JPH04119307U - Tappet shim with oil groove - Google Patents

Abstract

(57) [Summary] (with amendments) [Purpose] This invention relates to tappet shims used in valve devices that open and close engine combustion chambers. The purpose is to make it possible to prevent it. [Structure] An oil groove 13 is provided on a contact surface 12a of the tappet shim 12 with the valve lifter 5.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is applied to tappet shims used in valve devices that open and close engine combustion chambers. related.

0002

[Conventional technology]

Conventionally, a DOHC type engine is configured as shown in Figs. 3 and 4. A valve device V for opening and closing the combustion chamber 2 is provided in the cylinder head 1 of the engine E. ing.

0003 This valve device V includes a valve 3 and a valve stand fixed to the tip of the valve 3. It is equipped with TEM 4.

0004 The valve stem 4 extends obliquely upward from the combustion chamber 2, and has a rear end at its end. A retainer 7 is fixed via a retainer lock 6.

[0005] A cylinder head portion 1a corresponding to an intermediate position between the retainer 7 and the valve stem 4; A valve spring 8 is interposed between the valve 3 and the valve stem 4 to close the valve 3 and the valve stem 4. is biased in the direction.

[0006] A valve spring 8 and a retainer 7 are attached to the distal end of the valve stem 4. Make sure to cover it. A valve lifter 5 having a cylindrical shape with a bottom is mounted on the valve.

[0007] The valve lifter 5 inserts its cylindrical portion into the guide hole 1b formed in the cylinder head 1. It is slidably inserted.

[0008] A cam fixed to the camshaft 9 is located diagonally above the valve lifter 5. 10 is provided, and the profile surface 10a of the cam 10 is located outside the valve lifter 5. It is arranged so as to face the end face.

[0009] Further, a recess 5a is formed on the outer end surface of the valve lifter 5, and the recess 5a has a circular shape. A plate-shaped tappet shim 11 is fitted. In other words, this tappet shim 11 is , is interposed between the valve lifter 5 and the cam 10.

0010 With this configuration, when the engine is operated, the camshaft 9 As the cam 10 rotates, the valve lifter 5 and the valve stem 4 move. A return movement takes place via tappet shims 11. This allows valve 3 to open and close. be called.

[0011] By the way, the tappet shim 11 described above is used for valve clearance in a valve device. It is used to properly set the tappet shim 11, and is used to adjust the shape of the tappet shim 11. The valve clearance is finely adjusted. And at this time, the tappet shim 11 performs appropriate rotation.

0012

[Problem that the idea aims to solve]

However, if the tappet shim 11 moves poorly, the cam 10 and the tappet shim 11 move poorly. Abrasion is likely to occur on the outer end surfaces of the pet shim 11 and the valve lifter 5.

[0013] For this reason, conventionally, in order to prevent the occurrence of wear, a tappet system was used as shown in Fig. 4. A crowning process is performed to inflate the upper end surface of the drum 11 at a desired position, The cam profile surface 10a of the cam 10 is tapered. However, with either method, processing is time-consuming and parts costs are high. There is a problem.

[0014] This invention was devised in view of these issues, and includes an oil groove in the tappet shim. The required process of forming a valve device without increasing the cost of parts To provide a tappet shim with an oil groove that can prevent wear in the parts. The purpose is to

[0015]

[Means to solve the problem]

For this reason, the oil grooved tappet shim of this invention opens and closes the engine combustion chamber. It is fitted into the recess on the outer end surface of the valve lifter of the valve device, and the outer end surface is In a disc-shaped tappet shim that is interposed so as to engage with the profile surface of the cam. , is characterized by an oil groove provided on the contact surface with the valve lifter. .

[0016]

[Effect]

The oil grooved tappet shim of the present invention described above has an oil groove in the tappet shim. is supplied, reducing the coefficient of wear between the tappet shim and valve lifter. Wear in the required parts of the valve device is prevented.

[0017]

【Example】

Hereinafter, an oil grooved tappet shim as an embodiment of the present invention will be explained with reference to the drawings. To explain this, Fig. 1 is a longitudinal sectional view showing the arrangement of tappet shims, and Fig. 2 is a longitudinal sectional view showing the arrangement of tappet shims. It is a bottom view of Toshim.

[0018] Most of the valve devices to which the tappet shim according to this embodiment is installed are 3.The structure is almost the same as the conventional example shown in Fig. 4, so detailed explanation is omitted. do.

[0019] Now, in this embodiment, the tappet shim 12 as shown in FIGS. 5 and cam 10 (this cam 10 has a tapered cam profile surface 10a) (not a physical object).

[0020] This tappet shim 12 has a concave portion on its lower surface (a concave portion with an outer end surface of the valve lifter). An oil groove 13 is formed on the side surface (contact surface with the valve lifter) 12a, It is designed to reduce the friction between the valve lifter 5 and the tappet shim 12. .

[0021] The oil groove 13 includes a large number of concentric grooves 13 centered on the axis of the tappet shim 12. a, and these groove portions 13a communicate with each other through a communication path 13b. The oil is supplied evenly to the entire bottom surface of the tappet shim 12. It is becoming popular.

[0022] With the above configuration, when the engine is operated, oil is transferred to the tappet shim 12. Refueling will be carried out. As a result, the oil groove 13 on the bottom surface of the tappet shim 12 is moistened. The lubricating oil accumulates and the coefficient of friction between the valve lifter 5 and tappet shim 12 decreases. Therefore, the tappet shim 12 can be easily rotated. Therefore, the rotation of valve 3 will be carried out smoothly.

[0023] Note that oil is supplied to the concentric groove portion 13a universally through the communication path 13b. It is done without.

[0024] In this way, crowning is applied to the tappet shim, and the cam profile surface is Under the tappet shim without the need for time-consuming processing such as adding a taper. Since it is only necessary to form oil grooves on the surface, wear of the required parts of the valve device is greatly reduced. This makes it possible to reduce the cost without significantly increasing the cost, and this allows the long-term lifespan of the engine to be reduced. This enables stable operation over long periods of time.

[0025]

[Effect of the idea]

As detailed above, according to the oil grooved tappet shim of the present invention, the tappet It has an extremely simple configuration with an oil groove in the shim, making it ideal for valve equipment. It is now possible to reduce wear in required parts without requiring a significant increase in costs, and This has the advantage that stable operation of the engine can be realized over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing the arrangement of tappet shims as an embodiment of the present invention.

FIG. 2 is a bottom view of a tappet shim as an embodiment of the present invention.

FIG. 3 is a vertical sectional view of a main part of a conventional valve device.

FIG. 4 is a vertical cross-sectional view of a main part of a conventional valve device.

[Explanation of symbols]

1 cylinder head 1a Cylinder head part 1b Guide hole 2 Combustion chamber 3 valve 4 Valve stem 5 Valve lifter 5a recess 6 Retainer lock 7 Retainer 8 Valve spring 9 Camshaft 10 cam 10a Profile surface 11,12 Tappet shim 11a Lower surface of tappet shim 13 Oil groove 13a Groove part 13b Communication path E engine V valve device

Claims (1)

[Scope of utility model registration request] 1. A disc-shaped tappet shim that is fitted into a recess on an outer end surface of a valve lifter of a valve device that opens and closes an engine combustion chamber, and is interposed so that the outer end surface engages with a profile surface of a cam, comprising: A tappet shim with an oil groove is characterized in that an oil groove is provided on the contact surface with the valve lifter.