JP3328761B2 - Continuously variable transmission for agricultural machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuously variable transmission for an agricultural machine, such as a rice transplanter, which includes a seedling mounting table and planting claws to continuously perform seedling planting operations.

[0002]

Conventionally, Japanese Utility Model Laid-Open No. 1-17
Wrap a continuously variable transmission belt as shown in 1954
Move the movable pulley body of the continuously variable speed pulley, and
The continuously variable transmission is performed by changing the winding diameter of
The moving pulley is axially connected to the pulley shaft via a ball spline.
Movable pulley body and pulley
There is a technique of providing a collar between shafts. However,
The conventional technology uses cylinders and fixed pistons coaxially with the movable pulley body.
The movable pulley body is moved by providing
Since the pulley body and collar are formed with the same inner diameter,
Easy to hold tightly closed spline balls
To the movable pulley, collar and ball
There is a problem that it cannot be easily assembled .

[0003]

Means for Solving the Problems] However, the present invention moves the movable pulley member of a continuously variable transmission pulley wound around a continuously variable belt, by changing the winding diameter of the transmission belt performs stepless the movable pulley member through a ball spline to the pulley shaft is movably connected axially supported, Bo
Between the movable pulley body and the pulley shaft at both ends of the
Inside and outside to close the spline groove
Movable in the continuously variable transmission of an agricultural machine with a collar
Form the inner diameter of the inner collar larger than the inner diameter of the pulley body,
The outer diameter of the outer collar is made smaller, and
To improve operability by reducing
Move the ball of the ball spline between the dynamic pulley body and the pulley shaft.
While being configured to maintain a good seal,
In order of collar inside, movable pulley body, ball, outside collar
It can be easily incorporated into
This can improve efficiency and the like.

[0004]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory sectional view of an input pulley section, FIG. 2 is a side view of a riding rice transplanter, and FIG. 3 is a plan view of the same, wherein (1) is a traveling vehicle on which an operator rides, and an engine (2) is shown. Is mounted on the body frame (3) which is the center frame, and the front axle case (5) is located in front of the transmission case (4).
And a rear axle case (7) is connected to the rear of the transmission case (4), and a paddy traveling rear wheel (8) is mounted on the rear axle case (7). Let them support you. A spare seedling table (1) is provided on both sides of the hood (9) covering the engine (2) and the like.
0), the transmission case (4) and the like are covered by a body cover (12) on which an operator rides via a footrest (11), and a driver's seat (13) is provided above the body cover (12). A steering handle (14) is provided at the rear of the hood (9) in front of the driver's seat (13).

[0005] In the figure, reference numeral (15) denotes a planting section provided with a seedling table (16) for planting six rows and a plurality of planting claws (17). Forward tilting seedling platform (1
6) is supported on a planting case (20) via a lower rail (18) and a guide rail (19) so as to be reciprocally slidable right and left, and a rotary case (21) is rotated at a constant speed in one direction. A pair of claw cases (22) and (22) are supported at the case (20) and symmetrically positioned around the rotation axis of the case (21), and the claw case (22) is provided.
(22) Attach the planting claws (17) and (17) to the tip. A hitch bracket (24) is provided on the front side of the planting case (20) via a rolling fulcrum shaft (23), and is provided via a lifting link mechanism (27) including a top link (25) and a lower link (26). A hitch bracket (24) is connected to the rear side of the traveling vehicle (1), and the link mechanism (2)
7) A lifting cylinder (28) for raising and lowering the planting part (15) is connected to the lower link (26), and the front and rear wheels (6) and (8) are driven and moved, and simultaneously reciprocated right and left. A seedling for one plant is taken out from the slidable seedling mounting table (16) by a planting claw (17), and the planting operation is continuously performed.

In the figure, (29) is a main shift lever, (3)
0) is a planting operation lever which is also an auxiliary transmission lever, and (31)
Is a setting sensitivity adjusting lever, (32) is a main clutch pedal, (33) and (33) are left and right brake pedals, (34)
Is a center float for two-row equalization, (35) is a side float for two-row equalization, and (36) is a side-row fertilizer for six rows.

