CN219035507U

CN219035507U - General PTO assembly

Info

Publication number: CN219035507U
Application number: CN202223578149.7U
Authority: CN
Inventors: 谢奎豹; 王伟兴
Original assignee: Wuhu Zeyu Gear Manufacturing Co ltd
Current assignee: Wuhu Zeyu Gear Manufacturing Co ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2023-05-16
Anticipated expiration: 2032-12-21

Abstract

The universal PTO assembly comprises a gear shaft, a PTO shell and a bearing assembly, wherein the gear shaft is provided with a through inner hole, an inner spline is arranged in the inner hole, a conversion sleeve is arranged in the inner spline, the conversion sleeve is provided with an outer spline matched with the inner spline, and the conversion sleeve is also provided with a connecting structure corresponding to an input shaft of external equipment; and two ends of the internal spline are provided with check rings which are used for limiting the axial movement of the conversion sleeve. Compared with the existing PTO assembly, the universal PTO assembly omits a flange cover, simplifies the structure of the conversion sleeve and reduces the production cost; secondly, the double-row self-aligning roller bearing is used for replacing a sliding bearing, so that the friction loss of the bearing is reduced; thirdly, the problem of oil seepage and dust entering at the spline connection part of the gear shaft is solved; fourth, the universality of connection with external equipment is greatly expanded.

Description

General PTO assembly

Technical Field

The utility model relates to the field of engines, in particular to a universal PTO assembly.

Background

PTO (POWER-TAKE-OFF) is a POWER TAKE-OFF device attached to the engine of a vehicle, also known as a POWER TAKE-OFF. The PTO is a device that outputs power of an engine to a device other than a running system, and a hydraulic pump or other devices can be driven by the power from the engine through the PTO. PTO has wide application in engineering vehicle field and agricultural machinery field, such as dumper, cement mixer truck, rotary tillage tractor, combine harvester, etc.

Because the devices and equipment that require power from the PTO are diverse, the PTO is required to provide multiple connection modes, and even if spline connection modes are used as well, different sized splines cannot be connected. The 201811533092.4 patent discloses a new PTO assembly for a diesel engine that solves the problem of mismatch between different devices and the PTO output interface by means of a replaceable adapter PTO housing. However, this PTO assembly also suffers from the following disadvantages:

1. the structure is complex, the parts are more, and the whole processing cost is high;

2. the sealing effect of the inner hole part of the gear shaft is poor, and oil seepage and dust inlet phenomena occur at the spline connection part;

3. the sliding bearing has large friction loss and is easy to generate heat and wear.

Thus, there is a need for improvements to existing PTO assemblies.

Disclosure of Invention

In order to overcome the defects in the background technology, the utility model discloses a general PTO assembly, which adopts the following technical scheme:

the universal PTO assembly comprises a gear shaft, a PTO shell and a bearing assembly, wherein the gear shaft is provided with a through inner hole, an inner spline is arranged in the inner hole, a conversion sleeve is arranged in the inner spline, the conversion sleeve is provided with an outer spline matched with the inner spline, and the conversion sleeve is also provided with a connecting structure corresponding to an input shaft of external equipment; and two ends of the internal spline are provided with check rings which are used for limiting the axial movement of the conversion sleeve.

Further improving the technical scheme, the connection structure of the conversion sleeve corresponding to the input shaft of the external equipment is a flat key connection structure.

According to the technical scheme, a spline connection structure is adopted as a connection structure of the conversion sleeve corresponding to the input shaft of the external equipment.

Further improving the technical scheme, a stepped hole is arranged in the inner hole, and a plug is arranged in the stepped hole.

According to the technical scheme, a hole check ring is arranged in the stepped hole and used for limiting the axial movement of the plug.

The technical scheme is further improved, and the bearing assembly comprises two rolling bearings, an inner spacer, an outer spacer, a lock nut and a bearing end cover.

According to the technical scheme, an annular groove is formed in the gear shaft, a safety locking plate is arranged in the annular groove, and the safety locking plate is positioned between a locking nut and a rolling bearing; the safety locking plate is an annular piece formed by two semicircular rings, wherein the thickness of the annular piece is smaller than the groove width of the annular groove.

Further improving the technical scheme, the rolling bearing is a double-row self-aligning roller bearing or a single-row self-aligning roller bearing.

Further improving the technical scheme, the diameter of the gear part of the gear shaft is smaller than the outer diameter of the PTO shell.

By adopting the technical scheme, compared with the background technology, the utility model has the following beneficial effects:

1. the universal PTO assembly omits a flange cover, simplifies the structure of the conversion sleeve, and reduces the production cost;

2. the universal PTO assembly replaces a sliding bearing with the double-row self-aligning roller bearing, so that the friction loss of the bearing is reduced;

3. the universal PTO assembly solves the problems of oil seepage and dust entering at the spline connection part of the gear shaft;

4. the universal PTO assembly greatly expands the universality of connection with external equipment.

