JPH074487A - Crank driving mechanism - Google Patents

Abstract

PURPOSE:To reduce the interval between both containers, and to realize a small size, by converting a rotary movement into a reciprocating movement, or a reciprocating movement into a rotary movement, as to a member and the like moving in two containers provided opposing each other, through a connecting body. CONSTITUTION:An eccentric shaft 2 is fixed to a power shaft 1, and a connecting rod 3 is installed on the eccentric shaft 2 through a bearing 4, while a driving shaft 7 is installed on the other side of the rod 3 through a bearing 5. In this piston pump, a connecting body 6 is moved through the driving shaft 7 by rotating the power shaft 1, and a pumping operation is carried out by converting a pump chamber 10 in a cylinder 8. In this case, since both cylinders 8 are made as a guide of the sliding of two pistons 9, the influence of the force other than a linear reciprocating movement is reduced. As a result, no unnatural force is applied to the movement of the member such as the pistons, and to the cylinders and the like to receive the above movement, and a smooth movement can be realized. Furthermore, the interval between both cylinders can be made relatively small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crank mechanism which is driven to change the volume in a variable volume mechanism using a piston, a diaphragm and the like.

[0002]

2. Description of the Related Art In a variable volume mechanism that changes the volume in a container to perform a pumping action by reciprocating a piston in a cylinder of a pump or the like or deforming a diaphragm, a crank for driving a piston or a diaphragm is used. A drive mechanism is used. As this crank drive mechanism,
It is used in pumps, compressors, etc. that change the rotational force of an eccentric shaft into reciprocating motion of pistons, diaphragms, etc., and conversely, in engines, air motors, etc. that change the reciprocating motion of pistons and diaphragms into rotary motion. These crank mechanisms have substantially the same configuration and operation, and are as shown in FIGS. 6 and 7, for example. In these drawings, reference numeral 21 denotes a motor, and an eccentric shaft 22 is attached to a motor shaft 21a thereof, and a connecting lot 24 is attached to the eccentric shaft 22 via a ball bearing 23. A retainer 26 attached to a diaphragm 25 is fixed to the connecting rod 24. The diaphragm 25 is fixed to a pump casing 28, which forms a pump chamber 29. Further, 30 and 31 are an inlet and an outlet, respectively, and a check valve 32,
33 is provided.

In the pump having such a structure, when the motor 21 is driven, the eccentric shaft 22 causes the connecting rod 24 to move up and down by the rotation of the motor shaft 21a. As a result, the motor shaft 21a makes a half rotation, so that the state shown in the drawing is changed. The connecting rod 24 moves upward, and the air in the pump chamber 29 located above is discharged from the discharge port 31. On the other hand, the pump chamber located below has a larger volume and is sucked through the suction port 30. When the motor shaft 21a further makes a half rotation, the state returns to the illustrated state, and the upper pump chamber 29 is sucked and the lower pump chamber 9 is discharged. By repeating this, the pump action is performed.

The motor shaft 21 is changed from the state shown in FIG.
When a is rotated a quarter turn, as shown in FIG. 8, the connecting rod 24 is tilted, whereby the diaphragm 28 is deformed into an unreasonable shape, the life of the diaphragm is shortened, and the compression ratio cannot be increased, Furthermore, there is a drawback that the length of the rod must be increased and the pump becomes large.

FIG. 9 is a diagram showing a piston using a crank mechanism. In this example, the connecting rod 4
1 is rotatably coupled to a piston 42 by a connecting shaft 44 and a bearing 43.
Reciprocates in the cylinder 46. Reference numeral 45 denotes a piston ring made of a sealing material, which seals to form a pump chamber 47 in the cylinder 46. In FIG. 9, the two connecting rods 41 are connected to each other by the eccentric shaft 49.
Since they overlap each other in the vicinity of, they look like one body, but in reality, they are displaced as shown in FIG. 7 and are composed of two separate components.

In this piston mechanism, when the motor is driven to rotate the shaft 48, the connecting rod 41 causes the piston 42 to reciprocate in the cylinder 46. This provides a pumping action. In the movement of this pump, the piston 42 is moved by the connecting rod.
A force other than the force in the direction along the side wall of the cylinder 46 (lateral direction in the drawing) is received, and the inside of the cylinder 46 is worn in an elliptical shape, so that the length of the piston 42 in the movement direction can be shortened. Absent.

FIG. 10 shows another example of a conventional piston, which has a structure in which a piston 51 is provided with a piston shaft 52, and the piston shaft 52 is connected to a connecting rod 53 through a bearing 54 that receives the piston shaft 52. , Which compensates for the drawbacks of the piston shown in FIG. However, this piston also has no choice but to increase the distance between the two pistons.

The configuration of these conventional examples is shown in FIG.
It is schematically shown in (C). As shown in this figure, the circular motion can be exchanged for linear motion by the crank drive mechanism, but as is clear from (B) and (C), the distance between both cylinders (pistons) must be increased. .

Incidentally, in the engine and the fluid motor,
The motion is transmitted in the opposite direction, and linear motion is transformed into circular motion, but it is basically the same.

