CN210978031U - Differential hydraulic pump for commercial vehicle cab turnover system - Google Patents

Abstract

The utility model relates to a differential hydraulic pump is used to commercial car driver's cabin upset system, including check valve, overflow valve, switching-over valve, check valve, overflow valve, switching-over valve are integrated inside the valve plate, and the oil bath is fixed in valve plate one side, and it has three interface to open in the valve plate, wherein two interface connection hydro-cylinders, another interface connection electric pump. Use a commercial car driver's cabin is differential hydraulic pump for upset system, simple structure, with low costs, this oil pump make full use of is differential to lift the principle, controls one in two oil circuits, has reduced the volume and the processing degree of difficulty of switching-over valve, the cost reduction is about 20%.

Description

Differential hydraulic pump for commercial vehicle cab turnover system

Technical Field

The utility model relates to a commercial car hydraulic system power pack, especially a commercial car driver's cabin is differential hydraulic pump for upset system.

Background

In the current commercial vehicle cab turnover system, a manual pump is an indispensable part, and on one hand, distribution and conversion of an oil way are provided, and on the other hand, reliable power output is provided. From the system perspective, the system can be divided into a differential system and a non-differential system. Of the two systems, the differential system is widely used in the cab roll-over of modern commercial vehicles due to the reasons of simple principle, convenient manufacture and the like.

At present, a manual pump reversing valve and a rocker arm are distributed in two different dimensions, the rocker arm is a connecting part for converting external mechanical force into internal pressure of a hydraulic system, and the rocker arm must be preferentially arranged in consideration of convenience in operation during design of a whole vehicle. However, the reversing valve is in the other dimension, which brings serious invariance to operators and also brings limitation to the arrangement of the whole vehicle, and the flexible installation is very low.

Disclosure of Invention

The utility model aims at providing a commercial car driver's cabin is differential hydraulic pump for upset system, with switching-over valve and rocking arm axle design in same dimension, so both made things convenient for the operation rocking arm, improved the installation flexibility again.

In order to solve the technical problem, the technical scheme of the utility model as follows: the utility model provides a commercial car driver's cabin is differential hydraulic pump for upset system which characterized in that: the oil tank is fixed on one side of the valve plate, three interfaces are arranged in the valve plate, two interfaces are connected with the oil cylinder, and the other interface is connected with the electric pump.

The improvement of the technical scheme is as follows: and the plate body of the valve plate is provided with exhaust holes.

The technical scheme is further improved as follows: the reversing valve is internally provided with a one-way valve, and the reversing valve is axially positioned through the size matching of the reversing valve, the cover plate, the gasket, the reversing cylindrical pin and the valve plate, and the reversing valve is radially positioned through the matching of the hole and the shaft.

Has the advantages that:

use a commercial car driver's cabin differential hydraulic pump for upset system, have following advantage:

1. firstly, simple structure, with low costs. The oil pump fully utilizes the differential lifting principle to control one of the two oil ways, reduces the volume and the processing difficulty of the reversing valve, and reduces the cost by about 20 percent.

2. The internal leakage is small, and the function is reliable. Because only one of the two oil paths is controlled, the contact area of the reversing valve and the valve plate is small, and the hard contact surface between metals is reduced, so that the leakage risk is reduced.

3. The installation flexibility is good. The positions of the mounting holes can be on two sides of the valve plate and also can be on the large end surface of the valve plate. The installation mode can be selected at will according to the arrangement of the whole vehicle and the requirements of customers, and the operation is simple.

4. Complete functions and wide application. The lifting can be realized manually and electrically.

Drawings

FIG. 1 is a schematic diagram of a hydraulic pump during lifting of a lifting cylinder.

FIG. 2 is a schematic diagram of an oil outlet path of a hydraulic pump when a lifting cylinder is lifted.

Fig. 3 is a schematic diagram of the hydraulic pump oil return when the lifting cylinder retracts.

FIG. 4 is a schematic diagram of the hydraulic pump return line with the lift cylinder retracted.

FIG. 5 is a schematic axial positioning of the reversing valve.

Fig. 6 is a three-dimensional schematic view of a hydraulic pump.

