JP2833953B2 - Hydraulic motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic motor provided with a displacement mechanism having internal and external teeth members.

[0002]

2. Description of the Related Art Conventionally, this type of motor is well known, but there is a typical one as shown in FIGS. 6 to 12, and this hydraulic motor is widely used as a traveling motor of a mini excavator. The main part is, for example,
No. 874 is disclosed. Therefore, this known example will be briefly described. The hydraulic motor 1 includes a stationary casing 2, a rotating casing 6 rotatably mounted on the stationary casing 2, a rotating valve member 18 rotatably supported inside the stationary casing 2 together with the rotating casing 6. And a stationary valve member 4 having one side surface in sliding contact with one side surface of the rotary valve member 18 and a displacement mechanism 3 attached to the other side surface. The stationary casing 2, the stationary valve member 4, and the displacement mechanism 3 And a fluid inflow passage and a fluid outflow passage communicating with each other, and a plurality of rotation passages 63 and 67 alternately communicating with the fluid inflow passage and the fluid outflow passage as shown in FIGS. As shown in FIGS. 9 and 10, the stationary valve member 4 has a rotary passage through a recess 64, 66.
There are provided seven stationary passages 48 alternately communicating with 63 and 67, and the displacement mechanism 3 is disposed eccentrically in the internal tooth member 7 and the external teeth one less than the internal teeth. And has an external tooth member 8 that meshes with and rotates and revolves, and forms a volume change chamber 9 that expands and contracts due to the relative movement and rotational movement between the two tooth members 7, 8. A transmission shaft 13 for transmitting the rotation of the external tooth member 8 to the rotary casing 6 via the output shaft 11 is provided. The output shaft 11 has an internal spline 12, and an external spline 14 formed at one end of the transmission shaft 13 meshes with the spline 12. Another external spline 16 is provided at the other end of the transmission shaft 13 and meshes with an internal spline 17 formed in an inner hole of the external tooth member 8. Assuming that the number of the internal teeth of the internal tooth member 7 is seven, the external tooth member 8 orbits seven times to perform a complete one-time rotation. As a result, the transmission shaft 13 and the rotary casing 6 are completely rotated.
A rotational movement is obtained, and a counterbalance valve 21 is mounted on the side surface of the displacement mechanism 3 via the spacer plate 5.

In the rotary valve member 18 shown in FIGS. 7 and 8, FIG. 7 shows a surface 56 on the balancing ring 60 side, and FIG. 8 shows a surface 57 on the stationary valve member 4 side. 58 is the central hole, 59
Are two arc-shaped concave portions formed concentrically with the center hole 58 on the surface 56, and a projection 61 provided in the middle thereof has an output shaft
The notch 62 (FIG. 6) provided at the opposite end of the connector 11 is fitted to connect the two.
Is formed by horizontal holes communicating the two surfaces 56 and 57 on the outside of the rotary passage 63, 64 are formed around the rotary passage 63 and between them at six circumferentially equally spaced concave portions, and 66 is a concave portion.
In the recess formed in the middle of 64, the rotation passage 67 is constituted by an inclined hole and communicates with the stepped outer peripheral surface 68, and the outermost peripheral surface
A notch 71 is formed in 69 at right angles to the rotation passage 63. 9 and 10 show the surface 46 on the rotary valve member 18 side and FIG. 10 shows the surface on the displacement mechanism 3 side in the stationary valve member 4 shown in FIGS.
47 are shown respectively. 45 is a central hole, 49 is a concave portion of the same shape formed in the middle of a stationary passage 48 on the surface 46, and 50 is a central hole 45.
An annular groove 51 concentric with the surface 47, a concave portion formed around the stationary passage 48 on the surface 47, 52 and 53 arc-shaped grooves 55 on the surface 46 and inclined holes communicating between the annular groove 50 and the surface 47, 54 Indicates a horizontal hole. In the counterbalance valve 21 shown in FIGS. 11 and 12, reference numeral 73 denotes a valve body, 74 denotes a first port, 75 denotes a second port, 76, 77, and 78 denote flow holes, and 79 and 80 denote check valves, respectively.

