JP5316876B2 - Pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump device which can eliminate a need of newly installing a driving member for driving a valve function, can simplify a structure, has therein the valve function, and is compact and inexpensive. <P>SOLUTION: In the pump device, an electric motor 8 rotates a drive shaft 7 via a first one-way clutch 41 in a first rotational direction X1, to thereby drive and rotate a rotor 6. This allows the pump device to function as an ordinary pump. The electric motor 8 rotates and displaces the drive shaft 7 via a second one-way clutch 42 in a second rotational direction X2 in a predetermined amount, to thereby rotate and displace a port block 4. Thus, a suction opening 29 and a discharge opening 30 of the port block 4 are respectively switched between a first state of communicating with one pair (a first suction opening 31 and a first discharge opening 32) in the casing 3 and a second state of communicating with the other pair (a second suction opening and a second discharge opening) in the casing 3. This makes it possible for the pump device to function as a valve. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a pump device.

When the discharge oil from the hydraulic pump is selectively supplied to a plurality of hydraulic devices, it is necessary to provide a switching valve in each external pipe to each hydraulic device.
On the other hand, the second pressure regulating valve and the electromagnetic valve are provided in parallel in the return oil passage of the first pressure regulating valve of the pump discharge section, and the first and second pressure regulating valves and the electromagnetic valve are provided integrally with the pump case. A pump device has been proposed (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 4-79982

In Patent Document 1, an electromagnetic valve is opened and closed in accordance with the operation of an opening / closing switch, thereby switching the internal oil passage of the pump device to obtain a strong and weak two-stage discharge pressure.
However, a driving member such as a solenoid for driving the electromagnetic valve is required separately from a driving member such as an electric motor for driving the pump rotor. For this reason, the structure of a pump apparatus becomes complicated and a pump apparatus becomes large sized.

  The present invention has been made in view of the above problems, and an object thereof is to provide a small and inexpensive pump device.

  In order to achieve the above object, an aspect of the present invention includes a port block (4) rotatably accommodated in a cavity (2) of a casing (3), and a rotor chamber (5) formed in the port block. And the rotor (6) housed in the first and second rotation directions (X1, X2) opposite to each other and the rotor, and the first rotation. A first one-way clutch (41) that transmits only rotation in a direction, and a second one-way clutch that is interposed between the drive shaft and the port block and transmits only rotation in the second rotation direction (42), and the port block includes a suction hole and a discharge hole (29, 30) respectively communicating with the rotor chamber, and the casing includes a plurality of pairs of the suction hole and the discharge hole (31, 32, 33). , 34) As the shaft is rotated in the first rotational direction, the rotor is rotationally driven via the first one-way clutch, and as the drive shaft is rotated in the second rotational direction. The port block is rotationally displaced via the second one-way clutch, and as a result, the suction hole and the discharge hole of the port block communicate with any one of the suction hole and the discharge hole of the casing. A pump device that can be switched to is provided.

  In this aspect, by rotating the drive shaft in the first rotation direction, the rotor can be rotationally driven to perform a normal pump function. Further, by rotating and displacing the drive shaft in the second rotation direction and rotating the port block, the pair of suction holes and discharge holes of the port block are communicated with any of the suction holes and discharge holes of the casing. Thus, the valve function of switching can be achieved. There is no need to provide a separate drive member for driving the valve function, and the structure can be simplified. In addition, since the valve function is built in, piping to a conventional external valve becomes unnecessary.

  In one aspect of the present invention, the suction holes and the discharge holes of the port block include ports (29b, 30b) that open to the surface (4b) of the port block, and the plurality of pairs of the suction ports of the casing The hole and the discharge hole include ports (31a, 32a, 33a, 34a) facing the surface of the port block, and the suction hole of the port block and the port of the discharge hole are rotations of the port block. Depending on the position, it can be connected to a corresponding pair of the suction hole and the port of the discharge hole of the casing, respectively (claim 2).

