JPS62228744A - Power gearing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates generally to power transmission devices, and more particularly to continuously variable mechanical power transmission devices.

A typical prior art mechanical transmission is a sliding gear (standard) transmission. This standard transmission device is
The ratio between the input speed and the output speed is changed in steps by manually changing the gears. Power supplies typically provide good economy and power performance only over a narrow speed range. Therefore, a large number of gear changes are required to obtain good operating conditions. As an illustration of this, some trucks have many gears for forward movement.

In addition to the standard power transmissions mentioned above, certain continuously variable mechanical power transmissions are known.

One such device is disclosed by Essler, US Pat. No. 1,401.538.

In the Kessler patent, a lever is pivotally coupled at one end to a support;
At the other end, it is connected to the drive rod, so that
The reciprocating movement of the drive rod causes the lever to swing.

One output lot is provided, which further includes:
It is mounted midway between its ends so that it can slide on a lever. When the lever support moves up and down, the lever slides relative to the output shaft. This movement of the support changes the output of the power transmission by adjusting the distance of movement of the output shaft resulting from the vibration of the lever.

Another prior art transmission device is shown in Prouty US Pat. No. 491.759. In the Prouty patent, the drive rod is pivoted to one end of a lever that is pivoted to the frame. The output rod is slidably connected at one end to a lever. This one end of the output rod approaches the lever pivot, and
As it slides away, the distance of movement of the output rod changes.

In the Prouty patent, the output rod is connected to a lever so that it slides toward various locations of the lever's position. In other words, it slides from a position aligned with the pivot of the non-powered lever toward a position close to the pivot connecting portion between the drive rod and the lever.

Another known device is shown in U.S. Pat. No. 2,254,195 to C1cin. The C1cin patent includes a drive actuator 1 which provides linear reciprocating motion and is also preferably coupled to one end of a single lever.
Contains books. One end of one output rod is pivotally connected to the other end of the lever. This lever is slidably connected to a pivot about which it swings. This pivot is movable from a position aligned with the output rod, in which case the output rod remains stationary while the input rod is driven to other positions along the lever. It has become. An adjustment mechanism is provided by which the pivot can be repositioned over the entire length of the lever. At the pivot, the lever stress is high. In this way, the lever is provided with complementary measures along its entire length in order to take up a certain amount of load.

By this measure the weight of the lever is increased.

Therefore, although prior art variable transmission systems are known, there is a real need for an improved continuously variable power transmission.

According to the invention, power is transmitted from a reciprocating drive rod to a reciprocating output rod. A power transmission device is disclosed below.

The transmission device comprises a lever support means, a lever means, and a fulcrum means provided at a fixed position between the ends of the lever means for pivoting the lever means relative to the lever support means. Become. One end portion of the lever means is intended for connection with one end portion of the drive rod, whereas the other end portion of said lever is intended for connection with one end portion of the output rod. This is for connecting to get the best results. Furthermore,
Drive adjustment means are provided for shifting the lever support means, whereby said lever means
The input and output rods are mounted to vary the distance of movement of the output rod in response to reciprocating movement of the drive rod relative to the output rod.

As a more specific aspect of this invention, the power transmission device includes:
It has one lever to which one fulcrum is fixed. In addition, for the purpose of adjusting the power transmission device,
Means are provided for moving the entire lever and fulcrum assembly in relation to input and output loads.

It is possible to make this kind of adjustment because:
This is because the input and output loads are slidably coupled to each end of the lever.

In other words, this lever is mounted on and furthermore supported by a fulcrum, so that the lever,
And the fulcrums can both move and thus exert different lever moments relative to the load.

In a further aspect of the invention, the output rod is suitably coupled to the lever such that the lever and fulcrum assembly is moved to a position that is aligned with the axis of the fulcrum and the output rod. The rod aligns the lever with an axis on which it pivots relative to the lever. This arrangement allows the output rod to remain stationary while the input rod is moved.

