JPH061704U - Valve lifter for valve - Google Patents

Abstract

(57) [Summary] [Object] To provide a valve lifter for a valve, which can reduce the manufacturing cost and improve the manufacturing efficiency and can surely prevent the inner shim from rotating and coming off during use. [Structure] A recess 10 is formed on the back surface of a crown surface portion 6a of a valve lifter body 6, and an inner shim 8 ₁ is fitted in the recess 10 to form a back surface 8a of the inner shim 8 ₁ and a bottom surface 10a of the recess 10. Engagement portions 13 ₁ and 14 ₁ that engage with each other in the rotational direction of the inner shim 8 ₁ are formed, respectively, while the caulking portion 11 formed at the peripheral edge of the opening end of the recess 10 is formed on the outer peripheral surface of the inner shim 8 _1. Engaged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a valve valve valve lifter that reciprocally slides in a cylinder head bore according to the rotation of a cam shaft while contacting a valve stem of an intake / exhaust valve in an internal combustion engine.

[0002]

[Prior art]

 2. Description of the Related Art Conventional valve lifters for valves include, for example, those disclosed in Japanese Patent Laid-Open No. 63-147907. In this valve lifter, as shown in FIG. 9, a recess 21 is formed on the back surface of the crown portion 20a of the valve lifter body 20 made of a light metal material such as an aluminum alloy, and the recess 21 is in contact with the valve stem 22 of the intake / exhaust valve. An inner shim 23 made of an iron-based metal material is fitted. The recess 21 and the inner shim 23 are formed in a non-circular shape, and the outer peripheral surface of the inner shim 23 is engaged with a caulking portion 24 formed at the peripheral edge of the opening end of the recess 21.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional valve lifter for valve operation, the force for rotating the valve lifter body 20 is applied by the rotation of the cam 26 for opening and closing the intake / exhaust valve provided above the cylinder head bore 25, and the valve stem 22 is rotated. The inner shim 23, which is the contact portion, also receives a force to rotate it in the recess 21, and the difference in the linear expansion coefficient between the valve lifter body 20 and the inner shim 23 loosens the restraint of the inner shim 23 by the side wall of the recess 21. There is a risk. For this reason, the inner shim 23 rattles in the rotation direction in the recess 21, and the side wall of the recess 21 is depressed, which may reduce the durability of the valve lifter body 20.

Further, since the recess 21 has a non-circular shape, it is necessary to carry out counter boring at the machining center, which requires equipment cost and counter boring cost. The same applies to the inner shim 23. In addition, a positioning process is required when the inner shim 23 is assembled and when the caulking is performed, and the number of man-hours increases, so that the assembly cannot be easily performed. Therefore, the manufacturing cost is high and the manufacturing efficiency is low.

The present invention has been made to solve the above problems, and can reduce the manufacturing cost and improve the manufacturing efficiency, while at the same time reliably rotating and dropping off the inner shim during use. The purpose is to provide.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the valve lifter for a valve according to the present invention has a recess formed on the back surface of the crown surface of the valve lifter body, and an inner shim is fitted in the recess, and the back surface of the inner shim and the recess Engagement portions that engage in the rotation direction of the inner shim are formed on the bottom surface, respectively, while the caulking portion formed on the peripheral edge portion of the opening end of the recess is engaged with the outer peripheral surface of the inner shim. It is a thing.

[0007]

[Action]

 With the above structure, when the inner shim is assembled, the inner shim is fitted in the recess, and the side walls of the recess are guided to engage the engaging portions (the bottom surface of the recess contacts the back surface of the inner shim). After doing so, perform caulking.

After the inner shim is installed, the caulking portion holds the inner shim in the recess, and the engaging portion provided on the back surface of the inner shim is engaged with the engaging portion provided on the bottom surface of the concave portion in the rotation direction of the inner shim. Since the state of being engaged with is retained, the inner shim does not slip out of the recess and does not rotate in the recess.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a valve mechanism, FIG. 2 (1) is a sectional view showing an inner shim mounted state in the valve lifter for valve of FIG. 1, and (2) is a main part of (1). It is a bottom view. 3 (1) is a front view showing the inner shim in FIG. 2, and (2) is a bottom view of (1). FIG. 4 (1) is a front view showing a modification of the inner shim of FIG. 3, and (2) is a bottom view of (1). FIG. 5 (1) is a front view showing another modification of the inner shim of FIG. 3, and (2) is a bottom view of (1). 6 (1) and 6 (2) are cross-sectional views showing a state before and after mounting the inner shim of FIG.

1 to 3, 1 is a cam shaft on which a cam 1a is formed, 2 is a valve stem of an intake / exhaust valve, 3 is a valve spring, 4 is a retainer for suppressing an upper end portion of the valve spring 3, and 5 is a retainer. A cotter for fixing the retainer 4 to the upper end of the valve stem 2, 6 is a valve lifter body made of a light metal material such as aluminum alloy, and 7 and 8 ₁ are mounted between the cam 1a and the valve lifter body 6 to adjust the valve gap. A circular shim made of a ferrous metal material.

