JPH05149236A - Oil hydraulic motor device - Google Patents

Abstract

PURPOSE:To provide a device of simple structure wherein a motor system is prevented from receiving a bad influence by a high load applied to an output shaft further with compactness relatively obtainable. CONSTITUTION:A device provides a housing 12 having inlet and delivery ports of operating fluid, external gears 13, 14 built in the housing 12 and rotated by the supplied operating fluid while meshed with each other and an output shaft 20 rotated to be associated with these gears. In this oil hydraulic motor device, an output gear 15, which is separately rotatably supported by integrally connecting with the output shaft 20 and rotates while meshing with one of the external gears 13, 14, is provided in the housing 12 and also providing an oil relief path 21, connected to an oil flow path 16, related to the output gear 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic motor device using an external gear.

[0002]

2. Description of the Related Art Among hydraulic motor devices, the external gear type is used in various industrial equipment because of its simple structure. Figure 3
Shows a conventional example. In this hydraulic motor device 1, external gears 3 and 4 are meshed with each other in a housing 2 to form a gear 3
An output shaft 6 extended from the gear shaft 5 is disposed outside the housing 2. The housing 2 has an inlet and a discharge port which are provided on the front or rear wall of the same drawing and communicate with the internal oil flow passage 9, and the tooth tips of the gears 3 and 4 which are axially supported by the bearing holes of the side plates 7 and 8. It is wrapped in the inner wall of the housing. Oil passage 9 from the inlet
When pressurized hydraulic oil is supplied to the gears, the hydraulic oil is
Is filled in the tooth space of the housing and is sent to the discharge port along the inner surface of the housing 2. At this time, the gears 3 and 4 are rotated by the pressure of the hydraulic oil, and this rotation causes the output shaft 6 to rotate. Output shaft 6
Drives gears, pulleys, sprockets, fans, etc. connected here.

[0003]

By the way, when the output shaft 6 is provided integrally with the gear shaft of the gear 3 as described above, and the gear or fan is directly attached to the output shaft 6, the output of the output shaft 6 is caused by the operation of the gear or fan. As a result of the load in the axial direction or the direction perpendicular thereto or the load due to vibration being transmitted to the gear 3 through the output shaft 6 as it is, the performance and life of the motor system are likely to be adversely affected. As a countermeasure against this, it is conceivable to provide an appropriate buffer joint means between the output shaft 6 and the gear shaft 5 of the gear 3. Specifically, for example, it is a joint method in which a spline is formed on the outer periphery of the shaft portion of the gear shaft 5, an engaging portion is provided on the output shaft 6, and the engaging portion is fitted to the spline with play. According to this joint structure, an unbalanced load applied to the output shaft 6 in the axial direction or in the right angle direction is buffered by the spline fitting portion, and the adverse effect of the unbalanced load can be prevented to some extent. However, if such a buffer joint means is adopted, the output shaft must be separately supported on the housing side, and the strength of the joint portion must also be provided to that extent, so the device becomes large and the load load Is also limited to.

Therefore, the present invention solves the above problems and provides a hydraulic motor device having a simple structure in which the motor system is not adversely affected by a high load applied to the output shaft and can be made relatively compact. The purpose is to

[0005]

To achieve the above object, the present invention is directed to a housing having an inlet communicating with an internal oil passage and a discharge opening, and a housing incorporated in the housing and meshed with each other and supplied from the inlet. In a hydraulic motor device including an external gear rotated by hydraulic oil and an output shaft rotated in conjunction with the gear, the output shaft is integrally coupled in the housing, and one of the external gears is connected. The gist of the present invention is that it has an independently supported output gear that meshes with and rotates, and that an oil relief passage communicating with the oil passage is provided in relation to the output gear.

[0006]

