CN117419151A - Transfer case, power assembly and agricultural machine - Google Patents

Abstract

The utility model relates to the field of vehicles and discloses a transfer case, a power assembly and agricultural machinery, wherein the transfer case comprises a case body (1), a driving gear (2) arranged on a driving shaft (3) and a plurality of driven gears (4) meshed with the driving gear, a lubricating oil pump (6) in transmission connection with the driving shaft (3) is arranged on the case body (1), an oil suction port of the lubricating oil pump is communicated with an inner cavity of the case body (1), an oil discharge port of the lubricating oil pump is communicated with a lubricating part in the case body (1), and the driving shaft (3) drives the driven gears (4) to rotate through the driving gear (2) and simultaneously drives the lubricating oil pump (6) to forcedly pump lubricating oil in the case body (1) to the lubricating part. The transfer case can reduce or avoid the complicacy problem of the composition and arrangement of the components in the transfer case body caused by the arrangement and the arrangement of the lubricating oil pump, and has the advantages of compact design, high space utilization rate and the like.

Description

Transfer case, power assembly and agricultural machine

Technical Field

The utility model relates to the field of vehicles, in particular to a transfer case. On the basis, the utility model also relates to a power assembly and an agricultural machine comprising the transfer case.

Background

As the sugar industry develops, the market demand for sugar cane as a main raw material for the sugar industry is increasing. In the sucrose production, sugarcane harvesting mechanization is a key weak link for improving production efficiency and reducing production cost, and at present, the technical development of a sugarcane harvester is still in a primary stage, and the performance stability and reliability of the sugarcane harvester have important influence on improving market competitiveness due to the characteristics of obvious working cycle, large work load and the like.

Typically, agricultural machinery or other vehicles, such as sugar cane harvesters, may be provided with power take-offs and transmissions such as an engine, transfer case and power pump, with the power output by the engine being distributed among the transfer case to different output shafts, which in turn drive a plurality of power pumps to output power to different work machines. In the working process, long-time high-load work can cause the oil temperature in the transfer case to be higher, so that good lubrication cannot be carried out on bearings, transmission gears and the like, component damage is easy to occur, meanwhile, the aging and failure of related sealing elements are easy to accelerate due to the high temperature, and the maintenance cost of the transfer case is increased. For this purpose, a lubricant pump driven by an electric motor or an engine may be provided on the transfer case to circulate the lubricant to the lubrication site, and the lubricant is cooled by heat dissipation by a heat dissipation device during the transportation.

For example, chinese patent No. CN218094124U discloses a transfer case with heat dissipation function, which is provided with a pump body at the bottom of the case, for extracting high-temperature lubricating oil in the case and conveying the lubricating oil back into the case through a return line. Wherein, be equipped with the cooling mechanism for cooling off the pipe form on the return line for example, can be cooled off when high temperature lubricating oil flows in this return line, the lubricating oil after the cooling off can be poured into the transfer case box again from this into, carries out the cooling treatment to spare part wherein. In the transfer case, a transmission shaft is arranged on a pump body, the transmission shaft is provided with a transmission gear, and the transmission gear is in meshed connection with any one of a driving gear, an intermediate gear and an output gear which are connected with an output shaft in the transfer case body, so that the power transmitted by the automobile gearbox is received, and pumped lubricating oil circularly flows.

However, although the above-mentioned prior art can utilize the energy of the transfer case itself to drive the pump body to rotate, thereby achieving the circulating pumping and cooling of the lubricating oil, it requires an additional transmission shaft and transmission gear for receiving power in the transfer case, which results in complicating the composition and arrangement of the components in the transfer case. In addition, the groove for accommodating the pump body is arranged at the bottom of the box body, and the cooling mechanism occupies extra space at the outer side of the box body, so that the transfer case is heavy overall and occupies more installation space.

