JP4116318B2 - Oil pump lubrication system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lubrication device for an oil pump that lubricates a gear shaft portion of a gear pump using oil leak from an oil discharge port.
[0002]
[Prior art]
Conventionally, this type of gear pump has a drive gear and a driven gear meshed with each other inside the pump casing, and the drive shaft of the drive gear passes through the pump casing and is connected to the rotary drive source. By rotating the drive gear and the driven gear via this drive gear by the rotational force from the oil, the oil sucked from the oil suction port is conveyed to the oil discharge port side and discharged at a high pressure.
[0003]
At that time, in order to avoid the deterioration of the oil by mixing different kinds of lubricating oil, the gear pump projecting from both end faces of the pair of gears engaged with each other is made by the oil itself to be transported by the gear pump. In many cases, a so-called self-lubricating method is employed.
[0004]
For example, in Japanese Patent No. 2844216 or Japanese Utility Model Publication No. 6-19832, an introduction passage is provided between a gear shaft portion protruding from a pair of gears meshing with each other and a bush supporting the gear shaft portion. A technique is disclosed in which a part of the oil sucked from the suction port of the gear pump is introduced into the introduction passage, and the periphery of the gear shaft portion is lubricated by the oil flowing through the introduction passage.
[0005]
[Problems to be solved by the invention]
However, all of the techniques disclosed in the above publications take in oil from the suction port side and lubricate the periphery of the gear shaft of the gear pump. It is necessary to form a passage that circulates to the side to prevent overflow of the oil that has been taken in, resulting in inconvenience that the structure of the introduction passage is complicated and the product cost increases.
[0006]
Further, since the introduction passage is formed in the gear pump, the existing gear pump cannot be used, and the gear pump becomes a custom-made product, and there is a problem of lack of versatility.
[0007]
In view of the above circumstances, the present invention enables self-lubricating to guide oil to the periphery of a gear shaft portion using an existing gear pump with a simple structure, thereby reducing product cost, increasing versatility, and improving maintainability. An object of the present invention is to provide an oil pump lubrication device capable of realizing the above.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention includes a pump casing that houses a pair of gears that rotate in mesh with each other and supports gear shafts that project from both side surfaces of each gear, and a pump casing on one side of the pump casing. A gear pump having an oil suction port and an oil discharge port that are opened, and one side surface of the pump casing in which the oil suction port and the oil discharge port are opened are connected to the oil suction port and the oil discharge port. An oil pump lubrication device attached to an oil supply unit having a pump mating surface in which an oil outlet and an oil inlet communicating with each other are opened, wherein the gear shaft projects from the pair of gears on one side of the pump casing Through the bearing hole that supports the section and at the position facing the bearing hole on the pump mating surface. Forming a reservoir, to the oil inlet of the outer periphery of the pump mating surface to form an oil collection groove, characterized in that communication between the above oil collecting groove and the oil sump via the leakage groove.
[0009]
In such a configuration, when a gear pump is attached to the pump mating surface, the oil collecting groove, oil reservoir, and leak groove opening surfaces formed on the pump mating surface are closed by the gear pump. The oil leak from the pump mating surface that occurs when oil flows from the oil discharge port of the gear pump to the oil inlet of the hydraulic control valve unit is collected in an oil collecting groove formed on the outer periphery of the oil inlet. The oil collected in the oil collecting groove is guided to the oil reservoir through the leak groove, and the oil flowing into the oil reservoir is self-lubricated around the gear shaft provided in the gear pump.
[0010]
In this case, the oil supply unit is a hydraulic control valve unit of an automatic transmission, and the gear pump is directly attached to the pump mating surface of the hydraulic control valve unit.
[0011]
With this configuration, the lubricating oil in the gear shaft portion is secured by oil leakage from the pump mating surface that occurs when oil flows from the oil discharge port of the gear pump to the oil inlet of the hydraulic control valve unit.
[0012]
Further, the oil reservoir formed on the pump mating surface of the oil supply unit, the oil collecting groove, and the leak groove communicating with the oil reservoir and the oil collecting groove are formed by casting. Features.
[0013]
With this configuration, the pump supply surface of the oil supply unit only needs to be chamfered and a mounting hole for mounting the gear pump, and a lubrication configuration can be established simply by directly attaching the gear pump to this pump connection surface.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an overall configuration diagram of a continuously variable transmission.
[0015]
Reference numeral 1 in FIG. 1 denotes an engine, and an output shaft 2 of the engine 1 supports a drive wheel 5 via a continuously variable transmission unit 3 and a final reduction unit 4 that constitute a continuously variable transmission which is an example of a transmission. It is connected to the drive shaft 6. The continuously variable transmission unit 3 includes a torque converter 7, a forward / reverse switching device 8, and a continuously variable transmission 9 from the input side. The output shaft 2 of the engine 1 is connected to the impeller 7 a of the torque converter 7. A turbine 7 b of the torque converter 7 is connected to the planetary input shaft 8 a of the forward / reverse switching device 8.
