CN106402408B - A kind of automatic gear-box solenoid valve - Google Patents

Abstract

A solenoid valve for an automatic transmission disclosed by the present invention includes a valve body with a valve cavity and an electromagnetic coil assembly, the valve body is processed with a hydraulic oil port P and a hydraulic oil port A, and a valve core is installed in the valve cavity of the valve body Assembly, the valve body is a plastic valve body formed by plastic processing, the valve core assembly consists of a steel ball that can form a steel-plastic soft seal with the one-way oil port in the valve cavity, a plastic valve plug and a steel ball for axially pushing the steel ball to open the single valve. It is composed of a ejector rod that connects the oil passage between port P and port A to the oil port; the plastic valve plug is formed with an oil hole, the electromagnetic coil assembly is connected with the valve body through a plastic seal, and the tail end of the ejector rod extends into the solenoid valve. In the coil assembly, the electromagnetic coil assembly controls the push rod to push the steel ball through the combination of electromagnetic force and spring force; the fixed sleeve on the valve body is equipped with a filter screen connector that enables quick plug-in installation of the automatic transmission solenoid valve and the transmission valve plate , The filter screen connector is equipped with a filter screen to filter the hydraulic oil flowing through the A port and the P port.

Description

Solenoid valve for automatic transmission

technical field

The invention relates to a component of an automatic transmission, in particular to a solenoid valve of an automatic transmission.

Background technique

The gearboxes used in automobiles are gradually replaced by automatic gearboxes, especially in mid-to-high-end cars, almost all automatic gearboxes are used. More and more modern vehicle engine electronic control systems tend to choose solenoid valves as actuators, because solenoid valves can directly control fuel injection volume and timing, and part of the fuel injection rate can also be realized by solenoid valves. In this way, the three control items can be completed with only one actuator, which greatly simplifies the hardware of the entire electronic and electronic system. Therefore, the solenoid valve is one of the most important components in the current automatic transmission. On the other hand, the on-off solenoid valve is relatively simple, and the drive control part is far simpler than that of stepper motors, proportional solenoids and other actuators.

The solenoid valve is used as the actuator of the electronic control system of the engine. Its main function is to control the on-off of the oil circuit. The solenoid valve opens and closes frequently during use, which requires good coaxiality between the moving parts. The more moving parts, the more difficult it is to maintain the coaxiality, the more difficult it is to process and assemble, and the higher the production cost of the product. Once the good coaxiality between the moving parts cannot be maintained, the performance and service life of the solenoid valve will be affected, which in turn will affect the performance of the entire engine.

Contents of the invention

The technical problem to be solved by the present invention is to provide an automatic transmission electromagnetic gearbox with simple structure, long service life, low requirements on parts machining accuracy, sensitive response, good stability and fast assembly in view of the current state of the art. valve.

The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a solenoid valve for automatic transmission, including a valve body with a valve cavity in the axial direction and an electromagnetic coil assembly connected with the valve body, and the peripheral surface of the valve body is processed radially There is a hydraulic oil port P connected to the valve cavity. The front cavity of the valve cavity constitutes the hydraulic oil port A. The valve core assembly is installed in the valve cavity of the valve body. The valve body is a plastic valve body formed by plastic processing. The spool assembly consists of a steel ball that can form a steel-plastic soft seal fit with the one-way oil port in the valve cavity, a plastic valve plug for movably positioning the steel ball in the valve cavity, and a plastic valve plug for axially pushing the steel ball to open the one-way oil port. The port is composed of the ejector rod that connects the oil passage between port P and port A; the plastic valve plug is formed with an oil hole, the electromagnetic coil assembly is connected with the valve body through the plastic seal body, and the tail end of the ejector rod extends into the In the electromagnetic coil assembly, the electromagnetic coil assembly controls the push rod to push the steel ball through the combination of electromagnetic force and spring force; the fixed sleeve on the valve body is equipped with a filter screen connection that enables the automatic transmission solenoid valve and the transmission valve plate to achieve quick plug-in installation The filter screen connector is equipped with a filter screen to filter the hydraulic oil flowing through the A port and the P port.

Optimized technical measures also include:

The tail cavity of the above-mentioned valve body and valve cavity is press-fitted with a copper seat that can play an anti-magnetic effect through a plastic seal. A lubricating oil hole for lubricating the ejector rod with hydraulic oil is processed on the seat, and a ejector rod seat that is fitted with the ejector rod to slide through is installed in the plastic package.