Further, as shown in FIGS. 4 to 7, a frame (37) is integrally fixed on the upper surface of the front part of the vehicle body frame (3) to be inclined to a low front and rear height (inclination angle of about 4 degrees). 37) On the upper surface where the front-rear direction is substantially horizontal,
8) The engine stand (39) is mounted via..., The engine (2) is mounted on the engine stand (39), a fuel tank (40) is provided on the left side of the engine (2), and the engine (2) is Attach the muffler (41) on the right side,
A battery (43) is attached to the front end side of the vehicle body frame (3) via a front frame (42).

Further, a case base (44) is integrally fixed to the body frame (3), a steering case (45) is mounted on the case base (44), and inserted into a tubular body (46) as a handle column. Connect the steering shaft (14a) of the steering handle (14) to the left and right body frame (3).
(3) The output shaft (47) is protruded from the lower surface of the steering case (45) at the approximate center of the steering case (45), and the left and right front wheels (6), (6) are turned. The steering arm (48) is connected to the output shaft (4
7).

A cylindrical bearing (49), which is substantially horizontal in the front-rear direction, is welded and fixed to the lower side of the engine stand (39) below the engine (2), and a countershaft (49) is attached to the bearing (49). The counter pulley (5) is provided at the front end of the counter shaft (50) for inserting and supporting the bearing body (49) forward.
An alternator (52) is disposed facing the engine (2) in front of the engine (2). An output shaft (53) is provided substantially in the upper center between the left and right body frames (3) and (3) and in front of the engine (2). And an output pulley (54) is attached to the output shaft (53). The output pulley (54) is connected to the counter pulley (51) via V-belts (55) and (55). The output pulley (54) is connected to the input pulley (56) of (52) via a V-belt (57).

Further, a rear axle case (7) is bolted and fixed to the rear end of the vehicle body frame (3), and a transmission case (4) rear surface is connected and fixed to a front surface of the rear axle case (7). ), A clutch case (58) is integrally formed on the right front surface of the clutch case (58), and a transmission belt (59), which is also a transmission case, is fixed to the right rear surface on the front surface of the clutch case (58). ) To operate the hydraulic pump (60) and the belt shift case (59).
The case (4) (58) (59) and the hydraulic pump (60) are fixed at a lower position than the upper surface between the left and right body frames (3) (3) in the form of a square pipe. And a transmission shaft (61) with a universal joint is provided between the rear end of the counter shaft (50) and the belt transmission case (59) to transmit the engine (2) output to the belt transmission case (59). A front wheel transmission shaft (62) is provided between the front axle case (5) and the transmission case (4), and the transmission output of the transmission case (4) is transmitted via the axle cases (5) and (7) to the front and rear wheels (6) ( 8).

Further, a lower link fulcrum shaft (63) is provided at the rear end of the vehicle body frame (3), and the fulcrum shaft (6) is provided.
3) The front end of the lower link (26) is attached, and a gate-shaped support (64) is erected between the rear ends of the left and right body frames (3) and (3). 65), and the front end of the top link (25) is attached to the base (65) via the top link fulcrum shaft (66).

Further, a pedal fulcrum pipe (67) provided with the brake pedal (33) is provided, and the pipe (67) is inserted into the left and right body frames (3) (3), and both ends of the pipe (67) are provided. Is fixed to the body frame (3) by welding, and the pipe (67) is attached as a connecting member of the left and right body frames (3) and (3), and the left and right sub-frames (68) and (6) to which the lifting cylinder (28) is attached.
8) and a sub-frame (6
8) The front end is welded and fixed to the pedal fulcrum pipe (67), and the rear end of the subframe (68) is welded and fixed to the upper end of the column (64).

As shown in FIGS. 8 to 10, the input / output pulley (6) for changing the gear ratio continuously by changing the winding diameter.
9) The (70) and the speed change belt (71) are provided in the belt speed change case (59), and the input shaft (72) which is a pulley shaft of the belt speed change case (59) via the transmission shaft (61) with the universal joint. Connect the front end to the counter shaft (5
0) The hydraulic pump (60) is directly connected to the rear end of the input shaft (72), and the clutch pedal (3) is connected to the rear end of the input shaft (72).
Multi-disc friction dry clutch (7) intermittently operated by 2)
3) is provided inside the clutch case (58), and the output shaft (74) of the belt transmission case (59) is connected to the input shaft (75) of the transmission case (4) via the clutch (73). .

