JPH0134745Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a freewheel device for a reduction gear with a hydraulic motor for rotating wheels or drums in construction machines, ships, and industrial vehicles.

For example, when a reduction gear with a hydraulic motor is used as a travel motor for rotating the wheels of construction machinery, or as a transmission directly connected to the drum of a marine winch, it may be necessary to index the vehicle due to a failure of the input drive system, or the drum It becomes necessary to idle. For this reason, a clutch such as a gear clutch is simply interposed between the input hydraulic motor and the reduction gear, and the edge of this clutch is turned off to smoothly index the vehicle or idle the drum. However, such conventional clutch devices are generally large, complicated and expensive, and require a large space. Some types insert an annular piston integrated with the annular piston, form a fluid pressure chamber on the end surface of the annular piston, and introduce pressure fluid into it to mesh the input gear with the continuous gear. Therefore, when the annular piston is pushed by the pressure fluid in the fluid pressure chamber, it is impossible to rotate the annular piston at high speed, and seals are provided on the inner and outer peripheries of the annular piston. The structure required to provide a seal was complicated, expensive, and required space.

The problem of the present invention is that in a hydraulic freewheel device having an annular piston movable in the axial direction inside the housing, the annular piston does not rotate relative to the inside of the housing under load or unload, and To provide a freewheel device which does not require a seal around the periphery, has an extremely compact structure, does not require space, and is reliable in operation so that an input gear and an output gear can rotate at high speed.

Therefore, the present invention solves the above-mentioned problems of the conventional products by providing a hydraulic freewheel device as described in the claims of the utility model registration.

With this configuration, the pilot pressure oil in the pilot oil passage that does not require space provided in the housing of the hydraulic motor on the fixed side operates the annular piston that does not require space provided on the inner circumference of the housing to drive the input gear. Press firmly to release the engagement with the connecting gear, and when the pilot pressure oil supply is cut off and the annular piston is in communication with the drain and there is no load, the return spring automatically moves the annular piston to a position where it does not press the input gear. I'm sure it will be returned,
The two enter into a state of engagement again. Therefore, the annular piston does not come into contact with the input gear when there is no load, and does not rotate relative to the inside of the housing, but allows the input gear to rotate at high speed. Although it rotates at high speed by pressing the housing, it is prevented from rotating relative to the inside of the housing. Therefore, the seal will not be damaged due to relative rotation, and there is no need to provide a seal on the inner circumference of the annular piston, so the structure is extremely compact, does not require space, has a small number of parts, and has a high speed input and output gear. This provides a freewheel device with reliable rotational operation.

Hereinafter, an embodiment of the present invention will be explained based on the drawings.The device includes a hydraulic motor 31 to which a hydraulic valve 32 is attached and fixedly supported by a member of a vehicle or a ship crane device (not shown), and a planetary speed reducer in the embodiment. and a speed reducer 33, which is a motor. The clutch input gear 1 is a hydraulic motor 31
Spline 1 is movable in the axial direction on the output shaft 13 of
2, and is made non-rotatable relative to the output shaft. A clutch coupling gear 3 having an internal spline 28 forming an internal gear meshing with the input gear 1 is spline-connected to the input shaft 23 of a reduction gear 33 . A spring 8 is stretched between the coupling gear 3 and the input gear 1 via a thrust bearing 9 that releases rotational motion, and is constantly biased so that the two are in the meshed state shown in the figure. At this time, the input gear 1 is in contact with a stopper 11 fixed to the output shaft 13. And the connecting gear 3 is the hydraulic motor 3
It is axially immovably and rotatably supported by a bearing 7 fixed to the inner periphery of the first housing 30 . Inside the housing 30 of the hydraulic motor, an annular piston 4 is arranged so as to be axially movable and whose one end 34 presses the input gear 1 against the spring 8 . The annular piston 4 has an annular cylinder chamber 38 in its complementary stepped portion 35, into which pilot pressure oil is guided by a pilot oil passage 27 provided in the housing 30. Annular piston 4
is when there is no load, that is, the pilot pressure oil is in cylinder chamber 3.
8, the input gear 1 is returned to the illustrated position in which it is not pressed by a return spring 5 whose one end abuts against a retainer 6 fixed to the housing 30. Although the reduction gear 33 is shown as a planetary reduction gear, it may be of other types, such as a reduction gear composed only of external gears. In order to simplify the structure, in the present invention, the annular cylinder chamber 38 is
It is defined by a stepped portion 36 formed on the inner periphery of the housing 30 whose diameter expands outward, and two seal members 37, 37 provided at positions that sandwich the complementary stepped portion 35 on the outer periphery of the annular piston 4. However, a cylinder sleeve may be added separately.

