JP2520992Y2 - Belt type continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a belt type continuously variable transmission, and more particularly to a gear shifting operation means thereof.

(B) Conventional technology Conventionally, in a belt type continuously variable transmission that is operated by a manual operation means or a reciprocating operation means such as a hydraulic cylinder,
It is already known that the reciprocating operation means for changing gears is directly linked to a movable cam.

(C) Problems to be solved by the invention In the known belt type continuously variable transmission, when the groove width of one split pulley is narrowed by the rotation of the movable cam operated by the reciprocating operation means, the other split pulley is When the groove width is widened while resisting the ammunition and the gear is changed, and when the movable cam is reversely rotated by the reciprocating operation means, the groove width of the split pulley is enlarged corresponding to the amount of rotation of the movable cam. The movable pulley of the split pulley is contracted by an ammunition while sandwiching the V-belt with the fixed pulley and transmitting.

However, at this time, when the groove width of one of the split pulleys is rapidly expanded by the reciprocating operation means, the groove width reduction of the other split pulley by the ammunition cannot be followed in time, which causes one of the split pulleys and the V-belt. Were separated from each other to be in a non-conducting state, and this non-transmitting state sometimes stopped the groove width reducing operation of the other split pulley by the bullet.

Also, since the joint surface between the movable cam of the known belt type continuously variable transmission and the fixed cam provided facing it was exposed, mud and other debris entered the joint surface and the movable cam operated. It became defective or the operation amount became inappropriate.

(D) Means for solving the problems In the present invention, a V-belt is wound between a drive split pulley and a driven split pulley, and a movable cam joined to a fixed cam provided on the drive split pulley side is reciprocally operated by reciprocating means. While rotating so as to be operable in a direction in which at least the groove width of the drive split pulley is reduced, the ammunition provided on the driven split pulley side urges in a direction in which the groove width of the driven split pulley is reduced to shift gears. In the belt type continuously variable transmission described above, a cylindrical body is rotatably fitted to the outer periphery of the fixed cam to cover a joint portion of both cams, and a connecting plate projecting from the cylindrical body serves as the reciprocating operation means. A receiving member that is connected to the movable cam and is integral with the movable plate is provided so as to face the connecting plate, and the receiving member contacts the connecting plate by the rotation of the connecting plate due to the operation toward one side of the reciprocating operation means. Drives the movable cam with the groove of the split pulley The ammunition is provided on the driven split pulley side by operating the receiving plate and the connecting plate by rotating the connecting plate in accordance with the operation of the reciprocating operation means to the other side while operating in the direction of decreasing the width. The aforementioned problem is solved by making the groove width of the driven split pulley larger while the groove width of the driven split pulley is reduced by the urging force.

(E) Action When the reciprocating operation means is actuated to one side, the tubular body that covers the joint between the fixed cam and the movable cam rotates, which causes the connecting plate protruding from the tubular body to form a receiving member that is integral with the movable cam. As a result of contacting with the movable cam and rotating the movable cam, the groove width of the drive split pulley becomes narrower, and the movable pulley of the other driven split pulley has a wider groove width against the ammunition via the V belt. Works.

Further, when the reciprocating operation means is operated to the other side, the connecting plate protruding from the cylindrical body moves away from the receiving member and retracts, and the movable pulley of the other driven split pulley is pushed by the ammunition to reduce the groove width. At the same time, the V-belt continues to be transmitted while being pulled, and the movable pulley of the drive split pulley sequentially expands the groove width by the pulling force of the V-belt, so that the transmission is not interrupted.

During such speed change transmission, since the above-mentioned cylindrical body covers the joint between the fixed cam and the movable cam, it is possible to prevent dirt and weeds and other debris from entering the joint. It is possible to perform an appropriate continuously variable transmission according to the rotation amount of the movable cam at all times.

(F) Embodiments An embodiment of the present invention will be described with reference to the drawings. A threshing device 3 is mounted on one side of a machine base 2 having a traveling device 1, and on the other side, an operation panel 4 and an operation are sequentially performed from the front. A seat 5 and a paddy treatment unit 6 are provided, an engine is provided in the lower part of the driver's seat 5, and a pretreatment device 7 including a mowing device and a grain culm transporting device is provided in a front portion of the threshing device 3 by a pretreatment frame. It is mounted so that it can be tilted up and down, and a single-acting hydraulic cylinder is interposed between the front portion of the machine base 2 and the pretreatment frame to tilt the pretreatment device 7 up and down.

