JP2789637B2 - Hydraulic engine - Google Patents

Description

The present invention relates to a hydraulic engine of a radial piston type and a type in which a shaft rotates.

(B) Conventional technology A radial piston hydraulic engine is a type in which an eccentric portion provided on a part of a shaft is accommodated in a casing, and a plurality of pistons are radially arranged around the eccentric portion in the casing. It is. The eccentric part is fitted in the center hole of the cylinder block, and the piston is inserted into the cylinder hole of the cylinder block. Further, a pair of flow paths extending in the axial direction are formed in the shaft. Then, the liquid is supplied to the cylinder hole of the cylinder block through one flow path of the shaft, and is discharged to the outside through the other flow path. For example, when the hydraulic pressure is supplied from the outside, the piston is pressed against the inner peripheral surface of the casing, and a torque is generated in the eccentric portion of the shaft, thereby operating as a so-called motor that drives the shaft to rotate.

By the way, in a radial piston type hydraulic engine of this type of shaft rotation type, it is necessary to always supply the hydraulic pressure to one flow path of the shaft and discharge it from the other flow path regardless of the rotation of the shaft. Therefore, conventionally, a distributor, that is, a supply / discharge mechanism is provided on the outer peripheral surface of the shaft, and the hydraulic pressure is supplied and discharged by the distributor.

(C) Problems to be Solved by the Invention Providing a distributor at the outer end of the shaft has a problem that the engine becomes heavier in addition to being unbalanced, and becomes larger. .

(D) Means for Solving the Problems According to the present invention, an eccentric portion provided on a part of a shaft is accommodated in a casing, and a plurality of pistons are radially arranged around the eccentric portion in the casing. An eccentric portion is fitted into a center hole of a cylinder blotter, and each of the pistons is inserted into a cylinder hole of the cylinder block, and a liquid is supplied to and discharged from the shaft through the cylinder hole of each cylinder blotter. In an engine provided with a mechanism and functioning as a pump or a motor by rotating the shaft, the liquid supply / discharge mechanism is
The casing is inserted from the bottom of the insertion end together with the supply and discharge ports for liquid to each cylinder hole and the respective flow paths connected thereto, with the shaft being inserted up to the center of the shaft support bearing on the axis of the shaft. A hydraulic engine comprising: a cylindrical body having a return hole connected to the inside thereof; and fixed holding means for fixedly holding the cylindrical body on a casing side.

(E) Operation The supply and discharge of the liquid are performed between the shaft and the cylinder inserted into the shaft, and the supply and discharge mechanism is accommodated in the shaft. Further, since the hydraulic pressure between the bottom of the insertion end of the cylindrical body and the shaft escapes through the return hole, no thrust force is generated on the cylindrical body or the shaft.

(F) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, this hydraulic engine is of a radial piston type, has a casing (1) and a shaft (2), and the casing (1) is fixed so as not to rotate with respect to a fixing portion (not shown). Is done.

The shaft (2) is mounted on the casing (1) and is rotatably supported by dual bearings (9) and (10). Furthermore, the eccentric part (3) is provided in a part of the shaft (2), and the eccentric part (3) is accommodated in the casing (1). On the other hand, in the casing (1), a plurality of pistons (4) are provided around the eccentric part (3) and are arranged radially.

As shown in FIG. 3, the eccentric part (3) of the shaft (2)
Are fitted in the center holes of the cylinder blocks, and each piston (4) is slidably inserted into the cylinder hole of each cylinder block. Furthermore, a pair of gaps (3A) and (3B) are formed by the notch of the eccentric part (3), and each flow path (5A) and (5B) is opened to each gap (3A) and (3B). And
It communicates with the cylinder hole (6H) of the cylinder block (6). Now, considering the case where a hydraulic pressure is generated outside and this hydraulic pressure is introduced into this hydraulic engine and operated as a motor, the hydraulic pressure is increased from the shaft (2) side to the gap (6A) of the eccentric portion (3). It is led to. When supplied to the cylinder hole (6H) of the cylinder block (6), it acts on the end face of the piston (4). Therefore, the piston (4) is pressed against the inner peripheral surface of the casing (1), and the reaction force generates a torque in the eccentric portion (3) of the shaft (2), whereby the shaft (2) is driven to rotate. The eccentric part (3) rotates in the center hole of the cylinder block (6), and the cylinder block (6) performs a circular motion, that is, a so-called razor motion, accordingly. Further, each piston (4) slides along the cylinder hole of the cylinder block. Thereby, rotation of the eccentric part (3) is allowed. Then, with the rotation of the eccentric part (3), the liquid in the cylinder block is guided to the outside through the gap (3B) of the eccentric part (3). In this way, the hydraulic engine operates as a motor, but when the shaft is rotationally driven, conversely, the gap (3A) or (3A) of the eccentric portion (3)
A fluid pressure is generated in B), and the pump function is exhibited.

By the way, the present invention is characterized by a supply / discharge mechanism for performing the transfer of liquid between the gaps (3A) and (3B) and the outside, that is, the supply / discharge, in the above configuration. This is shown in FIGS. 1 and 2.

FIG. 2 is a diagram viewed from the AA plane (step surface) in FIG. 1 and shows only a main part in cross section.