In another feature of the invention, the lever is constructed with first and second lever portions. Each part is supported by a fulcrum or pivot, each located at a certain spacing, so that the output lot extends between the lever parts, and at each location between each part, the lever part It is possible to connect with As a result of this, the power transmission device is symmetrical with respect to the plane passing through the input and output lots. This reduces vibrations to a minimum, which would be severe if the device did not have such balancing means.

Another feature of the invention is that the lever has a fixed fulcrum and an assembly comprising:
Reinforcement can be applied to provide the highest strength on the lever at or near the fulcrum as the point of highest stress. In this way, the weight of the lever can be reduced completely and the lever can be swung with even higher operating speeds.

Yet another aspect of the invention includes a set of cardioid constant speed cam mechanisms that drive the input or output rod to reciprocate the lever about the fulcrum.

Still other features of the invention allow for the installation of dual assemblies of cams, input rods, output rods, and levers, coupled to a common output shaft, the cams being offset from each other; From the transmission position,
Furthermore - a smooth power output is obtained.

As another aspect of this invention, the output utilization means is 1 m
The reciprocating motion of the output rod is converted into rotational motion of the output shaft.

Illustrating an embodiment of the output mechanism, a dual-way, one-way clutch with a rack and pinion mechanism is provided to convert reciprocating motion of the output rod into rotational motion of the output shaft.

Accordingly, one object of the present invention is to provide an improved power transmission system.

Another object of the present invention is to provide a power transmission device that can perform stepless speed changes over a wide range.

Still another object of the present invention is to provide a set of power transmission devices for converting the rotational motion of a human power shaft into the rotational motion of an output shaft, and in this case, The ratio of the revolutions per minute (r, p, m) to that of the input shaft can be varied over a wide range from 0 to 1 or a number above this.

Another object of the invention is to provide a power transmission system that is capable of providing an O output at the input rpm ratio without the need for a clutch disengagement device.

Still another object of the present invention is to provide a power transmission device in which the vibrations of the device are minimized.

Yet another object of the invention is to provide an apparatus capable of operating at relatively high speeds.

It is a further object of the invention to provide a relatively efficient, reliable, compact and
is to provide a heavy-duty power transmission.

Still another object of the invention is a power transmission device capable of producing high torque output at low output rpm, and in particular a device capable of achieving this even when input power is low. is to provide.

Still another object of the present invention is to provide a power transmission device that can smoothly supply power.

In addition to the above items, other objects, features, and advantages of this invention can be found in the following description,
and the drawings will make it clear.

Referring to FIG. 1 and FIG. 2 of the drawings, a case will be described in which a power transmission device 10 according to the present invention transmits power from a rotatable input shaft 12 to a rotatable output shaft 14. As will be explained below, this power transmission device can steplessly change the rotational speed of the output shaft 14 from 0 to the rotational speed of the input shaft or higher. In addition to this, this axis 14
is rotated in both forward and reverse directions by this power transmission device.

Generally speaking, the device is contained within a housing 16 by which bearing support is provided for input and output shafts 12 and 14. The input shaft 12 is rotated by an electric motor or a prime mover (not shown), thereby driving the cam mechanism 18. This cam mechanism, in turn, imparts reciprocating motion to the drive rod 20. This rod 20
is slidably and pivotally connected to one end of one of the levers of the lever assembly 22. This lever
The assembly is in pivot contact with a lever supporting structure 24 and is thus fixed relative to the lever in response to reciprocating movement of the drive rod 20;
A rocking motion is performed around the fulcrum and pot axis. A first end of the output rod 26 is slidably and pivotally connected to the other end of the lever.

A set of drive speed regulators 28 are provided to move the lever support 24, which in turn moves the lever 22 in response to input and output loads. In other words, the adjustment device 28 adjusts the distance from the fulcrum pivot axis to the first end of the drive rod 20 to the distance from the fulcrum pivot axis to the output rod 26.
The distance to the first end of can be changed steplessly.

As a result of this type of movement, in response to the reciprocating motion of the input rod 20, the reciprocating distance, ie, the distance, that the output rod 26 reciprocates changes steplessly.