Drawings

Fig. 1 is a schematic view showing the structure of the present universal PTO assembly in embodiment 1.

Fig. 2 shows a schematic structural view of the safety locking piece.

Fig. 3 is a schematic view showing the structure of the present universal PTO assembly in embodiment 2.

Fig. 4 shows a schematic illustration of an embodiment of a conversion sleeve.

Fig. 5 shows a schematic illustration of a further embodiment of a conversion sleeve.

In the figure: 1. a PTO housing; 2. a gear shaft; 3. a plug; 4. a retainer ring A for holes; 5. double-row self-aligning roller bearing; 6. an inner spacer; 7. an outer spacer; 8. a bearing end cap; 9. a retainer ring B for holes; 10. a conversion sleeve; 11. a framework oil seal; 12. a lock nut; 13. a safety locking plate; 14. an O-shaped sealing ring; 15. an input shaft of external equipment; 16. an engine housing.

Detailed Description

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present utility model, and are not intended to limit the scope of the present utility model. It should be noted that, in the description of the present utility model, terms such as "front", "rear", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus are not to be construed as limiting the present utility model. It should also be noted that, in the description of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

Example 1:

a universal PTO assembly, as shown in fig. 1, is mounted on an engine housing 16 for connection to an external device input shaft 15 for providing rotational power to the external device. In this embodiment, the external device is a hydraulic pump. The present general type PTO assembly includes a gear shaft 2, a PTO housing 1 and a bearing assembly, the structure and function of which are described in detail below.

The left end of the gear shaft 2 is a gear part which is meshed with a gear in the engine, and can extract rotary power. The diameter of the gear portion is smaller than the outer diameter of the left end of the PTO housing 1, which has the advantage that the PTO assembly can be removed in its entirety during maintenance. The gear shaft 2 has a through inner hole, and an inner spline is provided in the inner hole. The through inner hole can accommodate the external equipment input shaft 15 with different lengths, and the internal spline is connected with the external spline on the external equipment input shaft 15 in a matched manner, so that rotary power can be provided for the external equipment input shaft 15.

In the patent with the application number of 201811533092.4, the gear shaft 2 is also connected with the input shaft 15 of the external device through a spline, but lubricating oil and external dust in the engine can freely enter and exit through gaps between the internal spline and the external spline, so that oil seepage and dust entering phenomena are caused. For this purpose, a stepped hole is provided at one end of the inner hole near the gear portion, and a plug 3 is installed in the stepped hole. The plug 3 is made of high temperature resistant fluororubber material and has certain elasticity. During installation, the plug 3 is pressed into the stepped hole, so that the plug 3 is in interference fit with the stepped hole. In order to prevent the plug 3 from falling into the engine case 16, a hole retainer A4 is provided in the stepped hole. This prevents the lubricant from leaking out of the engine case 16 and also prevents external dust from entering the engine case 16.

The exterior of the PTO housing 1 has a connection flange and connection holes for securing the PTO housing 1 to the engine housing 16. The PTO housing 1 has a bearing chamber therein in which the bearing assembly and the gear shaft 2 are mounted. In this embodiment, the bearing assembly comprises two rolling bearings, an inner spacer 6, an outer spacer 7, a safety locking tab 13, a locking nut 12 and a bearing end cap 8. In this embodiment, the rolling bearing adopts double-row self-aligning roller bearings 5, and an inner spacer 6 and an outer spacer 7 are respectively installed between the two double-row self-aligning roller bearings 5. The lock nut 12 is in threaded connection with the gear shaft 2, the bearing end cover 8 is in threaded connection with the PTO shell 1, and the lock nut 12 and the bearing end cover 8 respectively prop against the inner ring and the outer ring of the double-row self-aligning roller bearing 5 to perform pretightening force adjustment on the inner ring and the outer ring of the double-row self-aligning roller bearing 5.

As shown in fig. 1 and 2, a safety lock piece 13 is installed in the ring groove, and the safety lock piece 13 is located between the lock nut 12 and the right double-row self-aligning roller bearing 5. The safety locking plate 13 is of a double-petal structure, each petal is semi-annular, the two semicircular rings are encircled to form an annular piece, and the annular piece is clamped in the annular groove. The groove width of the ring groove is larger than the thickness of the safety locking piece 13, so that the safety locking piece 13 has a certain axial movement amount in the ring groove. The function of the safety locking piece 13 is to prevent large axial movements of the double-row self-aligning roller bearing 5 in the event of loosening of the locking nut 12. In addition, the right end of the lock nut 12 has a thinner ring belt, and when the lock nut 12 is locked in place, the ring belt is knocked to deform and then is clamped at a notch (not shown in the figure) of the gear shaft 2, so that the lock nut 12 can be prevented from loosening.

