Transmission connecting rod structure

Abstract

The invention discloses a transmission connecting rod structure. A sliding bearing is installed in a shaft hole in a large-end portion of a connecting rod. The transmission connecting rod structure ischaracterized in that transmission faces in sliding friction fit with a crankshaft are formed in the top and the bottom of the sliding bearing, oil storing grooves concave down are formed in the inner surfaces of the two sides of the sliding bearing, the connecting rod is further provided with a lubricating oil channel communicating with an oil groove in the outer circle face of the sliding bearing, the sliding bearing is provided with a penetrating oil hole communicating the oil groove with the oil storing grooves, and lubricating oil channels for oil return are formed in the two sides of the sliding bearing. Rolling bearings are further arranged on the portions, located on the two sides of the sliding bearing, in the shaft hole of the large-end portion of the connecting rod correspondingly. The lubricating oil channel in the large-end portion of the connecting rod communicates with the sides of the rolling bearings through branches. According to the transmission connecting rod structure, the heat emitting amount is small, the load impact bearing ability is high, and the structure is applicable to a high-speed heavy pressure machine.

Description

technical field [0001] The invention relates to a transmission connecting rod, which is especially suitable for high-speed and heavy-duty presses such as forging presses. Background technique [0002] In heavy-duty mechanical presses such as forging presses, connecting rods are generally used to convert the rotational motion of the crankshaft into the up and down reciprocating motion of the pin (plunger), and the pin (plunger) is generally connected to the slider with fasteners to achieve The reciprocating motion of the slider. [0003] The connecting rod of the press is generally composed of the large end of the connecting rod, the small end of the connecting rod and the connecting rod body. For low-speed presses, sliding bearings suitable for low-speed and heavy-duty are usually used. However, for high-speed precision presses, the big head of the connecting rod in contact with the crankshaft bears high speed and periodic impact loads. When sliding bearings are used (slidi...

AI Technical Summary

Problems solved by technology

However, for high-speed precision presses, the big end of the connecting rod in contact with the crankshaft bears high speed and periodic impact loads. When sliding bearings are used (the sliding bearings are fixed on the big end of the connecting rod), it is easy to cause the wear of the sliding bearings to intensify , so when the sliding bearing is used, the increase of the stamping speed is limited, and it is difficult to meet the speed requirements of the high-speed press; when the rolling bearing is used, although the stamping speed has been improved, the rolling bearing has a service life problem due to its poor ability to withstand heavy load impacts. regular overhaul

There are also rolling bearings and sliding bearings used in combination, and the sliding bearing bears the load during stamping, but there is also an instantaneous load that is too large, and the heat generated by the friction between the sliding bearing and the crankshaft cannot avoid the burning of the sliding bearing, or even abnormal wear.

At the same time, the copper shavings generated during the early running-in process can easily enter the rolling bearing, causing the rolling bearing to burn or even get stuck.

[0004]Considering the convenience of connecting rod assembly, the big end of connecting rod is generally divided into connecting rod cover and connecting rod body, and the connecting rod cover and connecting rod body are made of screws or Bolt connection, and pins are used for positioning. Due to the periodic impact load, it is easy to fail the screw or bolt connection and cause fracture problems.

[0005]The small end of the connecting rod is generally arranged at the geometric center of the connecting rod. Since there is a gap between the small end of the connecting rod and the connecting rod pin, when there is an impact load or an unbalanced load It will cause a large swing of the big end of the connecting rod, which is not conducive to the long-term maintenance of the precision of the hinge

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