Furthermore, the design of the device allows the fulcrum pivot shaft to move into alignment with the first end of the output rod 26. With such positioning, the output port and lever will remain stationary even if the lever is rocking. Furthermore, a set of output conversion mechanisms 32 is provided, including an output port.

In other words, the power transmission device according to the present invention is capable of converting the reciprocating motion of the output shaft 14 into the rotational motion of the output shaft 14 in the forward or reverse direction. The output shaft includes means for continuously varying the speed of the output shaft in response to rotation over a wide range. Alternatively, this can be done by a lever fixed to the fulcrum, which also adjusts the fulcrum lever assembly relative to the input and output loads.
This is done by means of transmitting power.

The cam mechanism 18 includes a pair of laterally spaced, generally cardioid cam portions 34,36.
, which is attached to the shaft 12. Each collar 38, 40 reinforces the cam portions 34, 36 where they are connected to the shaft. Cam part 34
．． Adjacent or mutually opposing surfaces of 36 are provided with recesses to define cam follower receiving slots 42, 44 in each cam. protruding track 46
．． 48 are provided along the inner periphery of the slots 42, 44 and project outwardly from the adjacent cam surfaces.

A cam follower assembly 51 is mounted at the distal end of the drive rod 20 in close proximity to the cam mechanism 18 .

In the embodiment of the invention shown here, the cam followers include rollers 52, 54, 56, 58, which are pivotally connected to this end of the drive rod 20. More particularly, rollers 52,54 are positioned along one side of the rod 20, with rollers 52, 52, 52, 52, 52, 52, 52, 52, 52, 52, 54 positioned along one side of the rod 20, the rollers 52, 52,
2, the rollers 54 being moved along the protruding tracks 46.

Similarly, rollers 56, 58 and 52° 54
Positioned on the opposite side of the rod 20, a roller 58 is housed within the slot 44, and a roller 56 is also fitted with the track 48. As shown most clearly in FIG. 1, the recess 42 of the track 4.6 is normally generally cardioid in shape, and the follower 51 is connected to the axis 12 and
As the cam segment rotates, a smooth change of direction can be achieved.

In this way, the cam mechanism converts the rotational motion of shaft 12 into a reciprocating, push-pull motion to move drive rod 20.

Although not shown in the drawings, a cam assembly may also be installed to receive an even smoother output from the transmission.

These lever portions are supported by a lever support structure as described below.

Furthermore, as shown using arrow 60, axis 1
2 can rotate in either direction, independent of the movement of the transmission device.

Additionally, due to the symmetrical shape of the cam assembly 18, the drive rod 20 occupies its position in the plane that divides the cam assembly in half, thereby minimizing undesirable vibrations. limited to.

In the embodiment illustrated here, the drive rod 20
, and output rod 26 are forced to reciprocate in a linear manner.

Furthermore, these rods 20.26 perform linear movements parallel to each other. In the drawings, for convenience of illustration and explanation, the rods 20 and 26 are shown in a common vertical plane. Incidentally, in the description, vertical,
The horizontal and vertical references should not be interpreted as being limited to these, since the transmission device can perform its function in any direction. This is because it can be done. A frame 64, which is attached to the housing, supports the rods 20, 26 for linear movement. FIG. 1, and
As best seen in FIG. 4, the frame includes a central plate, which may be divided into a number of parts.

The plate 68 includes a horizontally running slot 1-70 (FIG. 4) that receives the drive rod 20 and a lower horizontally running slot 72 that receives the output rod 26. stop.

- Shaped cutouts are provided at the upper and lower borders of each slot 70°72. The rod 20.26 is provided with a corresponding V-shaped protrusion so that the rod is accommodated in the slot.

4, the lever assembly 22 includes first and second lever segments 8.
0.82 are included, each given a specific spacing and its location on opposite sides of the plate 68. The lever portion is supported by a lever support structure 24 as described below. The support structure for this lever portion 82 consists of a mounting bracket 91 which is slidably attached to the side wall of the housing 16 or to the bracket 89. The mounting bracket 91 can slide vertically along the side wall 87.