[0010]

SUMMARY OF THE INVENTION According to the present invention, the above-mentioned member of a volume variable mechanism whose volume changes by a member that moves or deforms in a container such as two cylinders that are arranged opposite to each other is used for moving or deforming the member. The crank drive mechanism to be used is capable of smoothly operating smoothly, and can provide a crank drive mechanism that can be made into a small-sized device by reducing the distance between both containers.

[0011]

A crank drive mechanism according to the present invention is provided with a connecting body for connecting two members for performing the piston action as described above, and the connecting body is circularly moved through an eccentric shaft or the like. (Rotary motion) is converted to reciprocating motion (linear motion) to move a member such as a piston, which causes an unnatural force on the motion of the member such as a piston or a cylinder receiving it. It enables smooth and smooth movement without any difficulty, and can relatively shorten the distance between both cylinders (pistons).

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the crank drive mechanism of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a case where the first embodiment of the present invention is applied to a piston pump. In FIG.
Reference numeral 1 is a power shaft such as a motor shaft, and an eccentric shaft 2 is fixed to the shaft 1. A connecting rod 3 is provided on the eccentric shaft 2 via a bearing 4 and a bearing 5 is provided on the other side of the connecting rod 3. The drive shaft 7 is attached via.
The drive shaft 7 is fixed to a connecting body 6 that connects the respective pistons 9 of the two cylinders 8.

In the piston pump using the crank mechanism having the above-mentioned structure, by rotating the power shaft 1,
The connecting body 6 is moved through the drive shaft 7 to change the pump chamber 10 in the cylinder 8 to perform a pumping action.

At this time, since both cylinders 8 serve as guides for sliding the two pistons 9, the influence of forces other than the linear reciprocating motion is reduced. FIG. 5A is a schematic diagram showing this motion, and is a schematic diagram showing the motion of the conventional crank mechanism. The movement is completely different from that of (B) and (C).

FIG. 2 is a diagram showing a second embodiment of the crank mechanism of the present invention. In this embodiment, the connecting rod 3 is arranged inside the connecting body 6 near the movement center of the piston, and the direction of force is further improved as compared with the first embodiment, which is advantageous in terms of space. That is, since the eccentric shaft 2, the connecting rod 3, the connecting body 6 and the like are located on substantially the same plane, the force is smoothly transmitted, and it is advantageous without taking a special space.

FIGS. 3 and 4 show a third embodiment applied to a diaphragm pump with a structure similar to that of the second embodiment shown in FIG. 2. FIG. 3 is a front view and FIG. 4 is a cross section. It is a figure. In this embodiment, 11 is a diaphragm attached to the case 12, which forms the pump chamber 13. Others are substantially the same as the first and second embodiments,
1 is a power shaft, 2 is an eccentric shaft, 3 is a connecting rod,
6 is a connecting body, and 7 is a drive shaft.

Also in this third embodiment, the rotation of the power shaft 1 causes the drive shaft 7 to move via the eccentric shaft 2 and the connecting rod 3 to move the connecting shaft 6, which is connected to both ends thereof. Due to the deformation of the diaphragm 11, the volume of the pump chamber 12 is changed and the pump action is performed.

In each of the embodiments described above, the operation as schematically shown in FIG. 5A is performed, and the drive for changing the volume such as the pump action is performed without difficulty. Further, as is clear from comparison with (B) and (C) of FIG. 5, even if the distance between the two cylinders is shortened, it is possible to drive reasonably and the overall size of the device including the two cylinders can be reduced. It is possible.

[0020]

According to the crank drive mechanism of the present invention, a member for moving in two containers disposed opposite to each other is connected to a connecting body, and the rotary motion is reciprocating or the reciprocating motion is rotated through the connecting body. By exchanging the movement, it is possible to smoothly operate smoothly, and it is possible to shorten the distance between the two containers, so that the entire apparatus can be downsized.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a second exemplary embodiment of the present invention.

FIG. 3 is a front view of a third embodiment of the present invention.

FIG. 4 is a sectional view of a third embodiment of the present invention.

FIG. 5 is a schematic diagram showing the operation of the present invention and a conventional example.

FIG. 6 is a front view of a conventional crank mechanism.

7 is a side view of the crank mechanism shown in FIG.

FIG. 8 is a diagram showing a state in which the crank mechanism of FIG. 6 is rotated ¼ rotation.

FIG. 9 is a front view of a conventional crank mechanism used for a piston.

FIG. 10 is a view showing another conventional crank mechanism used for a piston.

[Explanation of symbols]

 1 power shaft 2 eccentric shaft 3 connecting rod 6 connecting body 7 drive shaft

Claims (3)

[Claims] 1. A variable volume mechanism having a member arranged in a container such as two cylinders facing each other and moving or deforming while maintaining airtightness in the container, the volume in the container changing by the movement or deformation of the member. In, a connection body for integrally connecting the moving or deforming members of the two containers, and an eccentric shaft engaged with the connection body, the rotational movement of the connection body via the eccentric shaft. A crank drive mechanism in which the member is moved or deformed so as to change the linear reciprocating motion to move the linear motion or the linear motion to the rotary motion. 2. The crank drive mechanism according to claim 1, wherein the eccentric shaft and the connecting body are arranged side by side in the vicinity of the same plane. 3. The crank drive mechanism according to claim 1, wherein the drive shaft is attached to the connecting body so as to be close to a container in one direction, and the eccentric shaft is arranged at a position close to another container.