Further, a tension roller (76), input / output cams (77) (78) for changing the belt winding diameter of the input / output pulleys (69) (70), and each cam (77).
Input / output rollers (79) (80) to be brought into contact with (78)
And a speed change arm (82) is provided on the belt speed change case (59) via a speed change shaft (81).

Further, the middle of a tension arm (83) is rotatably mounted on the output shaft (74).
A tension roller (76) is rotatably provided on one end side of the arm (8) via a shaft (84), and the arm (8)
The other end of 3) is connected to one end of a tension spring (85). Also, a receiving shaft (8) is attached to the belt speed change case (59).
6) A receiving arm (8) is provided at one end of a receiving shaft (86) that rotatably supports the middle and protrudes into the case (59).
7) The base end is integrally fixed, the end of the tension spring (85) is locked at the tip of the receiving arm (87), and the tension spring (85) is connected between the tension arm (83) and the receiving arm (87). . As shown in FIG. 11, the base end of the lock arm (88) is fixed to the other end of the receiving shaft (86) projecting out of the case (59), and the tip of the lock arm (88) is connected to the case (59). ) A bolt (89) is fixedly fixed to the outer surface, the arms (87) and (88) are integrally fixed to the case (59) by the bolt (89), and the tension spring (85) is supported in a tensioned state. The roller (76) is pressed against the speed change belt (71) to maintain the tension of the speed change belt (71) at or above a predetermined value.

Further, the belt speed change case (5)
9) is formed in a split structure, and the bearing type rollers (79) (80) are rotatably provided in the middle of a support shaft (90)... And are opened in the direction of contact and separation (coalescence separation) of the front and rear case bodies. The bearing recesses (91)...
One end of the support shaft (90) is formed in the inner surface, and one end of the support shaft (90) is fitted into the bearing recess (91), and the other end of the support shaft (90) is connected to the case (5).
9) A bolt (92) is fixedly fixed to the inner surface, and each roller (7) is fixed to the inner surface of the case (59) via a support shaft (90).
9) A bearing recess (91) in which the (80) is detachably mounted and opened in the disassembly direction of the transmission case (59).
By fixing the support shaft (90) to the transmission case (59) detachably by using one bolt (92) and
The transmission case (59) and the bearing recess (91) can be easily formed by aluminum die casting or the like, and the support shaft (90) is fitted into the bearing recess (91) and the bolt (92) is inserted into the support shaft (90). ) Tightening and other operations can be performed easily.

The link (93) and the rod (9)
4) and the input / output cams (77) and (78) are connected to the transmission shaft (81) via the connecting rod (95), and the planting operation lever (30) is connected to the transmission arm (82). The input / output shaft (72) is operated by operating the lever (30).
The input / output cams (77) and (78) are rotated around (74) to change the width of the input / output pulleys (69) and (70) to change the winding diameter of the speed change belt (71).
9) The gear ratio of the (70) and the speed change belt (71) is configured to be changed steplessly.

On the other hand, as shown in FIGS. 11 and 12, the transmission arm (82) is a continuously variable transmission mechanism (96) composed of input / output pulleys (69) (70) and a transmission belt (71).
Is provided with a low-speed return mechanism (97) for returning from "high speed" to "low speed" separately from the operation of the lever (30), and is attached to the transmission shaft (81) at the front side of the transmission case (59) in a free running manner. A gas spring (100) as a return member for low-speed return is interposed between the arm operation plate (98) and a mounting stay (99) fixed to the front surface of the transmission case (59),
A shift arm (8) fixedly mounted on the shift shaft (81).
2) and the operation plate (98) can be flexibly connected to the high-speed side via the pin (101) and the long hole (102), and the spring (1).
03), the arm (82) is connected to the operation plate (98) so as to be able to follow, and when the speed change arm (82) moves to the low-speed and high-speed positions, it is brought into contact with the low-speed and high-speed positions to regulate the position. High-speed stopper (104) (1
05) is fixed to the front surface of the transmission case (59).
When an accident such as breakage or partial loss occurs in an operation system such as a speed change rod (106) connecting the operation plate (98) and the lever (30), the gas spring (100) is used regardless of the operation system. The stepless speed change mechanism (96) is configured to return from the high speed side to the low speed by the returning force of (1).

