JP3696722B2 - Continuously variable transmission - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a continuously variable transmission.
[0002]
[Prior art]
Conventionally, the input / output pulleys mounted on the input / output shafts that are mounted on the shaft while maintaining a predetermined interval are composed of fixed pulleys fixed to the input / output shafts and movable pulleys that can move in the axial direction. There is a continuously variable transmission in which a continuously variable transmission belt is wound around and the effective winding diameter of the input / output pulley is changed by the movement of each moving pulley so that the gear ratio can be changed continuously. In order to make the sliding in the direction smooth, a space filled with lubricating oil is provided between the inner peripheral surface of the boss of the moving pulley and the outer peripheral surface of the input / output shaft.
[0003]
[Problems to be solved by the invention]
However, the lubrication oil in the space overflows to the input / output pulley due to the operation of the moving pulley or expansion due to temperature rise, etc., causing slippage between the input / output pulley and the continuously variable transmission belt, resulting in poor power transmission. There were problems such as being reliable and urging the belt to wear.
[0004]
[Means for Solving the Problems]
Therefore, in the present invention, the input / output pulleys respectively mounted on the input / output shafts that are pivoted while maintaining a predetermined interval are constituted by fixed pulleys fixed to the input / output shafts and movable pulleys that are movable in the axial direction, In an infinitely variable transmission where the continuously variable transmission belt is wound between the input and output pulleys, the effective winding diameter of the input and output pulleys is changed by the movement of each moving pulley, and the gear ratio can be changed continuously. A hydraulic pump is linked to one end of the shaft via a joint, a clutch is linked to one end of the output shaft, and a lubricating oil filling space is provided between the inner peripheral surface of each moving pulley and the outer peripheral surface of the input / output shaft. Provided, open the lubricating oil filling space on the input pulley side to the shaft end facing the joint of the input shaft through the communication hole, and the shaft end facing the clutch of the output shaft through the communicating hole on the output pulley side Steplessly characterized by opening to It is intended to provide cents a machine.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the input / output pulleys mounted on the input / output shafts that are held at predetermined intervals are respectively composed of fixed pulleys fixed to the input / output shafts and movable pulleys that are movable in the axial direction. In a continuously variable transmission in which a continuously variable transmission belt is wound between pulleys, the effective winding diameter of the input / output pulley is changed by the movement of each moving pulley, and the gear ratio can be changed continuously. A lubricating oil filling space was provided between the inner peripheral surface of the boss and the outer peripheral surface of the input / output shaft, and the lubricating oil filling space was communicated with the outside air through a communication hole formed in the input / output shaft. In addition, a hydraulic pump is linked to one end of the input shaft via a joint, a clutch is linked to one end of the output shaft, and between the boss inner peripheral surface of each moving pulley and the outer peripheral surface of the input / output shaft. A lubricating oil filling space is provided, the lubricating oil filling space on the input pulley side is opened at the shaft end facing the joint of the input shaft through the communication hole, and the lubricating oil filling space on the output pulley side is connected to the output shaft through the communication hole. Opened to the end of the shaft facing the clutch.
[0008]
【Example】
Embodiments of the present invention will be described with reference to the drawings.
[0009]
FIG. 1 shows a riding rice transplanter B equipped with a continuously variable transmission A according to the present invention. The riding rice transplanter B has three planting devices D at the rear of a traveling vehicle C capable of self-propelling. It is connected so as to be able to move up and down via a link mechanism E, and a seedling is planted on the rice field in the field while pulling the planting device D by the traveling vehicle body C.
[0010]
The traveling vehicle body C is provided with a front axle case 3 with left and right front wheels 2 attached to left and right ends and a rear axle case 5 with left and right rear wheels 4 attached to left and right ends, respectively, on the lower surfaces of the front and rear portions of the main frame 1. A bonnet 7 with a built-in engine 6 is disposed on the upper surface of the front portion of the main frame 1, and spare seedling stands 8 are disposed on both the left and right sides of the bonnet 7. A steering wheel 10 is attached to the upper end of the steering column 9, a seat 11 is provided behind the bonnet 7 at a predetermined interval, and a side fertilizer 12 is disposed behind the seat 11.
[0011]
Then, the power from the engine 6 is transmitted to the transmission case 13 disposed on the lower surface of the main frame 1 to change the speed, and is transmitted to the left and right rear wheels 4 through the relay gear box 14 and the rear axle case 5. The power is transmitted from the relay gear box 14 to the left and right front wheels 2 via the front drive shaft 15 and the front axle case 3.