Further, a mission case 10 is provided below the threshing device 3 in the operation step 8, and the mission case 10 is provided.
In the upper part of the rear, the input shaft 13 driven by the belt 12 with the tension pulley 11 is supported by the engine,
Immediately below it is the drive shaft 15 to which the drive split pulley 14 of the belt type continuously variable transmission is attached, and the pump shaft 16
Is supported as a lower side, and a driven shaft 20 to which a driven split pulley 18 having a main clutch 17 formed of a multi-plate clutch is attached to a protruding portion is supported on the front upper side, and the drive shaft of the driven shaft 20 is supported. On the 15 side, a cutting drive shaft 23 driven by the driven shaft 20 via the gears 21 and 22 is supported, and the auxiliary transmission shaft 25 is provided below the drive shaft 15 obliquely rearward from the driven shaft 20. The counter shaft 26, the side clutch shaft 27, and the left and right crawler drive sprockets 28, 28 are mounted on the axles 30, 30 on which the driven shaft 20 is rotatably supported, and between the forward gear 33 and the reverse gear 35. The forward / reverse speed change clutch 36, which is spline-fitted in the above, is moved by the main speed change lever 71, which will be described later, via the shifter 37 and the like, and the cylinder shaft 38 loosely fitted to the cutting drive shaft 23 meshes with the forward gear 33. Gear 39 and auxiliary transmission shaft 25
A gear 40 meshed with a gear 34 spline-fitted to the gear is fixed, and the reverse gear 35 is also meshed with the gear 40.

The sub-transmission gear 41 is a small diameter gear, a large diameter gear, and a medium diameter gear in order from one side, and is spline-fitted to the sub-transmission shaft 25 so as to be slidable. And a switching operation via the shifter 72b, and the counter shaft 26 is fixed with a large gear 42, a small gear 43, and a middle gear 45 in which the large, medium, and small gears of the auxiliary transmission gear 41 are selectively meshed,
A center gear 46 rotatably supported at the center of the side clutch shaft 27 meshes with the pinion gear 43 and has clutches on both sides of the shaft supporting portion, and a pair of left and right clutch gears 48, 50 are not rotatable on both sides thereof. Although it is transmitted, it is slidably attached to the left and right, and the side brake 5 is placed outside each clutch gear 48, 50.
1, 52 are mounted on the spool 53, which is oil-tightly supported above and constitutes a steering switching device.The spool 53 has a pair of left and right flanges 55, 56, and a lower end of the clutch gears 48, 50. The bent portions at the upper ends of the shifters 57, 58 loosely fitted in the circumferential groove face the insides of the flanges 55, 56 of the spool 53, and the oil chambers 60, 61 into which both ends of the spool 53 are inserted are A steering valve 62 is connected to a pump 63 as shown in the hydraulic circuit diagram.

The drive shaft 15, the driven shaft 20, and the axle 30 are arranged in an inverted triangular shape in a side view as shown in FIG. 4 among the respective transmission shafts below the belt type continuously variable transmission mechanism. 23 is disposed between the upper drive shaft 15 and the driven shaft 20, and the auxiliary transmission shaft 25, the counter shaft 26, and the side clutch shaft 27, which constitute the acceleration / deceleration mechanism, are disposed between the driven shaft 20 and the axle 30. It is arranged. With such a configuration, the belt type continuously variable transmission is positioned within the height of the transmission case 10, and as shown in FIG. 1 (a), the drive split pulley 14 and the driven split pulley 18 of the continuously variable transmission are provided. When the mission case 10 can be arranged in a state where the and are intruded below the operation step 8 and another work machine such as the pretreatment device 7 is arranged on the side of the mission case 10, the work case is operated. 8 can be approached or can be arranged with sufficient margin.

