JP2899259B2 - Continuously variable transmission - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission belt
By changing the diameter of each pulley of the pair of variable pulleys,
Stepless change in rice transplanter with variable gear ratio between both pulleys
It relates to a speed device. 2. Description of the Related Art Conventionally, a continuously variable transmission in a rice transplanter has been known.
Uses a pulley type transmission, and this transmission
Is, for example, a pair of rotating shafts
Each pair of variable pulleys (drive and driven pulleys)
And each of the pulleys is integrally rotatable with a rotating shaft and
A fixed split pulley that is fixed so that it cannot slide
The fixed split pulley is supported slidably on the body and
Belt with a V-shaped cross section around which the transmission belt is wound
It consists of a movable split pulley that forms a groove.
The pulley diameter (belt groove)
By changing the effective radius of
Changed the speed ratio from low speed to high speed
Things. By the way, rice transplanters plant rice.
Sometimes running at a constant speed and planting rice at a constant pitch
Performance is required. However, the pulley type transmission described above
In addition, the movable split pulley of the variable pulley is
When a rice transplanter with a structure that drives
The underbody load changes according to the viscosity of
The gear ratio fluctuates due to the bite of the
As a result, it becomes difficult to plant rice at an equal pitch. [0003] To solve these problems, the transmission ratio
Drive or slave so that the
Use a cam with a movable pulley or a movable split pulley for both pulleys.
The belt tension is controlled by the tension
Is given. For example,
In what is disclosed in JP-A-164352,
Direction of one variable pulley to movable split pulley and the other
Of movable split pulley to fixed split pulley
The direction of the pulley is opposite to that of each pulley.
On the rear side, a rotating cam that can rotate around the rotation axis,
It consists of a fixed cam that is connected to the fixed body and cannot rotate.
The movable cam is rotated by the relative rotation of the rotating cam and the fixed cam.
Cam to move the tool closer to the fixed split pulley
And the rotating cams of both cam mechanisms are connected to a rod and a transmission shaft.
To connect one of the drive and driven pulleys.
Moving split pulley approaches fixed split pulley facing it
And a fixed split pulley with the other movable split pulley facing it
The rotating cams of both cam mechanisms are connected to each other
And rotate each pulley to the effective half with respect to the belt member.
Change the gear ratio between both rotating shafts by changing the diameter
Has become. [0004] In this proposal,
The rotating cams of both cam mechanisms are connected so as to be interlocked with each other.
Therefore, when shifting between the two rotating shafts, the operation of the shifting mechanism is performed.
The movable split pulleys of the drive and driven pulleys
Open and close synchronously in the opposite direction to the opening between the driving and driven pulleys.
The closing forces partially cancel each other, and the gearshift between the two rotating shafts
The replacement can be performed promptly with a small operation force. I
However, in practice, the bearing that supports the rotating cam is movable.
The desired effect is obtained from the point of contact with the boss tip of the pulley.
When there is no result, for example, in an emergency, respond quickly
There is a problem that can not be. That is, the movable split pulley
That it received thrust from the belt hung on almost half of it
To make the movable split pulley tilt with respect to the rotation axis
Bearings that support the rotating cam
Is in contact with the tip of the boss of the movable split pulley.
The part is received by the bearing at the tip
Therefore, the moment is large and the movable split pulley
Pressure Distribution in the Axial Direction of the Inner Periphery of the Boss to the Rotation Shaft
Are concentrated with a large peak, and the sliding resistance of the boss
growing. For this reason, the rotating cams of both cam mechanisms are connected to each other.
And extract the thrust generated by the belt of one cam mechanism to
Although it is used for the belt thrust of the cam mechanism,
Large operating force for shifting operation due to large sliding resistance
In short, the gear ratio between both rotating shafts can be smoothly changed with a small operating force
It is difficult to switch. In addition, the rotating cam and the fixed cam
Contact with the cam surface, the sliding resistance is large.
This also causes an increase in the speed change operation force. I
Because the cam surface has a large resistance, it wears quickly,
Increases the accuracy of pulley positioning
In addition, the sliding resistance further increases. Therefore, the cam slide
Lubrication oil maintenance is essential to keep dynamic resistance low
And management is troublesome and insufficient in terms of practicality.
