JPH0650048B2 - Oil filter mounting structure for internal combustion engine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an oil filter mounting structure for an internal combustion engine for mounting an oil filter for an internal combustion engine on an outer surface of a crankcase.

(Prior Art) Conventionally, an oil filter mounting structure for an internal combustion engine, in which an oil filter is mounted on a crankcase of an internal combustion engine via an adapter by a single rod-shaped mounting member that passes through the centers thereof, is disclosed in It is known from Japanese Patent Publication No. 57-136414.

(Problems to be Solved by the Invention) In such a conventional oil filter mounting structure, since the joint surface between the rod-shaped mounting member and the adapter is small, the mounting dimensional accuracy between the adapter and the rod-shaped mounting member is low. Oil leaks easily occur.

Further, if the axial length of the filter element is increased to increase the area of the filter element, the axial length of the rod-shaped mounting member also increases, and the projection length from the crankcase also increases, which is an obstacle to downsizing the entire engine. There was a problem that

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent the occurrence of oil leakage and to increase the area of the oil element, while shortening the protrusion length from the crankcase. An object of the present invention is to provide an oil filter mounting structure for an internal combustion engine, which is capable of achieving compactness of the entire engine.

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, an oil filter is mounted on a crankcase of an internal combustion engine via an adapter by a single rod-shaped mounting member positioned on the centerline thereof. In the oil filter mounting structure of the internal combustion engine,
The rod-shaped mounting member has a positioning function for the adapter by being screwed and fixed to the crankcase and fitted into a fitting hole at the center of a boss portion provided at the center of the adapter, A spigot-shaped recess for accommodating the boss is provided at the center of an end plate disposed at one end of a filter element of the oil filter, and an oil flow passage communicating with the oil filter is provided in the rod-shaped mounting member. It is characterized by that.

(Operation) The joint surface between the rod-shaped mounting member and the adapter is increased by the boss portion of the adapter, and the accuracy of the mounting dimension between the adapter and the rod-shaped mounting member is improved. Further, since the boss portion is housed in the recess, the dimension of the rod-shaped mounting member in the axial direction can be shortened while the filter element area can be sufficiently secured.
Further, since the oil filter and the adapter are fixed to the crankcase by a single common rod-shaped mounting member, a dedicated mounting member for fixing the adapter to the crankcase is unnecessary. Moreover, since the adapter is positioned by the rod-shaped mounting member, the positioning of the adapter is not uncertain. Furthermore, since the rod-shaped mounting member is screwed and fixed to the crankcase, there is little risk that the clean side and the dirty side of the oil in the oil filter are mixed.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a vertical sectional view of an internal combustion engine provided with an oil filter mounting structure of the present invention, in which 1 is an internal combustion engine,
A crankcase 3 is arranged below the cylinder block 2. The crankcase 3 includes an upper crankcase 3a and a lower crankcase 3b,
An oil pan 4 is attached to the lower portion of the lower crankcase 3b. An oil pump 5 is provided above the oil pan 4. The suction port 5a of the oil pump 5 is communicated with the oil pan 4 via a strainer 6. The discharge port 5b of the oil pump 5 is connected to the oil inlet of the oil filter 9 via the communication pipe 7 and the oil inflow passage 8a. The oil outlet of the oil filter 9 is communicated with each lubrication unit and an oil supply unit such as a hydraulic tappet via an oil outflow passage 8b.

The oil filter 9 includes a filter case 9a and a filter element 9b housed in the filter case 9a. The filter case 9a has a bottomed cylindrical shape with one end (the right end in the drawing) opening, and a fitting insertion hole 10 is formed in the center of the bottom wall. The filter body 9b has a cylindrical shape, and end plates 11 are provided at both ends thereof.
a and 11b are mounted, and fitting insertion holes 12a and 12b are formed in the central portions of these end plates 11a and 11b. Then, by inserting the rod-shaped mounting member 13 from the outer side of the bottom wall of the filter case 9a into the fitting insertion hole 10 at the center and the fitting insertion holes 12a, 12b at the center of the both end plates 11a, 11b, The filter elements 9b are mounted concentrically with each other in the filter case 9a.

