JPH05288024A - Oil pump body of internal combustion engine - Google Patents

Abstract

PURPOSE:To provide the oil pump body of an internal combustion engine of which quality control is easily performed and productivity is improved. CONSTITUTION:Rotors 3, 4 are internally mounted in an oil pump body 1, an oil filter 6 and an oil pressure sensor 7 are fitted to the body, and they are unitized. The oil pump body 1 is provided with a pump discharge side through hole 23 to lead lubricating oil discharged from the rotors 3, 4 to the oil filter 6, and a filter outlet side through hole 26 to lead the lubricating oil passing through the oil filter 6 that are formed therein. The filter outlet side through hole 26 is communicated to the oil passage on the engine main body side, and a supply side through hole 27 to which the oil pressure sensor 7 is fitted is formed on the opening end.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an oil pump body of an internal combustion engine.

[0002]

2. Description of the Related Art In an internal combustion engine in which an oil pump body for housing a rotor driven by a crankshaft to pump lubricating oil is formed separately from the engine body, various parts are attached to the oil pump body. , The number of processing steps for the engine body and the number of parts attached thereto are being reduced.

Conventionally, for example, Japanese Utility Model Laid-Open No. 64-13205 discloses an oil pump body having a mounting seat for an oil filter. In addition, JP-A-6
Japanese Patent Laid-Open No. 3-259243 discloses that a bearing that supports a balancer shaft that cancels engine vibration is formed integrally with an oil pump body.

[0004]

However, in such a conventional apparatus, in the engine provided with the oil pressure sensor for detecting the lubricating oil pressure, the oil pressure sensor is provided facing the oil passage of the engine body. In order to inspect the pressure characteristics of the lubricating oil discharged from the oil pump at the time of engine manufacture, the operating characteristics of the pressure regulator, etc. using the output of this oil pressure sensor, it is necessary to assemble the oil pump body into the engine body, These made quality control difficult.

It is an object of the present invention to provide an oil pump body for an internal combustion engine, focusing on the above-mentioned problems and facilitating quality control and enhancing productivity.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a lubricating oil is filtered in an oil pump body of an internal combustion engine in which a rotor, which is formed separately from the engine body and is driven by a crankshaft to pump the lubricating oil, is housed. Mounting seat for the oil filter, a pump discharge side through hole that guides the lubricating oil sent from the rotor to the oil filter, a filter outlet side through hole that guides the lubricating oil that has passed through the oil filter, and a filter outlet side through hole And an oil passage on the engine main body side, and a supply-side through hole to which an oil pressure sensor for detecting the lubricating oil pressure is attached is provided at the opening end thereof.

Further, in an internal combustion engine provided with a balancer shaft arranged in parallel with the crankshaft, a timing belt for transmitting the rotation of the crankshaft to the balancer shaft, and a tensioner pulley rollingly contacting the timing belt to maintain its tension. Therefore, a bearing hole for penetrating the balancer shaft and a mounting seat for the tensioner pulley are integrally formed in the oil pump body.

[0008]

According to the above structure, the oil pump body can be unitized by attaching the oil filter and the pressure sensor in addition to the rotor and the pressure regulator. As a result, at the sub-assembly stage before the oil pump body is assembled to the engine body, the test device is used to drive the rotor and read the detection signal from the oil pressure sensor to determine the pressure characteristics of the lubricating oil discharged from the rotor. In addition, it is possible to inspect the operating characteristics of the pressure regulator, and it is possible to confirm whether or not there is a lubricating oil leak in the oil passage system that is guided from the rotor through the oil filter, so that quality control of these can be performed easily. .. Even after the oil pump body is assembled to the engine body, the oil pressure in the supply-side through hole is detected by the oil pressure sensor during engine operation.

The supply-side through hole formed in the oil pump body has a function of sending the lubricating oil after passing through the oil filter to the engine body through the filter outlet-side through hole, and an oil pressure sensor attached to the opening end of the oil. It plays the role of guiding the detected hydraulic pressure generated on the downstream side of the filter. As a result, the number of through holes formed in the oil pump body is minimized, and the structure is simplified.