Compared with a sliding bearing, the double-row self-aligning roller bearing 5 has the advantages of large bearing capacity, small friction loss, self-aligning effect and lower installation requirement on an input shaft 15 of external equipment, and meets the unbalanced load acting requirement of the gear shaft 2. In order to seal the double-row self-aligning roller bearing 5, a skeleton oil seal 11 is provided between the gear shaft 2 and the bearing end cap 8. In order to achieve a seal between the PTO housing 1 and the engine housing 16, two O-rings 14 are provided on the outer circumferential surface of the PTO housing 1.

Compared with the PTO assembly in the patent with the application number of 201811533092.4, the universal PTO assembly omits a flange cover, and reduces the cost; secondly, the double-row self-aligning roller bearing 5 is used for replacing a sliding bearing, so that friction loss is reduced; thirdly, the problem of oil seepage and dust entering at the spline connection position of the gear shaft 2 is solved.

Example 2:

as shown in fig. 3, this embodiment is different from embodiment 1 in that a conversion sleeve 10 is provided in an internal spline, and the conversion sleeve 10 has an external spline that matches the internal spline and also has a connection structure corresponding to an external device input shaft 15. Hole check rings B9 are arranged at two ends of the internal spline, and the hole check rings B9 are used for limiting the axial movement of the conversion sleeve 10.

As shown in fig. 4, the connection structure of the conversion sleeve 10 corresponding to the input shaft 15 of the external device is an internal spline connection structure. The external device input shaft 15 is usually of an internally splined connection, but with different SAE standards. In the present embodiment, the conversion sleeve 10 is replaced by removing the hole retainer ring B9 at the outer end. Thus, the connection of the conversion sleeve 10 to the different external input shafts 15 can be achieved by providing a plurality of conversion sleeves 10.

It should be noted that, the connection structure of the conversion sleeve 10 corresponding to the input shaft 15 of the external device is not limited to the internal spline connection structure, and as shown in fig. 5, the connection structure of the conversion sleeve 10 corresponding to the input shaft 15 of the external device may be a flat key connection structure. The external device input shaft 15 with different shaft diameters can be matched by replacing different conversion sleeves 10.

As can be seen from the above, compared with the PTO assembly in the patent application No. 201811533092.4, the universal PTO assembly simplifies the structure of the adapter sleeve 10 and expands the versatility of connecting the universal PTO assembly with the external device.

The parts not described in detail are prior art. Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the utility model as defined by the appended claims and their equivalents.

Claims

1. The utility model provides a general type PTO assembly, includes gear shaft, PTO casing and bearing assembly, and wherein, the gear shaft has the hole that link up, is equipped with the internal spline in the hole, characterized by: a conversion sleeve is arranged in the internal spline, and is provided with an external spline matched with the internal spline and a connecting structure corresponding to an input shaft of external equipment; and two ends of the internal spline are provided with check rings which are used for limiting the axial movement of the conversion sleeve.

2. A universal PTO assembly according to claim 1 and characterized in that: the connecting structure of the conversion sleeve corresponding to the input shaft of the external equipment is a flat key connecting structure.

3. A universal PTO assembly according to claim 1 and characterized in that: the connecting structure of the conversion sleeve corresponding to the input shaft of the external equipment is a spline connecting structure.

4. A universal PTO assembly according to claim 1 and characterized in that: the inner hole is internally provided with a stepped hole, and a plug is arranged in the stepped hole.

5. A universal PTO assembly as claimed in claim 4 wherein: and a hole check ring is arranged in the stepped hole and used for limiting the axial movement of the plug.

6. A universal PTO assembly according to claim 1 and characterized in that: the bearing assembly comprises two rolling bearings, an inner spacer, an outer spacer, a lock nut and a bearing end cover.

7. A universal PTO assembly according to claim 6 and characterized in that: the gear shaft is provided with an annular groove, a safety locking plate is arranged in the annular groove, and the safety locking plate is positioned between the locking nut and the rolling bearing; the safety locking plate is an annular piece formed by two semicircular rings, wherein the thickness of the annular piece is smaller than the groove width of the annular groove.

8. A universal PTO assembly according to claim 6 and characterized in that: the rolling bearing is a double-row self-aligning roller bearing or a single-row self-aligning roller bearing.

9. A universal PTO assembly according to claim 1 and characterized in that: the gear portion of the gear shaft has a diameter smaller than the outer diameter of the PTO housing.