JPS5999074A - Radial piston type hydraulic rotary machine - Google Patents

Abstract

PURPOSE:To improve a volumetric efficiency and reduce noise by a method wherein a plurality of column type cylinder forming members, rotatable about an axial line parallel to the axial direction thereof, are provided on a rotor rotating eccentrically with respect to the sliding surface of a casing and pistons are fitted into each members. CONSTITUTION:When the rotor 21, eccentric with respect to the sliding surface 2A, is rotated through a rotating shaft 5 in the hydraulic rotary machine as a hydraulic pump 1, the piston 11 reciprocates in a cylinder chamber 24 and operating oil, sucked from a suction port 15, is discharged from a delivery port 14 after being pressurized. In this case, the cyliner chamber 24 is formed in the column type cylinder forming member 23 fitted pivotably into cylindrical holes 22 formed in the axial direction of the rotor 21. The piston 11, equipped with a shoe 11A at the tip end thereof, is inserted into the cyliner chamber 24 provided in the forming member 23. Each cylinder chambers 24 communicate the rotor 21 with each ports 14, 15 selectively through fluid paths 16 provided on the rotor 21 in the radial direction thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention applies to a hydraulic rotating machine used as a radial biston type hydraulic 7'' or hydraulic motor.

FIGS. 1 and 2 show a hydraulic pump as a radial piston type hydraulic rotary machine according to the prior art.

In the figure, reference numeral 1 denotes a main body casing of a hydraulic pump, and a ring-shaped sliding member 2 having two inner surfaces and eight sides is fixedly provided on the inner circumference of the casing l. 1
fc, a bottle valve 3 is provided in a protruding manner within the casing 1, and the bottle valve 3 is provided at a position eccentric to the sliding surface 2A. A rotor 4 is rotatably fitted into the bottle valve 3, and a rotating rotor 4 is provided in the rotor 4 so as to protrude into the casing 1 so as to be opposed to the bottle valve 3. +115 is connected by Pol)6.6,... A plurality of stepped cylinders 7 are bored in the rotor 4 in its radial direction from its outer circumferential surface toward the center, each consisting of a large-diameter cylinder 7A and a small-diameter cylinder 7B. 8 is the large diameter cylinder 7AK
The spherical receiving portion 8 is press-fitted, and the spherical receiving portion 8 is fixedly held between the retainer ring 9 and the stepped portion of the large-diameter cylinder 7A by a retainer ring 9 provided on the inner wall of the large-diameter cylinder 7A. There is. IO is swingably attached to the spherical receiving part 8.
'111 lowered spherical body, said sphere 1 River Uto 8 and spherical body 10
and constitute a spherical bearing.

The casing 11 is a piston that is bored in the spherical body 10 and is fitted into the through hole 10A so as to be able to swing freely.The tip of the piston 11 is swingably connected to the shoe 11A. 11A follows the rotation of the rotor 4 and can slide on two people.

Reference numerals 12.13 and 12.13 indicate suction and exhaust passages formed in the bottle valve 3, and each suction and discharge passage 12.13 opens into a suction and discharge port 14.15 formed in an arc shape on the circumferential surface of the bottle valve 3, respectively. On the other hand, the rotor 4 has a small diameter cylinder 7B.
A fluid passage 16 is bored through which the fluid passage 16 communicates intermittently with the suction/exhaust port (14, 15). The small diameter cylinder 7B formed on the rotor 4 is closed on the large diameter cylinder 7A side by the spherical receiving portion 8, the spherical body 10, and the piston 11, so that the small diameter cylinder 7B has an intake/exhaust port)14.
The entire cylinder chamber is formed to pressurize the hydraulic fluid sucked in from one port of the port 15 and discharge it to the other port.

The hydraulic pump according to the prior art has the above-mentioned configuration, and its one downward movement will be explained assuming that the suction and exhaust ports 15 are all suction ports and the suction and exhaust ports 14 are discharge ports (f-).

Thus, when the rotating shaft 5 is rotated by the rotating shaft 1iQ), the rotor 4 is rotated following the rotating shaft 1iQ). The rotor 4
Since the piston 11 is eccentrically provided in favor of the active surface 2A, the piston 11 is caused to reciprocate within the cylinder 7 while the rotor 4 is rotating. While the small-diameter cylinder 7B that forms the entire cylinder chamber communicates with the suction port 15 via the fluid passage 16, the piston 1ist extends radially outward from the small-diameter cylinder 7B and enters a suction stroke in which hydraulic oil is sucked from the passage 13. . On the other hand, the small diameter cylinder 7B is
During the communication with the piston 11, the piston 11 enters the small diameter cylinder 7B, pressurizes the oil in the small diameter cylinder 7R, valves the discharge port 14'ff, and discharges the oil into the passage 12. Become. The 9471 action is performed by repeating this suction stroke and discharge stroke.