In this aspect, according to the rotational position of the port block, the valve function is achieved by connecting the suction hole and discharge port on the surface of the port block to the corresponding pair of suction hole and discharge port of the casing. Can be easily realized.
In a certain aspect, the present invention includes a speed reduction mechanism (43) that decelerates the rotation of the second one-way clutch and transmits it to the port block. In this aspect, since the speed reduction mechanism is used, the port block can be reliably rotated by the torque of the drive shaft.

  In one aspect, the present invention includes a lock mechanism (55) capable of locking the position of the port block, and the lock mechanism only allows rotation of the port block by rotation transmission from the second one-way clutch. And a ratchet mechanism (55). In this aspect, the position of the port block can be reliably locked using the ratchet mechanism.

  In one aspect of the present invention, the ratchet mechanism includes a ratchet wheel (56) formed on an outer periphery of the port block and a ratchet pin that is held by the casing so as to be able to advance and retreat and can be locked to the ratchet wheel. (58) and an urging member (59) for elastically urging the ratchet pin toward the ratchet wheel portion (claim 5). In this aspect, the ratchet mechanism as the lock mechanism can be configured with a simple structure using the ratchet wheel portion formed in the port block and the ratchet pin biased by the biasing member.

  In the above description, the alphanumeric characters in parentheses represent reference numerals of corresponding components in the embodiments described later, but the scope of the claims is not limited by these reference numerals.

It is a schematic sectional drawing of the electric pump unit containing the pump apparatus of one embodiment of this invention. It is sectional drawing which follows the II-II line | wire of FIG. It is sectional drawing which follows the III-III line | wire of FIG. (A) And (b) is a schematic sectional drawing of the principal part of a port block and a casing, respectively, and the state by which the connection state of the oil path of a port block and a casing was switched with the rotation displacement of a port block, respectively. Each is shown. It is the elements on larger scale of FIG. It is a typical perspective view of a deceleration mechanism. It is the schematic of a deceleration mechanism.

A preferred embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic sectional view of a pump device according to an embodiment of the present invention. As shown in FIG. 1, the pump device 1 is accommodated in a casing 3 having a cavity 2, a port block 4 rotatably accommodated in the cavity 2, and a rotor chamber 5 formed in the port block 4. The rotor 6 is provided with a drive shaft 7 that can rotate in the first and second rotational directions X1 and X2 and that selectively drives the port block 4 and the rotor 6 in accordance with the rotational direction.

  The pump device 1 is driven by an electric motor 8, and the pump device 1 and the electric motor 8 are integrally attached to constitute an electric pump unit 100. Specifically, the electric motor 8 has a motor housing 9 fixed to the casing 3 of the pump device 1 and a rotating shaft that can rotate forward and backward. The rotating shaft is a drive shaft of the pump device 1. 7 is formed integrally.

The casing 3 of the pump device 1 includes a cylindrical casing main body 15 having first and second end surfaces 15 a and 15 b and an end member 17 facing the second end surface 15 b of the casing main body 15.
In a state where the end surface 9a of the motor housing 9 and the first end surface 15a of the casing body 15 are in contact with each other, the motor housing 9 and the casing body 15 are fixed to each other by fastening bolts (not shown).

The cavity 2 is provided in the casing body 15 and is open to the first end face 15 a of the casing body 15. The casing body 15 has an insertion hole 18 that opens to the second end face 15 b, and the insertion hole 18 communicates with the cavity 2.
Between the end surface 9a of the motor housing 9 and the first end surface 15a of the casing body 15, an annular shape such as an O-ring accommodated in an accommodation groove formed in one of the end surface 9a and the first end surface 15a. It is sealed with a sealing member 21.