As shown in FIG. 2, the side wall planket 87 is outwardly open, whereas the mounting blanket 91 has an inwardly open recess. are provided and the two elements are cooperatively fitted into each other.

As a result, the lever mounting bracket 91 cannot be displaced from the side wall bracket 87, allowing vertical movement of the mounting bracket.

The fulcrum pin part 92 is connected to the lever mounting bracket 91 by
It projects outwardly towards the lever portion 82. A collar portion 82 is provided with a collar 86 having a ring-shaped recess 88 for receiving a fulcrum bottle 92. Bearing 94
The collar 84 is rotatably connected to the pin 92. As can be seen in FIG. 4, the collar 86 and hence the fulcrum pin connect the lever portions 82.

As a result of this, the lever mounting bracket 91 causes a corresponding upward and downward movement of the lever portion 82.

Lever portion 80 is a mirrored image of lever segment 82 and includes a collar 84 that is pivoted to a fulcrum 93 of lever support bracket 90 . This is alternatively slidably mounted to the other side wall bracket 89.

The distal ends of the drive rod 20 and the output rod 26 are
It is pivotally and slidingly connected to lever portions 80, 82, as described below.

A longitudinally running recess 96 is provided in the surface of lever portion 80 adjacent plate 68 . Same depression 9
8 is provided in the surface of the lever 82 adjacent to this plate.

A single pin 103 passes through one end of the drive rod 20. This pin supports a roller 100 in slot 96 and another roller 102 in slot 98. Therefore, the drive shaft 12
The reciprocating movement of the drive rod 20 in response to rotation of the lever causes this lever to swing about the fulcrum pivot axis through the fulcrum pin portions 92,93. A pin 107 runs thereon through the distal end of the output lot 26. roller 1
04 is in pivot contact with this pin,
Further, occupying a position within the slot 98, while
A similar roller 106 is in pivotal contact with this pin and is also within slot 96.

As long as this fulcrum pivot axis is not aligned or aligned with the axis of the pin 107, if any swing occurs in the lever portion, the output rod 26
A reciprocating motion is generated. On the other hand, if the fulcrum axis is aligned with the axis of the pin 107, the lever portion 80, 82 will remain stationary even if it swings; is this lever,
The lever can be reinforced at or near the fulcrum where it is subjected to high stress. This reinforcing action can be performed by means of reinforcing collars 84, 86. The reason for this is that strengthening the overall lever is not necessary to counteract the higher stresses at the fulcrum position than elsewhere, and the overall lever weight may be reduced. Because it's good. Furthermore,
This is because the mass of this lever is concentrated at the fulcrum and not at either end of the lever, so this lever can be operated at a high swing speed.

Additionally, the design of the lever ensures that the same mass acts on both sides of the drive rod and the output rod, so that undesirable rocking movements are reduced to a minimum.

A drive adjustment mechanism is provided by which the distance between the fulcrum pivot axis and the axis of pin 103 can be adjusted relative to the distance between the fulcrum pivot axis and the axis of pin 107. can.

This type of adjustment device adjusts the travel distance of the output shaft 26 in response to the reciprocating movement of the drive shaft 20. Furthermore, the means for adjusting this distance may align the fulcrum pivot axis with the pin 107. Once the alignment is completed in this manner, the output rod 26 comes to rest together with the output shaft 14.

One form of adjustment means includes a shaft 108 supported by the housing 16.

The arms 110, 112 project outwardly from the shaft 108 and are keyed or otherwise fixed thereto. In this way, pivoting movement of axis 108 results in a corresponding pivoting movement of arms 110° 112.

These arms occupy their position in the same plane as the respective lever support bracket 91,90. A link (FIG. 4) is pivotally connected at one end to the arm 110 and at the other end to a bracket 91 supporting the lever. This same link is attached to the arm 112 at one end and to the lever support placket 112 at the other end.
-90. When rod 108 is rotated in one direction, lever support bracket 90.9L and lever portion 80 are removed, as shown in FIG.
．． 82 in an upward direction, whereas if this shaft is rotated in the opposite direction, the lever part will undergo a downward movement. As explained above, each rod 20.26 is slidably engaged with the lever section. As a result, movement of the lever section causes the moment of the output rod on the lever section to move from the fulcrum pivot axis. Relative to the distance to the position, the distance between the fulcrum pivot axis and the instantaneous position of the drive rod on the lever part is adjusted.