[0016]
The forward / reverse switching device 8 is equipped with a planetary gear 10 and is in a neutral state when both the forward clutch 11 and the reverse brake 12 are in an open state. Further, when only the forward clutch 11 is engaged, the planetary gear 10 rotates integrally, and the power from the turbine 7b of the torque converter 7 is transmitted to the continuously variable transmission 9 as it is.
[0017]
On the other hand, when the forward clutch 11 is released and the reverse brake 12 is engaged, the power from the turbine 7b of the torque converter 7 is transmitted to the continuously variable transmission 9 via the planetary gear 10 while being reversed.
[0018]
Further, a primary pulley 9b is attached to the primary input shaft 9a of the continuously variable transmission 9, and a secondary pulley 9c opposite to the primary pulley 9b is attached to the secondary output shaft 14, and is driven by both pulleys 9b and 9c. A belt 9e is wound. A primary hydraulic chamber 9f and a secondary hydraulic chamber 9g are provided on the movable sheave side of each pulley 9b, 9c, and the groove width of both pulleys 9b, 9c is inversely proportional to the operating pressure supplied to each hydraulic chamber 9f, 9g. Shift control is performed in the state.
[0019]
Further, the secondary output shaft 14 is connected to the differential device 4 b that is attached to the drive shaft 6 via the reduction gear train 4 a of the final reduction gear 4.
[0020]
Further, as shown in FIG. 2, the oil pan 20 provided at the bottom of the transmission is used as an oil supply unit for controlling the hydraulic pressure required for the transmission ratio control, transmission torque control, etc. of the continuously variable transmission unit 3. A hydraulic control valve unit 21 is provided. The hydraulic control valve unit 21 controls the supply pressure of oil and the discharge pressure from the gear pump 22 as a base pressure. The gear pump 22 is connected to a pump mating surface 21 a formed on one side of the hydraulic control valve unit 21. Mounted.
[0021]
As shown in FIGS. 4 and 7, the pump casing 23 of the gear pump 22 includes a main body portion 23a, a front cover 23b and a rear cover 23c that close both sides of the main body portion 23a, and the main body portion 23a. A pair of drive gear 24 and driven gear 25 that mesh with each other is housed, and gear shaft portions 24a and 25a projecting from both side surfaces of the gears 24 and 25 are formed in the covers 23b and 23c. The bearing hole 26 is rotatably supported via a bush 27.
[0022]
As shown in FIG. 2, each bearing hole 26 is penetrated, and a gear shaft portion 24a inserted through the bearing hole 26 opened in the front cover 23b is projected outward, and a driven sprocket is formed at the tip thereof. 28 is axially attached. Since the gear pump 22 is accommodated in the oil pan 20, even if the bearing hole 26 is penetrated, dust, dust, etc. do not enter the bearing hole 26 from the outside.
[0023]
Further, a drive sprocket 30 connected to the driven sprocket 28 via a chain 29 is disposed between the forward / reverse switching device 8 and the torque converter 7 and is attached to the sleeve from the impeller 7 a of the torque converter 7. It is worn. An oil suction port 31a and an oil discharge port 31b are opened in the back cover 23c of the pump casing 23.
[0024]
An oil flow that communicates with an oil suction port 31a and an oil discharge port 31b that are opened in the back cover 23c is connected to a pump mating surface 21a formed in the hydraulic control valve unit 21 to which the back cover 23c is closely fixed. An outlet 32a and an oil inlet 32b are opened.
[0025]
When the gear pump 22 is driven, the oil is sucked into the oil suction port 31a of the gear pump 22 from the oil outlet 32a opened in the hydraulic control valve unit 21, and the sucked oil is conveyed to the oil discharge port 31b. The oil is discharged from the oil discharge port 31b to the oil inlet 32b of the hydraulic control valve unit 21.
[0026]
As shown in FIGS. 6 and 8, an oil collecting groove 33a (a portion indicated by hatching in FIG. 6) is formed on the outer periphery of the oil inlet 32b opened in the pump mating surface 21a of the hydraulic control valve unit 21. A ring groove 33b is formed on the outer periphery of the oil outlet 32a. A seal ring (not shown) such as an O-ring is attached to the ring groove 33b.
