Brake clutch structure for PTO

Abstract

The utility model relates to a clutch structure of a marine gearbox. A brake clutch structure for a PTO comprises a box body and a PTO output shaft, the PTO output shaft is sleeved with a PTO clutch shell in a heating mode, the PTO clutch structure is installed at one end of the PTO clutch shell, a brake clutch is installed on the outer side of the PTO output shaft, and the brake clutch comprises a brake clutch shell, a brake clutch seat brake piston, a return piston and a brake clutch friction plate set. A brake working oil cavity is arranged between the brake clutch shell and the brake piston, the brake working oil cavity is communicated with a PTO lubricating oil way, a brake return oil cavity is arranged between the brake piston and the return piston, and the brake return oil cavity is communicated with a PTO working oil way. The brake clutch structure for the PTO is convenient to install, reliable in brake, thorough in brake release and timely in response. The technical problems that in the prior art, braking of an output shaft of a PTO clutch is not reliable, and response of a brake is not rapid enough when the PTO clutch is closed and arranged are solved.

Description

Technical Field

[0001] The utility model relates to a clutch structure of a marine gearbox, in particular to a clutch structure with a PTO function (auxiliary power output) and requiring that the PTO clutch cannot rotate with the gear in a disengaged state. Background Art

[0002] In the prior art, the PTO output shaft of the marine gearbox with PTO function is mostly not provided with a brake device, and the PTO output shaft of the gearbox generally rotates with the gear after the main engine is started. For a PTO shaft with a generator, the generator can be allowed to idle without excitation, but there is a problem of premature failure of the PTO output shaft due to excessive damping of the generator rotor and recoil vibration when the gearbox is reversed; for a PTO shaft with a hydraulic pump, the suction end and the oil outlet end of the hydraulic pump can be directly connected through a stop valve, so that the oil sucked out by the hydraulic pump when the PTO clutch is rotating can be directly returned to the oil pool, thereby ensuring that there is no excess hydraulic oil impacting the stability of the hydraulic system when the hydraulic system does not need hydraulic oil, but the hydraulic oil in the oil pool still circulates under the rotation of the hydraulic pump when it is not needed, which not only wastes energy, but also easily causes the hydraulic oil to deteriorate prematurely at high temperature; for a PTO shaft with an external fire pump or other water pump, the excess high-pressure water accumulated due to the rotation of the PTO clutch not only affects the working environment of the water pump outlet accessories and easily causes safety problems due to slippery ground, but also due to the long-term low-speed operation of the pump, it is easy to cause seal failure, resulting in insufficient system pressure when high-pressure work is required, thereby affecting work efficiency.

[0003] Publication patent CN201410092495.5 A fire pump gearbox with brake function provides a built-in brake. By meshing the brake housing gear with the main clutch housing gear, when braking is required, the brake friction plate is pressed and the brake housing is fixed to the brake seat fixed on the box body to achieve braking. The brake needs to be installed inside the box body, which is not conducive to the modification of the PTO clutch that is already in use and lacks the brake function. Publication patent CN201010042061.6 A reversible gearbox with fast reversing provides a brake solution installed on the outer end of the reverse drive shaft. Its principle is to use piston compression and spring return. It only describes the working principle of the brake, but does not describe its working relationship with the forward clutch and the reverse clutch, that is, how to achieve reliable braking while ensuring that the brake is not operated due to misoperation when the reverse clutch is not working. The prior art marine gearbox with PTO function cannot solve the problem of reliable braking of the output shaft of the PTO clutch or reliable and rapid brake disengagement response when the PTO clutch is working. Utility Model Content

[0004] The utility model provides a PTO brake clutch structure with a simple structure, which does not affect the structure of the original PTO clutch, is easy to install, realizes reliable braking, complete brake release, and timely response; it solves the technical problems existing in the prior art that the braking of the PTO clutch output shaft is unreliable and the brake response is not fast enough when the PTO clutch is working.