Further, by integrally forming a bearing hole for penetrating the balancer shaft in the oil pump body and a mounting seat for the tensioner pulley, it is possible to reduce the processing man-hours of the engine body and the number of parts to be mounted on the engine body. ,
You can increase productivity.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, an oil pump body 1 provided separately from the engine body is joined to a flange portion 11 for joining the engine body at its rear portion and a front cover for defining a belt chamber at its front portion. And a flange portion 12.

A trochoidal type oil pump is housed in the oil pump body 1. The oil pump includes an inner rotor 3 connected to the crankshaft 2 and an outer rotor 4 located outside the inner rotor 3 and eccentrically engaged with each other. Pump lubricating oil.

An oil strainer 5 for sucking up the lubricating oil stored in the oil pan is attached to the lower portion of the oil pump body 1. The lubricating oil sucked up through the oil strainer 5 is transferred from the pump suction chamber 21 of the oil pump body 1 to the rotors 3, 4 as shown by the broken line arrows in the figure.
The pump discharge chamber 22 is sucked in between the rotors 3 and 4.
Is sent to.

The oil pump body 1 is integrally formed with an annular mounting seat 13 for joining the outer peripheral end of the cartridge type oil filter 6. In the oil pump body 1, a filter outlet side through hole 26 is formed in the center of the inside of the mounting seat 13, and a hollow stud bolt 14 is screwed into an inner peripheral thread portion of the filter outlet side through hole 26. The hollow stud bolt 14 is screwed and attached to the outer peripheral threaded portion. The filter outlet side through hole 26 is formed by drilling.

The mounting seat 13 for the oil filter 6 is formed obliquely downward, and the oil filter 6 attached to the mounting seat 13 projects laterally of the engine to facilitate the replacement work of the oil filter 6.

As shown in FIG. 3, the mounting seat 13 for the oil filter 6 is connected to the engine body by the flange portion 1.
1, the oil filter 6 is formed so as to project rearward and does not increase the front-rear length of the engine with the oil filter 6 attached thereto.

As shown in FIGS. 5 and 6, a filter inlet chamber 24 is formed in the oil pump body 1 between the mounting seat 13 and the stud bolt 14, and the filter inlet chamber 24 has a pump discharge side through hole 23. Through the pump discharge chamber 22. The pump discharge side through hole 23 is formed by drilling. In FIG. 5, reference numeral 17 denotes a back plate attached to the rear portion of the oil pump body 1. Between the back plate 17 and the oil pump body 1, each rotor 3,
4 is accommodated, and a pump suction chamber 21 and a pump discharge chamber 22 are defined.

The lubricating oil sent out from between the rotors 3 and 4 to the pump discharge chamber 22 passes through the pump discharge side through hole 23 and the filter inlet chamber 24 as shown by the broken line arrow in FIG.
Through an outer chamber 31 defined outside the element 32 of the oil filter 6, from this outer chamber 31 through the element 32 into an inner chamber 33 defined inside the element 32, The foreign matter contained in the lubricating oil is removed by 32.

As shown also in FIG. 4, the oil pump body 1 is formed with a supply-side through hole 27 that connects the filter outlet-side through hole 26 and the engine body-side oil passage. One end of the supply-side through hole 27 opens into a joint flange 29 for the engine body through the through hole 28. The joint groove 29 has an annular groove 3
0 is formed, and the oil passage defined between the engine body and the oil pump body 1 is sealed by the sealing material interposed in the annular groove 30.

The supply-side through hole 27 is formed by drilling, a screw portion 35 is formed at the open end thereof, and the pressure sensor 7 screwed into the screw portion 35 is provided. During engine operation, the pressure sensor 7 detects the oil pressure in the supply-side through hole 27, and the detection signal is sent to the control circuit. The control circuit determines an abnormal time when the detected oil pressure falls below a predetermined value, and at the time of abnormal operation A warning light is turned on to perform a fail-safe function to inform the driver of this.

The oil pump body 1 is formed with a bypass through hole 36 for short-circuiting the filter inlet chamber 24 and the supply side through hole 27, and a relief valve 37 is interposed in the bypass through hole 36. When the oil pressure in the filter inlet chamber 24 increases beyond a predetermined value due to clogging of the element 32 of the oil filter 6 or the like, the relief valve 37 compresses the relief spring 38 to open the valve, and the lubricating oil is removed from the oil filter 6 Is bypassed and guided to the supply-side through hole 27.

