Electromagnetic reversing valve and valve body thereof

Abstract

The invention relates to an electromagnetic reversing valve and a valve body thereof. A filter oil outlet of the valve body and a filter oil inlet of the valve body as well as a filter oil output runner and a filter oil input runner are formed in the valve body, and a filter is fixedly connected to the valve body; the filter oil inlet of the valve body communicates to a second oil duct through a filter oil input runner; the filter oil outlet of the valve body communicates to the oil inlet through the filter oil output runner; a filter element is fixedly connected to an shell base, and an oil inlet of the filter and an oil outlet of the filter are formed in the shell base; the oil inlet of the filter is opposite to the filter oil outlet of the valve body; the lower part of a center hole ofthe filter element communicates to the oil inlet of the filter; and a bypass valve is arranged between the upper part of the center hole of the filter element and the inner wall of a top cover of theshell. According to the electromagnetic reversing valve, an oil filter is mounted on the valve body, so that the electromagnetic reversing valve is more conveniently cleaned; the dirt volume of the oil filter is greater; the maintenance interval time can be very long; as the oil filter is provided with the bypass valve, fetal failure is avoided when the quantity of pollutants is relatively great.

Description

technical field [0001] The invention relates to an electromagnetic reversing valve, in particular to an electromagnetic reversing valve for engineering vehicles and a valve body thereof. Background technique [0002] The engineering vehicles described in the present invention include forklifts, tractors, loaders and the like. [0003] The electromagnetic reversing valve used by existing engineering vehicles includes a valve body, a valve core and an electromagnet assembly. Assembled with the electromagnet assembly and communicated with the inner cavity of the electromagnet assembly, the valve body includes three oil passages and an oil return passage, and the three oil passages are connected to the first oil port, the second oil port and the oil inlet respectively. The oil return port is connected with the oil return passage, and the three oil passages and the oil return passage are connected with the main hole of the valve body. The existing oil return passage is not only ...

AI Technical Summary

Problems solved by technology

[0003] The electromagnetic reversing valve used by existing engineering vehicles includes a valve body, a valve core and an electromagnet assembly. Assembled with the electromagnet assembly and communicated with the inner cavity of the electromagnet assembly, the valve body includes three oil passages and an oil return passage, and the three oil passages are connected to the first oil port, the second oil port and the oil inlet respectively. The oil return port is connected with the oil return passage, and the three oil passages and the oil return passage are connected with the main hole of the valve body. The existing oil return passage is not only used as an oil return passage for pressure oil circulation, but also as a The oil pressure balance passages at both ends of the spool, when the pressure oil returns through the oil return channel, the pollutants contained in the pressure oil will enter the inner cavity of the electromagnet assembly, and the pollutants will be released under the action of the residual magnetism of the electromagnet assembly. , accumulated for a long time, it is easy to block the inner cavity of the electromagnet assembly, making the electromagnet assembly invalid; It is difficult for the car to climb uphill, and the car slides downhill. If the car is driven in a high gear on flat ground, it is easy to fail to brake the car, which may cause major safety accidents

The electromagnetic reversing valve in the prior art also has the disadvantages of short service life, weak anti-pollution ability, poor reliability, etc.

[0004] In the past, the electromagnetic reversing valve used a sheet filter when filtering pollutants, and the sheet filter was embedded between the control valve and the solenoid valve, which was inconvenient to assemble and disassemble, and dirt was easily brought into the oil of the control valve during assembly and disassembly. hole and the oil hole of the solenoid valve, but will aggravate the pollution of machine parts

When it is necessary to check the oil filter, the solenoid valve must be removed first, and when returning to the original state, the four bolts installed on the solenoid valve have a sequence of tightening and installation torque requirements, which is very inconvenient in use

More critical technical issues: There are such defects in the sheet filter: 1. The total amount of dirt contained is small, and frequent inspection and cleaning are required, and the maintenance interval is short. In fact, it is difficult to maintain frequently in use, and the time is long If the electromagnetic reversing valve is easy to change gears, it is easy to fail. Since the sheet filter is located at the oil inlet of the solenoid valve, if there is a slight blockage of dirt, the loss of pressure and flow will be great; 2. The sheet filter has no bypass Valve, when the sheet filter is completely blocked by pollutants, no oil can enter the oil inlet of the solenoid valve, and the solenoid valve will completely fail

Images