JP3051238B2 - 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 As a typical example of this type of the prior art, the applicant of the present application has proposed a Japanese Patent Application No. 2-8489 as shown in FIG. It will be described briefly. This hydraulic motor has a shaft support casing 102, a displacement mechanism 103, a stationary valve member 104, a spacer plate 105, an output shaft 111, and a rotary valve member 123. Then, the displacement mechanism 103 causes the internal tooth member 107 to
An external tooth member 108 having a small number of teeth is eccentrically disposed, and the volume change chamber 109 expands and contracts due to the relative movement and the rotational movement between the internal tooth member 107 and the external tooth member 108.
The counterbalance valve 129 is attached to the side surface of the displacement mechanism 103 via the spacer plate 105.

An output shaft 111 rotatably supported in the shaft support casing 102 is provided. The output shaft 111 has an internal spline 112 and an external spline 114 formed at one end of a transmission shaft 113. It is in mesh with the internal spline 112. Another external spline 116 is provided at the other end of the transmission shaft 113,
It meshes with an internal tooth spline 117 formed in the internal hole of the external tooth member 108. Assuming that the number of the internal teeth of the internal tooth member 107 is seven and the number of the external teeth of the external tooth member 108 is six, the external tooth member 107 revolves six times so that the external tooth member 107 rotates once, As a result, one complete rotation of the transmission shaft 113 and the output shaft 111 is obtained.

In the stationary valve member 104 shown in FIGS.
6 shows a surface 146 on the side of the rotary valve member 123, and FIG. 7 shows a surface 147 on the side of the displacement mechanism 103. 145 is a center hole, 148 is seven openings, 149 is a recess of the same shape formed in the surface 146 in the middle of the opening 148, 150 is an annular groove concentric with the center hole 145,
Reference numeral 151 denotes a concave portion formed around the opening 148 on the surface 147, 152 and 153 represent inclined holes communicating between the arc-shaped groove 155 and the annular groove 150 of the surface 146 and the surface 147, and 154 represents a horizontal hole, respectively. .

In the rotary valve member 123 shown in FIGS.
FIG. 8 shows the surface 156 on the balancing ring 143 side, and FIG.
Indicates a surface 157 on the stationary valve member 104 side. 158 is a center hole, 159 is two arc-shaped recesses formed concentrically with the center hole 158 on the surface 156, and a projection provided in the middle
161 is fitted in a notch provided at the opposite end of the output shaft 111 to connect the two, and 163 is a horizontal hole communicating with both surfaces 156 and 157 outside the projection 161; Are six recesses formed around the horizontal hole 163 and in the middle thereof at equal intervals in the circumferential direction, 166 is a recess formed in the middle of the recess 164, and is formed with the stepped outer peripheral surface 168 by the inclined hole 167. The outermost peripheral surface 169 is formed with a notch 171 in a direction perpendicular to the communication hole 163.

In the counterbalance valve 129 shown in FIGS. 10 and 11, 173 is a valve body, 174 is a high-pressure inlet port, 175 is a low-pressure outlet port, 176, 177, 178 are flow holes, 179, 180
Indicates a check valve.

In the above-described operation, high pressure oil flows from the inlet port 174 of the counterbalance valve 129 and flows through the flow passage inside the valve body 173 through the flow hole 176 through the through hole of the spacer plate 105 during operation. Flows through the central hole of the internal teeth of the internal teeth member 107 of the displacement mechanism 103, and this high-pressure oil
It flows into the annular groove 150 through the inclined hole 152 of 04. After this high-pressure oil flows into the concave portion 164 of the rotary valve member 123, it again enters the selected port 148 of the stationary valve member 104, enters the volume change chamber 109 of the displacement mechanism 103 from the concave portion 151, and enters the external tooth member 108 To rotate. By the rotation of the external tooth member 108, the rotation torque is transmitted to the output shaft 111 via the transmission shaft 113. Since the output shaft 111 and the rotary valve member 123 are connected to each other, the rotary valve member 123 rotates relative to the stationary valve member 104 in the same manner as in the related art, and the valves are switched in this manner.

The pressurized oil in the rear volume change chamber 109 is discharged as low-pressure return oil, and the returned oil passes through the recess 151 of the stationary valve member 104, passes through the guide port 148, and passes through the recess of the rotary valve member 123. 166
Into the annular pressure chamber 144 between the rotary valve member 123 and the shaft support casing 102 via the inclined hole 167, and the stationary valve member 10
4 through the arc-shaped groove 155 and the inclined hole 153, enters the center hole of the internal tooth member 107 from the inclined hole 153, passes through the through hole of the spacer plate 105, passes through the communication hole 177 of the counterbalance valve 129, and exit port 175. Spill out of. This is the case when the port 174 is used as an inlet port, and conversely, when the port 175 is used as an inlet port, the flow is reversed.

