JP5734007B2 - Rotary hydraulic device - Google Patents

Description

  The present invention relates to a gerotor-type rotary hydraulic device in which an external tooth member rotates and revolves within a fixed ring-shaped internal tooth member.

  Conventionally, as disclosed in Patent Document 1, a gerotor-type rotary hydraulic device, for example, a hydraulic motor, has a star-shaped external tooth member arranged eccentrically in a fixed ring-shaped internal tooth member. The high pressure liquid is sequentially supplied to a plurality of working chambers formed between the internal teeth of the tooth member and the external teeth of the external tooth member, and the low pressure liquid is sequentially discharged from the plurality of working chambers to external teeth. The member revolves while rotating, transmits the rotation of the external tooth member to a drive shaft that is spline-coupled with the external tooth member, and transmits the rotation to an external device or the like via the drive shaft.

JP-A-10-220340

  However, in such a conventional rotary hydraulic device, both sides of the internal tooth member and the external tooth member are sandwiched between the valve plate and the lid member, and both side surfaces of the external tooth member are slidably contacted with the sliding surface of the valve plate and the lid member. It is in sliding contact with the surface. Further, each port corresponding to each working chamber is formed in the sliding contact surface of the valve plate, and the valve member provided on the opposite side of the sliding contact surface of the valve plate is rotated synchronously with the external tooth member, The high-pressure side or low-pressure side flow path is communicated with a port.

  For this reason, when the external tooth member revolves while rotating, the side surface of the external tooth member slides on the sliding contact surface of the valve plate on which each port is formed. Cross. Therefore, the acting force based on the pressure of the high-pressure liquid at each port acts on the external tooth member in the axial direction, the external tooth member is pressed against the sliding surface of the lid member, and the torque transmitted to the drive shaft is reduced. There is a problem that the external tooth member may be seized.

  The subject of this invention is providing the rotary hydraulic device which can suppress the torque fall of the external tooth member by the action force based on the pressure of the pressure liquid which acts on an external tooth member to an axial direction, and seizing.

In order to achieve this problem, the present invention has taken the following measures in order to solve the problem. That is,
A ring-shaped internal tooth member having a plurality of internal teeth is fixedly arranged, and the external tooth member that meshes with the internal teeth and has one external tooth less than the internal teeth can be rotated and revolved eccentrically in the internal tooth member. A plurality of working chambers between the inner teeth of the inner tooth member and the outer teeth of the outer tooth member. Furthermore, each of the sliding contact surfaces is formed with an opening corresponding to each of the working chambers, and the high-pressure-side flow path is passed through the ports according to the rotation and revolution of the external tooth member. And a rotary hydraulic device having a valve mechanism that sequentially communicates the low-pressure side flow path to each working chamber ,
A rotary hydraulic device is characterized in that a recess having substantially the same opening shape as the port is formed in the other sliding contact surface corresponding to each port.

  At that time, the opening shape of the port and the opening shape of the recess are connected to the first opening portion extending outward from the radial center side and the outer end of the first opening portion and extending in the circumferential direction. A substantially T-shaped configuration including the second opening may be used.

  In the rotary hydraulic device according to the present invention, the recess having substantially the same opening shape as the port is formed on the other sliding contact surface corresponding to each port, so that the pressure liquid acting in the axial direction on the external tooth member is formed. Since the acting force based on the pressure acts on both side surfaces of the external tooth member in equilibrium and the external tooth member is prevented from being pressed against the sliding contact surface, the torque reduction and seizure of the external tooth member can be suppressed. .

  Further, the opening shape of the port and the opening shape of the recess are connected to the first opening portion extending from the radial center side to the outer side and the outer end of the first opening portion, and the second opening portion extending in the circumferential direction. Therefore, a large opening area of the port can be taken, the pressure drop of the liquid can be reduced, and the torque reduction can be further prevented.