An annular sealing groove is processed on the outer peripheral surface of the above-mentioned filter screen connector relatively close to the front end, and the first sealing ring that prevents hydraulic oil from leaking after being inserted into the transmission valve plate is fitted in the annular sealing groove. An annular groove is processed on the outer peripheral surface of the net connector relatively close to the rear end, and a second sealing ring is installed in the annular groove to prevent hydraulic oil from leaking after being plugged and installed with the transmission valve plate.

The above-mentioned electromagnetic coil assembly includes a coil casing, an electromagnetic coil, a moving iron core group and a static iron core; the coil casing is formed with a central stepped hole in the center and an annular assembly cavity surrounding the central stepped hole, and the electromagnetic coil is fixedly installed in the annular assembly cavity , The moving iron core group is slidably arranged in the center step hole, and the static iron core is fixedly installed on the front end of the coil shell.

The front end of the above-mentioned static iron core is connected with the rear end of the plastic package in a liquid-tight and fixed phase, and the center of the static iron core is processed with a slide hole through which the tail end of the ejector rod can slide through in a liquid-tight manner. The iron core group is a detachable phase top connection.

The above-mentioned iron core group is composed of a thick mandrel, a front spring, a rear spring and a moving iron core; In the front section of the thick ejector rod, the rear spring is sleeved on the rear section of the thick ejector rod, and the rear end surface of the ejector rod abuts against the bottom surface of the positioning concave hole formed on the front end surface of the thick ejector rod.

The above-mentioned moving iron core is fixed and set on the thick ejector rod by means of interference fit between the aluminum gasket and the thick ejector rod. The front end of the front spring is connected to the static iron core, and the rear end of the front spring is in contact with the aluminum gasket. Matching, the tail end of the central step hole is provided with a rear spring seat that can adjust the preload pressure of the rear spring. Then match.

The rear end of the above-mentioned electromagnetic coil is connected with an insertion piece for providing power to the electromagnetic coil, and the rear end of the coil housing is provided with a socket cover to provide protection for the insertion piece.

A solenoid valve for an automatic transmission of the present invention, the valve body is made of plastic, the steel ball in the valve body and the one-way oil port of the valve chamber can realize a steel-plastic soft seal combination structure, so the sealing performance is good, and the To ensure the quality of products to the greatest extent. The tail cavity of the valve body and valve cavity is press-fitted with a copper seat through the plastic seal body. The copper seat can play a good guiding role and has good anti-magnetic properties. The valve body of the electromagnetic valve of the automatic transmission of the present invention can also realize fast plug-in installation with the valve plate of the transmission through the filter screen connector installed, so that the installation of the electromagnetic valve of the automatic transmission is more convenient. The magnetic force generated by electrification of the component drives the movement of the ejector rod, and realizes the electromagnetic control of the on-off of the hydraulic oil circuit of the P port and the A port. The ejector rod and the moving iron core set of the present invention are designed in a detachable structure, thus avoiding the defect that the traditional integrated design of the ejector rod and the moving iron core set requires high coaxiality, thereby reducing the processing accuracy of the product and reducing the processing cost .

The invention has the advantages of simple structure, long service life, low requirements on machining precision of parts, good stability and quick assembly, and is especially suitable for BMW 6-speed automatic transmission.

Description of drawings

Fig. 1 is the sectional structure schematic diagram of the present invention;

Fig. 2 is a three-dimensional exploded schematic diagram of the present invention;

Fig. 3 is the three-dimensional structure schematic diagram of the present invention;

Fig. 4 is a schematic diagram of the three-dimensional structure of the copper seat in Fig. 1 .

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Shown in Fig. 1 to Fig. 4 is the structural representation of the present invention,

The reference signs are: valve body 1, valve cavity 1a, one-way oil port 1b, steel ball 21, plastic valve plug 22, ejector rod 23, copper seat 24, copper seat guide hole 24a, lubricating oil hole 24b, ejector rod Seat 25, plastic package body 3, electromagnetic coil assembly 4, coil casing 41, central step hole 41a, annular assembly cavity 41b, electromagnetic coil 42, moving iron core group 43, positioning concave hole 43a, thick ejector rod 431, front spring 432, Rear spring 433, moving iron core 434, aluminum gasket 435, static iron core 44, rear spring seat 45, insert piece 46, socket cover 47, filter screen connector 5, annular sealing groove 51, annular channel 52, the first A sealing ring 61 and a second sealing ring 62 .

