JPH0547315U - Cylinder head oil passage structure - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the flow of oil dripping on the bottom of the cylinder head to the oil drop passage. A distributor 5, which is attached to one end of a cylinder head 1 and is fitted into an axial hole 1e provided to face the camshaft 2 and is connected to one end of the camshaft, or a movement of the camshaft in the thrust direction. In the lower portion of the tip 5a of the preventing cam thrust cover facing one end of the cam shaft, passages 5b, 5c communicating with both sides of the cam shaft are provided, and an oil dropping passage 1c is provided for the cam shaft on the bottom surface 1a of the cylinder head. The oil dropped on the opposite side is made to flow to the oil drop passage side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of an oil passage of a cylinder head which improves the flow of oil dropped on the cylinder head to an oil drop passage.

[0002]

[Prior Art]

 The valve mechanism installed in the cylinder head of the engine is lubricated by supplying oil from an oil pan to each sliding part such as a camshaft journal and a journal, a cam and a rocker arm by an oil pump. The oil that has lubricated the sliding portion of the valve mechanism drops on the bottom surface 1a of the cylinder head 1 shown in FIG. 6, and the oil drop passage 1c provided on the side wall 1b on one side and the cylinder block (not shown). The oil is dropped and flows down through the passage into the oil pan for reflux.

The oil dropped on the oil drop passage 1c side (right side in the figure) of the bottom surface 1a of the camshaft 2 (FIG. 7) arranged in the cylinder head 1 easily flows into the oil drop passage 1c, The oil dropped on the bottom surface 1a on the opposite side (left side in the drawing) of the camshaft 2 from the oil drop passage 1c is less likely to flow to the oil drop passage 1c side. Therefore, as shown in FIGS. 6 and 7, a distributor mounted on the rear end 1d of the cylinder head 1 and connected to the rear end of the camshaft 2 or the camshaft 2 for preventing the camshaft 2 from shifting in the thrust direction. An oil passage 1f is provided on the inner peripheral surface of the shaft hole 1e for mounting a cam thrust cover (not shown), and the oil dropped on the side opposite to the oil drop passage 1c of the bottom surface 1a of the cylinder head 1 is passed through the oil passage 1f. Then, it is made to flow to the oil drop passage 1c side.

[0004]

[Problems to be solved by the device]

 By the way, in the case of an engine of a type in which a fuel pump or the like is not mounted on the rear end 1d of the cylinder head 1 depending on the engine specifications, the distributor or the cam thrust cover is connected or abutted to the rear end of the camshaft 2. Then, it is pushed deeply into the shaft hole 1e and mounted on the cylinder head. As a result, as shown in FIGS. 6 and 7, the oil passage 1f provided on the inner surface of the shaft hole 1e is closed by the tip 3a of the case of the distributor 3 and the bottom surface 1a opposite to the oil drop passage 1c. There is a problem in that the oil that has dripped above becomes difficult to flow to the oil drop passage 1c side and accumulates as shown by the chain double-dashed line H in FIG. 6, which may impair lubrication. The arrow Z in FIG. 6 indicates the zenith direction when the engine is mounted.

The present invention has been made in view of the above points, and a cylinder head in which oil dropped on the bottom surface of the cylinder head on the side opposite to the oil drop passage is made to easily flow to the oil drop passage side. The purpose is to provide the structure of the oil passage.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, according to the present invention, a distributor mounted on one end of a cylinder head, fitted in an axial hole provided facing the camshaft of the cylinder head, and connected to one end of the camshaft. Alternatively, a passage communicating with both sides of the cam shaft is provided at a lower end of a tip of the cam thrust cover that prevents the cam shaft from moving in the thrust direction, the side being opposite to one end of the cam shaft, and The oil dropped on the side opposite to the oil drop passage with respect to the shaft is made to flow to the oil drop passage side.

[0007]

[Action]

 The oil supplied to the valve operating mechanism of the cylinder head to lubricate each rotating portion and each sliding portion of the valve operating mechanism drops on the bottom surface of the cylinder head. The oil dripping on the bottom surface of the cylinder head where the oil drop passage is provided with respect to the camshaft flows into the oil drop passage as it is. The oil dropped on the bottom surface of the camshaft opposite to the oil drop passage is attached to one end of the cylinder head and is connected to one end of the camshaft or a distributor or one end of the camshaft. The oil flows through the passage provided in the lower portion of the tip of the cam thrust cover, which comes into contact with the oil thrust passage and prevents the movement in the thrust direction, to the oil drop passage side and then into the oil drop passage. As a result, the oil dripping on the cylinder head after lubricating the valve mechanism is prevented from accumulating in the cylinder head.

[0008]

【Example】

 An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The same members as those in FIG. 3 are designated by the same reference numerals. In FIGS. 1 and 2, a camshaft 2 is arranged in the center of a cylinder head 1, a shaft hole 1e is provided at a rear end 1d concentrically with the camshaft 2, and a distributor 5 is provided in the shaft hole 1e. 5a is fitted. The distal end 5a of the case of the distributor 5 has a cylindrical shape and the rotating shaft of the distributor penetrates through, and holes 5b and 5c are formed in the lower portion near the opening end.