It is a longitudinal cross-sectional view of the rotary hydraulic device as one embodiment of the present invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the rotary hydraulic apparatus of this invention as a hydraulic motor is demonstrated in detail based on drawing.
As shown in FIGS. 1 and 2, reference numeral 1 denotes a ring-shaped internal tooth member. In the present embodiment, the internal tooth member 1 is composed of nine roller-shaped inner teeth arranged at equal intervals on the same circumference. An internal tooth 2 is provided. An external tooth member 4 is arranged eccentrically with respect to the center of the internal tooth member 1 inside the internal tooth member 1, and eight external teeth 6, which are one fewer than the internal teeth 2, on the outer periphery of the external tooth member 4. Is formed. The external teeth 6 of the external tooth member 4 are formed so as to internally mesh with the internal teeth 2 of the internal tooth member 1.

  Both sides of the internal tooth member 1 and the external tooth member 4 are sandwiched between the valve plate 8 and the lid member 10, and both side surfaces 4 a and 4 b of the external tooth member 4 are covered with the sliding contact surface 8 a of the valve plate 8 and the lid. The sliding contact surface 10a of the member 10 is slidably contacted. As a result, the external tooth member 4 is arranged in an eccentric manner inside the internal tooth member 1 so as to be capable of rotating and revolving, and a plurality of external tooth members 4 are provided between the internal teeth 2 of the internal tooth member 1 and the external teeth 6 of the external tooth member 4. The working chambers 12 are divided into nine working chambers 12 in this embodiment.

  A housing member 14 is disposed on the opposite side of the sliding contact surface 8 a of the valve plate 8, and the housing member 14, the valve plate 8, the internal gear member 1, and the lid member 10 are fastened and fixed by a plurality of bolts 15.

  A housing chamber 16 is formed in the housing member 14 on the valve plate 8 side, and a valve member 18 is housed in the housing chamber 16. The valve member 18 is slidably contacted with the valve plate 8, and a liner member 20 is interposed between the valve member 18 and the bottom of the storage chamber 16. The valve member 18 is placed in the storage chamber 16. It is arranged so that it can rotate.

  A spline hole 22 is formed through the center of the external tooth member 4, and the spline shaft portion 24 a of the drive shaft 24 is inserted into the spline hole 22 so that the drive shaft 24 can swing. And the drive shaft 24 are spline-coupled. The drive shaft 24 extends to the outside through a through hole 26 formed in the center of the lid member 10.

  Further, the spline hole 22 of the external tooth member 4 is inserted into the spline shaft portion 28a of the valve drive shaft 28 from the opposite side of the drive shaft 24 so that the valve drive shaft 28 can swing so that the valve drive shaft 28 can swing. The shaft 28 is splined.

  The valve drive shaft 28 extends into the storage chamber 16 through a through hole 30 formed through the center of the valve plate 8. A spline shaft portion 28 b is also formed at the storage chamber 16 side end of the valve drive shaft 28, and the spline shaft portion 28 b is inserted into a spline hole 32 formed at the center of the valve member 18, so that the valve drive shaft 28 is rocked. The valve member 18 and the valve drive shaft 28 are splined so that they can move. Thus, the external tooth member 4 and the valve member 18 are configured to rotate synchronously via the valve drive shaft 28. The center of the spline hole 32 of the valve member 18 and the center of the inner tooth 2 of the inner tooth member 1 are arranged concentrically.

  A first supply / discharge passage 34 is formed in the housing member 14 at the bottom of the storage chamber 16. The first supply / discharge passage 34 is a discharge port of a hydraulic pump as a high pressure side (not shown) or a low pressure side (not shown). Connected to the suction port of the hydraulic pump. A first connection hole 36 formed in the valve member 18 is communicated with the first supply / discharge path 34, and the first connection hole 36 is opened on a side surface of the valve member 18 on the valve plate 8 side.

  Further, a second supply / discharge passage 38 is formed between the inner wall of the storage chamber 16 and the outer wall of the valve member 18, and the second supply / discharge passage 38 is a suction port of a hydraulic pump as a low pressure side (not shown) or It is connected to a discharge port of a hydraulic pressure port as a high pressure side (not shown). A second connection hole 40 formed in the valve member 18 communicates with the second supply / discharge path 38, and the second connection hole 40 is opened on a side surface of the valve member 18 on the valve plate 8 side.