Further, the operation panel 4 is provided with one operation lever 59 supported by a spherical body 64 so as to be tilted in different directions,
The steering valve 62 and the lifting valve 65 of the hydraulic cylinder 6a of the pretreatment device 7 are integrally combined as a unit A, and the steering valve 62 is mounted on one side of a sphere 64 to lift the lifting valve.
65 is attached to a bracket 4c fixed to a cross rail connecting the left and right columns, which is a skeleton member of the operation panel 4, so that the rams 62a, 65 are located at the rear portion (or front portion).
a is linked to the operating lever 59, and the lifting valve 65
The ram 65a has a protrusion 65b fixed to the side surface of the upper end thereof, and a lock shaft 67 rotatably supported by the operation panel 4 has a grip portion 68 at the outer end and a crescent-shaped cutout at the outer periphery of the inner end. Then, the projection 65b is allowed to descend, and the notched outer peripheral surface serves as a descending stopper 69, and an inverted L-shaped ascending stopper 70 is fixed to the outside thereof.

The cam, which is attached to the drive split pulley 14 and expands and contracts the V-groove width, is composed of a fixed cam 74a integral with the transmission case 10 and a movable cam 74b which is rotatable and slidable. The hydraulic cylinder 73, which is a reciprocating operation means connected to the movable cam 74b, is a transmission valve 75 attached to the pump 63.
It is connected to the.

FIG. 6 shows a hydraulic circuit of the speed change valve 75, the steering valve 62, and the lift valve 65.
62 and the lifting valve 65 are connected in series by an oil passage 76 so as to communicate with the pump 63 when they are both in the neutral state, and the lifting valve 65 is pumped more than the steering valve 62 so that it is prioritized. Located on the 63 side, both valves 62,65
The oil supply passages 77, 78 and the oil passages 80 bypassing the valves 62, 65 are provided with throttle valves 81, 82, 83 to limit the inflow amount, so that it is possible to operate each hydraulic operating portion at the same time. It is possible to install the throttle valve 85 also in the return oil passage 84 of the elevating valve 65.
The hydraulic oil outflow speed from the single-acting hydraulic cylinder 6a that is reduced in operation by its own weight is limited, and the hydraulic oil to the speed change valve 75 is supplied by the oil passage 86.

The operating device of the belt type continuously variable transmission will be described with reference to FIG. 5. A pair of arms 87a, 87b whose openings are opposed to each other in a neutral state are provided on both sides of the front-rear rotation support shaft 71a of the main transmission lever 71.
The arms 88 and 89 projecting forward and backward from the bosses are interlocked with the arms 91 and 92 of the support shaft 90 by rods 93 and 94, and the arm 95 at the end of the support shaft 90 is intermediate. The arm 97 of the shaft 96 is connected by a rod 97a, the sliding arm 96a is fixed to the intermediate shaft 96, and the floating gear 96b also serving as an intermediate gear is rotatably supported, and is attached to the tip of the swing arm 96a. A hook rod 99 is fixed to a gear 98 which is rotatably supported, and the tip of the hook rod 99 is loosely fitted in a long hole 102 of a plate 101 fixed to the rotary shaft 100. One end projects outside the mission case 10, and the arm 103 fixed to this projection is linked to the arm 104 of the transmission valve 75 attached to the pump 63 via a rod 104a. Further, the gear 10 is provided on one side of the cylindrical body 105 which is fitted to the fixed cam 74a of the continuously variable transmission and covers the overlapping portion with the movable cam 74b.
5a is engraved, a gear 107 fixed to one end of a shaft 106 is meshed with the gear 105a, and an intermediate gear 108 fixed in the other end and inside the transmission case 10 is meshed with the idle gear 96b. There is.