Disclosure of Invention

The transfer case aims to solve the problems of complexity in component composition and arrangement of the transfer case body and large space occupation of the transfer case in the prior art, and the transfer case can reduce or avoid the problems of complexity in component composition and arrangement of the transfer case body caused by arrangement and arrangement of a lubricating oil pump and has the advantages of compact design, high space utilization rate and the like.

In order to achieve the above object, according to one aspect of the present utility model, there is provided a transfer case, including a case, a driving gear rotatably mounted in the case, and a plurality of driven gears engaged with the driving gear and uniformly distributed around the driving gear, wherein the driving gear is disposed on a driving shaft, the driving shaft is capable of being drivingly connected to a power source on a first side of the case, a lubrication pump coaxially disposed with the driving shaft and drivingly connected to the driving shaft is mounted on a second side of the case opposite to the first side, an oil suction port of the lubrication pump is connected to an inner cavity of the case, and an oil discharge port is connected to a lubrication site in the case, so that the driving shaft drives the driven gears to rotate through the driving gear, and the driving shaft also drives the lubrication pump to forcibly pump the lubrication oil in the case to the lubrication site.

Preferably, the transfer case comprises four driven gears uniformly distributed around the circumference of the driving gear, and the centers of any two adjacent driven gears are positioned in the same horizontal plane or the same vertical plane.

Preferably, the driving gear and the driven gear are bevel gears respectively, wherein the driving gear and the driving shaft are integrally formed.

Preferably, a pump housing of the lubricant pump is detachably connected to the housing, and a threaded hole is formed on an end surface of the driving gear and/or the driven gear facing the second side of the housing.

Preferably, an oil suction port of the lubricating oil pump is communicated to the inner cavity of the box body through an oil suction pipeline, and the oil suction pipeline is connected to the bottom of the box body; the oil drain port of the lubricating oil pump is communicated to the lubricating part of the box body through an oil drain pipeline, the oil drain pipeline is connected to the top of the box body, and a heat radiating unit is arranged on an oil path between the oil drain port of the lubricating oil pump and the box body.

Preferably, the heat dissipation unit is located above the box body, and/or the heat dissipation unit is a heat dissipation copper pipe extending spirally.

Preferably, the lubricant pump is provided as a variable displacement pump integrated with an electromagnetic control valve, the transfer case further having a temperature sensor for detecting the oil temperature of the lubricant, the electromagnetic control valve being capable of controlling the displacement of the variable displacement pump in dependence on the oil temperature detected by the temperature sensor.

Preferably, a lubricant filler pipe is detachably connected to the bottom of the tank, the lubricant filler pipe being arranged at least partially transparent to allow the lubricant level in the tank to be observed through the transparent portion.

A second aspect of the present utility model provides a power assembly comprising an engine and a transfer case as described above, wherein the drive shaft of the transfer case is drivingly connected to the power output end of the engine, the driven gears are drivingly connected to power pumps, respectively, and the lubrication pump is located in a space surrounded by a plurality of the power pumps.

A third aspect of the utility model provides an agricultural machine comprising a transfer case or powertrain as described above.

Through the technical scheme, the transfer case can be used for directly driving the lubricating oil pump to pump lubricating oil by the driving shaft for receiving power output by a power source (such as an engine) so as to forcedly pump the lubricating oil to a lubricating part and forcedly lubricate and cool related parts such as gears, bearings and the like. Because no additional transmission structure is arranged in the transfer case body, the lubricating oil pump directly receives the power of the driving shaft, and an intermediate transmission element is omitted, so that the complicating problem of the composition and arrangement of the components in the transfer case body can be effectively avoided. The driving shaft is connected to the power source on the first side of the box body in a transmission manner, and the lubricating oil pump is mounted on the second side, opposite to the first side, of the box body, so that the lubricating oil pump can fully utilize the space between transfer power output units (such as the power pump), and the space outside the box body is not required to be occupied additionally, and the design compactness and space utilization rate of the transfer case are effectively improved.