The operation of this type of fluid motor is generally known to those skilled in the art, and FIG. 12 shows the displacement mechanism 103 (upper) and the displacement mechanism 103 when the operation of the hydraulic motor is started, that is, when the external tooth member 108 is at the zero position. This figure shows the positional relationship between the valve members 104 and 123 (lower part). In the volume chamber 109 and the flow paths of the valve members 104 and 123, the hatched portions indicate the high pressure side communicating with the inlet port 174, and the other portions indicate the outlet port. The low pressure side communicating with 175 is shown. FIG. 13 shows the case where the external tooth member 108 has turned 1/14 next, and FIG. 14 shows the case where the external tooth member 108 has turned 1/7. In this way, when the external tooth member 108 has revolved six times in the internal tooth member 107, it rotates once, and as a result, one complete rotation of the transmission shaft 113 and the output shaft 111 is obtained.

[0010]

Recently, there has been an increasing demand for downsizing the hydraulic motor as described above. However, in the above-mentioned hydraulic motor, the number of parts is large, and it is still possible to sufficiently satisfy this desire. There is a problem that miniaturization as small as possible cannot be achieved. Such a problem is caused by the output shaft 111
(The reference numerals are those of conventional examples described in FIGS. 5 to 14) are rotatably fitted to the stationary shaft support casing 102, and a displacement mechanism 103 is fixed to the shaft support casing 102. An external tooth member 108 and an internal tooth member 107 that mesh with each other are provided, and by supplying pressure oil into the displacement mechanism 103,
When the external tooth member 108 revolves within the internal tooth member 107 by the number of teeth, it rotates once, and this rotation is transmitted to the output shaft 111 by the transmission shaft 113, and the rotation of the output shaft 111 is transmitted to another belt or the like. It was confirmed that this was for transmission to the operating member.

Therefore, the present invention solves the above-mentioned problems of the conventional hydraulic motor, and provides a hydraulic motor capable of meeting the above-mentioned requirements by reducing the number of parts and achieving downsizing. In order to do so, the ingenuity is repeated and the common sense is changed, and the displacement mechanism is not provided in the stationary shaft support casing, but in the rotating output shaft. It could be conceived that such an object could be achieved if provided.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an input means having a casing provided with an inlet port and an outlet port, and a rotatable concentric and rotatable input means. Output means attached, the output means is provided with an internal gear member and a rotary valve member,
An external tooth member meshing with the internal tooth member is provided in the internal tooth member, and a stationary valve member connected to a casing constituting a valve mechanism for switching the flow of fluid in cooperation with the rotary valve member is provided in the casing. A connecting shaft that is connected to the casing so as to revolve the external tooth member but not to rotate, and to rotate the output means via the internal tooth member by the revolution of the external tooth member. Things.

[0013]

In the hydraulic motor of the present invention as described above,
The high-pressure oil flowing from the inlet port of the casing of the input means flows through the stationary valve member and the rotary valve member into the displacement chamber on the high-pressure side of the displacement mechanism, revolves around the external tooth member, and engages with the internal tooth member. And the output means provided with the internal teeth member rotates with high torque, and this rotational force is used. In addition, this rotation rotates the rotary valve member integrally with the internal gear member, and switches the valve between the stationary valve member and the stationary valve member. On the other hand, the return oil in the volume change chamber on the low pressure side of the displacement mechanism is discharged from the outlet port of the casing via the rotary valve member and the stationary valve member.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention shown in FIGS. 1, 2, 3, and 4, description of the same parts as those of the conventional hydraulic motor will be omitted, and different points will be mainly described. 1 is a casing 4 provided with an inlet port 2 and an outlet port 3
An output means 5 is mounted concentrically and rotatably on the input means 1, and the output means 5 is provided with an internal tooth member 6 and a rotary valve member 7. An external tooth member 8 that meshes with the member 6 is provided in the member 6,
A stationary valve member 9 connected to the casing 4 constituting the valve mechanism 11 is provided in the casing 4 in order to switch the flow of the fluid in cooperation with the rotary valve member 7, and the external tooth member 8 revolves. A connection shaft 12 connected to the casing 4 so as not to rotate is provided.

A displacement mechanism 10 is constituted by the two tooth members 6 and 8, and an end cap 14 is provided on the outside (left side in FIG. 1).
On the opposite side, the rotary valve member 7 and the case 15 are arranged, and these are integrally connected by bolts 16 to constitute the output means 5. An external tooth member 8 having one less tooth is eccentrically disposed in the internal tooth member 6, and a volume change chamber 13 is formed between the two tooth members 6, 8. An internal spline 18 is provided on the inner periphery of the external tooth member 8, and an external spline 19 formed at one end of the connection shaft 12 is meshed with the internal spline 18, and an external spline 20 formed at the other end is connected to a casing. 4 meshes with the internal spline 21 formed in the inner hole. A balancing ring is provided between the stationary valve member 9 and the casing 4 as in the prior art.
The balancing ring 23 is provided with a small hole 22 in the axial direction, and at the axial end of the casing 4 is provided a counterbalance valve 29 similar to the conventional one.