In the embodiment, in order to facilitate meshing between the input gear 1 and the connecting gear 3, the internal spline 28 has a sufficient clearance in the circumferential direction, but a small clearance in the radial direction. It is designed to be formed between the teeth.

When operating in the normal connected state, the annular piston 4 is in the position shown in the figure, the pilot oil passage 27 is communicated with the drain oil passage by the hydraulic valve 32, and the annular piston 4 is in an unloaded state, as shown in the figure. A return spring 5 returns the input gear 1 to the position where it is not pressed. The input gear 1 is pressed against a stopper 11 by a spring 8 and meshes with the connecting gear 3. The rotation of the hydraulic motor 31 is transmitted from the output shaft 13 to the input gear 1 via the spline 12, and then to the connecting gear 3 via the internal spline 28 forming a gear clutch. The rotation of the connecting gear 3 is controlled by an input shaft 23 which is spline-coupled, a major sun gear 15 which is spline coupled to the input shaft 23, and a planetary gear 2 that meshes with the major sun gear 15 and is supported by a carrier pin 21.
0 and the internal gear 24 that meshes with the planetary gear 20, the simple planetary gear is decelerated one step, and the reduced rotation is transmitted from the carrier 19 to the large sun gear 17 of the two-stage reduction gear, and the planetary gear that meshes with it. gear 16,
and 2 between the internal gear 24 meshing with the planetary gear 16.
The speed of each stage is decelerated, and this decelerated rotation rotates the case 14, which rotates a wheel (not shown) attached to the case 14. That is, the figure shows a traveling motor in which the hydraulic motor 31 is fixed and the reducer 33 rotates.

When it is desired to cut the edge between the reducer 33 and the hydraulic motor 31, when pilot pressure oil is supplied to the pilot oil passage 27 with the hydraulic valve 33, the pilot pressure oil enters the annular cylinder chamber 38, and the annular piston 4 is returned with this oil pressure. The internal spline 2 of the connecting gear 3 is moved to the left against the spring 5, and the input gear 1 is surely pressed against the spring 8 to move it to the left.
As a result, the reducer 33 becomes freewheeling. When reconnecting, the hydraulic valve 32 connects the pilot oil passage 27 to the drain, and the annular piston 4 is moved by the return spring 5.
Since the input gear 1 is automatically and reliably returned to the illustrated position, the input gear 1 is also reliably meshed and connected with the internal spline 28 of the connecting gear 3 by the spring 8. In the embodiment, in order to facilitate this meshing, the input gear 1 and the internal spline 28 are provided with a sufficient clearance in the circumferential direction, so that the meshing can be carried out without any problem. As can be seen from the examples, the annular piston 4 and the pilot oil passage 27 require almost no extra space, are compact and inexpensive, and are extremely reliable in operation, and can be easily operated by simply switching the hydraulic valve. It can be carried out.

[Brief explanation of the drawing]

FIG. 1 shows a partially cutaway sectional structural view showing an embodiment of the present invention, and FIG. 2 is a partially enlarged view thereof. DESCRIPTION OF SYMBOLS 1...Input gear, 3...Connection gear, 4...Annular piston, 5...Return spring, 8...Spring, 13...Output shaft, 23...Input shaft, 27...Pilot oil path, 30
...Housing, 31...Hydraulic motor, 33...Reducer, 34...One end, 35...Complementary step part, 36...Step part, 37...Seal member, 38...Annular cylinder chamber.

Claims (1)

[Scope of utility model registration request] a clutch input gear supported on the output shaft of the hydraulic motor so as to be movable in the axial direction and not rotatable relative to the output shaft; and a clutch coupling gear having a gear connected to the input shaft of the reducer and capable of meshing with the clutch input gear. , a hydraulic freewheel device comprising a spring provided between a connecting gear and an input gear and constantly biased so that the two are in a meshed state, and an annular piston movable in an axial direction inside a housing, the annular piston has a complementary step portion on the outer periphery that complements the annular step provided inside the housing, and has an end portion at one end capable of pressing the input gear against the spiraling, and the complementary step portion A pair of seal members are interposed between the housing and the inner side of the housing to sandwich the piston, thereby forming a cylinder chamber to which pilot pressure oil is guided by a pilot oil passage provided in the housing, and the annular piston is A hydraulic freewheel device characterized in that when no load is applied, the input gear is returned to a position where it is not pressed by a return spring disposed within the housing.