This causes a change in the travel distance of the output rod as a result of the reciprocating motion of the input rod. The shaft 80 can be rotated manually or by using the knob 120.
Alternatively, you can use a small motor. A mechanism (not shown) is provided by which the shaft 10B is fixed in one location until it is moved to another position.

Any suitable mechanism may be used to convert the reciprocating motion of the output rod 26 into a rotation of the axis 14, but by way of example, if 32 is used as the output utilization means. is shown in the diagram.

In this arrangement, a rack (FIGS. 1, 2, and 3) 124 rests on the upper surface of the output rod 26.

The rack meshes with gears 126 and 128, which in turn drive ratchets or one-way clutches 130 and 132, respectively. When the power transmission device is in forward motion, the rack 124 reciprocates on the right side in FIG. 1, as described above, so that the gear 128 is driven counterclockwise. When moving in this direction, the one-way clutch 130 meshing with the gear 128
Rotate 4. The shaft 134 carries a gear 137, which meshes with the gear 13B on the output shaft 14. As a result, when the shaft 134 rotates, the gears 137 and 138 cause the output shaft 14 to rotate in the forward direction. At the same time, one-way clutch 132 disengages shaft 136 from gear 126, so that the shaft is no longer driven.

Concomitantly, when rack 124 moves to the left in FIG.
Remove from 34. However, because gear 126 meshes with shaft 136, this shaft is driven clockwise.

Gear 135 on shaft 136 is similar to gear 13 on shaft 134.
7 and, therefore, when the gear 136 is driven,
Gear 137 drives gear 138, and output shaft 14 is again rotated in the forward direction. As described above, this power transmission device is configured to rotate the shaft 136 while performing the reverse movement.
As is driven, gear 139 on this shaft drives gear 10 on output shaft 14, driving the output shaft in the reverse direction.

Mechanisms for transitioning from forward motion to reverse motion are provided to shift power transmission from forward to reverse and vice versa.

The transition mechanism includes a clutch 150 that allows for transition along axis 14. FIG. 2 shows the clutch mechanism in a neutral position.

When shifted downwardly along shaft 14, as shown in FIG. 2, clutch 150 connects forward gear 138 with shaft 14, thereby
The shaft is driven in the direction of forward motion when reciprocating the output rod. Conversely, when the clutch 150 is moved upwardly along the shaft 14 as shown in FIG. 2, the clutch 150 connects the reverse gear 140 to the shaft 14; 14 is driven in the backward direction as the output lot reciprocates.

One arm 152 has one end rotatably connected to clutch 150 (see FIG. 3);
Further, the other end is connected to a vertical bar-shaped moving fitting 154. Since the movable fitting 154 can pivot, it causes the arm 152 to pivot, thereby causing the slip clutch 150 to engage and disengage from the forward gear and the reverse gear 138, 140.

The motion of this power transmission device is best understood in the manner shown in FIGS. 5 and 6. Reference may be made to a schematic diagram of this device. As the cam portion 34 rotates, the cam follower 51 transfers this rotational movement to the bush pull of the drive rod 20 or
Convert to reciprocating motion. As drive rod 60 reciprocates, lever assembly 22 swings about a fulcrum pivot axis running through pin 92. In addition, the distal end of the drive rod 20, which is connected to the lever part, undergoes a sliding and pivoting movement relative to the lever part as this rocking movement occurs. A relative pivoting movement occurs between the lever portion and the drive rod 20 about the axis of the pin 130. In addition, the distal end of the output rod 26, which is connected to the lever section, can perform sliding and pivoting movements relative to the lever section. A relative pivoting movement occurs between the lever portion and the output rod about the axis of pin 107. When the fulcrum pivot axis is moved by the speed adjustment mechanism 28 to the position shown in FIG. 5, the axis of the pin 107 is aligned with the fulcrum pivot axis. As a result, the lever portion 82
When vibrated by , the output rod 26 remains stationary. With this arrangement, the output shaft 14
Appears as pm output.