[0027]
Further, a pair of oil reservoirs 21b and 21c are formed on the pump mating surface 21a. The oil reservoirs 21b and 21c are disposed at positions where the bearing hole 26 formed in the back cover 23c of the gear pump 22 and the gear shaft parts 24a and 25a supported by the bearing hole 26 are opposed to each other. A rib portion 21d is formed between the oil reservoir portions 21b and 21c.
[0028]
The rib portion 21d is formed at a position deeper than the oil collecting groove 33a and shallower than the oil reservoir portions 21b and 21c. Further, the oil collecting groove 33a communicates with the oil reservoirs 21b and 21c via the leak groove 34 in the rib portion 21d, and the oil leaked from the oil inlet 32b to the oil collecting groove 33a is passed through the leak groove 34. After that, the oil is distributed from the rib portion 21d to both the oil reservoirs 21b and 21c and stays in both the oil reservoirs 21b and 21c.
[0029]
The hydraulic control valve unit 21 is a cast product using die casting or the like, and both oil pool grooves 21b and 21c, a rib portion 21d, an oil collecting groove 33a, a ring groove 33b, and a leak groove formed on the pump mating surface 21. 34 is integrally formed at the time of casting.
[0030]
As shown in FIG. 3, the hydraulic control valve unit 21 is provided with a pressure regulator valve 35a and a shift control valve 35b. The oil discharge port 31b of the gear pump 22 is connected to the line pressure by both the valves 35a and 35b. They are connected via an oil passage 37.
[0031]
In the pressure regulator valve 35a, the discharge pressure from the gear pump 22 is used as a source pressure to generate a line pressure corresponding to the gear ratio and the engine torque, and this line pressure is supplied as a secondary pressure to the secondary hydraulic chamber 9g.
[0032]
Further, in the shift control valve 35b, the primary pressure is generated according to a preset shift pattern according to the traveling state, and the line pressure is generated as the original pressure, and is supplied to the primary hydraulic chamber 9f. Continuous gear ratio control is performed.
[0033]
Further, a lubricating oil passage 39 is connected to the pressure regulator valve 35a, and the lubricating oil passage 39 is extended to a necessary lubricating portion such as the drive belt 9e through a lubricating valve 41 that holds the inside of the lubricating oil passage 39 at a constant pressure. The necessary lubrication portion is lubricated by the oil supplied from the lubrication valve 41.
[0034]
Further, the lubricating oil passage 39 is communicated with the oil pan 20 via the check valve 42 and the oil cooler 43.
[0035]
Next, the operation of the present embodiment having such a configuration will be described. When the engine 1 is driven, the drive sprocket 30 connected to the impeller 7 a of the torque converter 7 rotates, and the rotational force is transmitted to the driven sprocket 28 via the chain 29.
[0036]
Since this driven sprocket 28 is mounted on a gear shaft portion 24 a that supports the drive gear 24 of the gear pump 22, the drive gear 24 rotates, and at the same time, a driven gear 25 that meshes with the drive gear 24 rotates. . Then, the oil is sucked from the oil suction port 31a, and the sucked oil is transported and discharged from the oil discharge port 31b in a state of being pressurized to a predetermined level.
[0037]
The oil discharged from the oil discharge port 31b passes through the oil inlet 32b opened in the hydraulic control valve unit 21, passes through the line pressure oil passage 37, and is supplied to the pressure regulator valve 35a, the shift control valve 35b, and the like. Is done. On the other hand, oil stored in the oil pan 20 is sucked into the oil suction port 31a of the gear pump 22 via an oil outlet 32a via an oil strainer (not shown) provided in the hydraulic control valve unit 21.
[0038]
Since the oil discharged from the oil discharge port 31b is high pressure, a part of the oil is discharged from the back cover 23c constituting the pump casing 23 and the pump mating surface 21a of the hydraulic control valve unit 21 to which the back cover 23c is closely fixed. Leak from between. The leaked oil is collected in an oil collecting groove 33a formed around an oil inlet 32b opened in the pump mating surface 21a, and the oil collected in the oil collecting groove 33a passes through the leak groove 34. Then, the oil is guided to the oil reservoirs 21b and 21c.
[0039]
Since the oil reservoirs 21b and 21c are provided with a bearing hole 26 opened in the back cover 23c constituting the pump casing 23, the bearing hole 26 and the gear shaft part exposed from the bearing hole 26 are provided. Oil that stays in the oil reservoirs 21b and 21c is supplied to the bush 27 interposed between 24a and 25a and lubricated.
[0040]
The oil overflowing from the oil reservoirs 21b and 21c is leaked from the groove on the pump mating surface 21a or the upper surface of the back cover 23c of the pump casing 23 and dropped onto the oil pan 20.