  In the present embodiment, as shown in FIG. 3, eight first connection holes 36 and eight second connection holes 40 are formed, and the first connection holes 36 and the second connection holes 40 are formed on the same circumference. Are alternately arranged at equal intervals and opened on the side surface of the valve member 18 on the valve plate 8 side.

  As shown in FIGS. 1, 2, and 4, the valve plate 8 is formed with a communication hole 42, and the communication hole 42 communicates with a port 44 formed in the sliding contact surface 8 a. In the present embodiment, nine communication holes 42 and nine ports 44 are formed, respectively, and are formed at equal intervals on the same circumference corresponding to each working chamber 12. The opening shape of the port 44 is substantially composed of a first opening 44a extending outward from the radial center and a second opening 44b connected to the outer end of the first opening 44a and extending in the circumferential direction. It is formed in a T shape. 2 and 3, the position of the port 44 is indicated by being overlapped with a broken line.

  Each second opening 44b is formed on the same circumference as the circumference in which each working chamber 12 is formed, and each working chamber 12 and each second opening 44b are in one-to-one correspondence with each other at all times. It is configured to communicate. The length of the second opening 44b in the circumferential direction is formed to be substantially the same as the length of the working chamber 12 in the circumferential direction.

  The first opening 44a is formed in the slidable contact surface 8a where the side surfaces 4a of the external tooth member 4 overlap each other during the slidable contact, and the communication hole 42 is connected to the first opening 44a. The first opening 44a is formed to extend outward from the center side in the radial direction, the second opening 44b is formed to extend in the circumferential direction, and the port 44 is formed in a substantially T shape. The opening area of 44 can be made sufficiently large, and the flow path resistance can be reduced. In the present embodiment, a valve mechanism 45 is configured by the valve plate 8, the valve member 18, and the valve drive shaft 28.

  The valve member 18 is formed with a lubricating oil passage 46 communicating with the spline hole 32 from the liner member 20 side of the valve member 18, and the valve member 18 and the valve drive shaft 28 are connected via the lubricating oil passage 46. Lubricating oil is supplied to the spline connecting portion between the outer tooth member 4 and the valve drive shaft 28. The housing member 14, the valve plate 8, the internal tooth member 1, and the lid member 10 are also formed with a lubricating oil flow path 47, and the spline between the internal tooth member 1 and the drive shaft 24 via the lubricating oil flow path 47. Supply lubricant to the joint.

  On the other hand, as shown in FIG. 5, nine recesses 48 are formed in the sliding contact surface 10 a of the lid member 10. The recess 48 opens to the side surface 4 b side of the external tooth member 4, and the opening shape of the recess 48 is substantially the same as the port 44 of the sliding contact surface 8 a of the valve plate 8. That is, the opening area and position of the opening shape of the recess 48 are equal to the opening area and position of the port 44, and the recess 48 is formed opposite to each port 44 with the inner tooth member 1 and the outer tooth member 4 in between. Has been.

  In the present embodiment, like the port 44, the opening shape of the recess 48 is connected to the first opening 48a extending outward from the radial center and the outer end of the first opening 48a in the circumferential direction. The second opening 48b extends in a substantially T-shape. The depth of the recess 48 is the same for the first opening 48a and the second opening 48b, and is formed to such an extent that liquid can flow.

  Each second opening 48b is formed on the same circumference as the circumference in which each working chamber 12 is formed, and each working chamber 12 and each second opening 48b always correspond one-to-one with each other. The second opening 44b of the sliding contact surface 8a and the second opening 48b of the sliding contact surface 10a communicate with each other through the working chamber 12.

  In addition, the circumferential length of the second opening 48b is formed to be substantially the same as the circumferential length of the working chamber 12. The first opening 48a is formed in the slidable contact surface 10a where the side surface 4b of the external tooth member 4 overlaps during slidable contact.