The rod-shaped mounting member 13 has a collar 13a at one end and a hexagonal head 1
3b and a hollow bolt having an external thread 13c on the outer peripheral surface of the other end. Then, the collar 13a comes into contact with the outer surface of the bottom wall of the filter case 9a.

The oil filter 9 is attached to the adapter 14 by the rod-shaped mounting member 13 located on the center line of the oil filter 9.
It is attached to the outer side surface of the lower crankcase 3b through. The adapter 14 is a disk-shaped main body 14a.
A peripheral side wall 14b is provided on the outer periphery of the main body 14 and
A cylindrical boss portion 14c protruding toward the oil filter 9 is provided at the center of a. An end plate 11 having a spigot-shaped recess 11c for accommodating the boss 14c arranged at one end of the filter element 9b (end on the adapter 14 side).
It is provided at the center of b. Then, the rod-shaped mounting member 13 is inserted into the fitting hole at the center of the boss portion 14c of the adapter 14.
And the male screw 13c of the rod-shaped mounting member 13 is screwed into the screw hole 15 of the lower crankcase 3b, so that the oil filter 9 and the adapter 14 are combined into a single rod-shaped mounting member 13. The lower crankcase 3
It is attached to the outer surface of b. At the time of this attachment, the adapter 14 is positioned by the rod-shaped attachment member 13.
Further, in this attached state, the boss portion 14c of the adapter 14 is housed in the recess 11c of the end plate 11b at one end of the filter element 9b. A seal ring 16 is interposed between one end surface of the peripheral side wall 14b of the adapter 14 and the filter case 9a, and between the other end surface of the peripheral side wall 14b of the adapter 14 and the lower crankcase 3b. .

An oil regulator 17 is provided in the oil pan 4. The oil regulator 17 is sandwiched and fixed by a receiving seat 18 formed of a protrusion protruding upward on the outer peripheral surface of the bottom wall of the oil pan 4 and the lower crankcase 3b. The rotation shaft of the oil pump 5 is a power transmission mechanism (not shown) to the crankshaft 1a of the engine 1.
The oil pump 5 is driven by using the engine 1 as a power source.

A nozzle 21 is attached to the tip of an oil passage 20 that branches directly from the discharge side of the oil pump 5. Transmission gears 24 and 25 mounted from the nozzle 21 to the main shaft 22 and the counter shaft 23, respectively.
It is designed to lubricate them by injecting oil into them. A shelf portion 26 is formed on the lower crankcase 3b located under the transmission gears 24 and 25, and oil is temporarily stored in the shelf portion 26 during vehicle operation to promote lubrication of the change drum 27 and the like. It has become so.
While the vehicle is stopped, oil is returned to the oil pan 4 from the gap 28 at the tip of the shelf 26. A drain plug 29 for drainage is provided at the bottom of the oil pan 4.
Is provided.

Further, the rod-shaped mounting member 13 has an oil flow passage 13d communicating with the oil filter 9, and a bypass valve 30 is provided in the oil flow passage 13d.

In the above configuration, when the oil pump 5 is driven in accordance with the rotation of the crankshaft 1a, the oil in the oil pan 4 is transferred through the strainer 6 to the suction port 5a of the oil pump 5.
Is discharged from the discharge port 5b to the communication pipe 7.
The oil discharged to the communication pipe 7 enters the oil filter 9 through the oil inflow passage 8a, and the filter element 9b
The foreign matter is filtered and swirled to flow into the oil outflow passage 8b, and then guided to the oil passage 32 and branched. One of the branched flows is supplied to the crankshaft 1a and a piston, a cylinder or the like (not shown) to lubricate them, and the other is supplied to the bearings of the intake and exhaust side camshafts 33 and 34, cam surfaces, valves, etc. Are supplied to lubricate them. Further, in an engine that employs a hydraulic tappet, it is supplied as hydraulic oil to the hydraulic tappet. On the other hand, the oil introduced directly into the oil passage 20 from the discharge side of the oil pump 5 is injected from the nozzle 21 and lubricates the transmission gears 24 and 25. And the transmission gear 24,
The oil accumulated in the lower shelves 26 of 25 promotes lubrication of the change drum 27 and the like, and when the vehicle is stopped, this oil is returned to the oil pan 4 from the gap 35.