Further, an annular engagement protrusion 22 is formed on the end surface 9 a of the motor housing 9, and the engagement protrusion 22 is fitted to the inner periphery of the inlet of the cavity 2.
The port block 4 includes an annular port block body 24 having a recess 23 for forming the rotor chamber 5, and an end plate 25 that covers the recess 23 of the port block body 24. The end plate 25 is fixed to the port block body 24 by fastening bolts (not shown).

The port block 4 includes a first end face 4 a (corresponding to an end face of the end plate 25) facing the electric motor 8 side and a second end face 4 b (end face of the port block main body 24) facing the bottom of the cavity 2 of the casing 3. Equivalent).
A thrust bearing 26 such as a needle roller bearing is interposed between the first end surface 4 a of the port block 4 (corresponding to the end surface of the end plate 25) and the end surface 9 a of the motor housing 9. Thereby, the port block 4 can rotate smoothly in the cavity 2 of the casing 3.

The end plate 25 has a center hole 27, and the port block body 24 has a center hole 28 communicating with the recess 23. The drive shaft 7 is inserted through the center holes 27 and 28.
The port block 4 has a suction hole 29 and a discharge hole 30 respectively communicating with the rotor chamber 5. A suction port 29 a that opens to the rotor chamber 5 is provided at one end of the suction hole 29, and a discharge port 30 a that opens to the rotor chamber 5 is provided at one end of the discharge hole 30. As shown in FIG. 2, each of the suction port 29 a and the discharge port 30 a has a substantially arc shape, and is formed symmetrically with respect to the center of the rotor chamber 5.

Referring again to FIG. 1, ports 29 b opened to the second end face 4 b (corresponding to the end face of the port block body 24) as the surface of the port block 4 are provided at the other ends of the suction hole 29 and the discharge hole 30. 30b is provided.
On the other hand, the casing 3 has a plurality of pairs of suction holes and discharge holes that can communicate with the pair of suction holes 29 and discharge holes 30 of the port block 4. Specifically, as shown in FIG. 3, the casing body 15 of the casing 3 is provided with a pair of first suction holes 31 and first discharge holes 32, and a pair of second suction holes 33 and second discharge holes 34. Have. The first suction hole 31 and the second suction hole 33 are connected to the same hydraulic tank (not shown), and the first discharge hole 32 and the second discharge hole 34 are connected to different hydraulic devices.

  The casing 3 has a facing surface 35 that faces the second end surface 4 b of the port block 4 at the bottom of the cavity 2. At one end of each of the first suction hole 31 and the first discharge hole 32, a first suction port 31a and a first discharge port 32a that are opened on the facing surface 35 are provided. In addition, a second suction port 33a and a second discharge port 34a that are open to the facing surface 35 are provided at one ends of the second suction hole 33 and the second discharge hole 34, respectively.

  According to the rotational displacement of the port block 4, the port 29 b of the suction hole 29 of the port block 4 is communicated with the first suction port 31 a of the first suction hole 31 and the discharge hole 30 of the port block 4 as shown in FIG. The first port 30 b communicates with the first discharge port 32 a of the first discharge hole 32, the port 29 b of the suction hole 29 communicates with the second suction port 33 a of the second suction hole 33, and the discharge hole 30. The second port 30b can be switched to the second state where it is communicated with the second discharge port 34a of the second discharge hole 34. By switching between the first state and the second state, the suction source and the discharge destination of the pump device 1 are changed.

  On the facing surface 35 of the casing 3, annular sealing members 36 are accommodated in accommodating grooves that surround the ports 31 a, 32 a, 33 a, 34 a, respectively. As shown in FIG. 5, as the sealing member 36, an annular resin member 37 having a seal surface that is in sliding contact with the second surface 4b of the port block 4, and the resin member 37 are elastically applied to the second surface 4b. The structure which has elastic members 38, such as an O-ring pressed against, can be illustrated.

