DE2404321A1 - SPEED CHANGE GEAR AND SOLENOID VALVE FOR USE IN SUCH - Google Patents

Description

PATENT AWARDS
Dipl.-Phys. JÜRGEN WEISSE · Dipl.-Chem. Dr. RUDOLF WOLGAST

D5602LANGENBERG BÖKENBUSCH41 9ΑΠΑ321

PostfaA86 Telephone: (02127) 4019 Telex: 8516895

Patent application

Automotive Products Limited

Tachbrook Road, Leamington Spa, Warwickshire, England

Speed change gearbox and

Solenoid valve for use in such

The invention relates to a speed change transmission with a gear reduction gear in which different gear ratios or gear ratios Relationship se are brought into effect by engaging friction clutches and / or applying brakes, so that individual Parts of the gear train are coupled together or held against rotation, in which the clutches are engaged or the brakes are applied by fluid pressure, the is generated by a pump, which sucks liquid from a container and which acts in pressure cylinders, in which "further the supply of pressure fluid to the pressure cylinders through valve means is controlled, which respond to electrical signals, and in which further control means for generating them electrical signals are provided o

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The invention is based on the object of improved valve means for creating such a speed change transmission.

The invention is also based on the object of an improved To provide a solenoid valve for use in a speed change transmission of the type defined above.

According to the invention, this object is achieved in a speed change transmission of the type defined in the introduction in that the valve means comprise solenoid valves to which the electrical Signals are supplied, and that the solenoid valves are arranged so that at least their magnet windings in Liquid are immersed in said container.

The solenoid valves can be switching valves which control the access of a fluid control pressure to slide valves, which in turn control the supply of fluid pressure to the pressure cylinders _{or the like}

The solenoid valves are preferably completely immersed in liquid in the container.

The Sehiberventile contain slides that are slidably guided in bores in a valve block, and the solenoid valves can be attached to the outside of the valve block. Each solenoid valve can contain a cylindrical part, which protrudes beyond one end of the windings of the solenoid valve, and this cylindrical part can be in a valve bore sit and be held in the Ventilbioek.

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According to another aspect of the present invention is a Solenoid valve for use in a speed change transmission the type defined in such a way that the .Magnetventil has a tubular housing which is of a Magnet winding is surrounded and hydraulic fluid connections at both ends possesses, and that the connection between these hydraulic fluid connections by a magnet armature is dominated in the housing.

The armature can be provided with a valve closing body at each end, and one of the valve closing bodies can cooperate with a valve seat when the magnet is excited, while the other valve closing body with another Valve seat cooperates when the magnet is demagnetized.

The solenoid valve can contain two plugs made of a magnetic material with a good relative permeability, which are each fastened in one end of the tubular housing.The two plugs can form a chamber between them in the tubular housing in which a magnet armature slides, which is shaped in this way is that it allows liquid to flow freely by in the chamber. A first and a second channel in a ^ e of the stopper may result in the said chamber and optionally by abutment of the valve closing body of the solenoid armature to the respective valve seats abeperrbar be _0. In one of the plug, a third channel. "be formed, which is constantly in communication with the chamber

The tubular housing can be made in a U-shaped frame be supported by a magnetic material with good relative permeability. One leg of the frame can have a hole,

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through which the tubular housing protrudes. One of Plug may have a reduced diameter portion that extends beyond the end of the tubular housing extends a hole in the other leg. The end of said portion of the plug can be caulked or the like Wise stretched so that the tubular housing is held in the U-shaped frame.

The two stoppers made of magnetic material can also be connected to one another be connected by a tube made of a magnetic material with good relative permeability, which is the magnet winding surrounds.

The first and the second channel can be coaxial bores in the respective plug, of which the first is a through hole and the second is a blind hole leading to a radial hole. The third channel can be from an or a plurality of longitudinal grooves may be formed in the plug in which the second channel is formed.