As shown in Figures 1 to 4,

A solenoid valve for automatic transmission of the present invention includes a valve body 1 with a valve cavity 1a in the axial direction and an electromagnetic coil assembly 4 connected to the valve body 1, and the peripheral surface of the valve body 1 is radially processed with a communicating valve cavity 1a The hydraulic oil port P port of the valve chamber 1a constitutes the hydraulic oil port A port, and the valve core assembly is installed in the valve chamber 1a of the valve body 1. The valve body 1 of the present invention is a plastic molded by plastic processing. The valve body, the valve body 1 made of plastic can avoid electromagnetic interference, thereby improving the stability of the valve. It can be seen from Figure 1 that a one-way oil port 1b is formed in the valve cavity 1a of the valve body 1 to control the oil passage between the P port and the A port.

The spool assembly consists of a steel ball 21 that can form a steel-plastic soft seal fit with the one-way oil port 1b in the valve cavity 1a, a plastic valve plug 22 for movably positioning the steel ball 21 in the valve cavity 1a, and a Push the steel ball 21 to open the one-way oil port 1b to make the oil passage between the P port and the A port pass through.

The electromagnetic coil assembly 4 of the present invention is integrated with the valve body 1 through the plastic package 3, and the tail end of the push rod 23 extends into the electromagnetic coil assembly 4 in a sealed and sliding manner, and the electromagnetic coil assembly 4 is controlled by a combination of electromagnetic force and spring force. The ejector rod 23 pushes the steel ball 21; the fixed sleeve on the valve body 1 is equipped with a filter screen connector 5 that enables quick plug-in installation of the automatic transmission solenoid valve and the transmission valve plate, and the filter screen connector 5 is equipped with a convection A The filter screen for filtering the hydraulic oil in port and P port.

The biggest advantage of the present invention is that the valve body 1 is made of plastic, so that a good sealing effect can be achieved without installing a gasket between the rigid steel ball 21 and the plastic one-way oil port 1b, and the one-way oil port 1b and the steel ball 21 The formed steel-plastic soft seal fit can maximize the sealing performance of this product. And the present invention can not only filter the hydraulic oil that enters and exits because the filter screen connector 5 is equipped with, but also can realize the plug-in fast installation of product, when automatic transmission solenoid valve and transmission valve plate are installed, only need filter screen The connecting head 5 can be aligned with the installation hole on the transmission valve plate and inserted, so the installation is very convenient without patent tools.

In the embodiment, please refer to Fig. 1 and Fig. 4, the tail cavity mouth of the valve body 1 valve cavity 1a of the present invention is press-fitted with a copper seat 24 capable of antimagnetic effect through the plastic sealing body 3, and the center of the copper seat 24 is processed There is a copper seat guide hole 24a that provides a guiding effect for the axial sliding of the ejector pin 23, and the copper seat 24 is processed with a lubricating oil hole 24b that utilizes hydraulic oil to lubricate the ejector pin 23. The ejector pin seat 25 that cooperates is established. The copper seat 24 is another innovative point of the present invention, and the copper seat structure is designed so that the push rod 23 can be well guided, and it also has good antimagnetic properties.

As shown in Figures 1 and 2, an annular sealing groove 51 is processed on the outer peripheral surface of the filter screen connector 5 of the present invention relatively close to the front end, and the annular sealing groove 51 is clamped with a plug-in type seal with the transmission valve plate. After installation, the first sealing ring 61 to prevent hydraulic oil leakage, the outer peripheral surface of the filter screen connector 5 is relatively close to the rear end, and an annular groove 52 is processed. Finally, the second sealing ring 62 to prevent hydraulic oil leakage. The outer peripheral surface of the filter screen connector 5 is also provided with a filter screen hole that communicates with the P port, and the front end of the filter screen connector 5 is designed with a filter screen hole that communicates with the A port, and the filter screen is designed in the filter screen hole. To prevent impurities in the hydraulic oil from entering the valve body. The first sealing ring 61 and the second sealing ring 62 ensure the tightness of the assembly of the solenoid valve of the automatic transmission.

In the embodiment, the electromagnetic coil assembly 4 of the present invention includes a coil housing 41, an electromagnetic coil 42, a moving iron core group 43 and a static iron core 44; An annular assembly cavity 41b, the electromagnetic coil 42 is fixedly installed in the annular assembly cavity 41b, the moving iron core group 43 is slidably arranged in the central stepped hole 41a, and the static iron core 44 is fixedly installed at the front end of the coil casing 41.