  The pump device 1 is configured as a known trochoid pump, and the rotor 6 includes an inner rotor 39 and an outer rotor 40. As shown in FIG. 2, the inner rotor 39 has external teeth 39a, and the outer rotor 40 has internal teeth 40a that mesh with the external teeth 39a. The tooth forms of the outer teeth 39a and the inner teeth 40a have different trochoidal curves. By the cooperative action of the inner rotor 39 and the outer rotor 40, the working oil is sucked into the rotor chamber 5 and the working oil is discharged from the rotor chamber 5.

  Referring to FIG. 1 again, the pump device 1 is interposed between the drive shaft 7 and the rotor 6, and transmits the first rotation of the drive shaft 7 only in the first rotation direction X 1 to the rotor 6. A directional clutch 41 and a second one-way clutch 42 which is interposed between the drive shaft 7 and the port block 4 and transmits only the rotation of the drive shaft 7 in the second rotational direction X2 to the port block 4. Yes. As each one-way clutch 41, 42, a known sprag type one-way clutch can be used.

  Specifically, the first one-way clutch 41 is interposed between the outer periphery of the drive shaft 7 and the inner periphery of the inner rotor 39. The pump device 1 also includes a speed reduction mechanism 43 for reducing the rotation of the drive shaft 7 and transmitting it to the port block 4, and the second one-way clutch 42 is between the drive shaft 7 and the speed reduction mechanism 43. Is intervening. The rotation of the drive shaft 7 in the second rotational direction X2 is decelerated via the second one-way clutch 42 and the speed reduction mechanism 43 and transmitted to the port block 4.

  As the speed reduction mechanism 43, for example, a mysterious planetary mechanism as shown in FIGS. 6 and 7 can be used. Specifically, the speed reduction mechanism 43 includes a planetary gear 44 having a rotation center C2 at a position eccentric to the rotation center C1 of the drive shaft 7 and revolving around the rotation center C1 of the drive shaft 7. A first internal gear 45 and a second internal gear 46 disposed concentrically with the rotation center C 1 of the drive shaft 7, and a carrier 47 that supports the planetary gear 44.

  With reference to FIGS. 1 and 6, the carrier 47 extends from the end surface of the cylindrical carrier body 48 surrounding the front half of the drive shaft 7 and the carrier body 48, and is parallel to the rotation center C <b> 1 of the drive shaft 7. And a support shaft 49 extending in the direction. In the axial direction of the drive shaft 7, a second one-way clutch 42 and a bearing 50 made of a sliding bearing such as a sliding bearing such as a metal bush or a needle roller bearing are arranged side by side. Each of the direction clutch 42 and the bearing 50 is interposed between the inner periphery of the carrier body 48 and the outer periphery of the drive shaft 7.

  The planetary gear 44 is rotatably supported by a support shaft 49 of a carrier 47 via a bearing 51 including a plain bearing such as a metal bush or a rolling bearing such as a needle roller bearing. The first internal gear 45 is composed of at least a part of a cylindrical projection 60 integrally formed of a single material with the port block 4, and an internal tooth 45 a is formed on the inner periphery of the first internal gear 45. Is formed.

The second internal gear 46 extends radially outward from one end of the second internal gear main body 52 inserted into the insertion hole 18 of the casing 3 and the second internal gear main body 52. An internal tooth 46 a is formed on the inner periphery of the second internal gear main body 52.
The annular flange 53 is fixed together with the end member 17 to the second end surface 15 b of the casing body 15 by fastening with a fixing screw 54. Therefore, the second internal gear 46 functions as a fixed gear.

The number of teeth of the first internal gear 45 (number of internal teeth 45a) and the number of teeth of the second internal gear 46 (number of internal teeth 46a) are different from each other. For example, the number of teeth of the first internal gear 45 is 31 and the number of teeth of the second internal gear 46 is 30.
When the drive shaft 7 is rotated in the second rotational direction X2, the rotation is transmitted to the carrier 47 via the second one-way clutch 42. The support shaft 49 of the carrier 47 rotates around the rotation center C2. Thereby, the planetary gear 44 rotatably supported by the support shaft 49 revolves while rotating while meshing with the second internal gear 46 as a fixed gear. That is, as shown in FIG. The rotation center C2 rotates along the revolution track C21 centering on the rotation center C1. Along with this, the first internal gear 45 meshed with the planetary gear 44 rotates at a reduced speed in accordance with the difference in the number of teeth between the first and second internal gears 45 and 46.