The magnet armature can be provided with grooves or bores which connect between the hydraulic fluid connections at both ends of the housing.

The invention is explained in more detail below using exemplary embodiments with reference to the accompanying drawings:

Pig. 1 is a cross section through a speed change gearbox, in which the invention is embodied.

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Pig. 2 is a longitudinal section through an embodiment of a solenoid valve according to the invention.

Figure 3 is an end view of the solenoid valve shown in Figure 2

FIG. 4 is a longitudinal section similar to FIG. 2 through another embodiment of one according to the invention Solenoid valve o

Fig. 5 is an end view of the solenoid valve illustrated in Fig. 4, and

FIG. 6 is a side view, partly in section, showing a solenoid valve corresponding to that in FIG Fig. 2 shown together with a slide valve, the solenoid valve as a switching valve serves to control the gate valve.

Speed change transmissions of the type mentioned in the opening paragraph are known and therefore it is not a detailed description such a speed change gear is required. In such a speed change transmission contains bevel gear groups mounted on a carrier © The bevel gear of the groups meshes with bevel gears, the are mounted coaxially to the carrier o There are friction clutches provided, through which an input shaft or an output shaft with selected bevel gears can be coupled, and there are Band brakes provided through which components of the back gear, for example certain bevel gears and the Blanetenradträger is held against rotation. The optional engagement of the, clutches and the application of the brakes provides the various

409834/0740

Gear ratios in the gearbox. With the speed change gearbox According to the invention, the clutches are engaged and the brakes are applied, as in many known ones Systems, through fluid pressure acting in pressure cylinders. Since the invention relates only to the valve mechanism, by which the supply of pressure fluid to these pressure cylinders is controlled, the pressure cylinders are not described here or shown.

In Fig. 1, the Yorhafte is mounted in a housing 10, which is open on its underside. The outline of the intermediate gear is through the dash-dotted circle 11 is shown.

The open underside of the housing 10 is closed by a sump 12 which is connected to the said housing along its belt is screwed. Suitably attached to said underside of the housing so that it is within the sump is a valve block 13 with a plurality of adjacent Bores, one of which is denoted by 14 in FIG. 6. In each of these holes there is a valve slide guided.

Aligned with each bore H outside the valve block 13 a solenoid valve 16 is arranged. The sump contains a liquid which, when carried by a pump (not shown) under Pressure is applied to actuate the pressure cylinders through which the clutches are engaged and the brakes that control the transmission. The access of liquid to the said pressure cylinders is controlled by the slide valves 15, which in turn are actuated by said fluid pressure, each slide valve controlled by one of the solenoid valves 16 “The supply of electrical Electricity to the solenoid valves can automatically follow

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Depending on the speed and load changes of a vehicle, in which the gear is installed, can be controlled, or it can be controlled manually ₀

In Fig. 2 of the drawings, the solenoid valve 16 includes a non-magnetic metal tube 17, expediently made of aluminum, which forms a coil core for a solenoid 20. In one end of said tube 17 sits a plug 18, which from consists of a magnetic material with good relative permeability, expediently made of soft iron, and has a through hole 17. The plug 18 has sections at both ends 21, 22 of reduced diameter. Such a section 21 protrudes from the end of the aluminum tube 17, and the plug 18 is held in the tube 17 by the fact that the material of the tube 17 at 13 in a circumferential groove around the one Larger diameter central part of the plug 18 is pressed around. At the end of the plug 18, which is within ' of the tube 17, the end of the bore 19 in said plug is shaped into a frustoconical shape 24.

