JP2603133Y2 - Reciprocating piston type air compressor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION A reciprocating piston type air compressor according to the present invention is mounted on a large vehicle such as a truck and is driven by a traveling engine to produce compressed air for driving a braking device.

[0002]

2. Description of the Related Art As a braking device for a large vehicle such as a truck, a device driven by compressed air is widely used. Compressed air for driving such a braking device is created by driving an air compressor with a traveling engine, but as an air compressor,
A reciprocating piston type is generally used.

FIG. 3 shows an example of such a reciprocating piston type air compressor. An intake port and a discharge port are provided at the upper end of the cylinder 1. A piston is provided in the cylinder 1 in an airtight and axial direction (vertical direction in FIG. 3).
Are reciprocally movable. A pivot is provided on the piston in a horizontal direction (left-right direction in FIG. 3) orthogonal to the axial direction, and the upper end of the connecting rod 2 is pivotally supported by the pivot.

A crankcase 3 is fixedly connected to the lower end of the cylinder 1. A crankshaft 4 is rotatably supported inside the crankcase 3 by a pair of rolling bearings 5, 5. . The center axis of rotation of the crankshaft 4 and the pivot are parallel to each other. The crankshaft 4 includes a pair of connecting portions 8, which are formed by connecting both ends of a pair of rotating shaft portions 6, 6 concentric with each other and an eccentric shaft portion 7 eccentric to the rotating shaft portions 6, 6. Concatenation,
The rotating shaft portions 6 are rotatably supported inside the crankcase 3 by the rolling bearings 5.

The lower end of the connecting rod 2 is pivotally supported by the eccentric shaft 7. As a result, the piston moves up and down in the cylinder 1 with the rotation of the crankshaft 4 to perform suction, compression and discharge of air. Also, integrated balance weights 9, 9 are formed from one end (the lower end in FIG. 3) of each of the connecting portions 8, 8 toward the opposite side (the lower side in FIG. 3) from the eccentric shaft portion 7, and the cranks are formed. The balance during rotation of the shaft 4 is ensured.

Accordingly, at the lower end of the connecting rod 2,
The lower end portion of the connecting rod 2 is pivotally supported by the eccentric shaft portion 7 by providing a split ring member 10 and connecting the elements constituting the ring body 10 at the eccentric shaft portion 7.

On the other hand, for the purpose of improving the reliability of the pivot at the lower end of the connecting rod 2, the ring provided at the lower end of the connecting rod 2 may have an indivisible structure. In the case of an indivisible ring, the ring cannot be assembled to the eccentric shaft portion 7 provided with the integral balance weights 9 on both sides. For this reason, conventionally, when an indivisible ring is used, as shown in FIG. 4, the crankshaft 4 is provided with only one connecting portion 8 on one side of the eccentric shaft 7 (right side in FIG. 4). The weight 9 was provided, and the balance weight 9 was not provided on the connecting portion 8 on the other side.

When the ring is externally fitted to the eccentric shaft 7, the crankshaft 4 is inserted into the ring from the side where the integrated balance weight 9 is not provided.

[0009]

SUMMARY OF THE INVENTION The reciprocating piston type air compressor of the present invention can secure a sufficient rotational balance without increasing the diameter of the crankshaft even if an indivisible ring is provided. Is what you do.

As shown in FIG. 4, when the integrated balance weight 9 is provided only on one side of the eccentric shaft 7, the weight of the eccentric shaft 7 cannot be balanced as it is, and the crankshaft 4 is Vibration is likely to occur when rotating at high speed. A certain degree of balance can be achieved by increasing the thickness of the integrated balance weight 9 provided only in one piece or by increasing the amount of protrusion from the rotary shaft portion 6, but the shape and size of the crankcase 3 can be improved. Due to such restrictions, there are cases where such means cannot be adopted.

It is desirable that the balance weights be present on both sides of the eccentric shaft portion 7 in order to prevent the crankshaft 4 from whirling when the crankshaft 4 rotates at high speed.

The reciprocating piston type air compressor of the present invention has been devised in view of the above circumstances.

[0013]

The reciprocating piston type air compressor according to the present invention has a cylinder having an intake port and a discharge port and an airtight and axial direction inside the cylinder, similarly to the above-mentioned conventional reciprocating piston type air compressor. A reciprocatingly fitted piston, a pivot provided on the piston in a direction perpendicular to the axial direction, and a crankcase fixedly coupled to the lower end of the cylinder. A crankshaft in which both ends of the rotary shaft portion and an eccentric shaft portion eccentric to the rotary shaft portion are connected by a pair of connecting portions, and the rotary shaft portion is rotatably supported inside the crankcase. And a connecting rod that pivotally supports the lower end of the eccentric shaft and the upper end of the pivot.

In particular, in the reciprocating piston type air compressor of the present invention, the crankshaft is eccentric only from one end of the pair of connecting portions to the other connecting portion. The connecting rod has an integral balance weight protruding to the opposite side, and the lower end of the connecting rod has an inseparable ring that can be externally fitted to the eccentric shaft, and has a circular hole.
The direction opposite to the weight part formed and eccentric to this circular hole
Separate balance with two holding plates formed by stretching
The weight is connected with the circular hole to the other connecting portion.
Fit the rotation shaft part without play,
It is characterized in that it is attached to the crankshaft by holding the connecting portion of .

[0015]

The operation of the reciprocating piston type air compressor of the present invention configured as described above compresses the air sucked into the cylinder from the intake port and then discharges the compressed air from the discharge port. This is the same as the conventional reciprocating piston type air compressor described above.