Drawings

FIG. 1 is a perspective view of a powertrain according to a preferred embodiment of the present utility model;

FIG. 2 is a perspective view of a transfer case according to a preferred embodiment of the present utility model;

FIG. 3 is a front view of the transfer case of FIG. 2;

FIG. 4 is a cross-sectional view of the transfer case of FIG. 2;

FIG. 5 is a front elevational view of the arrangement of the drive and driven gears of the transfer case of FIG. 2;

fig. 6 is a side view of the arrangement of the driving gear and the driven gear of fig. 5.

Description of the reference numerals

100-transfer case; 1-a box body; 2-a drive gear; 3-a driving shaft; 4-driven gears; 4 a-a threaded hole; 5-a driven shaft; 6-a lubricating oil pump; 7-an oil suction pipeline; 8-an oil discharge pipeline; 9-a heat dissipation copper pipe; 10-lubricating oil filling pipe; 11-hinging bolts; 12-fixing clips; 13-plugs; 14-an oil absorption joint; 15-an oil injection joint; 16-hanging rings; 17-oil drain plugs; 18-a power pump; 200-engine.

Detailed Description

The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.

Referring to fig. 1, the present utility model provides a power assembly for use in agricultural machinery such as a sugarcane harvester, comprising an engine 200 and a transfer case 100, wherein a plurality of power pumps 18 are mounted on a side of the transfer case 100 facing away from the engine 200, and power output by the engine 200 can be distributed to the power pumps 18 through the transfer case 100 to perform different actions. For example, for a sugar cane harvester, this can facilitate the formation of an all-hydraulic drive pattern, thereby better accommodating harsh operating environments. It should be noted that, although the power assembly and the transfer case of the present utility model will be described in detail herein and below mainly using a transfer power output manner in the form of hydraulic pressure, the transfer case 100 may output transfer power in other manners, such as by mechanically driving the driven shaft thereof to the corresponding operating mechanism, and is not limited to the form of hydraulic driving based on the power pump 18. In addition, the power source is not limited to the engine 200, and may be replaced with other forms of power sources such as a motor.

Referring to fig. 2 to 6, a transfer case usable in the above-described power assembly according to a preferred embodiment of the present utility model includes a case 1, a driving gear 2 rotatably installed in the case 1, and a plurality of driven gears 4 engaged with the driving gear 2 and uniformly distributed around the driving gear 2, respectively. The driving gear 2 is disposed on the driving shaft 3, for example, is integrally formed with the driving shaft 3 or is connected to the driving shaft 3 through a spline or other structure, and the driving shaft 3 can be drivingly connected to a power source such as the engine 200 on the first side of the housing 1, for example, a flywheel of the engine 200 may be connected to the driving shaft 3 through a coupling. Thus, the engine 200 outputs rotational power to drive the drive shaft 3 and the drive gear 2 to rotate, and further to drive the plurality of driven gears 4 engaged with the drive gear 2 to rotate, and distributes the power to different output shafts (i.e., the driven shafts 5), thereby outputting the power to different working mechanisms. Typically, a plurality of power pumps 18, each drivingly connected to the driven shaft 5, may be mounted on a second side of the casing 1 opposite to the first side, so as to output the transfer power in a hydraulic form.

In order to ensure the lubrication and cooling effect of the gear, bearing etc. parts, the transfer case is also provided with a lubrication pump 6 on the second side, e.g. its pump housing is detachably connected to the second side of the case 1, the lubrication pump 6 is arranged coaxially with the driving shaft 3 and drivingly connected to the driving shaft 3 (e.g. the driving shaft 3 is splined to the input shaft of the lubrication pump 6), while its oil suction port communicates to the inner cavity of the case 1, and the oil discharge port communicates to the lubrication site in the case 1. With this arrangement, while the driving shaft 3 drives the driven gear 4 to rotate (output transfer power) through the driving gear 2, the driving shaft 3 also drives the lubricant pump 6 to forcibly pump the lubricant in the case 1 to the lubrication portion, so as to forcibly lubricate and cool the related parts such as gears and bearings.