As shown in FIGS. 1, 8, and 9, the input / output pulleys (69) and (70) are divided into right and left and fitted to input / output shafts (72) and (74) via a key (107). A fixed pulley body (69a) (70a) for fixing, and an input / output shaft (7
2) A movable pulley body (69b) (70) that is fitted to (74) movably in the axial direction via a ball spline (108).
b), the input / output cams (77) and (78) interlockingly connected via the connecting rod (95) are rotated by the shift arm (82), and are turned on as shown in FIG. The inclined cam surface (109a) of the sintered metal cam body (109) provided at a position 180 degrees opposite to the side circumference of the output cams (77) and (78) is applied to each of the input / output rollers (79) and (80). When the movable pulleys (69b) and (70b) are brought into contact with each other and approach the fixed pulley bodies (69a) and (70a), the winding diameter of the belt (71) is increased.

Cooling fins (110) are integrally formed radially at equal intervals on the back surface of the fixed pulley bodies (69a) (70a) to cool them when the input / output pulleys (69) (70) rotate. It is configured to perform.

The movable pulley body (69b) of the input pulley (69) is rotatably connected to the input cam (77) via a bearing (111) and connected and supported on the outer periphery so as to be integrally movable in the axial direction. Spline grooves on the inner circumference (11
2) and a ball spline (10) with a ball (114) interposed between the spline groove (113) for input (72).
8), and the movable pulley body (69b) is connected to the input shaft (7).
It is provided so as to be movable in the axial direction by integral rotation with 2).

Further, retaining rings (115) are fitted to both ends of the spline groove (112) of the movable pulley body (69b), and the ball (114) is held between the retaining rings (115). Inner and outer collars (116) and (117) are provided between the input shaft (72) at both ends of the spline groove (113) and the movable pulley body (69b), and both ends of the spline groove (113) are inserted into the inner and outer collars (11).
6) It is configured to be covered by (117).

The inner and outer collars (116) (11)
7) The inner peripheral surface is in sliding contact with the outer peripheral surface of the input shaft (72), and the outer peripheral surface is in sliding contact with the inner peripheral surface of the movable pulley body (69b). ), The O-rings (118) and (119), which are seal members,
Further, each collar (116) (117) and the movable pulley body (6
9b) Dust seal (120) serving as a seal member between
The grease is sealed inside by keeping the ball spline (108) in a sealed state with the (121) interposed therebetween.

The inner diameter (D1) of the outer collar (117), the inner diameter (D2) of the movable pulley body (69b), and the inner diameter (D3) of the inner collar (116) are sequentially increased (D1 <D).
2 <D3), so that the input shaft (72) can be easily assembled from the shaft end.

The cam surfaces (109a) of the input / output cams (77) and (78) are brought into contact with the input / output rollers (79) and (80), and the movable pulley is integrated with the cams (77) and (78). When moving the body (69b) (70b) in the axial direction of the input / output shafts (72) (74), the ball spline (10
By the rolling of the ball (114) and the lubricating effect of grease of 8), the moving resistance can be reduced and the operating force can be greatly reduced.

As is apparent from the above, the continuously variable transmission belt
Movable pulley of continuously variable pulley (69) around (71)
The body (69b) is moved and the speed change belt (71) is wound
In addition to performing a continuously variable transmission by changing the diameter,
Bore the body (69b) to the input shaft (72), which is the pulley shaft.
Axially movable through the spline (108).
The movable splines at both ends of the ball spline (108)
Ball (69b) and the input shaft (72)
In (108) spline groove (112) (113) groove
Through the inner and outer collars (116) (117)
In the continuously variable transmission of an agricultural machine to be installed, a movable pulley
Of the collar (118) inside the inner diameter (D2) of the (69b).
The inner diameter (D3) is made larger (D3> D2), and
The inner diameter (D1) of the roller (117) is small (D2> D1)
The operability is improved by reducing the shifting operation force.
And a movable pulley body (69b) is input.
Ball of ball spline (108) between shafts (72)
While (114) is configured to be kept tightly closed,
Collar (118) inside movable end of input shaft (72)
Re-body (69b), ball (114), outer collar (11
7) In order to replace these parts and perform maintenance and inspection work
Improve efficiency.