Drive speed adjustment mechanism 28 adjusts the relative distance between the fulcrum pivot shaft and the respective ends of the shafts connected to the lever segments. More specifically, as arm 110 moves upward, the fulcrum pivot axis moves away from the axis of pin 1.07;
Approach the axis of 3.

As a result of this, the output rod 26 begins to reciprocate, as shown in FIG. 128. When this fulcrum pivot shaft is moved until the centers are aligned with the axis of the pin 103, the reciprocating motion of the drive rod 20 and the reciprocating motion of the output rod 26 become in one-to-one correspondence.

This power transmission is thus endowed with the ability to steplessly vary the output speed over a wide range from Q rpm to higher speeds.

The device is additionally endowed with the ability to deliver high output torque at low output speeds of the output shaft. Furthermore, both high and low outputs are obtained by coupling the dual cam and cam follower lever to a common output shaft.

Having illustrated and described the principles of this invention with reference to an idealized embodiment, it will be apparent to those skilled in the art that the principles of this invention can be used in various ways, such as arrangement and , it should be understood that details can be changed. The author claims that all such modifications come within the true spirit of the following claims.

[Brief explanation of drawings]

FIG. 1 is a vertical cutaway view of a power transmission device according to the present invention taken along line 1--1 of FIG. FIG. 2 is a partially cutaway plan view of the power transmission device according to the present invention. 3 is a side view of the end of the power transmission taken along line 13-3 of FIG. 1; FIG. FIG. 4 is a cross-sectional view of the power transmission device taken along vA4-4 in FIG. 1. FIG. 5 is a schematic diagram of a power transmission device according to the invention, showing the lever and fulcrum assembly in one location. FIG. 6 is a schematic diagram of a power transmission according to the invention, with the lever and fulcrum assembly assembled in a different position than in FIG. 10... Power transmission device, 12... Input shaft, 14...
- Output shaft, 16... Housing, 18... Cam mechanism, 20... Drive rod, 22... Lever assembly, 24... Lever support structure, 26... Output rod, 28...・Speed adjustment mechanism, 64...Frame, 8
0.82... Lever part, 110, 112... Arm, 124... Rack, 130... One-way clutch, 150... Clutch. Procedural amendment (method) Showa 1?・4・! 2 B

Claims (20)