When a large amount of foreign matter is caught in the oil filter 9 and the oil pressure on the inflow side rises, the bypass valve 30 operates and the oil flows through the rod-shaped mounting member 13 without passing through the filter element 9b. Bypassing from the path 13d to the oil outflow path 8b prevents interruption of lubrication.

When the rotation of the engine 1 rises, the discharge amount of the oil pump 5 increases, and the discharge pressure of the oil reaches a predetermined value or more, the oil regulator 17 opens so that one of the oil discharged from the oil pump 5 is released. The part flows into the oil pan 4. As a result, the discharge pressure of the oil pump 5, that is, the oil pressure of the lubricating system is adjusted to a predetermined value. In this way, when the discharge pressure of the oil pump 5 returns to a predetermined value,
The oil regulator 17 is closed to stop the oil from flowing into the oil pan 4.

As described above, according to the oil filter mounting structure for the internal combustion engine of the present invention, the joint surface between the adapter and the rod-shaped mounting member becomes large due to the boss portion of the adapter, so that the adapter and the rod-shaped mounting member are joined together. The mounting dimensional accuracy is improved, and oil leaks are less likely to occur.

Further, since it is accommodated in the recess of the end plate of one end of the filter element of the boss portion of the adapter, the axial length of the filter element can be extended and the area thereof can be increased. Can be shortened and the protrusion length from the crankcase can be shortened, which is effective in achieving compactness of the entire engine. Further, since the oil filter and the adapter are fixed to the crankcase by the single common rod-shaped mounting member, a dedicated mounting member for fixing the adapter to the crankcase is unnecessary. Moreover, since the adapter is positioned by the rod-shaped mounting member, the positioning of the adapter is not uncertain. Furthermore, since the rod-shaped mounting member is screwed and fixed to the crankcase, there is little risk that the clean side and the dirty side of the oil in the oil filter are mixed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an internal combustion engine equipped with an oil filter mounting structure according to an embodiment of the present invention. 1 ... Internal combustion engine, 3 ... Crankcase, 9 ... Oil filter, 9b ... Filter element, 11b ...
... end plate, 11c ... recessed part, 13 ... rod-shaped mounting member, 13
d ... Oil flow passage, 14 ... Adapter. 14c ... Boss part

Continuation of the front page (56) Bibliography S. 54-14836 (JP, Y2) S. 57-35603 (JP, Y2) P. 56-24372 (S. 57-136414) Photographing the contents of the attached specifications and drawings The contents of the specifications and drawings attached to the application of Microfilm (JP, U) Actual Application No. 54-165686 (Actual No. 56-84019) Micro film (JP, U)

Claims (1)

[Claims] 1. An oil filter mounting structure for an internal combustion engine, wherein an oil filter is mounted on a crankcase of an internal combustion engine via an adapter and located on the center line thereof by a single rod-shaped mounting member. Is
The adapter is provided with a positioning function for the adapter by being screwed and fixed to the crankcase and fitted into a central fitting hole of a boss portion provided at the center of the adapter, and one end of a filter element of the oil filter. The internal combustion engine is characterized in that a spigot-shaped recess for accommodating the boss is provided in the center of the end plate disposed in the internal combustion engine, and an oil flow passage communicating with the oil filter is provided in the rod-shaped mounting member. Engine oil filter mounting structure.