In the transfer case, the lubricating oil pump 6 directly receives the power of the driving shaft 3 without arranging an additional transmission structure in the case body 1, so that an intermediate transmission element is omitted, and the complicating problem of the composition and arrangement of the components in the transfer case body can be effectively avoided. In addition, the driving shaft 3 is in transmission connection with the power source at the first side of the box body 1, and by installing the lubricating oil pump 6 at the second side of the box body 1 opposite to the first side, the lubricating oil pump 6 can fully utilize the space between transfer power output units (such as the power pump 18) without occupying the space outside the box body 1 additionally, so that the design compactness and space utilization rate of the transfer case are effectively improved. In particular, in the case where the power pumps 18 are directly mounted to the second side of the casing 1, each power pump 18 is arranged coaxially with the corresponding driven shaft 5 and driven gear 4, and the space surrounded by these power pumps 18 may be used for arranging the lubricant pump 6, whereby the lubricant pump 6 may be arranged coaxially with the driving shaft 3 and driving gear 2, thereby making full use of the space on the second side of the casing 1.

In a preferred embodiment, the oil suction port of the lubricating oil pump 6 can be connected to the inner cavity of the tank 1 through the oil suction pipeline 7 and can be connected to the bottom of the tank 1 through the oil suction joint 14; the oil drain of the lubricant pump 6 can be connected to the lubrication site of the tank 1 via an oil drain line 8 and can be connected to the top of the tank 1, e.g. via several oil spray joints 15. Similar to the arrangement of the lubricant pump 6, the oil suction line 7 and the oil discharge line 8 may be arranged to extend between adjacent power pumps 18 to further increase the space utilization of the second side of the tank 1.

The heat dissipation unit can be arranged on an oil path between the oil drain port of the lubricating oil pump 6 and the box body 1, so that heat can be dissipated intensively by the heat dissipation unit in the process of circularly conveying lubricating oil, and the temperature of the lubricating oil can be effectively reduced. The heat dissipation unit may be disposed in a cool air ventilation area of the engine fan, for example, the heat dissipation unit may be disposed above the case 1, so as to effectively take away heat thereof along with operation of the engine fan, and ensure a heat dissipation effect.

The heat dissipation unit may be provided in various suitable structural forms, such as a fin type heat sink, a tube type heat sink, etc. In the illustrated preferred embodiment, the heat radiating unit is provided as a heat radiating copper pipe 9 extending spirally, and the heat radiating copper pipe 9 can secure flow stability of lubricating oil and has a good heat radiating effect and a simple structure compared to other forms of heat radiating units. The heat dissipation copper pipe 9 may be fixed at a predetermined position by a fixing clip or the like to avoid the risk of damage due to vibration.

In addition, a filtering device can be arranged on the circulation loop of the lubricating oil and used for filtering impurities generated in the operation of the transfer case, so that the cleanliness of the lubricating oil is improved. Through reducing the temperature of the lubricating oil and forced lubrication, and filtering impurities in the lubricating oil, the transmission of gears and bearings can be more reliable, faults caused by unsmooth lubrication, higher temperature and the like are reduced, the reliability of the sugarcane harvester is guaranteed, and the loss caused by faults is reduced.

The transfer case of the present utility model may employ various suitable types of lubricant pumps 6, such as gear pumps, vane pumps, etc. In order to be able to adjust the oil temperature in the tank 1 according to different operating conditions, the lubricant pump 6 may be provided as a variable pump integrated with an electromagnetic control valve, while a temperature sensor for detecting the oil temperature of the lubricant is provided on the tank 1 or the circulation oil path, and the electromagnetic control valve controls the displacement of the variable pump according to the oil temperature detected by the temperature sensor. Therefore, when the environment temperature is low and the working load is small, the oil temperature of the lubricating oil is low, the lubricating oil pump 6 can work with small displacement, and the lubricating oil is forcedly sprayed to a lubricating part to mainly play a role in lubrication; when the ambient temperature is higher, when the work load is great, lubricating oil easily has higher oil temperature, and electromagnetic control valve control is for making the discharge capacity of lubricating oil pump 6 rise, and a large amount of lubricating oil is pumped into through the heat dissipation unit heat dissipation, and then provides the lubricating oil after the heat dissipation cooling in the box 1, still plays the cooling effect to relevant part in playing the lubrication effect, reduces the risk that the part damaged and became invalid.

