to form a rearward extending part a, and the rearward extending part A handle mounting base 5 made of a frame plate is fitted in a fitted manner, and the front part of the handle mounting base 5 is fixed to the upper part of the transmission case A with bolts 6, and the handle mounting base 5 extending to the rear is fixed to the upper part of the transmission case A. Handle rods 7' are fixed on both sides, and the handle 7 is formed at the rear of the handle rods 7' extending rearward.

In addition, the main shaft 8 is located at the top of the transmission case A.
The outer end of the main shaft 8 extending to the left side of the transmission case A is equipped with large and small pulleys 9, 9'.
and belt 1 from both engine pulleys 10, 10' of the engine E to the large and small pulleys 9, 9'.
1 and 11', and both belts 11 and 11' are connected to each other so that the clutch can be operated by tension pulleys 12 and 12'.
2 and 12' are operated alternately to enable transmission to be freely switched between high and low speeds.

Inside the upper part of the transmission case A, a PTO shaft 14 and an auxiliary transmission shaft 15 are disposed at the front and rear of the lower part of the main shaft 8, and the PTO shaft 14 and the auxiliary transmission shaft 15 are mounted so as to be at the apex position of a triangular triangle. Sub-shift shaft 1
A final chain shaft 16 and a brake shaft 17 are respectively disposed below the five shafts 8, 14, 1.
5', 16, and 17 are mounted at the apex positions of a pentagon, and the PTO shaft 14 extends to the right side outside the case to transmit power to the counter case 18 that transmits power to the tilling case 2 of the tilling section, A brake device 17' is installed at the left end of the brake shaft 17,
A chain 21 is wound from a sprocket 19 on the final chain shaft 16 to a sprocket 20 on the side of the axles 1, 1 to drive the axles 1, 1 via side clutches 22, 22'.

A two-tooth transmission gear 23 is spline-fitted to the main shaft 8 and is movably attached thereto.
Large, medium and small gears 25, 25', 25 are fixed to the PTO shaft 14, with a transmission gear 24 having a single tooth loosely fitted, one tooth of the transmission gear 23 being provided so that it can be engaged with the side of the transmission gear 24 in a detachable manner. The small gear 25'' of the transmission gear 24 is always engaged with the large teeth of the transmission gear 24, and the transmission gear 23 is selectively engaged with the large gear 25 and the side portion of the transmission gear 24, so that main transmission can be performed.

Further, a transmission gear 26 having two large and small teeth is spline-fitted and movably attached to the sub-transmission shaft 15, and the transmission gear 26 is selectively meshed with the large and medium gears 25, 25' to perform the sub-transmission. At the same time, when the large teeth of the transmission gear 26 mesh with the small teeth of the transmission gear 24, reverse gear shifting is possible. Furthermore, the small gear 29 of the brake shaft 17 and the large gear 30 of the final chain shaft 16 are always in mesh with each other.

A main transmission shifter B is installed above the rear part of the transmission gear 23. The main transmission shifter B is made of a plate and is pivoted to a plate support 31 so as to be rotatable around a pin 32. An engagement body 33 that engages with the transmission gear 23 is protruded from the lower front surface of the transmission shifter B, and approximately from the position of the engagement body 33 about the pin 32.
A passive body 34 made of a round pin is protruded from the rear surface of the main transmission shifter B at a 90 degree angle position, and the passive body 34
The main transmission shifter B is structured to be operable in a bell crank manner so that when the engaging body 33 is operated in the vertical direction, the engaging body 33 moves laterally.

In addition, two recesses 35 and 35' are formed in the upper part of the main transmission shifter B on a concentric circle with the pin 32 as the center, and both recesses 35 and 35' are formed in the cylindrical support 36 fixed on the front surface of the support body 31. , 35' is supported by a spring 38, and a long pin 3
9 is fixed to the tip of the support metal 36 with a solution W, and one end of the short pin 40 is fixed to the front side of the support body 31 on the side of the pin 32 by welding W. One end of the pins 39 and 40 can be inserted into blind holes 41 and 42 formed on the inner surface of the case A2, and the other end of the pin 39 can be inserted and assembled into a blind hole 41' formed on the inner surface of the case A2.