[Claims] (1) A power transmission device for transmitting power from a reciprocating drive rod to a reciprocating output rod, comprising: lever support means; lever means; at a specific position between both ends of the lever means; fulcrum means for pivotally connecting said lever means to said lever support means; an end of said lever means slidably connected to an end of said drive rod; and an end of said lever means slidably connected to an end of said output rod; the other end of said lever means being slidably connected to said lever means, said lever support means and then said lever means being shifted relative to said input and output rods, thereby increasing the reciprocating distance of said output rod. A device comprising: drive adjustment means for varying the drive rod in response to reciprocating motion; (2) The lever means includes a lever portion and a collar projecting outward from the lever portion at a specific position, and the collar pivotally connects the fulcrum means to the lever support means. The power transmission device according to item 1. (3) the lever support means includes lever support bracket means, and the fulcrum means comprises a fulcrum pin portion of the lever support bracket means, which projects outwardly from the lever support bracket means; The collar has an opening for receiving the fulcrum pin means, and the device further includes bearing means for pivotally connecting the collar to the fulcrum pin portion. The power transmission device described in section. (4) The output adjusting means includes means for moving the lever support bracket means and thereby also moving the fulcrum pin portion and the lever means. Power transmission device. (5) lever support means; a lever means having first and second end portions; in a fixed pivot position between the first and second end portions of the lever means; fulcrum means pivotally connected to the lever support means; drive rod means driven for reciprocating motion;
The drive rod means is configured to provide a first end of the lever means with a sliding and pivoting motion for causing a sliding and pivoting motion relative to the lever means as the drive means reciprocates. means having one end movably coupled; a drive rod for guiding the movement of said drive rod means to impart reciprocating motion to said lever means as said drive rod means performs reciprocating motion; guiding means; output rod means having one end for causing a second end of said lever means to slide and pivot; selectively moving said lever support means, thereby causing said lever means to slide and pivot; drive adjustment means for changing the distance from the pivot position to the one end of the output rod means with respect to the distance from the pivot position to the one end of the output rod means; Output rod guide means for guiding the movement of the output rod means to perform a reciprocating movement in response to the reciprocating movement of the lever means each time a non-zero distance occurs to the one end of the output rod means; A power transmission device comprising: a distance over which the output rod means reciprocates by movement of the lever support means in response to the reciprocating motion of the drive rod means. (6) The lever means includes a lever part having first and second side walls, and a collar projecting outwardly from the first side wall of the lever part in the pivot position, the collar means are pivotally connected to said lever support means by said fulcrum means, said lever portion comprising:
a longitudinally running, outwardly opening slot along a second side wall; said first roller means being pivotally connected to said one end of said drive rod means; occupying a position pivotally and slidingly coupled the drive rod means to the lever means; and a second roller means pivotally coupled to the one side of the output rod means; 6. The power transmission device of claim 5, wherein said output rod means is positioned within said slot and pivotally and slidingly coupled to said output rod means and said lever means. (7) The lever means has first and second spaced apart lever parts, each of the lever parts having first and second side walls, the second side wall being , occupying positions close to each other, said lever portions each having a slot running longitudinally and opening inwardly; means for supporting said drive rod means positioning said one end between said lever portions; the one end of the drive rod means includes a first coupling means slidably positioned within a slot of the lever portion and further pivoted to the lever portion; a second coupling slidably positioned within a slot of the lever portion and further pivotally mounted to the lever portion; and said one end of said output rod means including means. (8) said first coupling means includes a first set of at least two roller means pivotally connected to said one end of said drive rod means; is positioned in a slot of one of said lever portions, further roller means of a first set is positioned in a slot of the other of said lever means, and further said second The coupling means includes a second set of at least two roller means pivotally connected to said one end of said output rod means, one set of roller means of said second set being pivotally connected to said one end of said output rod means. 8. A lever according to claim 7, further comprising a second set of roller means positioned in a slot in one of the lever parts, and further roller means of a second set being positioned in a slot in the other of the lever parts. Power transmission device. (9) The first lever portion includes a first collar means projecting outward from the first side wall at its pivot position; second collar means projecting toward the direction; the lever support means being positioned within the opening of the first collar for pivotally supporting the first collar portion and thereby the first lever portion; a first lever support bracket having a first outwardly projecting fulcrum pin means; said lever support means further comprising a second collar and, as a result, pivotally supporting the second lever portion; 9. The power transmission device of claim 8, including a second lever support bracket having second outwardly projecting fulcrum pin means positioned within an opening in the second collar for providing a second lever support bracket. (10) The first and second lever support brackets include a housing, and the first and second lever support brackets are arranged at one end of the output rod means from the pivot position relative to the distance from