Next, the operation of the above-described rotary hydraulic device of the present embodiment will be described.
A discharge port of a hydraulic pump (not shown) is connected to the first supply / discharge passage 34, a suction port of a hydraulic pump (not shown) is connected to the second supply / discharge passage 38, and a hydraulic pressure (not shown) is connected to the first supply / discharge passage 34. When high-pressure liquid is supplied from the discharge port of the pump, the pressure liquid is supplied to some of the communication holes 42 via the first connection holes 36. Pressure fluid is supplied from the communication hole 42 to the working chamber 12 via the port 44, and the pressure of the liquid acts on the external tooth member 4 in the direction in which the volume of the working chamber 12 increases. In addition, the liquid in the working chamber 12 is discharged from the other part of the communication hole 42 to the second connection hole 40 through the port 44, and is hydraulic pump from the second connection hole 40 through the second supply / discharge path 38. Inhaled into the inhalation port.

  In the state shown in FIGS. 2 and 3, the first connection hole 36 is communicated with each communication hole 42 and its port 44 on the right side of the drawing to supply the pressurized liquid, and corresponding to each working chamber 12 on the right side of the drawing. The external tooth member 4 rotates in the direction of the arrow in FIG. 2 where the pressurized liquid is supplied and the volume of the working chamber 12 increases. And the 2nd connection hole 40 is connected to each communication hole 42 and its port 44 on the left side of a figure, and a low pressure liquid is discharged | emitted.

  As shown by the arrow in FIG. 2, the external tooth member 4 revolves while rotating inside the internal tooth member 1 by supplying and discharging the pressure fluid to and from the working chamber 12. The valve member 18 rotates synchronously via the external tooth member 4 and the valve drive shaft 28, and the first connection hole 36 and the second connection hole 40 are sequentially communicated with the communication hole 42. The internal tooth member 1 and the valve plate 8 are fixed, and the positions of the working chambers 12 and the ports 44 do not change (do not rotate).

  The working chamber 12 changes in volume for one cycle from the maximum volume to the minimum volume while the external tooth member 4 rotates 1/8. In the first half of this one cycle, the first connection hole 36 communicates with the communication hole 42 and supplies the working fluid 12 to the working chamber 12 via the port 44. In the second half of the subsequent one cycle, the second connection hole 40 communicates with the communication hole 42 and the liquid in the working chamber 12 is discharged through the port 44. With the rotation of the external tooth member 4, the supply and discharge of the pressure fluid is repeated continuously in the working chamber 12, and the supply and discharge of the pressure fluid is repeated in the nine working chambers 12 in a state where the phases are shifted from each other.

  At that time, both side surfaces 4 a and 4 b of the external tooth member 4 rotate while slidingly contacting the sliding contact surface 8 a of the valve plate 8 and the sliding contact surface 10 a of the lid member 10. The drive shaft 24 transmits the rotation of the external tooth member 4 to drive another external device (not shown) connected to the drive shaft 24.

  On the sliding contact surface 8 a of the valve plate 8, the pressure of the liquid supplied to the port 44 communicating with the first connection hole 36 acts on the side surface 4 a of the external tooth member 4, so that the external tooth member 4 is covered with the lid member 10 to the sliding contact surface 10a side. On the other hand, pressurized liquid is supplied to the recess 48 formed in the sliding contact surface 10 a of the lid member 10 via the action chamber 12, and the pressure of the liquid supplied to the recess 48 acts on the side surface 4 b of the external tooth member 4. Then, the external tooth member 4 is pressed toward the sliding contact surface 8a side of the valve plate 8 in the axial direction.

  Since the opening shape of the recess 48 and the opening shape of the port 44 are substantially the same shape, the acting force in the axial direction acting on the external tooth member 4 is substantially the same, and the acting force in the axial direction balances and cancels each other. The side surfaces 4a and 4b of the external tooth member 4 are not pressed against the sliding contact surfaces 8a and 10a, and torque reduction and seizure can be suppressed.