The transmission gear 2 is located below the main transmission shifter B.
A sub-transmission shifter C is installed at the rear of 6, and the sub-transmission shifter C is installed so as to be movable in the lateral direction on a support shaft 43 that is horizontally installed on the inside of the rearward extension part a.
A fork 44 that engages with the transmission gear 26 is formed at the lower part of the sub-transmission shifter C extending downwardly,
A fork portion 45 is formed and extends parallel and upward so as to be located above the support shaft 43 and behind the sub-transmission shifter C.

A spherical support seat 46 is formed at the rear end of the case of the rearwardly extending portion a, and a long rod-shaped shift lever D is fitted into a support ball 47 that is rotatably fitted into the support seat 46. The rotation regulating pin 48 is inserted through the support ball 47 and the gear shift lever D to attach it.
A shift lever D extending from inside the handle mounting base 5 to the rearwardly extending portion a is formed in a straight line, and a horizontally elongated engagement actuating portion 49 having a side U-shape is provided at the tip of the shift lever D. formed to engage the body 34;
An engaging portion 50 that can be inserted into the fork portion 45 and slidable in the vertical direction is located near the engaging portion 49.
is integrally molded into a round shape, and configured so that the direction of rotation of the shift lever D in the vertical direction about the support ball 47 is approximately parallel to the direction line connecting the main shaft 8 and the sub-shift shaft 15. .

A raised portion 51 is formed on the rear inner circumferential surface of the rearward extending portion a close to the support seat 46, and the raised portion 51
A bellows-shaped flexible cover 52 for preventing oil spillage is inserted into the circumferential portion of one end side of the cover 5, and the cover 5
The peripheral part of the other end of 2 is closely fitted to the gear shift lever D, and a circumferential groove-shaped mounting part 53 formed at the rear end of the rearwardly extending part a on the outside of the support seat 46 is provided with a groove-shaped mounting part 53 for preventing oil leakage. One end of the flexible cover 54 is fitted and locked, and the other end of the cover 54 is fitted and tightly fitted onto the gear shift lever D.

A shift indicator plate 56 is attached to the rear end of the handle mount 5, and the shift indicator plate 56 has upper and lower lateral shift grooves 57, 57', respectively.
are formed in communication with each other through a communication groove 57a on the right side, and the gear shift lever D inserted into this groove is connected to both gear shift grooves 57, 5.
If you move it laterally at 7', it will move backward 4 with a neutral position.
It is configured to be able to change speeds to 8 speeds and 8 forward speeds.

Therefore, when assembling, main transmission shifter B can be assembled by inserting both ends of pin 39 into both cases A1 and A2 at the time of mating, and inserting one end of pin 40 into case A1.

In addition, during operation, the main transmission shifter B part and the sub transmission shifter C part located at the front in the rearward extension part a are in a state where they can prevent the oil splashed by the gears from flowing backward, and furthermore, both flexible The oil covers 52 and 54 can prevent oil from leaking inside and outside.

In the transmission from engine E, operation lever 1
3, both tension pulleys 12, 1
2' can be operated alternately to perform high and low two-speed transmission to the main shaft 8 using both belts 11, 11'. Reverse 4
The machine can be shifted to 8 speeds and 8 forward speeds, and the machine can be operated in multiple stages during plowing and towing a trailer.

That is, in operating the shift lever D, when the shift lever D, which rotates around the support ball 47, is rotated in the vertical direction, the round engagement portion 50 moves up and down within the fork portion 45 of the sub-shifter C. When the horizontally elongated engagement actuating portion 49 is lowered, the passive body 34 is pushed down and the main transmission shifter B rotates around the pin 32 to actuate the engaging body 33 in one lateral direction in a bell crank manner. Further, when the engagement actuating portion 49 is raised, the passive body 34 is pushed up and the engagement body 33 is moved laterally from the state shown in FIG. 11 to the state shown in FIG. 12 by the bell crank type operation of the main transmission shifter B. Due to the lateral movement of the engaging body 33, the transmission gear 23 is moved in the lateral direction to perform main transmission.

Also, when the gear shift lever D is rotated in the horizontal direction,
The round engagement portion 50 engages with the fork portion 45 to move the sub-transmission shifter C laterally along the support shaft 43, and the fork 44 moves the transmission gear 26 laterally to perform the sub-shift. and reverse gear shifting.