[0004] In the above-described operation, during operation, high-pressure oil flows in from the first port 74 of the counterbalance valve 21 and passes through the flow passage inside the valve body 73 to the through hole of the spacer plate 5 through the flow hole 76. Then, the high-pressure oil flows through the central hole of the zellora constituting the internal teeth of the internal toothed casing 7 of the displacement mechanism 3, and flows into the annular groove 50 through the inclined hole 52 of the stationary valve member 4 (FIGS. 9 and 10). The high-pressure oil is then supplied to the rotary valve member 18
After flowing into the recess 64 of FIGS. 7 and 8, it again enters the stationary passage 48 of the stationary valve member 4, enters the volume change chamber 9 of the displacement mechanism 3 from the recess 51, and rotates the external tooth member 8. . Due to the rotation of the external tooth member 8, the rotational torque is transmitted to the output shaft 11 via the transmission shaft 13, and the high torque is output by the rotary casing 6. During this time, the output shaft 11 and the rotary valve member
Since the rotary valve member 18 is connected to the stationary valve member 4 in the same manner as in the related art, the valve is switched in this manner because the notch 62 is connected to the projection 61 by the notch 62.

The pressure oil in the rear volume change chamber 9 is discharged as low-pressure return oil, and this return oil is supplied to the recess 51 of the stationary valve member 4.
Through the stationary passage 48, enters the concave portion 66 of the rotary valve member 18, enters the annular pressure chamber 65 (FIG. 6) between the rotary valve member 18 and the stationary casing 2 via the rotary passage 67, and 4
Through the arc-shaped groove 55 and the inclined hole 53, enters the center hole of the zellora of the casing 7 from the inclined hole 53, passes through the through hole of the spacer plate 5, passes through the through hole 77 of the counter balance valve 21, and passes through the second port 75. Spill out of. This is a case where the first port 74 is used as an inlet port, and conversely, the second port 75 is used.
When used as an inlet port, the flow is reversed.

In the meantime, the sealing between the two valve members 4 and 18 is performed by the balancing ring 60, which is performed in the same manner as the conventional one (not shown), so that the operation will be described only briefly. When the high-pressure oil enters the concave portion 66 of the rotary valve member 18, the rotary valve member 18 tends to move away from the stationary valve member 4, but the high-pressure oil in the annular pressure chamber 65 in FIG. To the pressure chamber 87, which presses the rotary valve member 18 against the stationary valve member 4 so that the pressing force is slightly larger than the force that the rotary valve member 18 tends to separate from the stationary valve member 4. Thus, the rotation valve member 18 is prevented from separating from the stationary valve member 4 to prevent leakage. When the high-pressure oil enters the concave portion 64 of the rotary valve member 18, the high-pressure oil is guided to the annular groove 89, the through hole 90, and the pressure chamber 91 of the balancing ring 60 through the rotary passage 63. 18 is pressed against the stationary valve member 4 to prevent leakage.

[0007]

In the above-described hydraulic motor, a balancing ring 60 is provided in the stationary casing 2 in order to prevent pressure oil from leaking in the system. 18
Is prevented from separating from the stationary valve member 4, so that the structure is complicated, high precision processing is required and the manufacturing cost is high, and it is possible to surely prevent pressure oil leakage. There was a problem that it was difficult.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the conventional hydraulic motor, and to eliminate the need for a balancing ring provided in the conventional hydraulic motor, thereby reducing the structure. Therefore, it is an object of the present invention to provide a hydraulic motor which is simple and easy to manufacture so that the manufacturing cost is low and the pressure oil can be surely prevented from leaking.

[0009]

In order to achieve the above object, the present invention provides a stationary casing, a rotating casing rotatably mounted on the stationary casing,
A rotary valve member rotatably supported together with the rotary casing inside the stationary casing, and a stationary valve member having one side surface in sliding contact with one side surface of the rotary valve member and a displacement mechanism attached to the other side surface. A fluid inflow passage and a fluid outflow passage communicating with each other to the stationary casing, the stationary valve member, and the displacement mechanism, and a plurality of rotation passages alternately communicating with the fluid inflow passage and the fluid outflow passage in the rotary valve member. A stationary passage is provided in the stationary valve member at a position facing the rotary passage, and the displacement mechanism has an internal tooth member and an external tooth member which is in the internal tooth member, meshes with the internal tooth member, and rotates and revolves. In the hydraulic motor provided with a transmission shaft for transmitting the rotation of the external tooth member to the rotary casing, an annular flange is provided at a portion of the rotary valve member opposite to the stationary valve member, and the annular flange is provided with a stationary valve member. Anti On the side, annular passage communicating with the fluid inflow passage of the stationary casing is provided, on the surface and the sliding contact surface of the rotary valve member of the stationary casing is characterized in that mounted an annular seal member.