Detailed Description

As shown in fig. 1-6, a differential hydraulic pump for a commercial vehicle cab tilting system is formed by integrating a one-way valve, an overflow valve (safety valve), a reversing valve and an oil sump on a valve plate to form an integrated hydraulic power unit, thereby realizing a differential oil supply system, being convenient to convert into a single-loop oil supply system for use, and being connected with an electric oil pump to realize electric operation. The method is characterized in that:

the described check valve, overflow valve (safety valve) and change-over valve are integrated in the interior of valve plate, and the oil pool is fixed on one side of valve plate, and can be regulated by change-over valve to implement switching of oil circuit of differential oil supply system.

The internal features of the valve plate are as follows:

the valve plate is internally provided with a connector A, a connector B and a connector C, wherein the connector A and the connector B are connected with the oil cylinder, and the connector C is connected with the electric pump.

The valve plate is internally integrated with a one-way valve in order to realize the smoothness of an oil circuit and prevent rebounding.

The valve plate is internally integrated with an overflow valve (safety valve) in order to adapt to hydraulic systems with different pressure requirements and ensure the safety of the hydraulic systems.

The valve plate integrates a reversing valve in order to realize the switching of an oil circuit of a hydraulic system.

The valve plate is also provided with an exhaust hole in order to reduce the influence of air inside the hydraulic system.

The reversing valve is internally provided with a one-way valve. The functions are as follows: firstly, preventing the hydraulic cylinder from generating bubbles in the system due to the over-high flow speed of hydraulic oil in the retraction process, thereby generating unnecessary damage to the hydraulic system; and secondly, when the oil pipe is broken accidentally, the hydraulic oil is prevented from flowing out from the port A.

The reversing valve is axially positioned by matching the reversing valve, the cover plate, the gasket, the reversing cylindrical pin and the valve plate. The hole shaft is matched to radially position the reversing valve.

The specific content of this patent is as follows:

when the directional valve is in the first position, the hydraulic pump will flow hydraulic fluid out port A, B through the check valve, and extension of the hydraulic cylinder is achieved by the pressure differential between the rod and rodless chambers within the hydraulic cylinder. The schematic diagram of the oil circuit is shown in figure 2.

When the hydraulic cylinder is completely extended out, the oil pump continuously pumps oil, the system pressure is continuously increased, and in order to ensure the safety of the whole hydraulic system, the safety valve (overflow valve) can release pressure.

When the reversing valve is in the third position, the hydraulic pump flows hydraulic oil out of the port B through the one-way valve, the port A of the hydraulic cylinder stops supplying oil, the hydraulic cylinder retracts under the pressure of the rod cavity, and the hydraulic oil in the rodless cavity flows into the oil pool through the port A. The schematic diagram of the oil circuit is shown in figure four.

When the hydraulic cylinder retracts, the one-way valve in the reversing valve can reduce the flow rate of hydraulic oil and reduce air in a hydraulic system. When the hydraulic cylinder is completely retracted, if the hydraulic pump continues pumping oil, the high pressure in the system is released through a safety valve (overflow valve).

In the rotation process of the reversing valve, the reversing valve is axially positioned through the size matching of the reversing valve, the cover plate, the gasket, the reversing cylindrical pin and the valve plate. The hole shaft is matched to radially position the reversing valve.

From the foregoing, it can be readily seen that the present oil pump can be used as a universal replacement for existing differential hydraulic pumps.

By the above, if the port B is closed, the single circuit system can be lifted.

Claims (3)

1. The utility model provides a commercial car driver's cabin is differential hydraulic pump for upset system which characterized in that: the oil tank is fixed on one side of the valve plate, three interfaces are arranged in the valve plate, two interfaces are connected with the oil cylinder, and the other interface is connected with the electric pump.

2. The differential hydraulic pump for a cab-tilting system of a commercial vehicle as claimed in claim 1, wherein: and the plate body of the valve plate is provided with exhaust holes.

3. The differential hydraulic pump for a cab-tilting system of a commercial vehicle as claimed in claim 1 or 2, characterized in that: the reversing valve is internally provided with a one-way valve, and the reversing valve is axially positioned through the size matching of the reversing valve, the cover plate, the gasket, the reversing cylindrical pin and the valve plate, and the reversing valve is radially positioned through the matching of the hole and the shaft.

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