A second plug 25 made of a magnetic material with good relative permeability is similarly in the other End of the tube 17 attached. This second plug has a diametrical bore 26, which is expediently in the circumferential groove opens into which the tube 17 is deformed to hold the plug 25 · An axial blind hole 27 connects said diametrical bore with the inner end of the plug »The axial blind bore 27 is at said inner end of the plug drilled out, so that a frustoconical shoulder 28 in the transition is generated between the axial bore 27 and the counter bore. In the second plug 25 longitudinal grooves 29 (lig. 3) are formed, extending from one end of the same to the other

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and form channels which from the chamber 31 in the tube 17 between lead the two plugs 18 and 25 to the outer end of said tube. The pipe 17 is provided with openings, which are aligned with the ends of the diametrical bore 26. In the chamber 31 in the tube 17 between the two plugs 18 and 25 is a magnet armature 32, preferably made of steel, slidably mounted, which is provided with longitudinal grooves 33 which have a free Allow pressure medium passage between the two plugs »at its end adjacent to the first-mentioned plug 18 has the magnet armature 32 has a part 34 of somewhat reduced diameter, the end of which essentially converges to a point 35, so that it is in the frustoconical end 24 · of the bore 19 can come to sit in this stopper and form a conclusion. An oscillating compression spring 36 made of non-magnetic Material which reduced the part 34 of reduced diameter of the magnet armature 32 and the part 22 adjoining it Surrounds diameter of the first stopper 18, pushes the magnet armature away from this stopper.

A protruding from the other end of the armature 32 pin 37 has a conical end 38 which in the counter bore in the Enter the second plug 25 and in the axial blind hole 37 come to sit on and complete this hole.

The tube 17 is in a U-shaped frame or yoke 39 made of a magnetic material with good relative permeability, expediently Mild steel held. The two handles of the frame have aligned holes 41, 42. The hole 41 is large enough to to accommodate the tube 17, and the other hole 42 is smaller. The second hole 42 has such a size that it is the above outer end 21 of the first plug can accommodate «, Das Metallrohr fc can therefore be inserted through the larger hole 41 until

409834/0740

the full diameter portion of the first plug 18 on the Leg of the frame with the smaller hole 42 comes to rest. The thinner end portion 21 of the first plug is then caulked or otherwise stretched against the outside of the leg, as shown at 43, around the ear 17 in to keep his position. The other end of the tube 17 closed by the second plug 25 protrudes from the frame 29 out, so that the part of the tube receiving this second plug is inserted into one end of a bore 14 in the valve block 13 can be as shown in Mg. 6 · The solenoid valve 16 is attached to the valve block by a flat rectangular Clamping plate 44 fixed, which is inserted into a bore 14 inclined slot 45 in the valve block and in a Transverse slot 46 engaged in the plug 25 of the solenoid valve The slot 46 is closed by a cover plate 47, which the area of the valve block in which this slot opens, abdeokt, and the clamping plate 44 is by a spring ring 48, which is inserted between the valve block 13 and the frame 39, is held firmly in contact with one side of the slot 45

The valve slide of the slide valve 15 is, when the solenoid valve 16 is demagnetized, by a leather 49 in the in fig. 6-illustrated position, in which a groove 51 in the slide connects a channel 52 leading to the associated pressure cylinder with an outlet channel 43. A protruding part on the slider covers a pressure supply port 54 from ₀ Another pressure supply port 55 is open to the diametral bore 26 in the plug 25 of the solenoid valve. However, since the conical end of the pin 37 of the armature 31 is on its seat, liquid from the supply connection 55 cannot reach the chamber 3I. The end adjacent to the solenoid valve 16

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of the valve slide 15 is connected to the outlet via the said solenoid valve 16.

When power is applied to the solenoid coil 20, the magnet armature is moved and blocks the channel 19 while the bore 27 is opened, so that pressurized fluid can pass from the supply connection 55 through the bore 27 and the channels 29 into the valve bore 14 and to the adjacent end the slide of the Sohieberventils can act 15, so that it is moved to the left in Figure "6 and the outlet channel 53 shuts off, while the channel 52 is connected to the supply port 54 ₀ thus, it is connected to the associated printing cylinder to the pressure fluid supply, so long as the solenoid valve is excited «.