[0005] The above technical problems of the utility model are solved by the following technical solutions: a brake clutch structure for PTO, including a housing, a PTO output shaft is arranged in the housing, a PTO clutch housing is heat-shrink-fitted on the outside of the PTO output shaft, a PTO working oil circuit and a PTO lubricating oil circuit are arranged in the PTO output shaft, a PTO input gear is sleeved on the PTO output shaft, a PTO clutch structure is installed at one end of the PTO clutch housing, a brake clutch is installed on the outside of the PTO output shaft, the brake clutch includes a brake clutch housing, a brake clutch seat brake piston, a return piston and a brake clutch friction plate group, a brake working oil chamber is arranged between the brake clutch housing and the brake piston, the brake working oil chamber is connected to the PTO lubricating oil circuit, a brake return oil chamber is arranged between the brake piston and the return piston, and the brake return oil chamber is connected to the PTO working oil circuit. The brake working oil chamber control oil circuit is connected to the system lubricating oil circuit, and the low-pressure lubricating oil acts on the large-area brake piston to achieve effective braking. The oil chamber between the brake piston and the return piston is set as the working oil chamber for the brake clutch to disengage. The brake clutch is controlled by introducing the PTO clutch working oil circuit, and the absolute difference between the PTO clutch working oil and the system lubricating oil is used to ensure that the brake clutch is completely disengaged. The brake clutch is closed and braked by controlling the brake clutch disengagement and testing the system lubricating oil through the shared PTO clutch working oil, so that the working relationship between the PTO clutch and the brake clutch is reliably interlocked. Ensure that the brake responds quickly and the braking is reliable. At the same time, the brake clutch structure is set on one side of the PTO housing, which is convenient for the modification of the existing PTO clutch, reducing the cost, and the existing equipment can be quickly modified to achieve reliable braking and rapid response.

[0006] Preferably, a PTO rear end cover is installed at the other end of the PTO clutch housing, and the brake clutch housing is connected to the PTO clutch rear end cover.

[0007] Preferably, the brake clutch seat is connected to the PTO output shaft.

[0008] Preferably, a return piston is fixed at the center of the brake clutch housing. The return piston and the brake clutch housing are fixed, and when the brake return oil chamber is filled with working oil, the working oil pressure pushes the brake piston to move in the reverse direction, allowing the brake piston to release the brake clutch friction plate group, thereby allowing the PTO output shaft to rotate freely.

[0009] Preferably, the end surface area of ​​the brake piston is larger than the end surface area of ​​the return piston.

[0010] Preferably, the brake clutch seat is provided with a PTO lubricating oil interface and a PTO working oil interface, and the working oil pressure is greater than the lubricating oil pressure.

[0011] Preferably, one side of the brake clutch friction plate group is connected to the brake piston, and the brake clutch friction plate group is sleeved on the brake clutch seat. The brake clutch friction plate group presses the brake clutch seat under the push of the brake piston, so that the PTO output shaft and the clutch housing remain stationary.

[0012] Therefore, the utility model of a PTO brake clutch structure has the following advantages: adding a brake clutch structure to the outside of the PTO clutch can improve the original structure, with low cost and easy installation; by arranging a large-area brake piston inside the brake device and a small-area high-pressure return disengagement brake piston, the system lubrication oil circuit is used for braking and the PTO clutch working oil circuit is used for disengagement braking, thereby achieving reliable braking, thorough disengagement braking and timely response functions, and is conducive to the modification of existing products in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a cross-sectional view of a brake clutch structure for a PTO.

[0014] Figure 2 yes Figure 1 Enlarged view of point A. DETAILED DESCRIPTION

[0015] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0016] Embodiment 1:

[0017] like Figure 1 As shown, a brake clutch structure for a PTO includes a housing 1, in which a PTO clutch mechanism and a brake mechanism arranged at one end of the PTO clutch are arranged.

[0018] The PTO clutch mechanism includes a PTO clutch housing 2, a PTO rear end cover 10 is fixed at one end of the PTO clutch housing 2, the PTO clutch housing 2 is shrink-fitted on the PTO output shaft 4, and a PTO output coupling 11 is installed on one side of the PTO output shaft 4. A PTO input gear 2 is loosely sleeved on the PTO output shaft 4 through a bearing. A PTO working oil circuit 5 and a PTO lubricating oil circuit 6 are provided in parallel in the PTO output shaft 4, the PTO working oil circuit 5 inputs working oil 18 through an external PTO working oil inlet, and the PTO lubricating oil circuit 6 inputs lubricating oil through an external PTO lubricating oil interface 17. It also includes a PTO clutch working piston 9 arranged in the PTO clutch housing 2 and loosely sleeved on the PTO output shaft 4, a PTO clutch seat 8 fixedly connected to one end of the PTO input gear, and a PTO clutch friction plate group 7 arranged between the PTO clutch housing 2 and the PTO clutch seat 8.