[0041]
As a result, the bush 27 can be self-lubricated by the oil sent out by the gear pump 22, so that there is no intrusion of different types of oil for lubrication, and it is possible not only to avoid alteration of the oil to be conveyed, but also the gear shaft portion 24 a. , 25a, it is not necessary to provide lubricating means for actively supplying oil, so that the structure is simplified and maintenance is facilitated.
[0042]
On the other hand, the bush 27 interposed between the bearing hole 26 opened in the front cover 23b and the gear shaft portions 24a and 25a is lubricated by the oil flowing around the opening. Therefore, since the bush 27 on the front cover 23b side is also self-lubricated, the maintainability is good.
[0043]
As described above, in the present embodiment, when the gear shaft portions 24a and 25a of the gear pump 22 are self-lubricated, the oil recovery groove 33a and the gear shaft portions 24a and 25a that recover oil leaking from the oil discharge port 31b of the gear pump 22 are collected. The oil reservoirs 21b and 21c for retaining the oil that lubricates the bush 27 that supports the oil and the leak groove 34 that communicates the oil recovery groove 33a with the oil reservoirs 21b and 21c are connected to the pump mating surface 21a on the hydraulic control valve unit 21 side. Since the pump casing 23 of the gear pump 22 is directly attached to the pump mating surface 21a of the hydraulic control valve 21, the oil reservoir grooves 21b and 21c, the rib portion 21d, the oil collecting groove 33a, and the leak groove 34 are opened. The surface is closed, the oil collecting groove 33a to the leak groove 34, Since the blanking portion 21d menstrual an oil reservoir groove 21b, lubricating structure for guiding the lubricating oil to 21c satisfied, it is easy to manufacture assembly.
[0044]
Further, since the gear pump 22 does not need to constitute a lubricating means in the gear shaft portions 24a and 25a, the product cost can be reduced and the versatility can be increased. On the other hand, by removing the gear pump 22, the pump mating surface 21 a can be easily exposed, so that maintainability is improved.
[0045]
Further, both oil reservoir grooves 21b and 21c, rib portion 21d, oil collecting groove 33a, ring groove 33b and leak groove 34 formed on the pump mating surface 21 of the hydraulic control valve unit 21 are formed by casting. Therefore, the pump mating surface 21a of the hydraulic control valve unit 21 only needs to be chamfered and a mounting hole for attaching the gear pump 22, and the lubricating device can be manufactured at low cost.
[0046]
【The invention's effect】
As described above, according to the present invention, it is possible to perform self-lubricating to guide oil to the periphery of the gear shaft portion with an existing gear pump with a simple structure, thereby reducing product cost, increasing versatility, and Excellent effects can be achieved, such as improvement in maintainability.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a power transmission system of a continuously variable transmission. FIG. 2 is a block diagram showing a main part of the continuously variable transmission. FIG. 3 is a circuit diagram of a main part of a hydraulic system of the continuously variable transmission. ] Perspective view of gear pump [FIG. 5] Side view of control valve unit [FIG. 6] Side view of control valve unit with gear pump removed [FIG. 7] VII-VII sectional view of FIG. VIII-VIII cross section [Explanation of symbols]
21 Hydraulic control valve unit (oil supply unit)
21a Pump mating surfaces 21b and 21c Oil reservoir 22 Gear pump 23 Pump casing 24 Drive gears 24a and 25a Gear shaft 25 Driven gear 26 Bearing hole 31a Oil intake port 31b Oil discharge port 32a Oil outlet 32b Oil inlet 33a Oil collecting groove 34 Leak groove

Claims (3)

A pump casing that houses a pair of gears that rotate in mesh with each other and supports gear shafts that project from both side surfaces of each gear; an oil suction port and an oil discharge port that open to one side of the pump casing; A gear pump having
A pump in which one side surface of the pump casing in which the oil suction port and the oil discharge port are opened has an oil outflow port and an oil inflow port communicating with the oil suction port and the oil discharge port In an oil pump lubrication device attached to an oil supply unit having a mating surface,
Penetrating a bearing hole that supports the gear shaft portion protruding from the pair of gears on one side surface of the pump casing;
An oil reservoir is formed at a position facing the bearing hole on the pump mating surface,
Forming an oil collecting groove on the outer periphery of the oil inlet of the pump mating surface;
A lubricating device for an oil pump, wherein the oil collecting groove and the oil reservoir are communicated with each other through a leak groove. 2. The oil pump lubrication device according to claim 1, wherein the oil supply unit is a hydraulic control valve unit of an automatic transmission, and the gear pump is directly attached to the pump mating surface of the hydraulic control valve unit. . The oil reservoir formed on the pump mating surface of the oil supply unit, the oil collecting groove, and the leak groove communicating the oil reservoir and the oil collecting groove are formed by casting. The oil pump lubrication device according to claim 1 or 2.

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