ISO 7967-3:2022 レシプロ内燃エンジン — コンポーネントとシステムの用語、語彙 — Part 3: バルブ、カムシャフト ドライブ、および操作機構 | ページ 6

3.1.1

カムシャフト

作動サイクルの事象を制御する カム（3.1.5） を組み込んだシャフト。

注記 1:動作サイクルには、 バルブ (3.3.1) の開閉タイミング、噴射または点火、および補機の駆動が含まれます。

3.1.2

ワンピースカムシャフト

カムシャフト (3.1.1) 、 カム (3.1.5) 、シャフト、 カムシャフトシグナルホイール (3.1.6) は一体型

注記 1:図 1 を参照。

図 1 —一体型カムシャフト

3.1.3

一体型中空カムシャフト

シャフトが中空の一体型 カムシャフト (3.1.2)

注記 1:図 2 を参照。

図 2 —一体型中空カムシャフト

3.1.4

組み付けカムシャフト

カムシャフト (3.1.1) カム (3.1.5) 、 カムシャフトシグナルホイール (3.1.6) およびフランジなどがシャフトに取り付けられている

注記 1:図 3 を参照。

図 3 —組み立てられたカムシャフト

3.1.5

カム

バルブ（3.3.1） 又は燃料噴射ポンプを操作する部品。

3.1.6

カムシャフトシグナルホイール

カムシャフトで同期位相信号を生成するためのコンポーネント (3.1.1)

注記 1:図 4 を参照。

図 4 —カムシャフト シグナル ホイール

3.2.1

camshaft drive

mechanism by which the camshaft (3.1.1) is rotated

3.2.2

gear drive

crankshaft-to-camshaft driven by means of a series of gears

Note 1 to entry: Refer to Figure 5.

Figure 5—Gear drive

3.2.3

camshaft timing gear

gear for driving the camshaft (3.1.1) and ensuring the phase

Note 1 to entry: Refer to Figure 6.

Figure 6—Camshaft timing gear

3.2.4

chain drive

crankshaft-to-camshaft driven by means of sprocket wheels (3.2.5) and timing chain (3.2.6)

Note 1 to entry: Refer to Figure 7.

Figure 7—Chain drive

3.2.5

sprocket wheel

wheel that drives or is driven by the timing chain (3.2.6)

Note 1 to entry: Refer to Figure 7.

3.2.6

timing chain

component to transmit movement from the crankshaft to the camshaft (3.1.1)

Note 1 to entry: Refer to Figure 7.

3.2.7

chain tension adjuster assembly

mechanism to compensate for the increase in length resulting from chain wear, using a tensioning wheel (3.2.8) or a slide rail (3.2.9)

Note 1 to entry: Actuation is by spring or hydraulic mechanism.

Note 2 to entry: Refer to Figure 7.

3.2.8

tensioning wheel

wheel pressed against the chain to adjust its tension

Note 1 to entry: Refer to Figure 7.

3.2.9

slide rail

rail pressed against the chain to adjust its tension

3.2.10

slide bars

pair of components to absorb vibrations and to guide the chain

Note 1 to entry: Refer to Figure 7.

3.2.11

guide wheel

wheel to guide the chain

Note 1 to entry: Refer to Figure 7.

3.2.12

synchronous belt drive

crankshaft-to-camshaft driven by means of synchronous belt pulleys (3.2.13) and belt

3.2.13

synchronous belt pulley

pulley that has teeth to mesh with the teeth of a synchronous belt (3.2.14)

Note 1 to entry: Refer to Figure 8.

Figure 8—Synchronous belt drive

3.2.14

synchronous belt

elastic endless toothed belt

Note 1 to entry: Refer to Figure 8.

3.2.15

belt tensioner

mechanism to adjust tension in the belt

Note 1 to entry: Refer to Figure 8.

3.2.16

tensioning pulley

pulley pressed against the belt to adjust its tension

Note 1 to entry: Refer to Figure 8.

3.2.17

idler assembly

pulley for coordinating the running of the synchronous belt (3.2.14)

Note 1 to entry: Refer to Figure 9.

Figure 9—Idler assembly

3.2.18

variable valve timing mechanism

mechanism by which valve (3.3.1) timing is adjusted

Note 1 to entry: Refer to Figure 10.

Figure 10—Variable valve timing mechanism

3.2.19

control valve for variable valve timing mechanism

component by which the variable valve timing mechanism (3.2.18) is controlled

Note 1 to entry: Refer to Figure 11.

Figure 11—Control valve for variable valve timing mechanism

3.3.1

valve

poppet valve

component consisting of stem, head and face (seat) which allows combustion gases to enter or leave the cylinder

3.3.2

inlet valve

valve (3.3.1) by which a fresh charge is admitted into the engine combustion chamber

Note 1 to entry: Refer to Figure 12.

Figure 12—Valve group

3.3.3

exhaust valve

valve (3.3.1) by which the exhaust gases are discharged from the engine combustion chamber

Note 1 to entry: Refer to Figure 12.

3.3.4

hollow valve

valve (3.3.1) which is filled with metal in the valve hollow

Note 1 to entry: Refer to Figure 12.

3.3.5

valve spring retainer

component used to hold the valve spring (3.3.8) and to transmit spring force to the valve (3.3.1) stem

Note 1 to entry: Refer to Figure 12.

3.3.6

valve collet

valve key

valve lock

pair of components that hold the valve spring retainer (3.3.5) on the valve (3.3.1) stem

Note 1 to entry: Refer to Figure 12.

3.3.7

valve spring washer

washer that prevents damage to the cylinder head

Note 1 to entry: Refer to Figure 12.

3.3.8

valve spring

spring that closes the valve (3.3.1)

Note 1 to entry: Refer to Figure 12.

