A structure of a cab hydraulic follow-up oil cylinder

Abstract

The invention relates to a structure of a hydraulic follow-up type oil cylinder of a cab. According to the structure, a lower supporting seat (33) is provided with a follow-up long groove (D), a vehicle frame mounting pin (E) is arranged in the follow-up long groove (D), an auxiliary oil pipe is arranged between the upper part of a lower cylinder and the lower part of an upper cylinder so as to communicate the lower cylinder with the upper cylinder, an oil outlet (F) in an intermediate bracket is communicated with a main oil pipe, a one-way valve is arranged at an oil inlet (G) in the intermediate bracket, a control piston (H) is arranged between the oil inlet (G) and the oil outlet (F), the one-way valve comprises a steel ball which is arranged in a valve seat hole and a spring which is abutted against the steel ball, the steel ball is arranged at the junction of the valve seat hole and an oil inlet hole and is in fit seal with the oil inlet hole, the valve seat hole is communicated with an oil chamber (B) through a passage (H), and a jacking head which can be joined the oil inlet hole is arranged on one end face of the control piston and is located in the oil inlet hole. The structure has the advantages that basically-unavailable follow-up section stroke of the existing oil cylinders can be converted into available jacking stroke through acting by two sections of piston rods during jacking, and then, the layout of a whole vehicle is facilitated.

Description

technical field [0001] The invention belongs to the technical field of the automobile manufacturing industry, and relates to an automobile accessory, which is a device for turning and falling back a cab of a car, in particular to a hydraulic turning device for a cab of a commercial vehicle. Background technique [0002] At present, the cab hydraulic tilting cylinders used in domestic commercial vehicles adopt two structures of external follow-up and internal follow-up to reduce the impact of bumpy road vibration on the cab, thereby improving the comfort inside the cab. The internal follow-up mainly uses the size and diameter of the cylinder to realize the floating of the piston rod in the cylinder under the driving state; the external follow-up oil cylinder is designed with a long groove through the upper support or a hinge structure and a cab are installed on the upper support. The bottom is connected to avoid the impact of the oil cylinder on the bottom of the cab. Both h...

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Problems solved by technology

Both have their own characteristics: the internal follow-up structure is compact, but the processing technology is difficult, and the sealing system of the oil port is always in working condition, which is a great test for its sealing performance, and oil leakage often occurs; the external structure of the current structure The follower cylinder is ideal in terms of processing technology and sealing performance, but there are space requirements in the layout of the vehicle, especially the distance between the bottom of the cab and the installation of the frame. If it is hinged, it will be in the driving state. , there will be a certain degree of abnormal noise

[0003] With the development of commercial vehicles towards mid-to-high end, more compact and reliable mechanisms are required. The existing general oil cylinders can no longer meet the needs of future customers. Therefore, a new structure of cab hydraulic tilting oil cylinders is developed to meet customer requirements in advance. We need to consider the design of the current

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