[0010]

In the hydraulic motor of the present invention as described above,
The high-pressure oil that has flowed into the casing through the fluid inflow passage is an internal tooth member of the displacement mechanism, a stationary valve member, a rotary valve member,
After flowing into the displacement chamber on the high pressure side of the displacement mechanism via the stationary valve member, the external tooth member is rotated, and the rotation is transmitted to the rotary casing by the transmission shaft to output a high torque, during which the rotary casing and the rotary valve are rotated. The member rotates integrally and the valve is switched between the stationary valve member and the stationary valve member. In this way, the return oil in the volume change chamber on the low pressure side of the displacement mechanism is supplied to the stationary valve member and the rotary valve. Member, stationary valve member, internal teeth member of displacement mechanism,
Discharged through the fluid outflow passage. During this time, an annular flange is provided at a portion of the rotary valve member facing the stationary valve member, and the high-pressure oil flowing into the annular flow path communicating with the fluid inflow passage of the stationary casing provided on the opposite side of the stationary valve member of the annular flange is provided. Applying high pressure to the back of the annular flange of the rotary valve member to press the rotary valve member against the stationary valve member to prevent high-pressure oil from leaking between the two valve members, and to further reduce the rotational valve member of the stationary casing. The high-pressure oil is prevented from leaking from between the two members by the seal member mounted on the surface that comes into sliding contact with the surface.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention shown in FIGS. 1 to 5, the same components as those of the prior art are denoted by the same reference numerals, and the description thereof will be omitted. The fluid inflow passage 19 has a spacer plate 5 communicating with a high-pressure inlet port 25 provided in the counterbalance valve 21,
The displacement mechanism 3, the stationary valve member 4, and the guide holes 27, 28, 29, and 30 provided in the stationary casing 2 respectively, and the fluid outflow passage 20 communicates with a low-pressure outlet port 26 provided in the counterbalance valve 21. The spacer plate 5, the displacement mechanism 3, the stationary valve member 4, and the guide holes 31, 32, 43, and 44 provided in the stationary casing 2, respectively. Output shaft
The rotary valve member 18 is connected to the rotary valve member 18 by a notch 38 and a projection 39. The rotary valve member 18 is as shown in FIG. A recess 33 is provided around the periphery. In the stationary valve member 4 shown in FIGS.
4 shows the surface 34 on the side of the rotary valve member 18 and FIG. 5 shows the surface 35 on the side of the displacement mechanism 3, respectively. Reference numeral 36 denotes a center hole, and a concave portion 37 for pressure balance, which is hatched in the same shape, is provided in the middle surface 34 of the seven stationary passages 24. An annular flange 40 is provided at a portion of the rotary valve member 18 opposite to the stationary valve member 4, and the opposite side of the annular flange 40 to the stationary valve member 4 communicates with the guide hole 30 of the fluid inflow passage 19 of the stationary casing 2. An annular flow path 41 is provided, and a plurality of seal members 42 are mounted on the surface of the stationary casing 2 that is in sliding contact with the surface of the rotary valve member 18.

In the above-described operation, high-pressure oil flows from the inlet port 25 of the counterbalance valve 21 during operation and passes through the guide holes 27, 28, 29, 30 constituting the fluid inflow passage 19 and the annular flow passage 41. Into the rotation passage 23 of the rotation valve member 18,
Through the stationary passage 24 of the stationary valve member 4, it flows into the volume change chamber 9 in the internal tooth member 7 of the displacement mechanism 3 to rotate the external tooth member 8. Then, by the rotation of the external tooth member 8, the rotational torque is transmitted to the output shaft 11 via the transmission shaft 13, and a high torque is output by the rotary casing 6. During this time, since the output shaft 11 and the rotary valve member 18 are connected, the rotary valve member 18 rotates with respect to the stationary valve member 4 in the same manner as in the prior art, and the valve is switched in this manner. The pressure oil in the rear volume change chamber 9 is discharged as a low-pressure return oil, and this return oil passes through the stationary passage 24 of the stationary valve member 4 and the rotational passage 23 of the rotary valve member 18, The fluid enters the concave portion 33 of the fluid passage 18, and flows out of the outlet port 26 of the counter balance valve 21 through the guide holes 44, 43, 32, 31 constituting the fluid outflow passage 20.