The gear shift lever D rotates around the support ball 47,
The main transmission shifter B is actuated by vertical rotation substantially parallel to the direction line connecting the main shaft 8 and the sub-transmission shaft 15, and the sub-transmission shifter C is actuated by rotation in the lateral direction.

When high and low speeds are input from the engine E to the main shaft 8, the main and auxiliary speed changes are performed as described above, and forward and reverse speed changes are transmitted to the axles 1, 1 via the PTO shaft 14, the auxiliary speed change shaft 15, the brake shaft 17 and the final chain shaft 16.

Further, power can be transmitted from the PTO shaft 14 to the rotary 3, and a traveling brake can be applied by a brake device 17' at the brake shaft 17.

In this way, the present invention arranges a PTO shaft and an auxiliary transmission shaft in the upper part of a transmission case that has an axle at the bottom, below and behind an axle input from the outside, so that the three axles are located at the apex of a triangle. The final chain shaft and brake shaft are placed below the PTO shaft and sub-transmission shaft, respectively.
The five axles are mounted so that they are at the apex positions of a pentagon, and the main shaft and the PTO shaft perform multi-stage main transmission, the PTO shaft and the sub-transmission shaft perform multi-stage sub-transmission, and the main shaft and sub-transmission shaft perform multi-stage sub-transmission. In order to perform reverse gear shifting between the two, each of the main shaft and sub-shift shaft is provided with a transmission gear that can be moved laterally so as to mesh with a gear fixed to the PTO shaft. One of the conversion gears is configured to interlock with the gear shift lever via a mechanism that converts the shift lever into a single shift lever, so that multi-stage main shifting, sub-shifting, and reverse shifting can be performed. It has a transmission structure inside the transmission case that can transmit power from the PTO shaft to rotary work machines, etc., and drive it.
To this end, each of the five axes (main shaft, PTO shaft, auxiliary transmission shaft, brake shaft, and final chain shaft) fully performs its respective functions, and power transmission can be performed well without loss. Multi-speed shifting can be performed with a single lever, and each axis is divided into two axes forward and backward around the main axis at the apex of the pentagon, resulting in a well-balanced and stable design, and a simpler overall structure. The present invention provides a transmission having excellent features that allows it to be installed and configured in a small and compact manner.

[Brief explanation of the drawing]

Figure 1 is a side view of the tiller, Figure 2 shows a part of it, Figure 3 is a sectional view of the transmission case, and Figure 4 is a side view of the power tiller.
The figure is an enlarged view of a part of it, Figure 5 is a side sectional view of the upper part of the transmission case, Figure 6 is a front view of the gear shift indicator plate, Figure 7 is a part of Figure 5, and Figure 8 is a side sectional view of the upper part of the transmission case. Fifth
FIG. 9 is a plan sectional view of a portion of FIG. 5, FIG. 10 is a perspective view of a portion of FIG. 9, and FIG.
The figure is a front view of the main transmission shifter portion, and FIG. 12 is an explanatory diagram of the operation of FIG. 11. 1... Axle, A... Mission case, 8...
Main shaft, 14...PTO axis, 15...Sub-shift shaft, 1
6...Final chain shaft, 17...Brake shaft.

Claims (1)

[Scope of utility model registration request] Inside the upper part of the transmission case that has an axle at the bottom, below and before and after the main shaft that receives input from the outside.
A PTO axis and an auxiliary transmission axis are installed, and the 3 axes are 3
A final chain shaft and a brake shaft are respectively disposed below the PTO shaft and the auxiliary transmission shaft, and the five shafts are mounted so that they are at the apex position of a pentagon, and the main shaft A gear fixed to the PTO shaft is attached to each of the main shaft and the sub-transmission shaft in order to perform main shifting between the PTO shaft and the PTO shaft, sub-shifting between the PTO shaft and sub-transmission shaft, and backward shifting between the main shaft and sub-transmission shaft. A transmission gear is provided that is movable laterally so as to be able to mesh with the transmission gear, and one of the transmission gears and the transmission lever are configured to interlock with each other via a mechanism that converts vertical movement of the transmission lever into lateral movement. , a power transmission structure inside the transmission case of a tiller that can be operated with a single gear lever.