A circular concave portion 9 is formed on the surface of the crown surface portion 6a of the valve lifter body 6, and a circular concave portion 10 is formed on the rear surface thereof, while a V-shaped groove 11a is formed outside the concave portion 10 on the rear surface. By doing so, the caulking portion 11 is formed on the opening end side wall portion of the recess 10. An outer shim 7 is fitted in the recess 9, and an inner shim 8 ₁ is fitted in the recess 10, and a caulking portion 11 ₁ is engaged with the outer peripheral surface of the inner shim 8 ₁ .

Then, the valve lifter body 6 is fitted in the cylinder head bore 12 of the internal combustion engine, and the valve stem 3 is urged to bring the valve stem 2 into contact with the surface of the inner shim 8 _{1 and} the outer shim 7. The cam 1a is brought into contact with the surface of the valve 1 to form a valve mechanism.

In the above valve lifter for valve operation, the engaging portion 13 ₁ (protrusion in the embodiment) is provided on the back surface 8 a of the inner shim 8 ₁ , and the engaging portion 14 ₁ (in the embodiment is provided) on the bottom surface 10 a of the recess 10. Recesses are formed so as to engage with each other in the rotation direction of the inner shim 8 ₁ .

The engagement portions 13 ₁ and 14 ₁ will be specifically described.

As shown in FIG. 3, the engaging portion 13 ₁ is formed into a pointed shape in a segmental cross section, and is provided so as to project on the outer peripheral side of the back surface 8 a of the inner shim 8 ₁ . Since the engaging portion 13 ₁ is locally and sharply formed on the back surface 8a of the inner shim 8, the engaging portion 14 ₁ is formed by press working as described later. That is, as shown in FIG. 6 (1), after fitting the inner shim 8 ₁ in the recess 10, as shown in FIG. 6 (2), the inner shim 8 ₁ is pressed by the press machine 15, thereby bite the engaging portion 13 ₁ to the bottom surface 10a of the recess 10, the bottom surface 10a that is brought into contact with the rear surface 8a of the inner shim 8, the bottom of the engaging portion 14 ₁ is recess 10 corresponding to the engaging portion 13 ₁ It is formed on the surface 10a.

The engaging portion 13₁Similar to the above, as shown in FIG. 4, the inner shim 8₂Ridge-shaped engaging portion 13 provided along one diameter line of the rear surface 8a₂, Inner shim 8 as shown in FIG.₃Of the rear surface 8a of each of the projections 13a, 11b, 11c, 11c, 11c, 11c, 11c, 11c, 11c, 11c, 11d, 11c, 11d, 11c, 11d, 11c, 11d, 11c, 11d, 11c, 11d, 11c, 11d, 11c, 11d being arranged in such a manner as to be offset toward the outer peripheral side.₃There are both engaging parts 13₃, 13₃Is the engaging portion 13 ₁ Like the above, it is formed in a pointed shape. Further, similarly to the above, the engaging portion 13 is formed on the bottom surface 10a of the recess 10.₃, 13₃A concave portion (not shown) corresponding to is formed.

In the above structure, the inner shim 8₁(8₂, 8₃) Is installed by inserting the inner shim 8 in the recess 10.₁The inner shim 8 with the side wall of the recess 10 as a guide.₁The inner shim 8 on the bottom surface 10a of the recess 10 by pressing₁(8 ₂ , 8₃) Is engaged with the bottom surface 10a until the back surface 8a of₁(13₂1 3₃), And then tighten it.

Thus, at the same time when the inner shim 8 ₁ (8 ₂ , 8 ₃ ) is pressed, the engaging portion 14 ₁ corresponding to the engaging portion 13 ₁ (13 ₂ , 13 ₃ ) is recessed in the engaged state. Since it is formed on the bottom surface 10a of 10, the engaging portion 14 ₁ does not have to be processed before assembly, and the labor for engaging the engaging portions 13 ₁ and 14 ₁ is unnecessary.

[0020] After the inner shim 8 ₁ embedded, caulking portion 11 the inner shim 8 ₁ is held in the recess 10, the bottom surface of the engaging portion 13 ₁ is recess 1 0 provided on the inner shim 8 ₁ backside 8a The state in which the inner shim 8 is engaged with the engaging portion 14 ₁ provided in 10a in the rotational direction of the inner shim 8 is maintained. Therefore, the inner shim 8 ₁ does not fall out of the recess 10 and does not rotate in the recess 10.

Next, another embodiment of the present invention will be described with reference to the drawings.

FIG. 7 is a sectional view showing how the inner shim is mounted on the valve lifter body, FIG. 8 (1) is a bottom view of the inner shim in FIG. 7, and FIG. 8 (2) is taken along line AA of (1). FIG.