the pivot position to the output rod means. claim 9, wherein said drive adjusting means includes means for moving said lever support bracket, said housing being slidably mounted on said housing for effecting a movement in the direction of changing the distance to said lever support bracket; The power transmission device described in section. (11) The drive rod guide means includes means for restricting the drive rod means for reciprocating motion in a first line, and further the output rod guide means includes a means for restricting the drive rod means in a second line parallel to the first line further comprising means for restricting said output rod means for reciprocating movement of said first and second lever support brackets; and slidably mounted on said housing for said drive adjustment means; said drive adjustment means including means for sliding said first and second lever support brackets. power transmission device. (12) The drive adjustment means includes a rod pivotally connected to the housing, first and second arms attached to the rod, the first arm, and the first lever support bracket. a first link pivotally connected to the second arm, a second link pivotally connected to the second lever support bracket, and the first and second lever support brackets. means for pivotally connecting said rods, and thereby for varying the distance from said pivot position to said one end of said drive rod means relative to the distance from said pivot position to said output rod means; The power transmission device according to claim 11, including the first and second lever portions. (13) a drive shaft rotatably mounted to said housing and adapted to rotate, cardioid cam means mounted to said drive shaft means, rotation of said drive shaft reciprocating said drive rod means; 13. A power transmission system as claimed in claim 12, including cam follower means for coupling said drive rod means to said cam means for causing movement. (14) The cam means comprises first and second mutually spaced apart cam portions, the first walls of which are adjacent to each other; each of the first walls includes a cardioid groove; and a first wall and a more protruding cardioid track along an inner boundary of said cardioid groove, said cam follower means having said drive rod means on the side opposite said one end. is pivotally connected to one end of the roller means, said roller means including a first roller positioned in a groove in the first cam part, and a second roller positioned in a groove in the second cam part. 14. The power transmission device of claim 13, wherein the third roller rides on the track of the first cam part and the fourth roller rides on the track of the second cam part. . (15) The output rod means includes an output shaft means rotatably mounted on the housing, and further includes the output rod means for converting and transmitting the reciprocating motion of the output rod means into rotational motion of the output shaft; 15. The power transmission system of claim 14 including means for coupling said output shaft. (16) a housing, a drive shaft rotatably mounted to said housing and further adapted to be driven to rotate, cardioid cam means mounted to said drive shaft means, and rotation of said drive shaft; 6. The power transmission system of claim 5, further including cam follower means for coupling said drive rod means to said cam means to cause said drive rod means to reciprocate. (17) The cam means is constituted by first and second spaced apart cam portions having first walls adjacent to each other, the first walls having a cardioid shape. a groove, and a cardioid track projecting from the first wall along an inner boundary of the cardioid groove, the cam follower means being connected to the drive rod on the side opposite the one end. roller means pivotally coupled to the ends of the means, said roller means comprising a first roller positioned in a groove in said first cam portion and a first roller positioned in a groove in said second cam portion; Claim 16 comprising a positioned second roller, a third roller mounted on the track of the first cam portion, and a fourth roller mounted on the track of the second cam portion. The power transmission device described in section. (18) Output shaft means rotatably mounted on the housing, and connecting the output shaft to the output rod means for converting reciprocating motion of the output rod means into rotational motion of the output shaft. 17. A power transmission device according to claim 16, including means. (19) A fulcrum means; a fulcrum support means for supporting the fulcrum means; a lever means comprising a first end, a second end, and an intermediate portion, the intermediate portion comprising: lever means, the lever means being pivotally connected to and further supported by the fulcrum means for pivoting about a first pivot axis; shaft support frame means; the first end of the lever means; , a drive rod means having a first end slidably and further pivotally mating, said drive rod means being mounted to said shaft support frame means for reciprocating movement; , when the drive rod means reciprocates, the drive rod means reciprocates in order to impart a rocking motion to the lever means; furthermore, when the lever means swings, the drive rod pivotably movable about a second pivot axis for movement relative to the lever means; slidable and pivotable with the second end of the lever means; output rod means having interlocking first ends and pivoting a third pivot shaft movable relative to the lever means when the output rod means reciprocates; the fulcrum means; said drive adjustment means for selectively moving said first axis and said lever means, said first axis relative to a distance from said first pivot axis to said third pivot axis; means for varying the distance from the pivot axis to the second pivot axis; always comprising said output rod means mounted on said shaft support frame means for reciprocating motion in response to the oscillatory movement of said lever means; whereby movement of said fulcrum means causes reciprocation of said input rod means; A power transmission device in which the distance over which the output rod means reciprocates changes depending on the movement. (20) The drive adjustment means includes means for selectively moving the fulcrum means for aligning the third pivot axis with the first pivot axis, thereby realizing such alignment. 20. The power transmission system of claim 19, wherein when the output rod means is moved, the output rod means remains stationary even though the drive rod means reciprocates.