The transfer case may be provided with at least two sets of driven gears and driven shafts, such as two sets, three sets, four sets, etc., as needed for power distribution. Since the driven gears 4 of each group are uniformly distributed around the circumference of the driving gear 2, under normal operating conditions, the power transmitted by the driving gear 2 is uniformly distributed to each driven gear 4, the loads borne by each part of the driving gear 2 in the circumferential direction and each driven gear 4 are substantially equivalent, and the radial impacts borne by the power pumps 18 connected to each driven shaft 5 cancel each other. However, when a gear transmission failure occurs in a particular situation such as tooth face wear or gear breakage, a corresponding impact is generated on the gear (particularly the drive gear 2). The transfer case of the present utility model preferably has four driven gears 4, which can have relatively little impact in the event of failure of one of the sets of meshed gears, as compared to the other number of driven gears, without significantly increasing the difficulty of the gear arrangement.

Further, in the case where four driven gears 4 are arranged, the centers of any adjacent two driven gears 4 may be located in the same horizontal plane or the same vertical plane, that is, the line connecting the centers of any adjacent two driven gears 4 extends in the horizontal direction or the vertical direction. With this arrangement, the motor case can be made to have a relatively small height dimension, and can be stably mounted on the vehicle body.

In a preferred embodiment, the driving gear 2 and the driven gear 4 may be helical gears, respectively, wherein the driving gear 2 is integrally formed with the driving shaft 3 and the driven gear 4 is integrally formed with the driven shaft 5. Through the arrangement, the strength of the transmission structure can be enhanced, the assembly workload of parts is reduced, the bearing clearance is well ensured, and the service life of the gear box is prolonged. As one of the key core components of the power output, once the transfer case has transmission failure, the whole vehicle cannot work. The problems of key abrasion, broken shaft, gear shake, abnormal transmission noise and the like are avoided, the size chain error is reduced, the bearing clearance is better ensured, and the transfer case has the advantages of reliable and stable transmission, convenience in assembly and the like.

The bevel gear has the problem of inconvenient disassembly, and to this end, a threaded hole 4a can be formed on the end face of the second side of the driving gear 2 and the driven gear 4, which faces the box body 1, so that the later disassembly is convenient.

Two slings 16 diagonally arranged may be provided on the transfer case body 1 in order to smoothly hoist the transfer case and carry out the mounting process. The bottom end of the tank 1 may be provided with an oil drain port to drain the lubricant inside the tank 1 by removing the drain plug 17 connected to the oil drain port at the time of replacement or maintenance.

In a preferred embodiment, the bottom of the tank 1 may be detachably connected with a lubrication oil filling pipe 10, which lubrication oil filling pipe 10 is arranged to be at least partly transparent to allow the level of lubrication oil in the tank 1 to be observed through the transparent part. In the illustrated preferred embodiment, the lubricant filler pipe 10 is connected to an oil drain port at the bottom of the tank 1 by a hinge bolt 11, and a plug 13 is installed at an end remote from the oil drain port, thereby constituting the lubricant filler pipe 10 integrating remote oil drain, oil filling, and liquid level observation. Gear oil can be filled by opening the plug 13; the fixing clamp 12 is disassembled, and the drain of lubricating oil can be realized by opening the plug 13 without disassembling a lower cover plate of the transfer case. The lubricating oil filling pipe 10 can be a flexible pipe which is fixed at a position close to a vehicle door by using the fixing frame 12, so that the fixing position can be flexibly adjusted, and the daily observation and maintenance of the liquid level are convenient.