The front end of the static iron core 44 is connected to the rear end of the plastic package 3 in a liquid-tight and fixed phase. The center of the static iron core 44 is processed with a sliding hole for the tail end of the push rod 23 to slide through in a liquid-tight manner. The rear end of the push rod 23 The end face and the moving iron core group 43 are detachably connected to each other.

Iron core group 43 is made up of thick mandrel 431, front spring 432, rear spring 433 and moving iron core 434; The iron core 434, the front spring 432 are set on the front section of the thick ejector rod 431, the rear spring sleeve 433 is installed on the rear section of the thick ejector rod 431, the rear end surface of the ejector rod 23 and the positioning concave hole 43a formed on the front end surface of the thick ejector rod 431 The bottom surface is connected to the top.

The ejector pin 23 and the thick ejector pin 431 of the present invention have a detachable design structure, which avoids the problem of high coaxiality between them during overtime, therefore reduces the precision of product processing and reduces the processing cost.

In the present invention, electromagnetic force can be generated after the electromagnetic coil 42 is energized, and the electromagnetic force acts on the iron core group 43 to drive the ejector rod 23 to move.

The moving iron core 434 adopts the interference fit between the aluminum gasket 435 and the thick ejector rod 431 and is fixedly set on the thick ejector rod 431. The front end of the front spring 432 is connected with the static iron core 44. The aluminum spacer 435 abuts and cooperates, and the tail end of the central step hole 41a is provided with a rear spring seat 45 that can adjust the preload pressure of the rear spring 433, and the front end of the rear spring 433 is connected to the bottom surface of the spring hole of the thick ejector rod 431. The rear end of the rear spring 433 abuts against the rear spring seat 45 to match. The present invention can adjust the pre-tightening pressure of the rear spring 433 through the rear spring seat 45, so as to adjust the pressure for opening or closing the one-way oil port 1b. In the present invention, springs are arranged at both ends of the thick push rod 431, that is, both sides of the moving iron core 434, so that the movement of the moving iron core can be buffered, and this structure can reduce the noise of the valve.

The rear end of the electromagnetic coil 42 is connected with an insert 46 for providing power to the electromagnetic coil 42 , and the rear end of the coil housing 41 is provided with a socket cover 47 for protecting the insert 46 .

The electromagnetic valve of the automatic transmission of the present invention is a normally open switch electromagnetic valve. When the electromagnetic coil 42 is not energized, the push rod 23 is pushed by the thick push rod 431 under the action of the rear spring 433 and the front spring 432 moves to the left after being compressed. Open the steel ball 21 to open the one-way oil port 1b, and conduction between the P port and the A port. When the electromagnetic coil 42 is energized, the moving iron core 434 is compressed by the electromagnetic force and the spring 433 moves to the right, so that the ejector rod 23 moves to the right. Move to the right to close the one-way oil port 1b, cut off the channel between P port and A port, and play a role of switching oil circuit, so as to realize the control clutch.

The invention has the advantages of simple structure, long service life, low requirements on machining precision of parts, good stability and quick assembly, and is especially suitable for BMW 6-speed automatic transmission.

The preferred embodiment of the present invention has been illustrated, and various changes or modifications may be made by those skilled in the art without departing from the scope of the present invention.

Claims (8)