According to the above-described device, the output gear dedicated to the output is built in separately from the externally meshing gears that mesh with each other, and the oil relief passage communicating with the oil flow passage is provided. Therefore, the working oils mesh with each other. It is sent to the discharge port through the external gear and the oil escape passage, and at the same time, the output gear rotates in conjunction with the external gear. The unbalanced load applied to the output shaft is exclusively received by the output gear system, and the transmission to the external gear side is blocked, so that the motor system is not affected. Here, as the oil escape path, for example, the tooth width of the output gear is made smaller than the tooth width of the external gear meshing with the output gear to make a gap between the side plate, the tooth tip of the output gear and the inner surface of the housing. Can be formed by providing a gap between the housing and the housing, or by additionally forming a groove-shaped flow path in the housing. The point is that it may be provided in relation to the output gear and communicate with the oil flow path in the housing.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a longitudinal sectional view showing a hydraulic motor device to which the present invention is applied, and FIG. 2 is a sectional view taken along the line AA of FIG. A detailed structure such as an oil leakage recovery passageway is omitted in the figure, and a main part of the apparatus will be described. The hydraulic motor device 10 of FIG. 1 includes a housing 12 closed by a side lid 11,
The housing 12 includes external gears 13 and 14 that are provided in the housing 12 and mesh with each other, and an output gear 15 that meshes with the gear 13 and rotates. The housing 12 and the side lid 11 are made of aluminum alloy. The housing 12 has inlets and outlets (not shown) located on the left and right sides in FIG. 1 which communicate with the internal oil flow path 16, and a side plate 17 is provided in a space provided corresponding to each gear 13, 14, 15. 1 through gears 18,
After incorporating 3, 14 and the output gear 15, the side lid 11
Are sealed and attached by a bolt or the like through a ring-shaped seal member 19a to be integrated. The side plates 17 and 18 are made of bronze, have bearing holes, and are arranged with a seal member 19b and the like interposed. The side plate structure may be integrally formed with the housing side, or conversely, a pressure balance mechanism or the like may be adopted. The gears 13 and 14 are press-fitted with steel gear shafts 13a and 14a, and the output gear 15 is the output shaft 2
It is made of a ferrous sintered alloy in which 0 is press-fitted. Gears 13, 14
Are rotatably supported by the bearing holes of the side plates 17 and 18 and mesh with each other on the inlet line. Both end surfaces of the gears 13 and 14 are in sliding contact with the side plates 17 and 18, and the tooth tips are in sliding contact with the inner surface of the space. ing. The output gear 15 has substantially the same shape as the gears 13 and 14, but has an oil escape passage 21 as shown in FIG. The oil escape passage 21 is formed by a notch 22 formed on one side in the tooth width direction so as to be lowered. Output gear 1
5 is assembled by fitting the side plates 17, 1 so as to mesh with the gear 13.
Through hole 23, which is inserted into the bearing hole of No. 8 and is axially supported on both sides of the gear, and the extended portion of the output shaft 20 is provided in the side lid 11.
And, it is projected to the outside through the seal member 24 mounted outside the through hole. Output gear 1 when assembled
Both end surfaces of 5 are in sliding contact with the side plates 17 and 18, and the tooth tips are in sliding contact with the inner surface of the space portion. However, the existence of the oil escape passage 20 allows the oil passage 16 and the discharge port to communicate with each other. There is.

The operational effects of the hydraulic motor device 10 having the above structure will be described below. By the attached hydraulic pump,
The hydraulic oil is supplied to the left oil passage 16 of FIG. 1 through the inlet at a predetermined pressure. Then, the gears 13 and 14 rotate in the direction of the arrow, and the output gear 15 rotates in conjunction with the rotation.
The hydraulic oil is indicated by the dots in the figure, and the gears 13, 1
No. 4 is filled in each tooth groove and continuously transferred along the inner surface of the space of the housing 12, moved to the right oil passage 16 in the figure, and discharged from the discharge port to the outside of the housing 12. At this time, the oil escape passage 21 eliminates binding of the working oil in the meshing portion between the gear 13 and the output gear 15, and allows the working oil to freely move from the oil passage 16 to the discharge port. The output shaft 20 drives a gear, a pulley, a sprocket, a fan and the like connected to the output gear 15 by the rotation of the output gear 15.
In this case, various offset loads such as radial or thrust directions are applied to the output shaft 20. This eccentric load is output gear 1
5 is provided separately from the gears 13 and 14, is meshed with the gear 13, and is independently supported by the side plates 17 and 18, so that it can be exclusively received by the output gear 15 side. As a result, the influence of the unbalanced load remains only on the output gear 15 side, and transmission to the gears 13 and 14 side is completely blocked. As a result, the rotational performance and performance of the hydraulic oil can be further stabilized, the reliability of the device can be improved, and the device can be used even when a high load is applied.

Incidentally, such a hydraulic motor device 10 is
The inlet and outlet of the housing 12 are reversed, and the output shaft 2
It is also possible to configure the hydraulic pump by using 0 as the input shaft, and the present invention can be appropriately modified except for its main part.

[0010]

As described above, in the hydraulic motor device of the present invention, since the output gear is provided separately from the external gear rotated by the pressure of the hydraulic oil, the eccentric load applied to the output shaft is exclusively output gear system. It is possible to completely prevent the adverse effect on the side of the external gear that is rotated by the hydraulic oil. As a result, a high load applied to the output shaft side can be stably and surely absorbed, so that the applicable range of this type of motor device can be greatly expanded. In addition, the whole device has a flat shape and is relatively compact, which is suitable for downsizing of industrial equipment used and is also excellent in this respect.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing a hydraulic motor device structure according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view of a hydraulic motor device shown as a conventional example.

[Explanation of symbols]

10 hydraulic motor device, 12 housing, 13 and 14 external gears, 15 output gears, 16 oil flow paths, 17 and 18 side plates, 20 output shafts, 21 oil escape passages.

Claims (1)

[Claims] 1. A housing having an inlet and an outlet that communicate with an internal oil passage, an external gear that is built into the housing and meshes with each other, and is rotated by hydraulic oil supplied from the inlet, and interlocks with the gear. In the hydraulic motor device having an output shaft that is rotated by means of an output shaft, the output shaft is integrally coupled within the housing, and the output gear is independently supported so as to rotate in mesh with one of the external gears. At the same time, an oil escape passage communicating with the oil passage is provided in association with the output gear.