A mounting seat 15 for the pressure regulator 8 is integrally formed on the lower portion of the oil pump body 1. The pressure regulator 8 has a pump discharge chamber 22.
And a relief valve that opens and closes a passage that connects the oil pan to each other, and a relief spring that presses the passage against the valve seat. When the hydraulic pressure in the pump discharge chamber 22 is low, the relief valve is seated on the valve seat by the urging force of the relief spring. Then, when the oil pressure in the pump discharge chamber 22 rises above a predetermined value, the relief valve compresses the relief spring and separates it from the valve seat, returning a part of the lubricating oil discharged from the oil pump to the oil pan.

As shown in FIG. 2, two balancer shafts 9 are provided to reduce engine vibration. Each balancer shaft 9 is arranged parallel to the crankshaft 2, and the rotational force of the crankshaft 2 is transmitted via the pulley 16, the tensioner pulley 10, a timing belt wound around the tensioner pulley 10, and the like. As the timing belt, one having teeth on both inner and outer circumferences is used, one balancer shaft 9 meshes with inner teeth of the timing belt, and the other balancer shaft 9 meshes with outer teeth of the timing belt. Rotate in opposite directions. Each balancer shaft 9 cancels the inertial force of the piston and the crankshaft 2 by the inertial force given by each unbalanced mass.

The oil pump body 1 is integrally formed with a bearing hole 41 for penetrating the crankshaft 2 and two bearing holes 42, 43 for penetrating the balancer shafts 9. A seal member 44 is interposed between the bearing holes 41, 42, 43 and the shafts 2, 9 and seals the respective joints to define a belt chamber defined between the oil pump body 1 and the front cover. The lubricating oil does not leak out.

The oil pump body 1 is integrally formed with a mounting seat 45 for the tensioner pulley 10. The tensioner pulley 10 is rotatably supported by a boss 47 via a bearing 46, and the boss 47 is slidably joined to a mounting seat 45 of the oil pump body 1. The oil pump body 1 is provided with a stud bolt 48 that is screwed into the engine body.
Holes 49 and 51 through which the stud bolt 48 penetrates are formed in the and boss 47, respectively, and both are fastened together to the engine body via a nut 52 screwed to the tip of the stud bolt 48.

A boss 47 through which the stud bolt 48 penetrates
51 is formed eccentrically with respect to the center of rotation of the tensioner pulley 10, and the boss 47 rotates in a predetermined direction with respect to the stud bolt 48, so that the tensioner pulley 10 is pressed against the timing belt and the tension of the timing belt is appropriate. Kept in.

A winding spring 52 is fitted on the outer periphery of the boss 47. One end of the winding spring 52 is inserted into a hole opened on the outer peripheral surface of the boss 47, and the other end is inserted into a hole 53 formed in the oil pump body 1. When the boss 47 is inserted, the urging force of the winding spring 52 acts in the rotation direction of the boss 47.

The balancer shafts 9 are arranged on the left and right sides with the crankshaft 2 interposed therebetween, and are provided above the crankshaft 2 at different heights. A bearing hole 43 that penetrates one balancer shaft 9 is formed between the pump discharge side through hole 23 and the supply side through hole 27, and a mounting seat 45 for the tensioner pulley 10 is formed above the supply side through hole 27.

Next, the operation will be described.

In addition to mounting the rotors 3 and 4 on the oil pump body 1, the pressure regulator 8, the oil filter 6 and the pressure sensor 7 are attached to form a unit. As a result, at the stage of the sub-assembly before the oil pump body 1 is assembled to the engine body, the rotors 3 and 4 are read by using the test device to drive the rotors 3 and 4, and the detection signals from the hydraulic pressure sensor 7 are read. In addition to being able to inspect the pressure characteristics of the lubricating oil sent out and the operating characteristics of the pressure regulator 8,
It is possible to confirm whether or not a lubricating oil leak occurs in the oil passage system guided from the rotors 2 and 3 through the pressure regulator 8 and the oil filter 6, and the quality control of these can be easily performed.

As described above, the pressure sensor 7 detects the oil pressure in the supply-side through hole 27 even during engine operation, and the warning lamp is turned on when the detected oil pressure falls below a predetermined value via the control circuit. As a result, it performs a fail-safe function to inform the driver of this.