  As shown in FIGS. 2 and 3, the first connection hole 36 communicates with the port 44 on the right side of the figure, and the second connection hole 40 communicates with the port 44 on the left side of the figure. A large acting force in the axial direction due to the pressure of the liquid acts on one side of the right side, and a small acting force in the axial direction due to the pressure of the liquid on the left side. Due to the recess 48 having substantially the same opening shape in the port 44, the axial action force due to the liquid pressure acts in the same way on the right side of the external tooth member 4, and the axial action due to the liquid pressure occurs on the left side. The power is small. Accordingly, the acting forces act in a balanced manner to cancel each other, and no axial pressing force is generated.

  Further, in the nine working chambers 12, the pressure liquid is supplied and discharged in a state where the phases are gradually shifted, and the port 44 to which the pressure liquid is supplied also moves sequentially with the rotation of the external tooth member 4. Since the hydraulic pressures of the port 44 and the recess 48 communicating with each other via the working chamber 12 are the same, the working forces are balanced and cancel each other at any rotational position, and an axial pressing force is generated. Absent.

  When the external tooth member 4 revolves while rotating, the overlap between the port 44 and the side surface 4a of the external tooth member 4 changes in a complicated manner, but the opening shape of the port 44 and the recess 48 corresponds to the size and position of the shape. Therefore, even if the overlap changes and the acting force in the axial direction changes, the overlap between the recess 48 and the side surface 4b of the external tooth member 4 changes in the same way, so that the acting force is balanced. Act and cancel each other.

  In the present embodiment, the discharge port of the hydraulic pump is connected to the first supply / discharge passage 34, and the suction port of the hydraulic pump is connected to the second supply / discharge passage 38. When the suction port of the hydraulic pump is connected to the first supply / discharge passage 34 and the discharge port of the hydraulic pump is connected to the second supply / discharge passage 38, the external tooth member 4 rotates in the direction opposite to the arrow in FIG. . Even in that case, similarly, the acting force in the axial direction balances and cancels each other.

  In the present embodiment, the rotary hydraulic pressure device is used as a hydraulic motor. However, the present invention is not limited to this. For example, an actuator and a tank are provided in the first supply / discharge passage 34 and the second supply / discharge passage 38. Are connected to each other, the output shaft of the electric motor is connected to the drive shaft 24, the drive shaft 24 is rotationally driven, and the rotary hydraulic device can also be used as a hydraulic pump. Even in that case, similarly, the acting force in the axial direction balances and cancels each other.

  The present invention is not limited to such embodiments as described above, and can be implemented in various modes without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Internal tooth member 2 ... Internal tooth 4 ... External tooth member 4a, 4b ... Side surface 6 ... External tooth 8 ... Valve plate 8a ... Sliding contact surface 10 ... Lid member 10a ... Sliding contact surface 12 ... Working chamber 14 ... Housing member 15 ... Bolt 16 ... Storage chamber 18 ... Valve member 24 ... Drive shaft 28 ... Valve drive shaft 34 ... First supply / discharge path 36 ... First connection hole 38 ... Second supply / discharge path 40 ... Second connection hole 42 ... Communication hole 44 ... port 44a ... first opening 44b ... second opening 45 ... valve mechanism 48 ... depression 48a ... first opening 48b ... second opening

Claims (2)

A ring-shaped internal tooth member having a plurality of internal teeth is fixedly arranged, and the external tooth member that meshes with the internal teeth and has one external tooth less than the internal teeth can be rotated and revolved eccentrically in the internal tooth member. A plurality of working chambers between the inner teeth of the inner tooth member and the outer teeth of the outer tooth member. Furthermore, each of the sliding contact surfaces is formed with an opening corresponding to each of the working chambers, and the high-pressure-side flow path is passed through the ports according to the rotation and revolution of the external tooth member. And a rotary hydraulic device having a valve mechanism that sequentially communicates the low-pressure side flow path to each working chamber ,
A rotary hydraulic pressure device, wherein a recess having substantially the same opening shape as the port is formed on the other sliding contact surface corresponding to each port. The opening shape of the port and the opening shape of the recess are a first opening extending outward from the radial center side and a second opening extending in the circumferential direction connected to the outer end of the first opening. The rotary hydraulic apparatus according to claim 1, wherein the rotary hydraulic apparatus has a substantially T shape including a portion.

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