Was. Furthermore, since the fixed cam is fixed to the fuselage,
It is difficult to make a relative adjustment between the cam and the fixed cam. The present invention is such
It was made in view of the point, and the purpose
Is connected to the above-mentioned cam mechanism and its movable split pulley.
By improving the structure, the operation of the transmission mechanism is small.
It can be performed smoothly by force, so that due to load fluctuation
The disadvantage of preventing the change of gear ratio by cam mechanism
Try to eliminate a certain increase in operating force, and
An object of the present invention is to facilitate adjustment of a relative relationship with a rotating cam. SUMMARY OF THE INVENTION The present invention is directed to
In order to achieve the target, continuously variable transmission in rice transplanters such as
An apparatus is provided. That is, they are arranged parallel to each other.
A pair of rotating shafts (24) and (29)
(24) In (29), it is impossible to move integrally with the rotation and axially.
Fixed fixed split pulley (25a) (27a)
Boss that is rotatable and movable on the pivots (24) and (29)
(65), (68) and the fixed split
V-shaped bell between pulleys (25a) and (27a)
Movable pulley (2) forming the groove (25c) (27c)
5b) A pair of variable pulleys (25) consisting of (27b)
(27) and belt grooves of the variable pulleys (25) and (27).
(25c) Power transmission belt wound between (27c)
(26) and the movable pulleys (25) and (27) are movable.
The split pulley (25b) (27b) is fixed to the split pulley (25
a) A variable pulley (25) which is brought into contact with and separated from (27a).
(27) A pair of cam mechanisms (A) for changing the pulley diameter
(B) and the pulleys of the variable pulleys (25) and (27).
The two cam mechanisms so that the diameters change in opposite directions.
(A) and (B) are linked to each other, and between both rotating shafts (24) and (29).
And a speed changeover mechanism (C) for changing the speed ratio of the motor.
Each of the cam mechanisms (A) and (B) has a variable pulley (2
5) Same as the movable split pulley (25b) (27b) of (27)
The rotating shaft (2) is placed on the bosses (65) (68) that rotate around the body.
4) Bearing (64) (67) perpendicular to (29)
Rotatably supported with a recess that fits integrally with the boss
Movable split pulley side cams (42) and (48)
(42) The cam comes into contact with (48), and each rotating shaft (2
4) Support (29) via bearings (63) and (66).
Rotating cams (43) and (44).
The movable split pulley (2)
5b) (27b) is configured to be moved in the axial direction.
The speed changeover mechanism (C) includes a rotating shaft (24) (2)
A connecting member (43) extending substantially parallel to a plane orthogonal to (9).
a) (44a) and movable cam mechanism of the other variable pulley
The split pulley side cam and the movable split of both cam mechanisms (A) and (B)
(25b) and (27b) are the rotation axes (24) (2
9) Linking link for linking and rotating around
(45), (46), and (47).
5) (46) and (47) are movable split pulley side cams (42)
Rotating cams (43) and (44) in contact with (48)
From the connection link (45) to the left and right connection links (46) (4)
7) to be rotated in opposite directions via
Continuously variable transmission in rice transplanter characterized by comprising
It is. The speed ratio between the two rotating shafts (24) and (29) is switched.
Each pulley (25), each cam mechanism of (27)
(A) The rotating cams (43) and (44) in (B)
From one operating rod (45) and arms (46) (47)
Are connected so as to be interlocked with each other by a speed change mechanism (C).
Therefore, the cam of one variable pulley (25) or (27)
The rotating cams (43) and (44) of the mechanisms (A) and (B) are
(24) or (29).
Possible by cam contact with the reel side cam (42) or (48)
The movable split pulley (25) of the variable pulley (25) or (27)
When b) or (27b) is moved in the axial direction,
The other movable split pulley (27b) or (25b)
Movable on one of the variable pulleys (25) or (27)
Split pulley (25b) or (27b) fixed split pulley (2
The operation opposite to the contact / separation operation for 5a) or (27a)
The movable split pulley (25b) (27)
The two rotation shafts (24) and (29) are moved by the movement in the opposite direction of b).