Further, an L-shaped arm 109 having a front / rear rotation supporting shaft 71a of the main speed change lever 71 fixed to an upper part thereof is supported by a fulcrum shaft 109a so as to be capable of left / right rotation, and its side end portion is connected to the forward / backward speed change clutch 36. Since the rod 110 is interlocked with the arm 110 that operates the shifter 37 of the main shift lever 71,
In the state where is located in the middle of the lateral groove that is the neutral position,
The forward / reverse shift clutch 36 is in the neutral position, and when it is tilted in the left / right direction, the forward / backward movement is switched.In this state, the hydraulic cylinder 73 is contracted and the groove width of the drive split pulley 14 is maximized. When the arm 95 is tilted forward or backward from such a switching state, the arm 95 rotates downward (accelerates) and rotates.
98 swings while swinging downward with the swing arm 96a, the hook rod 99 integrated with it swings down the plate 101, thereby opening the transmission valve 75, and the hydraulic oil from the pump 63 to the hydraulic cylinder 73. When the hydraulic cylinder 73 is sent, the pin 74d is pushed down by the connecting plate 105b, which will be described later, while being expanded, so that the movable cam 74b is rotated to increase the speed. The connecting plate 1
When the cylindrical body 105 integrated with 05b rotates, the gear 105a engraved on the cylindrical body 105 rotates, and the gear 98 meshed with it rotates.
Is a gear 107 and an intermediate gear 108 in the mission case 10,
Since the hook rod 99 is rotated in the upward rotation direction via the idle gear 96b, the shift valve 75 is sequentially closed,
The predetermined speed-up shift operation is completed. On the contrary, when the main transmission lever 71 is tilted toward the neutral position, the respective parts perform operations opposite to those described above, and the hydraulic cylinder 73 is contracted and decelerated. that time,
The rotation angle of the movable cam 74b is fed back to the shift valve 75 by the gears 108, 96b, 98, the hook rod 99, the plate 101 and the like that are axially supported in the mission case 10, so that it is accurately transmitted and fed back. No dirt, straw or other substances will adhere to the mechanism.

Thus, the belt type continuously variable transmission will be described in more detail. The cylindrical body 1 rotatably fitted to the outer periphery of the fixed cam 74a.
A connecting plate 105b is welded to the outer periphery of 05.
105b is a pin 73a at the lower end of the rod of the hydraulic cylinder 73.
And a movable cam 74b
When the hydraulic cylinder 73 is extended, the connecting plate 105b pushes the receiving pin 74d to rotate the movable cam 74b. The movable split pulley is pushed out to reduce the groove width of the drive split pulley 14, and the movable split pulley of the driven split pulley 18 expands the groove width while compressing the spring 18a, thereby increasing the speed. When the hydraulic cylinder 73 is contracted during deceleration, the connecting plate 105b is immediately returned and rotated via the pin 73a, and is separated from the receiving pin 74d that is integral with the movable cam 74b on the one hand, and the driven split on the other hand. Since the pulley 18 has its groove width reduced by the extension action of the spring 18a attached thereto and the winding radius of the V-belt becomes large, the V-belt is pulled toward the driven split pulley side, whereby the drive split pulley 14 The groove of the above will be widened, and the movable split pulley and the movable cam 74b will be
While joining to 4a, it returns and rotates until the receiving pin 74d contacts the connecting plate 105b, and slides backward while maintaining the transmission state.

Therefore, when the hydraulic cylinder 73 contracts like the one in which the rod of the hydraulic cylinder 73 is directly connected to the movable cam,
There is a case where the groove width reduction of the driven split pulley 14 does not follow the expansion of the groove width of the drive split pulley 14 like in the system in which the movable cam 74b rotates in conjunction with it, and the transmission is not interrupted. It can be decelerated without difficulty. In addition,
The hydraulic cylinder 73 described as the reciprocating operation means may be changed to a manual operation means.

Further, the tubular body 105 controls the operation of the hydraulic cylinder 73 by the movable cam 74b.
Since it covers the joint between the fixed cam 74a and the movable cam 74b while being a means for transmitting to the movable cam or a drive mechanism for the feedback mechanism, it is possible to prevent dirt and various debris from entering the joint surface. Can be slid accurately according to the amount of rotation.