By the way, since the radial piston J9 rotates the rotor 4 eccentrically with respect to the sliding ini 2 A, the piston 11 reciprocates within the cylinder 7 and is also rocked back and forth in the rotational direction. In the conventional technology, the piston 11 has a large diameter cylinder 7A.
In order to freely support the large diameter cylinder 7A and the piston 11, a spherical bearing consisting of a spherical bearing part 8 and a spherical body 10 is interposed, and the spherical body 10 is slidably connected to the spherical bearing part 8. This configuration allows the piston 11 to swing.

In addition, in order to prevent the piston 11 from colliding with the internal space of the small diameter cylinder 7B even if the piston 11 swings, the inner diameter of the small diameter cylinder 7B is larger than the diameter of the piston 11. are doing.

Therefore, the prior art hydraulic rotation system having the above-mentioned implantation has the following disadvantages. First, in order to support the piston 11 in the large-diameter cylinder 7A, a spherical receiving portion 8 is installed between the spherical body 1O fitted into the cylinder 7 and the large-diameter cylinder 7A, and the spherical receiving portion 1f The part 8 must be supported by a retainer ring 9 as a kite, which increases the number of parts and increases the number of hydraulic rotation parts. be.

Second, since the small diameter cylinder 7B that forms the entire cylinder chamber must be made larger in diameter than the piston 11, a considerable amount of hydraulic fluid is discharged even at the top dead center position when the piston ti has entered the small diameter cylinder 7B the most. In this state, the small diameter cylinder 7B is communicated with the suction port 15 on the low pressure side. Therefore, the non-discharge operation of the hydraulic oil at the top dead center position of the piston 11 described above becomes a dead volume of the hydraulic rotating rod, and when the high pressure hydraulic oil remaining in this dead volume returns to the low pressure side. The expanding body 41i'i has the disadvantage of causing apparent leakage and reducing the efficiency of the hydraulic rotary machine. As for the housing, when the dead volume becomes large, the cylinder pressure hydraulic oil flows into the low pressure side, which causes pulsation and increases noise.

Thirdly, since the hydraulic pressure in the small diameter cylinder 7B is received not only by the end face of the piston 11 but also by the end face of the spherical body 10, when the hydraulic rotating machine is operated at high pressure, the spherical body The body lO is pressed outward in the radial direction of the rotor 4 and is brought into pressure contact with the spherical receiving portion 8. For this reason, the spherical body I
Sliding between O and spherical receiver 8! There is also the drawback that the lubricating oil film runs out at the 1rIJ part and metal contacts occur, causing seizure, galling, etc.

The present invention has been made in view of the above-mentioned shortcomings of the prior art, and provides a radial piston type hydraulic rotating machine having a front wheel configuration and having a cylinder chamber with a small dead volume.

In order to achieve the above-mentioned object, the radial piston type hydraulic rotating machine according to the present invention includes a rotor that rotates eccentrically with respect to a sliding surface formed in the inner peripheral wall of the casing.
A plurality of circular 10J-shaped holes are bored in the rotor in the +1111 direction, and a cylindrical cylinder forming member is fitted into the holes in the first position IJ, and the cylinder forming part old A cylinder chamber is formed in a direction perpendicular to the axis thereof, a piston is slidably inserted into each cylinder chamber, and a shoe is provided at the tip of each piston to make sliding contact with the sliding surface) :b'
Its distinctive feature is that it is J-structured.

With this configuration, the piston can be reciprocated while sliding along the inner wall of the cylinder chamber, and the swinging of the piston back and forth in the rotational direction of the rotor causes the cylinder forming part to move along the hole in the rotor. This can be done by rotating the button.

Therefore, it is only necessary to fit the cylinder forming member into the hole of the rotor and lower the piston into the cylinder chamber provided in the cylinder forming member, but the structure is extremely simple, and the assembly is easy. , it is possible to downsize the hydraulic rotation unit. Furthermore, since the piston is configured to move directly with the inner wall of the cylinder, the dead volume is minimized, and it is possible to improve volumetric efficiency and reduce pulsation. Moreover, since the hydraulic pressure in the cylinder chamber is received only by the piston, no radially outward pressing force 1l-J acts on the cylinder forming member, and between the cylinder forming member and the inner wall surface of the rotor hole. To? There is no risk of the oil film running out, and the l'N BJJJ
'(i = Various effects such as being able to run smoothly.

Hereinafter, based on Figures 3 to 5, the present invention will be carried out.
1 will be explained.

In this figure, the same components as in FIGS. 1 and 2 are designated by the same reference numerals, and their explanations will be omitted. However, 21 indicates a rotor, and the rotor 21 has a cylindrical hole 22. which penetrates in the axial direction, that is, in the thickness direction. ,2
2,... are drilled. Reference numeral 23 denotes a cylinder forming part formed in a cylindrical shape, and the cylinder forming member 23 inside the cylinder is provided with a through hole in the direction orthogonal to the axis of the cylinder forming member 23, that is, in the radial direction. It is rotatably fitted into the hole 22, and the 7 run portion 5A of the rotating shaft 5 is rotatably fitted into the hole 22.
and the stepped portion 3A of the bottle valve 3 to determine the position. The piston 11 is inserted into the cylinder chamber 24 through a follow-up hole 21Afc formed in the rotor 21, and the piston 11 slides along the inner wall of the cylinder chamber 24 to reciprocate. It is possible.