Is changed. An embodiment shown in the drawings will be described below.
First, the whole riding type rice transplanter will be described.
(1) is a passenger body, and a rear part of the passenger body (1)
The planting section (3) is connected via the lift mechanism (2).
You. The engine (5) is mounted on the body frame (4)
And there is a front wheel (6) below it. (7) is
The transmission case from the left and right sides of the transmission case
There is a rear wheel (9) at the rear end of the transmission case (8).
There is. (10) is a driver's seat, (11) is a footrest,
(12) is a steering wheel. Lift mechanism
(2) Top link (13) of link frame
A warlink (14) is installed and a hydraulic syringe
The links (13) and (14) are swung by the expansion and contraction of the
The planting section (3) is raised and lowered. Planting department
(3) Seedling stand (15), float (16), transmission cable
(17). (18) is a rotor
(19) shows a planting arm. [0009] The transmission device in the rice transplanter as described above is illustrated.
Explaining on the basis of No. 4, pulley from engine (5)
The pulley (22) is driven via (20) and the belt (21).
And the hydraulic pump (23) is driven. This hydraulic port
The pump (23) sends hydraulic oil to the elevating part of the planting part, etc.
is there. A split pulley is provided on the rotation shaft (24) of the pulley (22).
(25) is provided, and the belt (26)
The split pulley (27) is driven via this. Split pulley (2
7) is also a transmission case via the main clutch (28).
The rotation shaft (29) and the shaft (30) are moved by the gear mechanism in the gear (7).
Drive. This shaft (30) is a planting drive shaft.
It is driven by the gear mechanism in the transmission case (7).
Gear (31) drives the propeller shaft (32),
Front wheels via differential gear mechanisms (33) (34) in the case
(6) and the rear wheel (9) are driven. (35) is rear wheel drive
Gear mechanism in a transmission case (8) for use in a vehicle. Note that (3
6) and (37) are front and rear axles, respectively. Next, a cam mechanism characterized by the present invention and its cam mechanism
Continuously variable transmission with improved connection structure for movable split pulley
The configuration will be described with reference to FIG.
One fixed split pulley (25) of the split pulley (25)
a) is provided with a seedling connecting clutch (38), shown in FIG.
Do not use the seedling clutch lever provided on the operation column.
Forced release of fixed split pulley (25a) by operation
To position the bearing (39) on the rotating shaft (24)
The belt (26) can be dropped to stop the drive.
It has become so. Fixed split pulley (25a) is split
(41), the other movable split
The pulley (25b) has a bearing (6) on the rotating shaft (24).
3) a cam that engages with a rotating cam (43) that rotates via
A movable split pulley side cam (42) having a sliding surface (62)
It is supported and is movable by the rotation of the rotation cam (43).
The movable split pulley (25b) together with the pulley side cam (42)
Moving. And the boss portion of the movable split pulley (25b)
(65) Movable split pulley side via bearing (64)
The cam (42) is supported to form a moving cam. [0011] From the above, the seedling connecting clutch (38)
When not operating, the split pulley (25a) is a fixed split pulley.
Therefore, the rotary shaft (24) is integrally rotatable and axially
Split pulley (25a) supported to be immovable in the direction
The rotary shaft (24) is rotatable integrally and axially movable.
(65) and fixed split pulley (2
5a) and V-shaped belt groove (25c)
Variable pulley (25b)
(25) is constituted. In addition, the variable pulley (2
5) The movable split pulley (25b) is replaced with the fixed split pulley (25).
a) Pull the diameter of the variable pulley (25)
The cam mechanism (A) to be changed is a movable split pulley side cam (4
2) and a rotating cam (43). On the other hand, a rotating shaft (29) which is a driven shaft has
Also, there is a rotating cam (44), and the rotating cam (43)
Both main clutch petals (operation independent of the seedling clutch)
Arm (46) of the operating rod (45) interlocking with the implement)
(47) and operated by levers (43a) and (44a)
You. In this case, the arms (46) and (47) and the lever (4)
3a) and (44a) rotate with pins (71) and (72)
Freely connected. And arms (46), (47)
The rotation cams (43) and (44) are rotated by the
It does not move in the directions of the pivots (24) and (29). Operating rod (4
5) is also interlocked with the planting section elevating lever. Therefore,
Shifting operation during planting work with the lifting lever
Can be. The sliding cam surface (7) engaging with the rotating cam (44)
The movable split pulley cam (48) having 0) is a split pulley.