Next, the operation system of the side clutch and the side brake will be explained. The tip end side of the operation rod 113 connected to the brake pedal 112 is loosely fitted to the pipe 115 fixed to the receiving member 114 integral with the tubular body 105 with a pin. , The intermediate portion is rotatably connected to a link 116 having an inverted V shape in a side view by a pin 116a, and when returning the main gear shift lever 71 from a desired gear shift position to the neutral position, the pipe 115 is on the front side of the neutral position. Has an operating rod 113
The receiving nut 113a fixed to the right side is moved to the right side in FIG. 1 (a), whereby the link 116 is rotated in the clockwise direction. A cam 117 for connecting and disconnecting the main clutch 17 is attached, and the other end is provided with a fulcrum pin 118 on the front surface of the mission case 10.
It is superposed on one end upper surface of the balance arm 119 pivotally supported by. The lower ends 121, 121 of the shifter shafts 120, 120 of the shifters 57, 58 for moving the clutch gears 48, 50 to the left and right are respectively screwed and fixed to the outer ends of the lower arms 121, 121.
The other ends of the upper arms 122, 122 pivotally attached to their outer ends are pivotally attached to the tubular body 123 so as to form a pantograph shape as a whole, and a coil spring 124 stronger than the return spring attached to the clutch gears 48, 50. The center rod 125, which is a bolt inserted into the cylindrical body 123 and inserted from below, is connected to the other end of the balance arm 119.

Therefore, when the brake pedal 112 is stepped on, the main clutch 17 is disengaged first, the transmission is cut off, and the link 116 rotates clockwise in FIG. 4, so that the outer end thereof pushes down one end of the balance arm 119. , This raises the center rod 125, and the clutch gear 48, 50
When the brake is cut and further depressed, the side brakes 51 and 52 stop the axle 30 through the braking process. Further, the coil spring 124 absorbs when the discs of the side brakes 51, 52 are worn, and the left and right ones can be adjusted simultaneously by the nut 126 when adjusting the brake pressure. Reference numeral 127 is a pin protruding from the lower arms 121, 121 in a standing posture, and when the operation panel 4 is provided with a pair of left and right side clutch levers, these levers are connected via a link.

In the above-described combine, the non-working posture in which the lock shaft 67 is rotated to retract the lowering stopper 69 and the rising stopper 70 out of the ascending / descending locus of the ram 65a and the protrusion 65b protruding from the ram 65a during work or on the road. Then, when the forward / reverse shift clutch 36 is moved left / right by tilting the main speed change lever 71 left / right at the neutral position, it switches to forward or reverse, and the continuously variable transmission moves forward when the main speed change lever 71 is tilted forward from the neutral position. If the sub gear shift lever 41 moves the sub gear shift gear 41 to the left or right, the gear shifts to high speed, medium speed, or low speed by increasing the speed or tilting backward.

Also, tilt the operating lever 59 to the left to turn the steering valve.
62 switches so as to pump the hydraulic oil from the pump 63 to the left oil chamber 60, whereby the spool 53 slides to the right,
The flange 55 on that side is a shifter pivotally supported in the middle.
Since the upper part of 57 is tilted to the right, the clutch gear on the left side
When 48 is broken, the aircraft gently turns to the left in this state, and when the shifter 57 is further tilted, the side brake 51 operates and the aircraft makes a sharp turn to the left.

When turning the machine body to the right, if the operating lever 59 is tilted to the right, the spool 53 slides in the opposite direction to that described above, so the machine body turns to the right.

Furthermore, when adjusting the cutting height, when rotating the aircraft,
Alternatively, when the pretreatment device 7 is moved up and down while traveling on the road, the ram of the up-and-down valve 65 is tilted by tilting the operation lever 59 backward.
65a is pushed down, hydraulic oil from the pump 63 is pumped to the hydraulic cylinder 6a for lifting and lowering, and the pretreatment device 7 rises and tilts forward, so that the ram 65a is pulled up and the hydraulic oil in the hydraulic cylinder 6a is removed. The pretreatment device 7 is pressed out to the tank by its own weight, and the pretreatment device 7 descends. The operating lever
When you release your hand from 59, it returns to the neutral position by the return spring.

The combine transmission system will be explained with reference to FIG.
8 is an engine, 129 is a first blower fan, 130 is a swing sorting body, 131 is a handling cylinder, 132 is a processing cylinder, 133 is a feed chain, 1
34 is a straw conveying chain, 135 is the first transfer spiral, 136 is the first butt shell spiral, 137 is the second blower fan, 138 is the second transfer spiral, 13
9 is the second reduction spiral, 140 is a suction dust removal fan, 141 is a cutter, 142 is a cutting blade, 143 is a grain culm pulling chain, 144 is a rake belt with lugs, 145 is a scraping ring, and 146 is a harvested culm. The stock-source transport chain for transporting and supplying to the threshing device, 147 is the same-ear side transport chain, 148 in FIG. 10 is a hydraulic lever, 149 is a threshing clutch lever, and 150 is a reaping clutch lever.