1. A solenoid valve for automatic transmission, comprising a valve body (1) axially provided with a valve cavity (1a) and an electromagnetic coil assembly (4) connected to the valve body (1), said valve body (1 ) is radially processed with the hydraulic oil port P port connected to the valve cavity (1a), the front cavity of the valve cavity (1a) constitutes the hydraulic oil port A port, and the valve cavity of the valve body (1) (1a) is equipped with a valve core assembly, which is characterized in that: the valve body (1) is a plastic valve body formed by plastic processing, and the valve core assembly can be connected with the one-way valve in the valve cavity (1a). The oil port (1b) forms a steel ball (21) with a steel-plastic soft seal fit and a plastic valve plug (22) for movably positioning the steel ball (21) in the valve cavity (1a) and for axially pushing the steel ball ( 21) Open the one-way oil port (1b) to make the oil passage between the P port and the A port through the ejector rod (23); the plastic valve plug (22) is formed with an oil hole, and the electromagnetic coil assembly (4) The valve body (1) is connected as a whole through the plastic seal body (3), and the tail end of the push rod (23) is stretched into the electromagnetic coil assembly (4) in a sealed and sliding manner, and the electromagnetic coil assembly (4) ) through the combination of electromagnetic force and spring force to control the push rod (23) to push the steel ball (21); the fixed sleeve on the valve body (1) is equipped with a quick plug-in installation for the automatic transmission solenoid valve and the transmission valve plate. The filter screen connector (5), the filter screen connector (5) is equipped with a filter screen for filtering the hydraulic oil flowing through the A port and the P port. 2. A solenoid valve for automatic transmission according to claim 1, characterized in that: the tail cavity of the valve body (1) valve chamber (1a) is press-fitted by the plastic seal body (3) to play a role Antimagnetic copper seat (24), the center of the copper seat (24) is processed with a copper seat guide hole (24a) that provides guidance for the axial sliding of the push rod (23), and the copper seat (24) is processed with The lubricating oil hole (24b) of the ejector rod (23) is lubricated with hydraulic oil, and the ejector rod seat (25) is installed in the plastic package (3) to slide through and cooperate with the ejector rod (23). 3. A solenoid valve for automatic transmission according to claim 2, characterized in that: an annular sealing groove (51) is processed on the outer peripheral surface of the filter screen connector (5) relatively close to the front end, and the annular sealing groove (51) is The sealing groove (51) is clamped with the first sealing ring (61) that prevents hydraulic oil from leaking after it is inserted into the transmission valve plate, and the outer peripheral surface of the filter screen connector (5) is relatively close to the rear The end is processed with an annular groove (52), in which a second sealing ring (62) is installed to prevent hydraulic oil from leaking after being plugged in with the transmission valve plate. 4. A solenoid valve for automatic transmission according to claim 3, characterized in that: said electromagnetic coil assembly (4) comprises a coil casing (41), an electromagnetic coil (42), a moving iron core group (43) and static iron core (44); the coil housing (41) is formed with a center step hole (41a) at the center and an annular assembly cavity (41b) around the center step hole (41a), and the electromagnetic coil (42 ) is fixedly installed in the annular assembly cavity (41b), the moving iron core group (43) is slidably arranged in the center step hole (41a), and the static iron core (44) is fixedly installed in the coil casing (41 )Front end. 5. A solenoid valve for automatic transmission according to claim 4, characterized in that: the front end of the static iron core (44) is connected to the rear end of the plastic package (3) in a liquid-tight and fixed phase, and the static The center of the iron core (44) is processed with a sliding hole for the tail end of the ejector rod (23) to slide through in a liquid seal, and the rear end surface of the ejector rod (23) is detachable from the moving iron core group (43). Connect with each other. 6. A solenoid valve for automatic transmission according to claim 5, characterized in that: said iron core group (43) consists of a thick ejector rod (431), a front spring (432), a rear spring (433) and The moving iron core (434) is composed of; the moving iron core (434) is fixedly set on the thick mandrel (431), and the front section and the rear section of the thick mandrel (431) all extend out of the moving iron core (434), so The front spring (432) is sleeved on the front section of the thick push rod (431), the rear spring (433) is sleeved on the rear section of the thick push rod (431), and the rear end surface of the push rod (23) is in contact with the The bottom surface of the positioning concave hole (43a) that the front end surface of the thick ejector rod (431) is shaped on is connected to each other. 7. A solenoid valve for automatic transmission according to claim 6, characterized in that: the moving iron core (434) is fixed by an interference fit between an aluminum gasket (435) and a thick ejector rod (431) Set on the thick ejector rod (431), the front end of the front spring (432) is in contact with the static iron core (44), and the rear end of the front spring (432) is in contact with the aluminum gasket (435). Cooperate, the tail end of described central step hole (41a) is provided with the rear spring seat (45) that can adjust the preload pressure of rear spring (433), the front end of described rear spring (433) and thick ejector rod (431) The bottom surface of the spring hole of the spring hole is abutted, and the rear end of the rear spring (433) is abutted with the rear spring seat (45) to match. 8. A solenoid valve for automatic transmission according to claim 7, characterized in that: the rear end of the electromagnetic coil (42) is connected with an insertion piece (46) that provides power for the electromagnetic coil (42), so The rear end of the above-mentioned coil casing (41) is provided with a socket cover (47) that provides protection for the insertion piece (46).