Referring to FIG. 1 again, the pump apparatus 1 includes a ratchet mechanism 55 as a lock mechanism that can lock the position of the port block 4. The ratchet mechanism 55 as a lock mechanism allows only the rotation of the port block 4 by the rotation transmission from the second one-way clutch 42.
Specifically, the ratchet mechanism 55 is a ratchet pin that is held in a ratchet wheel portion 56 formed on the outer periphery of the port block 4 and an accommodation hole 57 in the casing body 15 so as to be able to advance and retract and can be locked to the ratchet wheel portion 56. 58 and an urging member 59 made of, for example, a compression coil spring, which elastically urges the ratchet pin 58 toward the ratchet wheel portion 56.

According to the present embodiment, by rotating the drive shaft 7 in the first rotation direction X1, the rotor 6 can be rotationally driven to perform a normal pump function.
Further, the electric motor 8 is driven and controlled based on a signal from a rotational position sensor (not shown) that detects the rotational position of the port block 4, and the drive shaft 7 is rotationally displaced by a predetermined amount in the second rotational direction X2, so that the port The block 4 is rotationally displaced. Thereby, the suction hole 29 and the discharge hole 30 of the port block 4 are respectively connected to the first suction hole 31 and the first discharge hole 32 of the casing 3, and the suction hole 29 and the discharge of the port block 4 are discharged. A valve function for switching the hole 30 to the second state communicating with the second suction hole 33 and the second discharge hole 34 of the casing 3 can be achieved.

  Therefore, the valve function can be achieved only by changing the rotation direction of the drive shaft 7 (corresponding to the rotation shaft of the electric motor 8) for driving the rotor 6. That is, it is not necessary to separately provide a driving member for driving the valve function, and the structure can be simplified. Moreover, since the valve function is built in the pump apparatus 1, piping to the conventional external valve becomes unnecessary.

  Further, the valve function described above corresponds to the suction hole 29 of the second end surface 4 b as the surface of the port block 4 and the ports 29 b and 30 b of the discharge hole 30 corresponding to the casing 3 in accordance with the rotational position of the port block 4. This is easily achieved by connecting to a pair of suction ports and discharge ports (corresponding to a pair of the first suction port 31a and the first discharge port 32a or a pair of the second suction port 33a and the second discharge port 34a). .

Further, since the speed reduction mechanism 43 that reduces the speed of the rotation of the second one-way clutch 42 and transmits it to the port block 4 is used, the port block 4 can be reliably rotated by the torque of the drive shaft 7. That is, even with the small electric motor 8, the port block 4 can be reliably rotated.
In particular, since the thrust bearing 26 is interposed between the port block 4 and the end surface 9a of the motor housing 9, the rotational resistance of the port block 4 is small. 4 can be reliably rotated.

Note that the speed reduction mechanism 43 may be eliminated, and the rotation of the drive shaft 7 in the second rotational direction X2 may be transmitted to the port block 4 only through the second one-way clutch 42.
Further, as the lock mechanism that can lock the position of the port block, the ratchet mechanism 55 that allows only the rotation of the port block 4 by the rotation transmission from the second one-way clutch 42 is provided. The position of the port block 4 can be reliably locked. Therefore, when the drive shaft 7 is rotationally driven by the electric motor 8 in the first rotational direction X1 and the pump device 1 performs a normal pump function, the port block 4 does not rotate and the operation is stabilized. .