(G) Effect of the invention Since the invention is constructed as described above, the reciprocating operation means 73
Is operated to one side, the connecting plate 105b integrated with the cylindrical body 105
Comes into contact with a receiving member 74d that is integral with the movable cam 74b, and the movable cam 74b
By rotating b, the drive split pulley 14 is actuated so as to reduce its groove width, and thereby the other driven split pulley 18 expands the groove width against the ammunition 18a via the V-belt. In this way, the belt continuously variable transmission can be shifted to the speed increasing side. Conversely, when the reciprocating operation means 73 is operated to the other side, the connecting plate 105b separates from the receiving member 74d and the drive split pulley is operated. The groove width of the drive split pulley 14 is increased because the groove width of the drive split pulley 14 is expanded, and when the other driven split pulley 18 is actuated by the bullet 18a so as to reduce the groove width. The belt continuously variable transmission can be smoothly shifted to the deceleration side without breaking the transmission.

Further, since the cylindrical body 105 covers the joint portion between the fixed cam 74a and the movable cam 74b, debris such as mud, weeds, or straw debris does not enter the joint portion, and an accurate gear change can be performed. At the same time, it is possible to prevent the joint surface of the cam from being worn.

[Brief description of drawings]

The drawings show an example in which the present invention is applied to a combine as an example of a vehicle. Fig. 1 (a) is a side view in which a part of a mission is cut away, and Fig. 1 (b) is a partial sectional view of the same. ,
2 is a developed sectional view of a rear portion and a front portion of the same, FIG. 3 is a longitudinal sectional view of an upper portion of the same, FIG. 4 is a left sectional view of the same as above, FIG. 5 is an exploded perspective view of a speed change operation system, and FIG. Hydraulic circuit diagram, FIG. 7 is a cross-sectional view of the upper part of the operation panel, FIG. 8 (a) is a perspective view of a lifting lock device, FIG. 8 (b) is a front view of the same, and FIG. 9 (a) is a lock state of the same. FIG. 10B is a front view showing the same as FIG.
Figure is a plan view of the driving section, Figure 11 is a right side view of the combine,
FIG. 12 is a left side view with the rear part thereof omitted, and FIG. 13 is a transmission system diagram of an example in which the present invention is applied to a combine. 14 …… Drive split pulley 18 …… Driven pulley 18a …… Ammunit 73 …… Reciprocating means 74a …… Fixed cam 74b …… Movable cam 74d …… Receiving member 105 …… Cylinder 105b …… Connecting plate

Claims (1)

(57) [Scope of utility model registration request] 1. A movable cam (74b) which winds a V-belt between a drive split pulley (14) and a driven split pulley (18) and which is joined to a fixed cam (74a) provided on the drive split pulley side.
Driven by the reciprocating operation means and drive split pulley (14)
While the groove width of the driven split pulley (18) can be operated at least in the direction of reducing the groove width, the ammunition (18a) provided on the driven split pulley side urges in the direction of reducing the groove width of the driven split pulley (18) to shift gears. In a belt type continuously variable transmission, a cylindrical body (105) is rotatably fitted to an outer periphery of the fixed cam (74a) to cover a joint portion of both cams (74a) and (74b), and the cylindrical body. A connecting plate (105b) protruding from the (105) is connected to the reciprocating operation means (73), and a receiving member (74d) integrated with the movable cam (74b) is provided opposite the connecting plate (105b). The receiving member (74d) is connected to the connecting plate (105d) by the rotation of the connecting plate (105b) accompanying the operation of the reciprocating operation means (73) to one side.
b), thereby actuating the movable cam (74b) in the direction in which the groove width of the drive split pulley (14) is reduced, and the connecting plate accompanying the actuation of the reciprocating actuating means (73) to the other side. (Ten
5b) releases the interlock between the receiving member (74d) and the connecting plate (105b), and the groove width of the driven split pulley (18) is adjusted by the urging force of the ammunition machine (18a) provided on the driven split pulley side. A belt type continuously variable transmission characterized in that the groove width of the drive split pulley (14) is enlarged while being reduced.