The utility model also provides an agricultural machine, such as a sugarcane harvester, comprising the transfer case or the power assembly.

The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited thereto. Within the scope of the technical idea of the utility model, a number of simple variants of the technical solution of the utility model are possible, including combinations of individual specific technical features in any suitable way. The various possible combinations of the utility model are not described in detail in order to avoid unnecessary repetition. Such simple variations and combinations are likewise to be regarded as being within the scope of the present disclosure.

Claims (10)

1. The utility model provides a transfer case, includes box (1) and respectively rotatably install driving gear (2) in this box (1) and with this driving gear (2) meshing and encircle a plurality of driven gears (4) of this driving gear (2) equipartition, characterized in that, driving gear (2) set up on driving shaft (3), this driving shaft (3) can be in first side transmission connection of box (1) is to the power supply, install on the second side opposite to first side of box (1) with driving shaft (3) coaxial arrangement and transmission are connected to lubricating oil pump (6) of this driving shaft (3), the oil suction mouth of this lubricating oil pump (6) communicate to the inner chamber of box (1), the oil discharge mouth communicates to the lubrication position in this box (1), in order to when driving shaft (3) pass through driving gear (2) drive driven gear (4) rotate, this driving shaft (3) still drives lubricating oil pump (6) will in box (1) to the lubrication position of forcing.

2. Transfer case according to claim 1, characterized in that it comprises four driven gears (4) evenly distributed around the circumference of the driving gear (2), and in that the centers of any adjacent two driven gears (4) are located in the same horizontal plane or in the same vertical plane.

3. Transfer case according to claim 1, characterized in that the driving gear (2) and the driven gear (4) are respectively helical gears, wherein the driving gear (2) is integrally formed with the driving shaft (3).

4. Transfer case according to claim 1, characterized in that the pump housing of the lubricant pump (6) is detachably connected to the case (1), and that a threaded hole (4 a) is formed on the end face of the driving gear (2) and/or the driven gear (4) facing the second side of the case (1).

5. Transfer case according to claim 1, characterized in that the oil suction port of the lubricant pump (6) is connected to the inner cavity of the case (1) by means of an oil suction line (7), which oil suction line (7) is connected to the bottom of the case (1); the oil drain port of the lubricating oil pump (6) is communicated to the lubricating part of the box body (1) through an oil drain pipeline (8), the oil drain pipeline (8) is connected to the top of the box body (1), and a heat radiating unit is arranged on an oil path between the oil drain port of the lubricating oil pump (6) and the box body (1).

6. Transfer case according to claim 5, characterized in that the heat dissipating unit is located above the case (1) and/or in that the heat dissipating unit is a helically extending heat dissipating copper tube (9).

7. Transfer case according to claim 1, characterized in that the lubricant pump (6) is provided as a variable pump integrated with an electromagnetic control valve, which transfer case is further provided with a temperature sensor for detecting the oil temperature of the lubricant, which electromagnetic control valve is capable of controlling the displacement of the variable pump in dependence on the oil temperature detected by the temperature sensor.

8. Transfer case according to claim 1, characterized in that the bottom of the case (1) is detachably connected with a lube oil filling pipe (10), which lube oil filling pipe (10) is arranged to be at least partly transparent to allow the level of lube oil in the case (1) to be observed through the transparent part.

9. A powertrain comprising an engine (200) and a transfer case (100) according to any one of claims 1 to 8, the drive shaft (3) of the transfer case (100) being drivingly connected to the power take-off of the engine (200), the driven gears (4) being drivingly connected to power pumps (18) respectively, the lubrication pump (6) being located in a space surrounded by a plurality of the power pumps (18).

10. An agricultural machine, characterized in that it comprises a transfer case (100) according to any one of claims 1 to 8 or a powertrain according to claim 9.