(27) A switch for urging one of the movable split pulleys (27b).
Fit the boss (68) of the metal fitting (51) of the pulling (50).
It is supported via the ring (67). Rotary axis (2
A key (53) is provided on the outer fitting pipe (52) of 9),
As a result, the movable split pulley (27b) and the outer fitting pipe (52) are
Swivels around the body. Also, the other fixed split of the split pulley (27)
The pulley (27a) has a case cover (54).
There is a main clutch (28) in the transmission case
Power is transmitted to (7). Therefore, like a seedling clutch lever.
Forcible movable split pulley (25a)
Operate in the direction of separation, and move the bearing (3) on the rotating shaft (24).
9) Drop the belt (26) to the position and stop driving.
On the other hand, on the other hand, stepping on the main clutch petal
Depending on the operation, the rotating cam (43) via the operating rod (45),
Operate (44) to transfer power to mission case (7).
The cam can be shifted to the low speed side with the cut.
You. From the above, starting always starts from the low speed side
be able to. And a transmission bell is sent from the split pulley (25).
The split pulley (27) driven by the
-(54) via the main clutch (28) and the rotating shaft (2).
9) is driven. Therefore, the rotation shaft (29)
Fixed split pulley (27a) which is fixed via a hook (28)
And can be axially moved integrally with the rotating shaft (29).
And a fixed split pulley supported by the boss (69)
(27a) and a belt groove (27c) having a V-shaped cross section.
The variable pulley (2) is formed with the movable split pulley (27b) to be formed.
7) is configured. The variable pulley (27)
Movable split pulley (27b) to fixed split pulley (27a)
The pulley diameter of the variable pulley (27)
The cam mechanism (B) to be driven includes a variable pulley (27b) and a split
Metal fittings (51) that rotate together through the ring (50)
On boss (68) of bearing via bearing (67)
A movable split pulley side cam (48) movably supported,
And a rotating cam (44) that comes into contact with the cam (48).
ing. The rotating cam (44) has a cam sliding surface (70).
The movable split pulley side cam (48) is in contact with the operating rod (4
5) The arm (47) is made immovable in the axial direction, and
So that it can rotate relative to the external fitting pipe (52).
There are bearings (66). The spring (50)
Turns the movable split pulley (27b) and the receiving bracket (51) together.
To reduce the transmission of vibration between variable pulleys
Can be. That is, when the vibration system of the variable pulley is different
The vibration of the engine on the mount
Is transmitted to the transmission mechanism of the driven pulley on the
The moving pulley and the driven pulley exhibit different movements, and the pulley
The gear ratio does not stabilize to a steady state by opening and closing, and as a result,
Re-sliding parts are worn out early, or belts
The amount of heat generated increases, and the durability decreases.
There's a problem. However, the spring (50) as described above
Is used when the vibration systems of both variable pulleys are different.
The transmission of vibration between both variable pulleys
0), and a steady-state pooh
The gear ratio can be stably maintained without opening and closing the
Prevents early wear of sliding parts
At the same time, the belt is prevented from moving in the pulley
Heat generation can be suppressed, and the durability thereof can be improved. By the way, the operating rod (45) and the arm
(46) and (47) are split pulleys (25), (27),
That is, the pulley diameters of the two variable pulleys (25) and (27) are
The cam mechanisms (A) and (B) are connected so that they change in the opposite direction.
To change the gear ratio between both rotating shafts (24) and (29)
But the rotation axes (24) arranged in parallel with each other,
A connecting member extending substantially parallel to a plane orthogonal to (29)
Levers (43a) and (44a) and both movable split pulleys
The cams (42) and (48) are connected to the rotation shafts (24) and (2).