In addition to the configuration in which the ball spline (108) is used for each of the movable pulley bodies (69b) and (70b) of the input / output pulleys (69) and (70), only the input movable pulley body (69b) is used. It is also possible to use a ball spline (108) to move the output pulley body (70b) in the axial direction using a color bearing or the like.

[0028]

As is apparent from the above embodiments, the present invention moves the movable pulley member (69b) of the continuously variable transmission pulley (69) around which the continuously variable transmission belt (71) is wound, thereby changing the transmission belt (71). When changing the winding diameter performing stepless and
In both cases, the movable pulley body (69b) is connected to a pulley shaft (72).
The ball spline (108) is movably connected in the axial direction via a ball spline (108).
Bore between the movable pulley body (69b) and the pulley shaft (72)
Spline groove (112) (1)
13) Inner and outer collars (116) (11) for closing the groove
7) In the continuously variable transmission of an agricultural machine,
Collar (11) from the inner diameter (D2) of the coil body (69b).
The inner diameter (D3) of 8) is formed large (D3> D2), and
Reduce the inside diameter (D1) of the outer collar (117) (D2> D
1) The operability is reduced by reducing the shifting operation force.
And the movable pulley body (69
b) and the ball spline (10) between the pulley shaft (72).
So that the ball (114) of 8) is kept in a tightly closed state.
While being constructed, the collar (11) inside the end of the pulley shaft (72)
8) ・ Movable pulley body (69b) ・ Ball (114) ・ Outside
Side collar (117) can be easily assembled in this order.
Efficiency improvement of replacement and maintenance work of these parts in which the like may Figure Rukoto.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of an input pulley unit.

FIG. 2 is an overall side view of the riding rice transplanter.

FIG. 3 is an overall plan view of the riding rice transplanter.

FIG. 4 is a side view of the traveling vehicle.

FIG. 5 is a plan view of the traveling vehicle.

FIG. 6 is an explanatory front view of the engine unit.

FIG. 7 is an explanatory side view of a transmission case.

FIG. 8 is an explanatory plan view of a transmission case.

FIG. 9 is an explanatory sectional view of a transmission case portion.

FIG. 10 is an explanatory rear view of a transmission case portion.

FIG. 11 is an explanatory front view of a transmission case portion.

FIG. 12 is an explanatory side view of a transmission case.

FIG. 13 is an explanatory diagram of a movable pulley body.

[Explanation of symbols]

 (69) Variable speed pulley (69b) Movable pulley body (71) Variable speed belt (72) Input shaft (pulley shaft) (108) Ball spline (112) (113) Spline groove (116) (117) Color

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16H 9/00-9/26 F16H 55/32-55/56 F16C 29/00-31/06 F16D 3 / 06

Claims (1)

(57) [Claims] 1. A continuously variable transmission by moving a movable pulley body (69b) of a continuously variable transmission pulley (69) around which a continuously variable transmission belt (71) is wound, thereby changing a diameter of the continuously variable transmission belt (71). performs, is movably connected supporting the movable pulley body (69b) through a ball spline (108) in the axial direction to the pulley shaft (72), ball spline (10
8) The movable pulley body (69b) at both ends and the pulley shaft (7)
2) Spline groove of ball spline (108) between
(112) (113) Inner and outer collars for closing grooves
(116) Continuously variable transmission of agricultural machine interposed by (117)
, From the inner diameter (D2) of the movable pulley body (69b)
Increase the inner diameter (D3) of the inner collar (118) (D3> D
2) and the inner diameter (D) of the outer collar (117).
A continuously variable transmission for an agricultural machine, wherein 1) is formed small (D2> D1) .