The holes 5 b and 5 c are opened so as to face the bottom surfaces 1 a on both sides of the cam shaft 2, and communicate with both sides of the cam shaft 2. These holes 5b and 5c are oil passages, and are set to a size large enough to guide the oil accumulated on the opposite side of the oil drop passage 1c to the camshaft 2 to the oil drop passage 1c side. Has been done.

The tip end 5 a of the distributor 5 is fitted in the shaft hole 1 e of the cylinder head 1, and the tip end of the rotary shaft is connected to the rear end of the cam shaft 2 so that the distributor 5 can rotate integrally with the cam shaft 2. It is said that. The flange 5d of the distributor 5 is fixed to the bosses 1g and 1g formed on the rear end surface of the cylinder head 1 by bolts (not shown).

The operation will be described below. The oil in the oil pan of the engine is pumped by an oil pump driven by the engine through a cylinder block and an oil rising passage of the cylinder head 1 to a valve mechanism (not shown) provided in the cylinder head 1. It is supplied to each rotating part and each sliding part, and after they are lubricated, they are dripped on the bottom surface 1a of the cylinder head 1.

The oil that has dripped to the oil drop passage 1c side of the bottom surface 1a with respect to the camshaft 2 flows on the bottom surface 1a, flows into the oil drop passage 1c, and flows down to the oil pan. Further, the oil that has dripped on the side of the camshaft 2 opposite to the oil drop passage 1c of the bottom surface 1a flows toward the rear end and flows into the distributor 5 through the hole 5b of the distributor 5 as shown by the arrow. Further, it flows out from the hole 5c on the opposite side onto the bottom surface 1a of the camshaft 2 on the oil dropping passage 1c side, and then flows into the oil dropping passage 1c.

That is, the oil dropped on the side opposite to the oil drop passage 1c with respect to the camshaft 2 flows to the oil drop passage 1c side through the holes 5b and 5c formed in the tip 5a of the distributor 5. It flows into the oil drop passage 1c. As a result, the oil dropped on the bottom surface 1a of the cylinder head 1 after lubricating the valve mechanism does not collect in the cylinder head 1 but flows into the oil drop passage 1c and is returned to the oil pan.

3 to 5 show an example of the cam thrust cover 6 mounted in the shaft hole 1e of the cylinder head 1 in place of the distributor 5, and the cam thrust cover 6 has a cylindrical tip 6a, A large notch 6b is provided below the open end of the side wall. Then, the notch 6b is opened so as to face the bottom surfaces 1a on both sides of the camshaft 2 in a state where the tip 6a of the cam thrust cover 6 is fitted in the shaft hole 1e of the cylinder head 1 of FIG. There is. As a result, the oil dropped on the bottom surface 1a of the camshaft 2 opposite to the oil dropping passage 1c can flow to the oil dropping passage 1c side through the notch 6b and easily flow into the oil dropping passage 1c. Becomes

[0015]

[Effect of the device]

 As described above, according to the present invention, the oil supplied to the valve operating mechanism of the cylinder head and dripping on the bottom surface of the camshaft on the side opposite to the oil drop passage is provided on the distributor or the cam thrust cover. It easily flows through the passage to the oil drain side and prevents it from accumulating in the cylinder head. As a result, the engine oil circulates smoothly and good lubrication is possible. Further, by providing the oil passage on the side of the distributor or the cam thrust cover, there is an effect that processing becomes easy.

[Brief description of drawings]

FIG. 1 is an end view of a cylinder head to which the present invention is applied.

FIG. 2 is a cross-sectional view of the main parts of FIG.

FIG. 3 is a plan view showing an embodiment of a cam thrust cover to which the present invention is applied.

FIG. 4 is a side view of FIG.

5 is a cross-sectional view taken along the line VV of FIG.

FIG. 6 is an end view of a cylinder head including a conventional oil passage.

7 is a cross-sectional view of the main parts of FIG.

[Explanation of symbols]

 1 Cylinder Head 1c Oil Drop Passage 1e Shaft Hole 2 Camshaft 5 Distributor 5b, 5c Hole (Oil Passage) 6 Cam Thrust Cover 6b Notch

Claims (1)

[Scope of utility model registration request] 1. A distributor attached to one end of a cylinder head, fitted in an axial hole provided to face the camshaft of the cylinder head, and connected to one end of the camshaft, or a thrust direction of the camshaft. A passage that communicates both sides of the cam shaft is provided at the lower end of the end of the cam thrust cover that prevents movement from the side facing the one end of the cam shaft, and is opposed to the oil drop passage with respect to the cam shaft of the cylinder head. The structure of the oil passage of the cylinder head is characterized in that the oil dropped to the side is made to flow to the oil drop passage side.