Further, the ratchet mechanism 55 as a lock mechanism can be easily realized by a simple structure using the ratchet wheel portion 56 formed on the outer periphery of the port block 4 and the ratchet pin 58 urged by the urging member 59. be able to.
The present invention is not limited to the above embodiment, and for example, three or more pairs of suction holes and discharge holes may be provided in the casing 3.

  Moreover, although the surface where each port 29b, 30b of the suction hole 29 of the port block 4 and the discharge hole 30 opens was made into the 2nd end surface 4b of the port block 4, it is not restricted to this, On the outer peripheral surface of the port block 4 You may make it open. In that case, each suction port and each discharge port of the casing 3 are formed on the inner peripheral surface of the cavity 2 of the casing 3 facing the outer peripheral surface of the port block.

  Moreover, you may apply this invention to a vane pump. In addition, various modifications can be made within the scope of the claims of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Pump apparatus, 2 ... Cavity, 3 ... Casing, 4 ... Port block, 4b ... 2nd end surface (surface), 5 ... Rotor chamber, 6 ... Rotor, 7 ... Drive shaft, 8 ... Electric motor, 9 ... Motor Housing 15, casing body 17, end member 24, port block body, 25 end plate, 26 thrust bearing, 29 suction hole, 29 a suction port, 29 b port, 30 discharge port, 30 a discharge Port 31, first suction hole, 31 a, first suction port, 32, second discharge hole, 32 a, second discharge port, 33, second suction port, 33 a, second suction port, 34, second discharge hole 34a ... second discharge port, 35 ... opposite surface, 39 ... inner rotor, 40 ... outer rotor, 41 ... first one-way clutch, 42 ... second one-way clutch, 43 ... deceleration mechanism, 44 ... planet 45, first internal gear, 46 ... second internal gear, 47 ... carrier, 48 ... carrier body, 49 ... support shaft, 55 ... ratchet mechanism (lock mechanism), 56 ... ratchet wheel portion, 57 ... accommodating hole, 58 ... ratchet pin, 59 ... biasing member, X1 ... first rotation direction, X2 ... second rotation direction

Claims (5)

A port block rotatably accommodated in a cavity of the casing;
A rotor housed in a rotor chamber formed in the port block;
A first one-way clutch that is interposed between a drive shaft rotatable in opposite first and second rotational directions and the rotor and transmits only rotation in the first rotational direction;
A second one-way clutch interposed between the drive shaft and the port block and transmitting only the rotation in the second rotational direction,
Each of the port blocks includes a suction hole and a discharge hole communicating with the rotor chamber,
The casing includes a plurality of pairs of suction holes and discharge holes,
As the drive shaft is rotated in the first rotational direction, the rotor is rotationally driven via the first one-way clutch,
As the drive shaft is rotated in the second rotational direction, the port block is rotationally displaced via the second one-way clutch, and as a result, the suction hole and the discharge hole of the port block are A pump device that is switched so as to communicate with any one of the suction holes and the discharge holes of the casing. In Claim 1, the said suction hole and the said discharge hole of the said port block include the port opened to the surface of the said port block,
The plurality of pairs of the suction holes and the discharge holes of the casing include a port facing the surface of the port block,
The suction port of the port block and the port of the discharge hole can be connected to the corresponding pair of the suction hole and the port of the discharge hole, respectively, according to the rotational position of the port block. Pump device.   3. The pump apparatus according to claim 1, further comprising a speed reducer that decelerates and transmits the rotation of the second one-way clutch to the port block. In any one of Claims 1-3, The lock mechanism which can lock the position of the said port block is provided,
The pump device includes a ratchet mechanism in which the lock mechanism only allows rotation of the port block by transmission of rotation from the second one-way clutch.   The ratchet mechanism according to claim 4, wherein the ratchet mechanism includes a ratchet wheel portion formed on an outer periphery of the port block, a ratchet pin that is held by the casing so as to be able to advance and retreat, and can be locked to the ratchet wheel portion, and the ratchet pin And a biasing member that biases elastically toward the ratchet wheel portion.

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