9) an arm which is connected so as to rotate around the link
(46), (47) and the operating rod (45)
The speed changeover mechanism (C) is constituted by the connecting link. Both
When switching the gear ratio between the rotating shafts (24) and (29)
Each pulley (25), each cam mechanism of (27)
Rotating cams (43) and (44) in (A) and (B)
The speed changer having one connecting link as described above
Because it is linked so that it can be linked by the structure (C),
Cam mechanism (A) of pulley (25) or (27) or
The rotating cam (43) or (44) of FIG.
4) Rotate around (29) and move the movable pulley
Pooh due to cam contact with the rear cam (42) or (48)
(25) or (27) of the movable split pulley (25b) or
When (27b) is moved in the axial direction, the cam sliding surface (6
Since 2) and (70) are formed in opposite directions,
The other pulley (27) or (25) moves accordingly
The split pulley (27b) or (25b) has one pulley (2
5) or (27) the movable split pulley (25b) or
To the fixed split pulley (25a) or (27a) of (27b)
Moves in the opposite direction to the approaching / separating operation.
Movement of the split pulleys (25b) and (27b) in the opposite direction
Change the gear ratio between the two rotating shafts (24) and (29)
Is done. That is, the movable split pulley of the pulley (25)
(25b) approach the fixed split pulley (25a), and
Movable split pulley (27b) of pulley (27) Fixed split pulley
Pulley (25) when separated from the rib (27a).
By making the pulley diameter larger than the pulley (27).
To increase the rotation of the rotation shaft (24) to the rotation shaft (29).
Can be transmitted. On the other hand, the pulley (25)
Separate moving split pulley (25b) from fixed split pulley (25a).
Movable pulley (27b) for separating and pulley (27)
When approaching the fixed split pulley (27a),
Reducing the diameter of the pulley (25) and pulling the pulley (27)
By increasing the re-diameter, the rotation of the rotating shaft (24)
The speed can be reduced and transmitted to the rotating shaft (29). More than
In such a case, the opening and closing force between the variable pulleys (25) and (27)
Is reversed, and the opening and closing force between both pulleys (25) and (27)
So that the two cam mechanisms (A) partially cancel each other out,
The rotation cams (43) and (44) of FIG.
Linked by links (45), (46), (47)
Will be. And it is possible by the cam mechanisms (A) and (B).
Since the split pulleys (25b) and (27b) are driven,
Firmly fix the open / close position of the tools (25) and (27).
Therefore, even if load fluctuations occur,
Can be kept constant. Therefore, the traveling speed of the rice transplanter
Degree is constant irrespective of mud condition of field, that is, underbody load
The rice can be planted at a constant pitch. The rotary cam (43) and the movable split as described above
Pulley side cam (42), rotating cam (44) and movable split
Upper and lower overlapping cams such as the pulley side cam (48)
Re-operation cam, but the cam sliding surface of split pulley operation cam
(62) and (70) show that when the cam is turned, the turning resistance is reduced.
As a result, the operating force of the levers (43a) and (44a) is large.
It will be good. Therefore, the cam sliding surface of the split pulley operation cam (6)
2) Ball and thrust bearing on the sliding part of (70)
And an operation force reducing member for reducing sliding resistance is provided.
In FIG. 2, the ball (55) is connected to the sliding portions (62), (7).
0), one of the cams has a tear groove (56)
And the other cam is provided with a hemispherical groove (57).
Is shown. When the operation force reducing member as described above is provided,
Since the sliding resistance is greatly reduced, the operating force must be reduced.
The gear shifting operation is performed smoothly,
To maintain stable stability throughout the entire period and eliminate the need for lubrication oil maintenance.
Can be. In any case, the speed changeover mechanism (C) has one
Since it has a straight rod-shaped connecting link,
The link is used to rotate the two cam mechanisms (A) and (B).
(43) and (44) can be connected with high rigidity,
Power is transmitted without waste, and the loss can be reduced.
Wear. Also, the connecting link is one cam mechanism (A) or
The extraction thrust of (B) is applied to the other cam mechanism (B) or (A).
It is possible to transmit efficiently and reduce the shifting operation force.
Can be. From the above, the rice transplanter of the present invention
The continuously variable transmission has a pair of rotating shafts arranged in parallel with each other.