[0012]
Inside the transmission case 13, the input shaft 16 and the output shaft 17 are mounted side by side, and the effective winding diameter is changed between the input shaft 16 and the output shaft 17 in a stepless manner. A continuously variable transmission A composed of input / output pulleys 18 and 19 for performing speed change and a continuously variable transmission belt 20 having a substantially trapezoidal cross section is provided. 17 and a movable pulley 22 that is provided to face the fixed pulley 21 and that is movable in the axial direction.The input pulley 18 and the output pulley 19 include a fixed pulley 21 and a movable pulley. 22 is in the opposite position.
[0013]
The continuously variable transmission belt 20 is wound between the input / output pulleys 18 and 19, and the tension roller 26 pivotally supported on the tip of the tension arm 25 biased by the spring 24 is connected to the outer periphery of the continuously variable transmission belt 20. To keep the tension of the continuously variable transmission belt 20 constant, cams 27 and 27 are provided behind the moving pulleys 22 and 22, respectively, and the cams 27 and 27 are rotated. When the moving pulleys 22 and 22 are moved in the axial direction and the effective winding diameter of one of the input / output pulleys 18 and 19 is increased, the effective winding diameter of the other is decreased, so that the gear ratio is continuously variable. I am trying to change it.
[0014]
One end of the input shaft 16 of the continuously variable transmission A is interlocked with the engine 6, the hydraulic pump 29 is interlocked with the other end via an Oldham type joint 28, and one end of the output shaft 17 is connected via a clutch 30. The power from the engine 6 is transmitted to the hydraulic pump 29 and the left and right front and rear wheels 2 and 4 in conjunction with the relay gear box 14.
[0015]
In particular, between the movable pulleys 22 and 22 and the input / output shafts 16 and 17, the movable pulleys 22 and 22 are connected to the input / output shafts 16 and 17 so as not to rotate or to slide in the axial direction. Bearings 31 and 31 are provided, and lubricating oil filling spaces 33 and 33 are provided between the inner peripheral surfaces of the bosses 32 and 32 of the movable pulleys 22 and 22 and the outer peripheral surfaces of the input and output shafts 16 and 17, respectively. The left and right ends of the lubricating oil filling spaces 33 and 33 are sealed with oil seals 34 and 34, respectively, and one end of each of the lubricating oil filling spaces 33 and 33 communicates with the lubricating oil filling spaces 33 and 33. L-shaped communication holes 35 and 35 are drilled, the other end of the communication hole 35 on the input shaft 16 side is opened at the shaft end on the hydraulic pump 29 side, and the other end of the communication hole 35 on the output shaft 17 side is the clutch. It is opened at the shaft end on the 30 side.
[0016]
In this way, the lubricating oil filling spaces 33 and 33 on the inner peripheral surfaces of the respective moving pulleys 22 and 22 are communicated with the outside air through the communication holes 35 and 35, so that the operation of the moving pulleys 22 and 22 and high temperature Leakage of lubricating oil to the pulley side due to expansion or the like is prevented, and as a result, slippage between the input / output pulleys 18 and 19 and the continuously variable transmission belt 20 is prevented, and power transmission is ensured. Wear of the transmission belt 20 can be prevented.
[0017]
Furthermore, the lubricating oil overflowing from the lubricating oil filling spaces 33 and 33 lubricates the joint 28 and the clutch 30, and these operations can be made smooth and wear can be prevented.
[0018]
The planting device D is provided with a seedling table 37 that is inclined to the front and rear and above and below the planting drive case 36 that also serves as a frame so as to be movable left and right, and extends rearward from the planting drive case 36, respectively. From the seedling mat placed on the upper surface of the seedling table 37 by rotating the planting claws 39 to the rear ends of the three planting cases 38 and rotating the planting claws 39, A certain amount of seedlings are scraped off and planted on the rice field.
[0019]
The seedling stage 37 folds and expands a seedling stage side part 41 that can place two seedling mats on the left and right sides of the seedling stage central part 40 on which six seedling mats can be placed. The left and right side planting cases 42 are connected to the left and right ends of the planting case 38 so as to be foldable and expandable. Accordingly, when the seedling stage side part 41 and the left and right side planting cases 42 are expanded, ten seedlings can be planted, and the seedling stage side part 41 and the left and right side part planting cases 42 are When folded, the width of the planting device D is reduced, and it is possible to carry out storage and traveling on the road.
[0020]
The three-point link mechanism E is constructed such that a left and right lower link 44 and a top link 45 are installed between the rear surface of the traveling vehicle body C and the link mounting portion 43 provided continuously to the front end portion of the planting drive case 36. An elevating mechanism (not shown) arranged at the rear part is interlocked with the left and right lower links 44 so that the planting device D is moved up and down while maintaining a parallel state. An expansion / contraction mechanism 46 is provided to adjust the front / rear inclination angle of the planting device D. In the figure, 47 is a float.