When the high-pressure oil enters the concave portion 33 of the rotary valve member 18 via the fluid inflow passage 19 in the above case, the pressure causes the rotary valve member 18 to separate from the stationary valve member 4. The high-pressure oil flowing into the annular flow passage 41 communicating with the fluid inflow passage 19 provided in the stationary casing 2 is provided on the back surface of the annular flange 40 of the rotary valve member 18 provided at a portion facing the stationary valve member 4. A high pressure is applied to the back surface of the annular flange 40 to press the rotary valve member 18 against the stationary valve member 4 to prevent high-pressure oil from leaking between the two valve members 4 and 18, and to further rotate the stationary casing 2. The high-pressure oil is prevented from leaking from between the two members 2 and 18 by the seal member 42 mounted on the surface that slides on the surface of the valve member 18.

[0014]

According to the present invention, as described above, a stationary casing, a rotary casing, a rotary valve member provided inside the stationary casing, and one side slidingly contacting one side of the rotary valve member, and the other side. A stationary valve member having a displacement mechanism mounted thereon, a stationary casing, a stationary valve member, and a displacement mechanism provided with a fluid outflow / inflow passage communicating with the displacement mechanism, and a rotary valve member communicating with the fluid outflow / inflow passage. The rotation path of
The stationary valve member is provided with a stationary passage at a position facing the rotary passage, and the displacement mechanism is provided with an external tooth member that engages with the internal tooth member to rotate and revolve, and transmits the rotation of the external tooth member to the rotary casing. A rotary shaft is provided, an annular flange is provided at a portion of the rotary valve member facing the stationary valve member, and an annular flow path communicating with the fluid inflow passage is provided at a stationary casing opposite to the stationary valve member of the annular flange. The seal member is attached to the surface of the casing that slides on the surface of the rotary valve member, eliminating the need for a balancing ring provided on conventional hydraulic motors, making the structure simple and easy to manufacture. Therefore, there is an effect that the manufacturing cost is reduced and the leakage of the fluid can be surely prevented.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 in FIG.

FIG. 3 is a view of the rotary valve member shown in FIG.

FIG. 4 is a view of the stationary valve member according to the embodiment taken along line 4-4 in FIG. 1;

FIG. 5 is a view of the stationary valve member according to the fifth embodiment taken along line 5-5 in FIG. 1;

FIG. 6 is a vertical sectional front view of a typical conventional example of this type of hydraulic motor.

FIG. 7 is a side view of the rotary valve member.

FIG. 8 is another side view of the same.

FIG. 9 is a side view of the stationary valve member according to the first embodiment;

FIG. 10 is another side view of the same.

FIG. 11 is a view taken along line 11-11 in FIG. 6;

FIG. 12 is a longitudinal sectional view taken along line 12-12 in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic motor 2 Stationary casing 3 Displacement mechanism 4 Stationary valve member 6 Rotating casing 7 Internal tooth member 8 External tooth member 9 Volume change chamber 11 Output shaft 13 Transmission shaft 18 Rotary valve member 40 Annular flange 41 Annular flow path 42 Seal member

Claims (1)

(57) [Claims] 1. A stationary casing, a rotating casing rotatably mounted on the stationary casing, a rotating valve member rotatably supported together with the rotating casing inside the stationary casing, and a rotary valve having one side surface. A stationary valve member slidably contacting one side surface of the member and having a displacement mechanism mounted on the other side surface; and a fluid inflow passage and a fluid outflow passage communicating with each other with the stationary casing, the stationary valve member, and the displacement mechanism. The rotary valve member is provided with a plurality of rotary passages alternately communicating with the fluid inflow passage and the fluid outflow passage, and the stationary valve member is provided with a stationary passage at a position opposed to the rotary passage. In the internal teeth member and mesh with this,
In a hydraulic motor having an external tooth member that rotates and revolves, and a transmission shaft that transmits the rotation of the external tooth member to the rotary casing, an annular portion is formed in a portion of the rotary valve member facing the stationary valve member. A flange was provided, an annular flow path communicating with the fluid inflow passage of the stationary casing was provided on the opposite side of the stationary valve member of the annular flange, and an annular seal member was mounted on a surface of the stationary casing that slidably contacted the surface of the rotary valve member. A hydraulic motor characterized in that: