This standard specifies the direction of rotation and cylinder number marking method of reciprocating internal combustion engines (hereinafter referred to as internal combustion engines) and the valve marking method on the cylinder head when the cylinder head is installed on the engine or removed. This standard also specifies the definition of the right engine, left engine and various positions of the in-line internal combustion engine, so as to describe the position of each component (accessory) installed on the engine. This standard is applicable to land, railway traction and marine reciprocating internal combustion engines, but not to engines used to drive agricultural tractors, road vehicles and aircraft. It can be used for engines for road construction machines and bulldozers, industrial truck power and other purposes for which there is no suitable standard at present. GB/T 726-1994 Definition of right engine and left engine of single-row reciprocating internal combustion engine GB/T726-1994 Standard download decompression password: www.bzxz.net

trme:621.432
National Standard of the People's Republic of China
GB/T726—94
ISO 1204-. 1990
Reciprocating Internal combustion engines-Desiguation of the direction of rotation andof cylinders and valves in cylinder hcads anddefinilion of rlght-haad and left-band in Hneengines and locations on an in-line internal combustion engine engine1994-12-27issued
1995-07-01issued
National Bureau of Technical Supervision
National Standard of the People's Republic of China
Reciprocating internal combustion engine
Definition of direction of rotation, marking of valves on cylinders and cylinder heads and right and left engines in line internal combustion engines
and engine orientation
Reciprocating internal combustion engine
Definition of direction of rotation, marking of valves on cylinders and cylinder heads and right and left engines in line internal combustion engines
and engine orientation -1990Www.bzxZ.net
Replacement GB2595
GB32-82
GB467384
GB5929-86
This standard is equivalent to the international standard S01204-1990 Reciprocating internal combustion engines - Rotating direction, cylinder and cylinder valve markings, and the definition of right engine, left engine and engine orientation of in-line internal combustion engines. 1 Subject content and applicable scope
This standard specifies the rotation direction and cylinder number marking method of reciprocating internal combustion engines (hereinafter referred to as internal combustion engines) and the valve marking method on cylinders when the valve is installed on or removed from the engine. This standard also defines the positions of in-line internal combustion engines, in-line engines and engine parts and accessories installed on the engine.
This standard applies to internal combustion engines of the same type, except for engines used to drive agricultural tractors, road vehicles and aircraft. It can be used for engines for construction machinery and bulldozers, industrial trucks and other purposes for which the technical standards are not yet met.
2 Definition of internal combustion engine positions
2.1 Engine positions are shown in Figure 1,
V= Figure 1, engine block, approved by the Electric Power Technology Supervision Bureau on December 27, 1994, implemented on July 1, 1995, GB/T726-94, 2.2 Drive end: the part of the engine body closest to the observer, note: the part of the engine body that is farther from the observer than the fourth one, 2.3 Free end: the part of the engine body that is farther from the observer, 2.4 Left side: the part of the engine body on the left side from the observer's perspective, 2.5 The part of the engine body on the left side from the observer's perspective, 2. 6 Top: From the viewer's perspective, the main part at the upper end of the engine 2.7 Top: From the viewer's perspective, the main part at the lower end of the engine: In the case of a vertical engine axis, the left and right sides cannot be determined alone. The top and bottom of the engine cannot be used alone. This definition must be used as a reference for other parts. 2.8 Operation examples: The main part of the engine that starts and controls the operation and parking of the engine. 7.9 Exhaust system: The main part of the engine where the exhaust pipe is installed. 3 Rotation direction
31 The rotation direction of a reciprocating internal combustion engine refers to the rotation direction of a reciprocating internal combustion engine according to Section 4.4 .1 The position of the observer as defined in clause 2 is the direction of rotation of the engine drive end.
32 The direction of rotation is shown in 2,
Following the timing chart
Figure 3 The position of the observer
4.1 Direction of rotation and cylinder mounting
When the direction of rotation is required to identify the cylinder number and the type of internal combustion engine as right-hand or left-hand and the engine disk, the observer's position and direction shall be in accordance with the provisions of clauses 4.1.1 to 4-1.3. 4.1.1 The position of the observer relative to the engine, at the engine drive end The axis extension is located with the V-shaped end of the inspection rod facing the end (see Figure 3). This position also applies to engines with integral (internal) transmissions (with or without transmission) and with integral (internal) gear transmissions (with or without transmission). The inspection position should be determined relative to the visible engine drive shaft. Figure 3 Inspection position 4.1.2 For multi-cylinder internal combustion engines, the inspection position shall be determined based on the main shaft in the engine that outputs the total power of all cylinders according to 4.1.1. 4.1.3 If the engine has more than one drive shaft, the manufacturer shall specify the reference shaft end used to indicate the direction of rotation, cylinder number, inline right or left engine and engine side, and the valve mark on the 42 cylinder. GB/T 726 --. 94
When observing the valve on the cylinder, the observer's observation position and direction should be consistent with the provisions of 4.2.1~4.2.3. 4.2.1 For in-line internal combustion engines, the observation part should be the size of the valve. The observation part should produce two valves (see Figure 1). The valve family can reach the valve. For in-line ignition engine inspection: 1) This valve operation is shown in Chapter 7.