3.3.9

valve guide

component that guides the valve (3.3.1)

Note 1 to entry: Refer to Figure 12.

3.3.10

valve seat insert

replaceable valve (3.3.1) seat in the cylinder head

Note 1 to entry: Refer to Figure 12.

3.3.11

valve stem seal

seal between valve (3.3.1) stem and valve guide (3.3.9) located at the upper and/or lower end of the valve guide to prevent oil entering the cylinder head

Note 1 to entry: Refer to Figure 12.

3.3.12

valve cage

component separate from the cylinder head into which the valve (3.3.1) is fitted

Note 1 to entry: Cooled valve cages have the additional notation"cooled".

Note 2 to entry: Refer to Figure 13.

Figure 13—Valve cage

3.4.1

actuating mechanism

mechanism that provides or transmits power to other mechanisms by an electric, hydraulic or mechanical mechanism, such as a cam (3.1.5)

Note 1 to entry: Refer to Figure 14.

Figure 14—Actuating mechanism

3.4.2

tappet

device that bears on the cam (3.1.5) and slides in a guide to transmit reciprocating motion

3.4.3

sliding tappet

flat-faced tappet (3.4.2) in sliding contact with the cam (3.1.5)

Note 1 to entry: Refer to Figure 15.

Figure 15—Sliding tappet

3.4.4

roller tappet

tappet (3.4.2) that carries a roller that runs in contact with the cam (3.1.5)

Note 1 to entry: Refer to Figure 16.

Figure 16—Roller tappet

3.4.5

tappet roller

part of the roller tappet (3.4.4) that is used to transfer cam (3.1.5) stroke to the tappet (3.4.2)

Note 1 to entry: Refer to Figure 17.

Figure 17—Tappet roller group

3.4.6

tappet guide

component to guide the tappet (3.4.2)

Note 1 to entry: Refer to Figure 17.

3.4.7

hydraulic tappet

tappet (3.4.2) driven by hydraulic force

Note 1 to entry: Refer to Figure 18.

Figure 18—Hydraulic tappet

3.4.8

cam follower

lever that bears on the cam (3.1.5) and transmits reciprocating motion

Note 1 to entry: Refer to Figure 19.

Figure 19—Cam follow group

3.4.9

cam follower shaft

shaft about which the cam follower (3.4.8) pivots

Note 1 to entry: Refer to Figure 19.

3.4.10

cam follower bracket

bracket that carries the cam follower (3.4.8)

Note 1 to entry: Refer to Figure 19.

3.4.11

thrust cup

part of the cam follower (3.4.8) or the rocker arm (3.4.13) subjected to push-rod (3.4.12) pressure

Note 1 to entry: Refer to Figure 19.

3.4.12

push-rod

rod that transmits motion from the tappet (3.4.2) or cam follower (3.4.8) to the rocker arm (3.4.13)

Note 1 to entry: Refer to Figure 20.

Figure 20—Rocker arm group

3.4.13

rocker arm

rocker

components used to reverse push-rod (3.4.12) movement

Note 1 to entry: Refer to Figure 20.

3.4.14

valve adjuster

screw to adjust valve (3.3.1) clearance

Note 1 to entry: Refer to Figure 20.

3.4.15

rocker arm bracket

rocker arm pedestal

component that supports the rocker arm (3.4.13)

Note 1 to entry: Refer to Figure 21.

Figure 21—Rocker arm bracket group

3.4.16

roller rocker arm

roller finger follower

component by which cam (3.1.5) movement is transmitted to the valve (3.3.1)

Note 1 to entry: Refer to Figure 21.

3.4.17

rocker arm shaft

component on which the rocker arm (3.4.13) pivots

Note 1 to entry: Refer to Figure 21.

3.4.18

rocker arm bearing

component that supports the rocker arm (3.4.13)

Note 1 to entry: Refer to Figure 21.

3.4.19

valve bridge

bridge piece

component operating two or more valves (3.3.1) from a single force

Note 1 to entry: Refer to Figure 22.

Figure 22—Valve bridge

3.4.20

valve rotator

mechanism that rotates the valve (3.3.1)

Note 1 to entry: Refer to Figure 23.

Figure 23—Valve rotator

3.4.21

variable valve lift mechanism

mechanism by which valve (3.3.1) lift is adjusted

Note 1 to entry: Refer to Figure 24.

Figure 24—Variable valve lift mechanism

3.4.22

exhaust valve brake rocker arm

rocker arm (3.4.13) to control the exhaust valve (3.3.3) for engine braking

Note 1 to entry: Refer to Figure 25.

Figure 25—Exhaust valve brake rocker arm

3.4.23

exhaust valve brake valve bridge

valve bridge (3.4.19) to control two or more exhaust valves (3.3.3) for engine braking

Note 1 to entry: Refer to Figure 26.

Figure 26—Exhaust valve brake valve bridge

3.4.24

single overhead camshaft

SOHC

mechanism in which one camshaft (3.1.1) is located over the cylinder head to drive both intake and exhaust valves (3.3.3)

Note 1 to entry: Refer to Figure 27.

Figure 27—Single overhead camshaft

3.4.25

double overhead camshaft

DOHC

mechanism in which two camshafts (3.1.1) are located over the cylinder head to drive, respectively, intake and exhaust valves (3.3.3)

Note 1 to entry: Refer to Figure 28.

Figure 28—Double overhead camshafts

3.4.26

overhead valves mechanism

OHV

mechanism in which one camshaft (3.1.1) is located in the cylinder block to drive intake and exhaust valves (3.3.3) by the push-rod (3.4.12) and rocker arm (3.4.13)

Note 1 to entry: Refer to Figure 29.

Figure 29—Overhead valves mechanism