In particular, in the case of the reciprocating piston type air compressor of the present invention, an indivisible ring can be provided at the lower end of the connecting rod, and balance weights can be provided on both sides of the eccentric shaft.

[0017]

1 and 2 show an embodiment of the present invention. Cylinder 1 having an intake port and a discharge port (see FIG. 3.
Omitted for 2. Inside the parentheses, a piston is fitted in an airtight manner and reciprocally movable in the axial direction. A pivot is provided on the piston in a direction perpendicular to the axial direction, and the upper end of the connecting rod 2 is pivotally supported on the pivot.

A crankcase 3 is connected and fixed to the lower end of the cylinder 1, and a crankshaft 4 is rotatably supported in the crankcase 3 by a pair of rolling bearings 5,5. The crankshaft 4 includes a pair of connecting portions 8, which are formed by connecting both ends of a pair of rotating shaft portions 6, 6 concentric with each other and an eccentric shaft portion 7 eccentric to the rotating shaft portions 6, 6. Combine. And, among them, the rotating shaft part 6,
6 is supported inside the crankcase 3 by the rolling bearings 5 and 5.

At the lower end of the connecting rod 2, an indivisible ring 11 is formed integrally with the connecting rod 2. The lower end of the connecting rod 2 is pivotally supported on the eccentric shaft 7 by externally fitting the ring 11 to the eccentric shaft 7 via a slide bearing (not shown).

The crankshaft 4 is provided with an integral balance weight 9 only on one of the pair of connecting portions 8 (right side in FIG. 1). The integrated balance weight 9 is provided on the opposite side (see FIG.
Project below). On the other (left side in FIG. 1) connecting portion 8, such an integrated balance weight 9 is not formed, and the ring body 11 is attached to the eccentric shaft portion 7 from the other connecting portion 8 side. Fits freely.

Further, a separate type balance weight 12 which fits the other connecting portion 8 without looseness is supported by being fitted to the other connecting portion 8. This separate type balance weight 12 has a circular hole 13 through which the rotary shaft 6 can be inserted.
And a weight plate 15 for holding the other connecting portion 8 from both sides without rattling.

Such a separate type balance weight 12 is
After the ring body 11 is externally fitted to the eccentric shaft portion 7, the ring body 11 is externally fitted to and supported by the other connecting portion 8, and is held between the connecting portion 8 and the inner ring 16 of the rolling bearing 5. In this manner, in a state in which the separate-type balance weight 12 is externally fitted to and supported by the connecting portion 8, the weight portion 15 is connected to the eccentric shaft portion 7 from the end (the lower portion in FIG. 1) of the other connecting portion 8. Project to the opposite side (the lower side in FIG. 1). And this separate type balance weight 12
Are rotatable together with the crankshaft 4.

With the reciprocating piston type air compressor of the present invention configured as described above, the operation itself when compressing the air sucked into the cylinder 1 from the intake port and then discharging the compressed air from the discharge port is as follows. This is similar to the case of the conventional reciprocating piston type air compressor described above.

In particular, in the case of the reciprocating piston type air compressor of the present invention, the eccentric shaft portion 7 and the eccentric shaft portion 7 are formed by the integral balance weight 9 and the separate balance weight 12.
Since the ring 11 is fitted on the lower end of the connecting rod 2, it is possible to provide the indivisible ring 11 and to provide balance weights on both sides of the eccentric shaft 7.

[0025]

[Effect of the Invention] The reciprocating piston type air compressor of the present invention is constructed and operated as described above. Therefore, while improving the reliability of the pivotal support at the lower end of the connecting rod, the axial dimension and the outer diameter of the crankshaft are reduced. The rotation balance of this crankshaft can be secured without increasing the size.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention.

FIG. 2 shows a separate type balance weight, (A)
FIG. 2 is a view seen from the right side of FIG. 1, and FIG.

FIG. 3 shows a first example of a conventional reciprocating piston type air compressor.
Schematic sectional view showing an example.

FIG. 4 is an essential part cross-sectional view showing the second example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder 2 Connecting rod 3 Crankcase 4 Crankshaft 5 Rolling bearing 6 Rotating shaft part 7 Eccentric shaft part 8 Connecting part 9 Integrated balance weight 10, 11 Ring body 12 Separate type balance weight 13 Circular hole 14 Suppression plate part 15 Weight part 16 Inner ring

Claims (1)

(57) [Scope of request for utility model registration] A cylinder having an intake port and a discharge port;
A piston airtightly fitted in the cylinder so as to be reciprocally movable in the axial direction, a pivot provided in the piston in a direction perpendicular to the axial direction, and fixedly connected to a lower end of the cylinder; and crankcase made by connecting the eccentric shaft portion at the junction of a pair of eccentric to the rotation shaft and both ends of the rotating shaft of the concentric pair with each other, the eccentric shaft
The part is positioned on the inside of the crankcase, a crank shaft of the rotating shaft portion is rotatably supported in the crankcase, the lower end to the eccentric shaft portion, the upper end to the pivot and pivotally supported respectively In the reciprocating piston type air compressor provided with the connecting rod, the crankshaft is provided only on one of the pair of connecting portions on the side of one of the connecting portions. It has an integrated balance weight that protrudes to the opposite side, and the lower end of the connecting rod is connected to the other connecting portion and this connecting portion.
The ring has an inseparable ring body which can be fitted to the eccentric shaft part through the rotating shaft part, and forms a circular hole.
Stretched in the opposite direction to the weight part
Insert the formed separate balance weight into the hole above
Of the rotating shaft connected to the other connecting part without rattling
The other connecting part with the holding plate
A reciprocating piston type air compressor that is mounted on a shaft .