In the present invention, a circular hole (2H) having a fixed length (length up to the position of the eccentric portion (3) between the two bearings) is formed in the shaft (2) from the left side on the axis thereof. Circular hole (2
The cylindrical body (5) is inserted in H).

At the insertion end of the cylindrical body (5), small diameter portions (G) and (N) divided into two in the axial direction are formed. A pair of channels (5A) and (5B) are bored in the cylindrical portion (5) in the axial direction, and the outer ends thereof are provided with supply ports (discharge ports) (A) (A) ( B). The insertion inner ends of the flow paths (5A) and (5B) are respectively connected to the communication holes (AL) (AR) of the small diameter portions (G) and (N).

The small diameter portions (G) and (N) are provided at a certain distance in the longitudinal direction.
The relationship between the two is set so that (N) enters the longitudinal direction of the gaps (3A) and (3B) of the eccentric part (3).

As is clear from FIGS. 1 and 2, one small-diameter portion (G) is a communication hole (AL) formed in the eccentric portion (3).
And the other small diameter portion (N) is also connected to the gap (3A) via the communication hole (AR).

A large diameter portion is formed between the small diameter portions (G) and (N) and a seal (S) is interposed between the small diameter portions (G) and (N) so that the small diameter portions (G) and (N) are not connected to each other. I have. The bottom of the insertion end of the cylindrical body (5) is connected to the inside of the case through a return hole (5R) formed in the cylindrical body (5). 5) It is devised to prevent the left thrust from being generated.

By the cooperation of the cylindrical body (5) and the flow passages (5A) (5B) and the shaft (2) formed in the cylindrical body (5) and the gaps (3A) (3B) of the eccentric part (3) in particular, It is configured to supply and discharge the liquid appropriately.

When operated as a motor, hydraulic pressure is introduced from the supply port (A) and discharged from the discharge port (B) to generate torque in the shaft (2). When operated as a pump, the shaft (2) is used. Is driven to output a hydraulic pressure to the discharge port (B). Of course, it is possible to freely select which side of the openings (A) and (B) generates hydraulic pressure or generates hydraulic pressure depending on the rotation direction of the shaft.

In the example shown, a cover (5C) that fixes and holds the cylindrical body (5)
Is made of a material integral with the cylindrical body (5), but it can also be made as a separate body. In short, the cylindrical body (5) only needs to be fixedly held.

The cylindrical body (5) may be swingable with respect to the cover and held so as not to rotate. In this case, even if the shaft (2) vibrates by rotation, the cylinder (5) floats, and the gap between the hole (2H) of the shaft (2) and the outer periphery of the cylinder (5) is kept constant. Problems such as liquid leakage are eliminated. The cylindrical body (5) may be penetrated through the cover and fixedly held by another fixing member.

In FIG. 1, (11) is a frame required for fixing, which is integrated with the casing (1) by a fixing screw (12), and (7) is a bearing holding frame, and the casing is formed by a fixing screw (8). It is integrated with (1).

Reference numeral (13) denotes a pin which constitutes a regulating mechanism for causing the cylinder block (6) to squeeze within a certain range, and is locked to a regulating ring (14) fixed to the casing (1).

(G) Effect Since the present invention has been described in detail above, the liquid supply / discharge mechanism is placed inside the shaft, which makes it possible to reduce the weight and size of the hydraulic engine and insert the cylindrical body. Since the hydraulic pressure generated at the shaft end is discharged into the casing through the return hole, the thrust force acting on the cylindrical body, that is, the thrust force acting on the shaft is prevented, and the rotation of the lubricated shaft, and thus the fluid The pressure engine can be operated smoothly.

[Brief description of the drawings]

1 is a longitudinal sectional view of a hydraulic engine according to the present invention. FIG. 2 is a sectional view of FIG. 1 along AA, and FIG. 3 is a drawing for explaining the operation of the hydraulic engine. (1) ... casing, (2) ... shaft, (3) ...
… Eccentric part, (2H) …… hole, (3A) (3B) …… void,
(4) ... radial piston, (5) ... cylindrical body, (5
A) (5B) ... flow path, (AR) (AL) ... communication hole, (5R)
…… Return hole, (9) (10) …… Bearing, (G) (N)
…… Small diameter part.

Claims (1)

(57) [Claims] An eccentric portion provided on a part of a shaft is accommodated in a casing, and a plurality of pistons are radially arranged around the eccentric portion in the casing, and the eccentric portion is provided in a central hole of a cylinder blotter. Fit and insert each piston into the cylinder hole of the cylinder block,
A liquid supply / discharge mechanism that supplies / discharges liquid to / from the cylinder holes of the cylinder blotters on the shaft is provided. In an engine that functions as a pump or a motor when the shaft rotates, the liquid supply / discharge mechanism includes: Along with the shaft support bearing is inserted on the shaft center of the shaft up to the middle of the shaft support, and a liquid supply port and a discharge port to each cylinder hole and respective flow paths connected thereto,
A hydraulic engine comprising: a cylindrical body having a return hole connected to the inside of the casing from the bottom of the insertion end; and fixed holding means for fixedly holding the cylindrical body on the casing side.