4.2.2 For dual-row and dual-cylinder internal combustion engines, the observation position can be any row of valves. The observer's line of sight should be the valve on the nearest row of the valve (see Figure 5). The valves of the single-piston internal combustion engine shown in Figure 5 shall be equipped with the following features: 1) See Chapter 7 for valve markings. 4.2.3 For vertical crankshaft, inclined and opposed internal combustion engines, they shall be rotated until the crankshaft is in a horizontal position and the engine is in a vertical position with the cylinder above the drive shaft. For opposed internal combustion engines, they shall be rotated to an ideal vertical position. When the crankshaft is in a horizontal position, the cylinder shall face the bottom side of the engine and the force on the crankshaft shall be directed in the direction indicated. 5. Indication of rotation direction 5.1 Direction of rotation From the observer's position as described in Chapter 4, indicate the clockwise or counterclockwise direction (see Note 2). 5.2 If the engine can be rotated in two directions, the manufacturer shall indicate the recommended direction of rotation if any. 6 Red gas markings
Each cylinder of an internal combustion engine shall be marked with a number (sequential terminal number 1, 2, 3, etc.) or a combination of a letter (sequential letter A, B, C, etc.) and a number.
6.1 Type-matching internal combustion engines
GB/T 726—94
It is advisable that the individual gases of a single-row internal combustion engine be marked with numbers only. Starting with the gas nearest the observer (see Chapter 4), the gas is marked with 1, and so on. See Figures 6(a), (h) and (ce). Single-row internal combustion engines are marked with the number 1,
(a) Column internal combustion engine
(b) Vertical internal combustion engine
(c) Horizontal internal combustion engine
6.2 Multi-row internal combustion engines
6.2.1 The individual gases of a multi-row internal combustion engine (see Figure 6) are marked with a symbol consisting of a capital letter and a capital letter. For example: A1.A6.D6, etc. For the remodeled multi-engine series, a half plane is assumed to be centered on the drive shaft axis (assuming the crankshaft is in a horizontal position). The half plane is assumed to rotate in a clockwise direction. The starting position of the half plane must be: and it is located to the left of the viewer (see Section 4) (the position of the instant hand at a few o'clock), and the half plane that rotates clockwise is marked with the letter A in the first or initial position of the scan, and the following marks are marked with letters (see Figure 8a) ~ (h
GR/T726-94
6.2.2 Each cylinder shall be equipped with a large cylinder according to 5.2.1) followed by a sub-character (following the provisions of 6.1 for in-line internal combustion engines> The combined symbol is used to mark,
single non-in-line Kai is marked with A1B1,1, etc. [See bacteria 8(a) 6.2.3 For in-line crankshaft internal combustion engines, the semi-plane rotation axis is the center line of all crankshafts, that is, it coincides with the arrow line V pseudo straight code Cx\a+--Single row dynamic internal combustion engine
(b) Single row dynamic internal combustion engine
(d) Single row dynamic internal combustion engine left Figure 13 Vertical vertical internal combustion engine
8.1 In-line internal combustion engine with cylinders above the drive shaft 81.1 In-line internal combustion engine right
In the case of the arrangement described in 4.1:1, the exhaust gas must be located to the right of the centerline plane of the gas red. See 13 () and.
81.2 In-line internal combustion engine
In the case of the arrangement described in 4.1.1, the exhaust gas must be located to the left of the centerline plane of the gas red (see 13 (h) and (d?.
8.2 Cylinders are not located between For the in-line internal combustion engine described in 8.1, the center of the cylinder is not above the driving auxiliary vertical plane. The cylinder axis should be rotated to a vertical position. Then, according to 8.1.1 and 8.1.2, the exhaust pipe is located on the right to mark the internal combustion engine as an in-line internal combustion engine (see Figure 14 (c), (c) and (e) for the left in-line internal combustion engine (see Figure 14 (b), (d) and (i). For the opposing piston internal combustion engine shown in Figure 14 () and (b), the engine drive shaft should be rotated so that the cylinder connected to the exhaust pipe is located in a vertical position above the drive shaft. (e) Single row opposing piston internal combustion engine (e) Single horizontal opposing piston internal combustion engine (GB/T 726-94
b) Single row internal combustion engine (left)
(d) Single row internal combustion engine (left) [f) Single row internal combustion engine (left) Figure 11 Non-vertical cylinder in-line internal combustion engine Additional notes:
GB/T726·-94
This standard was proposed by the Ministry of Machinery Industry of the People's Republic of China. This standard was drafted by the National Technical Committee for Standardization of Internal Combustion Engines. The Shanghai Internal Combustion Engine Research Institute was responsible for drafting the standard. The main drafters of the standard are:
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