[0021]
3 and 4 show the mounting structure of the auxiliary wheel 50. In FIG. 3, the original wheel 54 is mounted on the axle 52 having a substantially regular hexagonal cross section protruding from the axle support case 51 via the wheel boss 53. Auxiliary wheels 50 are mounted on the inner side of the wheels 54, and a push screw 56 is inserted into a pin hole 55 formed in the wheel boss 53 and the axle 52, and the wheels 54 are tightened by tightening the push screws 56. And the auxiliary wheel 50 are mounted on the axle 52. Thus, by mounting the auxiliary wheel 50 inside the original wheel 54, the bending moment acting on the axle 52 is reduced, and it is not necessary to reinforce the axle. In addition, by replacing the left and right wheels 54 and the auxiliary wheels 50, the auxiliary wheels 50 can be arranged close to the outside of the wheels 54. In FIG. 4, an extension axle 58 is connected to the outer surface of the original wheel 54 via an attachment frame 57, and an auxiliary wheel 50 is attached to the outer end of the extension axle 58.
[0022]
【The invention's effect】
According to the present invention, the following effects can be obtained.
[0023]
According to the first aspect of the present invention, the input / output pulleys mounted on the input / output shafts that are pivoted while maintaining a predetermined interval are composed of fixed pulleys fixed to the input / output shafts and movable pulleys that are movable in the axial direction. In the continuously variable transmission in which the continuously variable transmission belt is wound between the input and output pulleys, the effective winding diameter of the input and output pulleys is changed by the movement of each moving pulley, and the gear ratio can be changed continuously. A hydraulic pump is linked to one end of the input shaft through a joint, a clutch is linked to one end of the output shaft, and lubricating oil is filled between the inner peripheral surface of each moving pulley boss and the outer peripheral surface of the input / output shaft. A space is provided, the lubricating oil filling space on the input pulley side is opened to the shaft end facing the joint of the input shaft through the communication hole, and the lubricating oil filling space on the output pulley side is exposed to the clutch of the output shaft through the communication hole. Lubrication by opening the shaft end Lubricating oil overflowing from the filling space to lubricate the joints and clutches, it is possible to prevent the smoothly worn these actuation.
[0024]
Further, the lubricating oil filling space can be communicated with outside air through a communication hole formed in the input / output shaft, and the lubricating oil in the lubricating oil filling space is prevented from overflowing to the input / output pulley side. Therefore, slippage between the input / output pulley and the continuously variable transmission belt can be prevented, power transmission can be ensured, and wear of the continuously variable transmission belt or the like can be prevented.
[Brief description of the drawings]
FIG. 1 is a side view of a riding rice transplanter equipped with a continuously variable transmission according to the present invention.
FIG. 2 is a cross-sectional side view of a continuously variable transmission.
FIG. 3 is a front view showing an auxiliary wheel mounting structure.
FIG. 4 is a front view showing an auxiliary wheel mounting structure.
[Explanation of symbols]
A continuously variable transmission
16 input shaft
17 Output shaft
18 Input pulley
19 Output pulley
20 Continuously variable belt
21 Fixed pulley
22 Moving pulley
28 Fitting
29 Hydraulic pump
30 clutch
32 Boss
33 Lubricant filling space
35 communication hole

Claims (1)

Fixed pulleys (21 and 21), which are fixed to the input and output shafts (16) and (17), respectively, are attached to the input and output shafts (16) and (17) that are mounted on the shaft while maintaining a predetermined interval. ) (21) and movable pulleys (22) and (22) that can move in the axial direction, and a continuously variable transmission belt (20) is wound between the input and output pulleys (18) and (19). 22) In the continuously variable transmission (A) in which the effective winding diameter of the input / output pulley (18) (19) is changed by the movement of (22) and the gear ratio can be changed steplessly,
One end interlockingly connected to the hydraulic pump (29) via a joint (28) of the input shaft (16), the interlocking connection of the clutch to one end of the output shaft (17), of each mobile pulley (22) (22) Lubricating oil filling space (33) (33) is provided between the inner peripheral surface of the boss (32) (32) and the outer peripheral surface of the input / output shaft (16) (17) , and lubricating oil is charged on the input pulley (18) side. Open the space (33) through the communication hole (35) at the shaft end facing the joint (28) of the input shaft (16) , and connect the lubricating oil filling space (33) on the output pulley (19) side to the communication hole (35 ) Through the shaft end facing the clutch (30) of the output shaft (17) .

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