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Cam follower device

A technology of cams and camshafts, which is applied to valve devices, engine components, machines/engines, etc., and can solve the problems of valve mechanism size increase, high friction, and high cost

Inactive Publication Date: 2009-04-15
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the valve train configuring such a multi-valve engine, when only a conventional cam follower device as described above is used, the number of parts of the valve train will become too many, and it is easy to Leads to the disadvantages of the valve train, that is, the valve train is made larger in size, heavy in weight, high in friction and high in cost

Method used

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Examples

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Effect test

no. 1 example

[0109] Figure 1 to Figure 4 A first embodiment of the invention is shown. The cam follower of this embodiment is configured for use in a valve train of an engine (OHC or DOHC type), such as a three-valve engine, a four-valve engine, or a five-valve engine, in which , the number of at least one of the intake valve and the exhaust valve provided for each cylinder is manufactured to be two or more. The cam follower device of the present embodiment thus designed includes a pair of plate-shaped rocker arms 17, 17, a support shaft 7a, and a tappet roller 9 that are identical in shape and size to each other.

[0110] Among these constituent parts, plate-like rocker arms 17 , 17 pairs are each formed into a shape like a boomerang by applying press working to a metal plate such as a steel plate. The two thus formed rocker arms 17 , 17 are arranged parallel to each other with a predetermined interval defined between the two rocker arms 17 , 17 . Furthermore, the support shaft 7a is ...

no. 2 example

[0125] Next, Figure 10 to Figure 11 A second embodiment of the invention is shown. In this embodiment, in order to provide the other end portion of the pair of rocker arms 17h, 17h (in Figure 10 To increase the strength at the middle left end portion), the two end portions are manufactured as thick portions 31, 31, and the protruding portions 18, 18 are provided on the other end portion. In this embodiment, in order to form the two thick portions 31, 31, the inner surfaces of the other end portions of the two rocker arms 17h, 17h are enlarged. Therefore, the thickness dimension T of the other end portion (thick portion 31, 31) of the two rocker arms 17h, 17h is made larger than the thickness dimension t of the one end portion and the middle portion of the two rocker arms 17h, 17h. (T>t). In the present embodiment constructed in the manner described above, compared to the two rocker arms 17h, the thickness dimension of 17h increases along its entire length without requirin...

no. 3 example

[0127] Next, Figure 12 A third embodiment of the invention is shown. Also, in this embodiment, in order to provide the other end portion of the pair of rocker arms 17i, 17i (in Figure 12 In order to increase the strength at the center left end portion), two of said other end portions are manufactured as thick portions 31a, 31a on which the protruding portions 18, 18 are provided. However, in the case of the present embodiment, in order to form the two thick portions 31a, 31a, the both side surfaces of the other end portions of the two rocker arms 17i, 17i are enlarged. Other configurations and functions of this embodiment are similar to those of the second embodiment described above.

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PUM

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Abstract

A cam follower device includes a pair of plate-shaped rocker arms 17 parallel mutually, a support shaft 7a fixed in support holes 8a, 8a at one end portions of the rocker arms 17 at both end portions and a tappet roller 9 supported rotatably around a circumference of an intermediate portion of the support shaft 7a. When the cam follower device is built in a valve train, rotary motion of a cam 2 provided on a camshaft is transmitted to valve elements 12 constituting two inlet (or exhaust) valves by the tappet roller 9 and the pair of rocker arms 17 so as to reciprocate the two valve elements 12 axially. By this configuration, the number of components in a valve train of an engine, in which a number of at least one of inlet and exhaust valves per cylinder is two or more, can be reduced.

Description

technical field [0001] According to the present invention, a cam follower device is constructed in a valve train of an engine, for example, a three-valve engine, a four-valve engine, or a five-valve engine, in which an intake valve provided for one cylinder and The number of at least any one of the exhaust valves is two or more for converting the rotation of the camshaft into the reciprocating motion of the two intake valves or the two exhaust valves. Background technique [0002] In addition to some two-cycle engines, in reciprocating engines (reciprocating piston engines) intake and exhaust valves are provided which are adapted to open and close simultaneously with the rotation of the crankshaft. In a reciprocating engine like these engines, the movement of the camshaft is transmitted to the intake and exhaust valves through the rocker arms so as to cause the intake and exhaust valves to reciprocate in the axial direction, the camshaft follows The rotation of the cranksha...

Claims

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Application Information

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IPC IPC(8): F01L1/26
Inventor 竹尾则之
Owner NSK LTD
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