The pump discharge side through hole 23, the filter outlet side through hole 26, and the supply side through hole 27 are formed by drilling, respectively. At the open ends of the pump discharge side through hole 23 and the filter outlet side through hole 26, respectively. Due to the structure in which the oil filter 6 is provided and the pressure sensor 7 is provided at the opening end of the supply-side through hole 27, a blind plug that closes the through holes 23, 26, 27 is not required, and the number of parts can be reduced.

The supply side through hole 27 has a function of sending the lubricating oil after passing through the oil filter 6 to the oil passage on the engine main body side through the filter outlet side through hole 26, and a hydraulic sensor attached to the opening end thereof. The function of guiding the detected hydraulic pressure to 7 is fulfilled.
As a result, the number of through holes formed in the oil pump body 1 can be minimized and the oil passage structure can be simplified.

Further, by integrally forming the bearing holes 42, 43 for penetrating the balancer shafts 9 in the oil pump body 1 and the mounting seat 45 for the tensioner pulley 10, the number of machining steps of the engine main body and the mounting process for the engine main body are performed. You can increase the productivity by reducing the number of parts required.

[0036]

As described above, according to the present invention, in the oil pump body of the internal combustion engine in which the rotor that is formed separately from the engine body and that is driven by the crankshaft to pump the lubricating oil is housed, A mounting seat for an oil filter for filtering, a pump discharge side through hole for guiding the lubricating oil sent from the rotor to the oil filter, and a filter outlet side through hole for guiding the lubricating oil that has passed through the oil filter,
Since the filter outlet side through hole is connected to the engine body side oil passage and the supply side through hole to which the oil pressure sensor for detecting the lubricating oil pressure is attached is provided at the opening end, the oil pump body is assembled to the engine body. At the previous sub-assembly stage, the oil pressure sensor attached to the oil pump body can be used to inspect the pressure characteristics of the lubricating oil discharged from the rotor, the operating characteristics of the pressure regulator, etc. Can be done easily.

Further, since the bearing hole for penetrating the balancer shaft and the mounting seat for the tensioner pulley are integrally formed in the oil pump body, the number of machining steps of the engine body and the number of parts mounted on the engine body are reduced. , Productivity can be increased.

[Brief description of drawings]

FIG. 1 is a front view of a pump body showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view taken along line AA of FIG.

FIG. 3 is a view of the same as seen from the direction of arrow B in FIG.

FIG. 4 is a sectional view taken along the line CC of FIG.

5 is a sectional view taken along the line D-D of FIG. 1.

6 is a view of the same as seen from the direction of arrow E in FIG. 1. FIG.

[Explanation of symbols]

 1 Pump Body 2 Crank Shaft 3 Inner Rotor 4 Outer Rotor 6 Oil Filter 7 Oil Pressure Sensor 8 Pressure Regulator 9 Balancer Shaft 10 Tensioner Pulley 13 Oil Filter Mounting Seat 15 Pressure Regulator Mounting Seat 23 Pump Discharge Side Through Hole 26 Filter Outlet Through Hole 27 Supply side through hole 42 Bearing hole 43 Bearing hole 45 Tensioner pulley mounting seat

Claims (2)

[Claims] 1. An oil pump body of an internal combustion engine, which is formed separately from an engine body and which houses a rotor driven by a crankshaft to pump lubricating oil, and a mounting seat for an oil filter for filtering lubricating oil, A pump discharge side through hole that guides the lubricating oil discharged from the rotor to an oil filter, a filter outlet side through hole that guides the lubricating oil that has passed through the oil filter, and a filter outlet side through hole and an oil passage on the engine body side. An oil pump body for an internal combustion engine, comprising: a supply-side through hole to which a hydraulic pressure sensor for detecting a lubricating hydraulic pressure is attached. 2. An internal combustion engine comprising: a balancer shaft arranged in parallel with the crankshaft; a timing belt for transmitting the rotation of the crankshaft to the balancer shaft; and a tensioner pulley for rolling the timing belt to maintain its tension. The oil pump body for an internal combustion engine according to claim 1, further comprising: a bearing hole for penetrating the balancer shaft, and a mounting seat for the tensioner pulley.