This embodiment is different from the above-mentioned embodiment in that a serrated engaging portion 13 ₄ is provided so as to project in the direction of one diameter line over the entire back surface 8a of the inner shim 8 ₄ , and in correspondence therewith That is, the sawtooth-shaped engaging portion 14 ₄ is recessed in the direction of one diameter line over the entire bottom surface 10 a of the recess 10.

[0024] In the above configuration, integration of the inner shim 8 _4, by fitting the In'nashi Program 8 ₄ in the recess 10, by rotating the inner shim 8 ₄ to guide the side wall of the recess 10, the The engaging portion 13 ₄ provided on the back surface 8a of the inner shim 8 ₄ was engaged with the engaging portion 14 ₄ provided on the bottom surface 10a of the recess 10 (the back surface 8a of the inner shim 8 ₄ was attached to the bottom surface 10a of the recess 10). After abutting against), and then caulking.

In this way, the inner shim 8 ₄ can be easily and quickly assembled in that the engaging portions 13 ₄ and 14 ₄ are engaged with each other using the side wall of the recess 10 as a guide.

[0026] After incorporation of the inner shim 8 _4, the caulking portion 11 the inner shim 8 ₄ is held in the recess 10, the bottom surface of the engaging portion 13 ₄ are recesses 1 0 provided on the back surface 8a of the inner shim 8 ₄ A state in which the inner shim 8 ₄ is engaged with the engaging portion 14 ₄ provided in 10a in the rotation direction is maintained. Therefore, the inner shim 8 ₄ does not fall out of the recess 10 and does not rotate in the recess 10. Further, the engaging areas of the engaging portions 13 ₄ and 14 ₄ are significantly increased as compared with the above-mentioned embodiment, and a larger rotation stopping effect than that of the above-mentioned embodiment is obtained.

[0027]

[Effect of device]

 As described above, according to the present invention, the concave portion is formed on the back surface of the crown portion of the valve lifter body, the inner shim is fitted in the concave portion, and the inner shim is rotated in the rotation direction of the inner shim between the back surface of the inner shim and the bottom surface of the concave portion. While forming the engaging parts to be engaged with each other, the caulking part formed on the peripheral edge of the opening end of the recess is engaged with the outer peripheral surface of the inner shim, and the formation of the recess can be performed by turning. Therefore, the counter boring cost can be reduced, and the inner shim can be easily manufactured by machining a circular press product, which can reduce the machining cost.

Further, since the inner shim can be incorporated by engaging the engaging portions with each other by rotating the inner shim using the side wall portion of the recess as a guide, the positioning process unlike the prior art is not required. , Inner shim can be installed and crimped easily and quickly.

Furthermore, after the inner shim is assembled, the caulking portion holds the inner shim in the recess, and the engaging portion provided on the back surface of the inner shim is engaged with the engaging portion provided on the bottom surface of the recess. It can be engaged in the rotational direction.

Therefore, the manufacturing cost can be reduced and the manufacturing efficiency can be improved, and at the same time, the inner shim can be prevented from being rotated and pulled out during use.

[Brief description of drawings]

FIG. 1 is a sectional view showing a valve mechanism of an embodiment of the present invention.

2 (1) is a cross-sectional view showing a state in which an inner shim is attached to the valve lifter for a valve shown in FIG. (2) It is a bottom view of the main part of (1).

3 (1) is a front view showing the inner shim in FIG. 2. FIG. (2) It is a bottom view of (1).

4 (1) is a front view showing a modified example of the inner shim of FIG. 3. FIG. (2) It is a bottom view of (1).

5 (1) is a front view showing another modified example of the inner shim of FIG. 3. FIG. (2) It is a bottom view of (1).

6 (1) is a sectional view showing a state before mounting the inner shim of FIG. 2. FIG. (2) It is sectional drawing which shows the state after mounting | wearing with the inner shim of (1).

FIG. 7 is a cross-sectional view showing a state in which an inner shim is mounted on a valve lifter for valve according to another embodiment of the present invention.

8 (1) is a bottom view of the inner shim in FIG. 7. FIG. (2) It is sectional drawing which follows the AA line of (1).

FIG. 9 is a bottom view showing a state where an inner shim is mounted in a valve lifter for a valve according to a conventional example.

[Explanation of symbols]

6 Valve lifter body 6a Crown surface part 8 ₁ , 8 ₂ , 8 ₃ , 8 ₄ Inner shim 8a Back surface 10 Recess 10a Bottom surface 11 Crimping part 13 ₁ , 13 ₂ , 13 ₃ , 13 ₄ Engaging part 14 ₁ , 14 ₄ Engagement Department

Claims (1)

[Scope of utility model registration request] 1. A recess is formed in the back surface of the crown surface of a valve lifter body, an inner shim is fitted in the recess, and the back surface of the inner shim and the bottom surface of the recess are engaged in the inner shim rotation direction. While forming the respective engaging portions to
A valve lifter for valve actuation, wherein a caulking portion formed at a peripheral edge portion of an opening end of the recess is engaged with an outer peripheral surface of the inner shim.