In the above-described hydraulic motor, the valve mechanism
11 and the counter balance valve 29 etc. are basically the same as the conventional one, and the high-pressure oil sent from the inlet port 2 is sent to the first passage 24 via the counter balance valve 29,
Through the small hole 22 of the balancing ring 23, the stationary valve member 9 of the valve mechanism 11, and the rotary valve member 7, they are sequentially introduced into the volume change chamber 13 of the displacement mechanism 10, and are attached to the casing 4 by the pressure so that they cannot rotate. When the external tooth member 8 revolves in the internal tooth member 6 and the number of times becomes six, the internal tooth member 6 rotates once, and at this time, the rotary valve member 7 also rotates and moves between the internal valve member 7 and the stationary valve member 9. The return of the oil in the volume change chamber 13 on the low pressure side of the displacement mechanism 10 is performed by the valve mechanism 11 and the second passage 25 as shown by a dotted arrow.
Through the outlet port 3.

FIG. 2 shows the positional relationship between the displacement mechanism 10 (upper) and the valve mechanism 11 (lower) when the operation of the hydraulic motor is started, that is, when the internal gear member 6 is at the zero position, in the above case. In the flow paths of 13 and the valve members 7 and 9, the hatched portions indicate the high-pressure side communicating with the inlet port 2, and the other portions indicate the low-pressure side communicating with the outlet port 3. FIG. 3 shows that the internal tooth member 6 is 1 /
In the case of 14 rotations, FIG.
The case of seven rotations is shown. Thus, the internal tooth member 6 rotates once when the external tooth member 8 revolves six times in the internal tooth member 6, and as a result, the output means 5 rotates once in the direction of the arrow.

[0018]

According to the present invention, there is provided an input means having a casing provided with an inlet port and an outlet port, and an output means having an internal gear member concentrically and rotatably mounted on the input means. Along with changing the common sense so far, an internal gear member and a rotary valve member are provided in the output means, and an external gear member meshing with the internal gear member is provided in the internal gear member,
A stationary valve member connected to a casing constituting a valve mechanism is provided in the casing in order to switch the flow of fluid in cooperation with the rotary valve member, and further, the external teeth member is revolved but connected to the casing so as not to rotate. Since the connecting shaft is provided, and the internal gear member and the rotary valve member serve as the output means as they are, the conventional hydraulic motor is separate from the above members and the output means, so that the number of parts is reduced and the size is reduced. As compared with the case where the operation cannot be performed, the number of parts can be reduced and the size can be reduced, so that there is an effect that a large space is not required for the installation.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram of a positional relationship between a displacement mechanism and a valve mechanism at the start of the operation of the above.

FIG. 3 is an explanatory diagram of a positional relationship between a displacement mechanism and a valve mechanism after the start of the above operation.

FIG. 4 is an explanatory diagram of a positional relationship between a displacement mechanism and a valve mechanism, which are further behind the above.

FIG. 5 is a vertical sectional front view of a conventional hydraulic motor.

FIG. 6 is a side view of the stationary valve member according to the first embodiment;

FIG. 7 is another side view of the same.

FIG. 8 is a side view of the rotary valve member.

FIG. 9 is another side view of the same.

FIG. 10 is a cutaway view taken along line 10-10 of FIG. 5;

FIG. 11 is a cutaway view taken along line 11-11 of FIG. 5;

FIG. 12 is an explanatory diagram of a positional relationship between a displacement mechanism and a valve mechanism at the start of the operation of the above.

FIG. 13 is an explanatory diagram of a positional relationship between the displacement mechanism and the valve mechanism after the start of the operation of the above.

FIG. 14 is an explanatory diagram of a positional relationship between a displacement mechanism and a valve mechanism, which are further behind the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input means 2 Inlet port 3 Outlet port 4 Casing 5 Output means 6 Internal tooth member 7 Rotating valve member 8 External tooth member 9 Static valve member 10 Displacement mechanism 11 Valve mechanism 12 Connecting shaft 13 Volume change chamber 14 End cap 15 Case

Claims (1)

(57) [Claims] An input means having a casing provided with an inlet port and an outlet port, and output means concentrically and rotatably mounted on the input means, wherein the output means has an internal tooth member and A rotary valve member is provided, an external tooth member meshing with the internal valve member is provided in the internal tooth member, and a casing constituting a valve mechanism for switching the flow of fluid in cooperation with the rotary valve member in the casing. A stationary valve member is provided, and a connecting shaft is provided for connecting the casing to the external tooth member so as to revolve but not rotate.
A hydraulic motor, wherein an output means is rotated via an internal tooth member by a revolution of an external tooth member.