(24), (29) and the rotation shafts (24), (29)
Fixed split pulley fixed to be rollable and axially immovable
(25a), (27a) and the rotating shafts (24), (2
The bosses (65) and (6) are rotatable and movable integrally with 9).
8) and the fixed split pulley (25
a), (27a) and a belt groove (25) having a V-shaped cross section.
c), a movable split pulley (25b) forming (27c),
(27b) a pair of variable pulleys (25), (2)
7) and belt grooves of the variable pulleys (25) and (27).
(25c) Transmission belt wound between (27c)
(26) and the variable pulleys (25) and (27)
The moving split pulleys (25b) and (27b) are fixed fixed pulleys (2
5a) and (27a), the variable pulley (2
5) and (27) a pair of cam mechanisms for changing the pulley diameter
(A), (B) and the two variable pulleys (25), (2)
7) so that the pulley diameters change in opposite directions.
By interlocking the cam mechanisms (A) and (B), both rotating shafts (2
4), a speed changeover mechanism for changing the speed ratio between (29)
(C), and each of the cam mechanisms (A), (B)
Is the movable split pulley (25) of the variable pulleys (25) and (27).
b) a boss (65) that rotates integrally with (27b);
(68) is perpendicular to the axis of rotation (24) (29) and bears
Recesses integrally fitted to bosses of rings (64) and (67)
Movable split pulley cam rotatably supported with a section
(42) and (48) and the cams (42) and (48)
Contact with the rotating shafts (24) and (29)
Supported via bearings (63) and (66), respectively
Rotating cams (43) and (44).
By the relative rotation of 3) and (44), the movable split pulley (25
b) and (27b) are configured to move in the axial direction.
And the speed change mechanism (C) includes rotating shafts (24), (2)
A connecting member (43) extending substantially parallel to a plane orthogonal to (9).
a), (44a) and the other variable pulley cam mechanism
Both cam mechanisms (A) and (B) are movable with the split pulley side cam.
The split pulleys (25b) and (27b) are
4), (29) linked to rotate around
Connecting links (45), (46) and (47),
Connecting links (45), (46) and (47) are movable split
The rotating cam (4) that comes into contact with the rear cams (42) and (48)
3) and (44) are connected from the central link (45) to the left and right links.
Turns in opposite directions to each other via the connecting links (46) and (47).
Characterized in that it is configured to move
It is. According to the present invention, the movable split of the variable pulley
To the fixed split pulley to adjust the diameter of the variable pulley.
A pair of cam mechanisms to be changed and the pulley diameter of both variable pulleys
And both cam mechanisms are linked so that
And a speed change mechanism for changing the speed ratio between the two rotating shafts.
On the boss that rotates together with the movable split pulley.
Movable split pulley rotatably supported via an ring
The cam and the cam come into contact with the cam and
Relative to the rotating cam supported
Tool is moved in the axial direction.
The movable split pulley of each pulley is driven by the rotating cam
That is, to firmly fix the open / close position of the pulley
Therefore, even if a load change occurs, the gear ratio of the transmission is reduced.
Can be kept constant. Therefore, the traveling speed of the rice transplanter
Degree is constant irrespective of mud condition of field, that is, underbody load
The rice can be planted at equal pitch. Also possible
Has an action surface that pushes the cam surface on the split pulley side in the axial direction.
As a thing, the cam and the boss of the bearing are integrated,
Since it was formed in a ring shape with a short length in the axial direction,
To the boss directly through the bearings.
And a smooth movement without "tear" or the like. Ma
The movable split pulley on both pulleys is
Since it is moved in the axial direction by mechanical driving by
The opening and closing forces between the driving and driven pulleys are reversed,
Since the opening and closing force between the parts partially cancel each other,
It can be light. In addition, the movable split pulley side cam is a movable split pulley.
Move axially through bearings around the outer periphery of the boss
And is rotatably supported, and
The rotating cam that comes into contact with the
The movable split pulley cam and the rotating cam are
By enabling relative rotation, the operating force of the link
Is lighter and smoother operation is possible.
In addition, the movable split pulley cam and the rotating cam
It is not fixed on the body, so it is easy to adjust the relative relationship.