[0019] like Figure 2 As shown, the brake mechanism of the PTO clutch is mainly composed of a brake clutch seat 15 fixedly connected to the outer side of the PTO output shaft, a brake clutch housing 12 fixedly connected to the rear end cover 10 of the PTO clutch, a return piston 14 fixedly connected to the center of the brake clutch housing 12, a brake piston 13 arranged between the brake clutch housing 12 and the return piston 14, and a brake clutch seat friction plate 16 group arranged between the brake clutch housing 12 and the brake clutch seat 15. One side of the brake clutch friction plate group 16 is connected to the brake piston 13, and the other side of the brake clutch friction plate group 16 is connected to the brake clutch seat 15. The brake working oil chamber 19 between the brake clutch housing 12 and the brake piston 13 is connected to the system lubricating oil circuit, and the brake return oil chamber 20 between the brake piston 13 and the return piston 14 is connected to the PTO clutch working oil circuit. The end surface area of ​​the brake piston 13 is larger than the end surface area of ​​the return piston 14. The brake clutch seat is provided with a PTO lubricating oil interface 17 and a PTO working oil interface 18, and the working oil pressure is greater than the lubricating oil pressure.

[0020] Working principle:

[0021] Braking state: Power is input by the PTO input gear 2, which is loosely sleeved on the PTO output shaft 4 through the bearing. The PTO input gear 2 drives the PTO clutch seat 8 connected to it to rotate, and the PTO clutch seat 8 drives the inner friction plate in the PTO clutch friction plate group 7 connected to it through the spline to rotate. When the PTO clutch is in the disengaged state, the PTO clutch friction plate group is not compressed. Because there is viscous hydraulic oil between the inner and outer friction plates, the outer friction plate will follow the inner friction plate to slide and rotate under the friction resistance of the hydraulic oil, that is, the belt row follows the rotation. At this time, the brake clutch set at the output shaft end pushes the brake piston 13 to compress the brake clutch friction plate group 16 under the action of the lubricating oil, so that the PTO output shaft 4 and the PTO clutch housing 2 remain stationary, that is, to ensure that the PTO output shaft 4 does not rotate.

[0022] Working status of PTO clutch: When the PTO output shaft 4 needs to work, the high-pressure working oil of the PTO clutch is controlled to enter the PTO clutch, pressing the friction plate group 7 of the PTO clutch, and the power is output to the PTO output shaft 4 through the PTO input gear 3, PTO clutch seat 8, and PTO clutch. At the same time, the high-pressure working oil of the PTO clutch is controlled to enter the return oil chamber 20 of the brake clutch. Since the return piston 14 is fixed, the high-pressure oil in the return oil chamber 20 pushes the brake piston 13 to return, loosening the clamping relationship between the brake clutch seat 15 and the PTO clutch housing 2, so that the PTO output shaft 4 can rotate freely.

[0023] The specific embodiments described herein are merely examples of the concept of the present invention. A person skilled in the art of the present invention may make various modifications or additions to the specific embodiments described or replace them in a similar manner, but this will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A brake clutch structure for a PTO, comprising a housing, a PTO output shaft is arranged in the housing, a PTO clutch housing is thermally sleeved on the outside of the PTO output shaft, a PTO working oil circuit and a PTO lubricating oil circuit are arranged in the PTO output shaft, a PTO input gear is sleeved on the PTO output shaft, and a PTO clutch structure is installed at one end of the PTO clutch housing, characterized in that: A brake clutch is installed on the outside of the PTO output shaft. The brake clutch includes a brake clutch housing, a brake clutch seat, a brake piston, a return piston and a brake clutch friction plate group. A brake working oil chamber is provided between the brake clutch housing and the brake piston. The brake working oil chamber is connected to the PTO lubricating oil circuit. A brake return oil chamber is provided between the brake piston and the return piston. The brake return oil chamber is connected to the PTO working oil circuit.

2. A PTO brake clutch structure according to claim 1, characterized in that: The other end of the PTO clutch housing is provided with a PTO rear end cover, and the brake clutch housing is connected with the PTO clutch rear end cover.

3. A PTO brake clutch structure according to claim 1 or 2, characterized in that: The brake clutch seat is connected with the PTO output shaft.

4. A PTO brake clutch structure according to claim 1 or 2, characterized in that: A return piston is fixed at the center of the brake clutch housing.

5. A PTO brake clutch structure according to claim 1 or 2, characterized in that: The end surface area of ​​the brake piston is larger than the end surface area of ​​the return piston.

6. A PTO brake clutch structure according to claim 1 or 2, characterized in that: The brake clutch seat is provided with a PTO lubricating oil interface and a PTO working oil interface, and the working oil pressure is greater than the lubricating oil pressure.

7. A PTO brake clutch structure according to claim 1 or 2, characterized in that: One side of the brake clutch friction plate group is connected to the brake piston, and the brake clutch friction plate group is sleeved on the brake clutch seat.

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