The hydraulic rotating machine according to the present invention has the above-described configuration.

, set port 15 to suction, ]e-1, and port 14
When used as a hydraulic pump with the pump as a discharge port, there is no particular difference in operation of the pump itself from that of the prior art described above.

That is, as the rotor 4 rotates, the piston 11 is caused to reciprocate within the cylinder chamber 24 by the shoe 11A that is in sliding contact with the drawing surface 2A, and all of the hydraulic oil is sucked into the cylinder chamber 24 from the suction port 15 during the suction stroke. In the discharge stroke, this hydraulic fluid is discharged to the discharge port 14 while being pressurized. By the way, during operation of the hydraulic pump, the piston 11 swings, but the swinging direction is in the front-rear direction in the rotation direction of the rotor 21, and in the direction perpendicular to the rotation direction.
−+! Don't be bullied. Here, piston 11
The cylinder forming part 23 is fitted into the cylinder forming part 23, and several cylinder forming parts 23 are rotatably mounted in the hole 22 bored in the axial direction of the rotor 21. By rotating 23 along the inner thickness of the hole 22,
It is possible to enable the piston 11 to swing in the rotational direction of the rotor 21.

As mentioned above, since the cylinder forming member 23 is rotated within the hole 22 following the rocking motion of the piston 11, the cylinder chamber 24 is also caused to swing following the rocking motion of the piston 11. . For this reason, the inner diameter of the cylinder chamber 24 is made almost the same as the diameter 'f= of the piston 11, and the piston 1
1 can be reciprocated while sliding along the inner wall of the cylinder chamber 24. In other words, the cylinder chamber 24 at the top dead center position of the piston 11.
The volume can be reduced by 13, making it possible to reduce the dead volume. As a result, the apparent 1) and reduce noise.

Further, during the discharge stroke of the hydraulic pump, the pressure inside the cylinder chamber 24 becomes high. Since the cylinder chamber 24 has a diameter larger than that of the fluid path 16, the pressure within the cylinder chamber 24 is received only by the piston 11, and the cylinder forming member 23 is given a force that presses it outward in the radial direction. has no effect. Therefore, the oil film of the gauging oil between the cylinder forming member 23 and the inner wall of the hole 22 does not run out, and the cylinder forming portion 23 can smoothly slide on the inner wall of the hole 22.

Finally, the cylinder forming member 23? : Fits into the rotor 21 (7) hole 22, and the cylinder forming part; 1" A23 is sandwiched between the stepped part 3A of the bottle valve 3 and the flange part 5A of the rotating shaft 5, and the piston 11 is inserted into the cylinder chamber 24. Since it is 1M DX so that it can be inserted through it, the groove structure is much simpler and the assembly (=J) is also easier.

Moreover, unlike the conventional technology, there is no need to form a large-diameter cylinder metal on the rotor, so the axial dimension of the rotor 21 can be shortened, and the hydraulic rotation can be compactly shaped. becomes.

In addition, in the above-described embodiment, the radial piston type hydraulic rotary ram according to the present invention is used as a hydraulic pump:l:!
, :S motor has been described, but it goes without saying that it may also be used as a hydraulic motor. Further, the hole 22 formed in the rotor 21 may not be a through hole, but may be a bottomed hole with one side of the rotor 21 closed. Further, instead of the bottle valve 3, a valve may be provided so that the cylinder forming member takes in and discharges the hydraulic oil.

[Brief explanation of the drawing]

rAE Figures 1 and 2 show the prior art, where Figure 1 is a vertical view of a hydraulic rotating machine, and Figure 21F<] is %p,'
] Cross-sectional view in the direction of the ■-■ arrow in the figure, Figure 3 to m 5
v1 &:, l: Shows an example of Akira Honzura, 21
Figure 33 shows the looseness of the hydraulic rotating machine (top view, Figure 4 and Figure 4 to 5).
The figure is a cross-sectional view in the direction of arrows -rv and vfv in FIG. 3. l...Casing, 2A...('SN Yamaji, surface 3.
... Bintle valve, 11... Piston, 11A...
Shoe, 21... Low 1'% 22... Hole, 23...
- Cylinder type gili material, 24... cylinder chamber. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A rotor is provided in the casing and rotates eccentrically Ib with respect to the sliding surface formed on the inner circumferential wall of the casing, and a plurality of cylindrical holes are bored in the 1llb direction of the rotor, and the name plate V is The cylindrical cylinder forming member is fitted into the rotating function,
A cylinder chamber is formed in the cylinder forming part in the direction of direct combustion with the axis thereof, a piston KJ is fitted in the cylinder head, and the sliding surface and the sliding surface are fitted in the tip of each piston. A radial piston hydraulic rotating machine equipped with a sliding seam.