You. In addition, one straight rod-shaped connecting ring in the speed changeover mechanism.
Rotating cam in the cam mechanism of both variable pulleys
By connecting them with high rigidity, the operating force is transmitted without waste,
Efficiently transmits the extraction thrust of one cam mechanism to another cam mechanism
Can greatly reduce the shifting operation force, in emergency
Quick response. In addition, linking is possible
Rotating cam that comes into contact with the split pulley cam is connected to the center link.
From each other via the left and right connecting links
Operation of central link
The force is transmitted equally to the left and right rotation cams, and the rotation cams are
In the direction of rotation.
Notable, such as offsetting each other and reducing operating force
It has a great effect.

[Brief description of the drawings] FIG. 1 is a sectional view of a transmission according to the present invention. FIGS. 2A and 2B are a plan view and a sectional view of a cam sliding portion. [Fig. 3] Overall view of rice transplanter FIG. 4 is an explanatory view of a transmission device. [Explanation of symbols] 7 Missions 24 Drive shaft (rotary shaft) 25% pulley (variable pulley) 26 belt 27 split pulley (variable pulley) 28 main clutch 29 Driven axis (rotary axis) 42 Movable split pulley side cam 43 Rotating cam 44 Rotating cam 45 Operating rod 46 arm 47 arm 48 Movable split pulley side cam 63 bearing 64 bearing 65 Boss 66 Bearing 67 bearing 68 Boss

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 57-82240 (JP, U) JP-A 55-132544 (JP, U) JP-A 60-2054 (JP, U) JP 38-J 3213 (JP, Y1) (58) Field surveyed (Int. Cl. ⁶ , DB name) F16H 9/00-9/26

Claims (1)

(57) [Claims] A pair of rotating shafts (24) (2)
9) and a fixed split pulley (25a) fixed to the rotary shafts (24) and (29) so as to be integrally rotatable and immovable in the axial direction.
Ru is supported by (27a) and said rotary shaft (24) and to rotate in unison therewith (29) movably boss (65) (68)
Said fixed split pulley with (25a) V-shaped belt groove between the (2 7a) (25c) movable split pulley to form a (27c) (25b) pair of variable pulleys consisting of (27b) (25) (27) and the variable pulley (25)
The transmission belt (26) wound between the belt grooves (25c) and (27c) of (27) and the respective variable pulleys (2
5) A pair of cam mechanisms (27) for changing the pulley diameter of the variable pulleys (25) and (27) by moving the movable split pulleys (25b) and (27b) of (27) toward and away from the fixed split pulleys (25a) and (27a). A) and (B) and the two variable pulleys (25)
The two cam mechanisms (A) and (B) are linked to each other so that the pulley diameter of (27) changes in the opposite direction.
4) a speed changeover mechanism (C) for changing the speed ratio between (29) and (c), and each of the cam mechanisms (A) and (B)
Are movable split pulleys (25) of the variable pulleys (25) and (27).
b) The boss portion (65) (6) that rotates integrally with (27b)
8) A movable split pulley-side cam (42) which is rotatably supported on its upper side with a recess perpendicular to the rotating shafts (24) and (29) and integrally fitted to the bosses of the bearings (64) (67) )
And (48), the cam (42) (48) to the cam contact
Both bearings (63) on each rotating shaft (24) (29)
Rotating cam (43) (44) supported via (66 )
And the movable split pulleys (25b) and (27b) are moved in the axial direction by the relative rotation of the two rotary cams (43) and (44). A connecting mechanism (43a) (44a) extending substantially parallel to a plane orthogonal to the shafts (24) and (29) and a movable split pulley side cam of the other variable pulley cam mechanism are both cam mechanisms (A).
(B) has connection links (45), (46), and (47) for connecting the movable split pulleys (25b) and (27b) to rotate about the rotation shafts (24) and (29). The connecting links (45), (46), (47) are in contact with the movable split pulley cams (42), (48).
4. A continuously variable transmission in a rice transplanter , characterized in that 4) is configured to rotate in opposite directions from a central connecting link (45) via left and right connecting links (46) and (47).