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Heat engine comprising system for varying compression ratio

A heat engine, compression ratio technology, applied in engine control, machine/engine, mechanical equipment, etc., can solve the problems of reducing the mechanical strength of the crankshaft, increasing the processing time, weakening the flange, etc., to improve the mechanical strength, reduce chips, improve The effect of performance levels

Active Publication Date: 2018-08-31
PEZHO SITROEN AUTOMOBILS SA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the problem with this configuration is that, on the one hand, the offset of the meshing plane between the drive gear 4 and the intermediate gear 5 and, on the other hand, the offset of the meshing plane between the intermediate gear 5 and the ring gear 6 requires that The flasque of the crankshaft forms a creuser to join together part of the drive gear 4 and intermediate gear 5, which locally embrittles the crankshaft
[0006] Also, the balancing of the crankshaft may require weakening of the opposing flanges, which also tends to reduce the mechanical strength of the crankshaft
The machining of one or more recesses in the flange also creates a significant amount of machining time, which can generate many chips

Method used

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  • Heat engine comprising system for varying compression ratio
  • Heat engine comprising system for varying compression ratio
  • Heat engine comprising system for varying compression ratio

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Embodiment Construction

[0034] figure 2 It is a side view of the crankshaft 12 integrated with the system 11 for changing the compression ratio, which changes the compression ratio according to the working conditions of the engine. Therefore, the system 11 can operate the internal combustion engine with a high compression ratio under a low load, thereby improving its efficiency. Under high load conditions, the compression ratio can be reduced to avoid working intermittent (à-coup).

[0035] More precisely, the crankshaft 12 of the engine on the X axis is rotatably mounted on the engine housing through a pillow block. The crankshaft 12 includes a plurality of crank pins 13 and a plurality of journals 14 separated by a flange 17 extending substantially perpendicular to the X-axis. The crankshaft 12 also has a front end rotatably connected with the pulley 18. An inertial flywheel (not shown) is rotatably connected to the rear end of the crankshaft 12.

[0036] The eccentric part 21 is rotatably mounted o...

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Abstract

The invention relates to a heat engine comprising a system for varying the compression ratio of the engine, said compression ratio varying system comprising: at least one eccentric part (21) rotatablymounted on a crank pin, said eccentric part (21) comprising an eccentric outer face (25) that co-operates with one end of a rod, as well as at least one ring gear (28); and a device (31) for controlling the angular position of the eccentric part (21), comprising an actuating pinion (33) mounted on an actuating shaft (32), said control device (31) also comprising at least one stepped intermediatepinion (36) having at least first and second steps each formed by a pinion (37, 38), the pinion (37) of the first step meshing with the actuating pinion (33) and the pinion (38) of the second step meshing with the eccentric ring gear (28).

Description

Technical field [0001] The present invention relates to a heat engine including a system for changing the compression ratio, the system being equipped with a stepped intermediate gear. Background technique [0002] The document EP14163870.0 teaches an implementation of a system that changes the compression ratio according to the operating conditions of the engine. This system for changing the compression ratio includes an assembly of eccentric parts mounted on the crank pin so that each assembly is fitted with one end of the connecting rod. [0003] figure 1 The shown control device 1 can adjust the position of the eccentric part 2. To this end, the control device 1 includes a drive shaft 3 and a gear cascade consisting of a drive gear 4 coupled with the drive shaft 3 and the intermediate gear 5. The intermediate gear 5 meshes with the drive gear 4 on the one hand, and meshes with the ring gear 6 coupled to the eccentric part 2 on the other hand. [0004] In operation and when the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B75/04F16C3/28
CPCF16C3/28F02B75/048F02D15/02F16H21/30
Inventor 马修·皮欧格姆朱丽恩·伯杰拉姆伯特斯·汉德瑞克·德·胡德艾尔威廉姆-康斯坦特·瓦根胡尔特桑德尔·瓦格纳尔
Owner PEZHO SITROEN AUTOMOBILS SA