Because the excitation coil 20 of the solenoid valve 16 is completely immersed in liquid in the sump 12, a significant larger current can be passed through the solenoid valve without excessive heating than it could be passed through if the magnet were surrounded by air. It has been found experimentally that the heat dissipation is increased by a factor of four, which means the use of much smaller magnets to achieve a given valve actuation performance permitted, also in view of the fact that the liquid in the container during the operation of the Transmission can assume a temperature that is significantly above the surrounding air. Another benefit of immersion The solenoid valve in the liquid in the sump consists in that all leakage fluid from the valves goes directly into the sump runs back and no leakage fluid is lost

Figures 4 and 5 show modified embodiment of solenoid valves according to the invention, which the need for a

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Avoid the return spring acting on the solenoid armature of the valve.

• In Fig. 4 and 5 is a tube 27 made of non-magnetic material, which forms a coil core for a magnetic coil 58, closed at one end with a first plug 59, the one having an externally threaded part 61. This part protrudes from the end of the tube 57 · The protruding part 61 receives an internally threaded threaded bushing 62 which abutted against a sealing washer 63 at the end of the tube 57

In the other end of the tube 57 sits a sleeve 64 made of a magnetic one Material with good relative permeability »The sleeve 64 has an outer flange 65 between its ends. This Flange 65 rests against a sealing washer 66, which lies between this and the end of the tube, so that the sleeve 64 over the pipe 57 protrudes. An elongated plug 67, hereinafter referred to as the second plug, made of a magnetic one Material is made with good permeability, sits in the sleeve 64 and has a coaxial bore 68, which is closed at its outer end at 69 and ends in a valve seat 71 at its inner end to the bore 68 connected by a radial channel 72 to the outside of the sleeve 64 on the outside of the flange 65. The radial channel is provided in a tubular insert 73 which is inserted into corresponding holes in the sleeve 64 and the plug 67 is*

A tubular jacket 74 made of a magnetic material with Good permeability surrounds the magnet winding 58 and extends between the flange 65 on the second plug 67 and the Bushing 62. The jacket is attached to flange 65 and bushing 62 in any suitable manner, e.g.

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as shown, its ends are crimped over at 70, or by he in circumferential grooves in the flange 65 and the bush 62 is pressed in. "The first plug 59 is tubular and has a transverse partition 75 in the area of its outer Finally, the partition 75 is provided with a central hole 76 and carries a tubular sleeve 59A of non-magnetic material which is centered in the pin 59 so that it rests against the partition 75

A magnetic armature 77, which is slidably mounted in the bore of the tubular sleeve 59A has tapered ends 78 and 79 on the valve seat 71 in the second plug or _o a second valve seat come to rest, the inner end of the hole 76 in the partition 75 of the first plug 59 is formed "A sloping bore 81 in the magnet armature 77 connects a chamber 82 between the two plugs with a chamber 83 which is formed between the partition 75 and the adjacent end of the magnet armature 77". The armature 77 is axially movable to a limited extent, so that it rests against only one valve seat at a time. Its axial mobility is adjustable by screwing the first plug 59 inwards or outwards in the bushing 62 _e

A channel which, as shown, starts from a flat 84 the surface of the second plug 67 connects the chamber 82 to the opposite end of said Plugging. This channel can also be of a straight or helical hat in the outer surface of said Plug 67 be formed.

In this embodiment of the solenoid valve, the radial channel 72 is connected to the pressure supply, and the hole 76 in the partition wall of the first plug 59 is connected to the outlet.

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The solenoid valve has a valve block as described above Connected in the same manner as the solenoid valve 16 described above.

When the magnet winding 58 is energized, the magnet armature 77 is pushed to the left in FIG. It thus allows the slide of the associated slide valve to assume the position shown in FIG. 6 and to separate the associated pressure cylinder from the pressure fluid supply. When the magnet winding is demagnetized, the pressure fluid supply at the hole 71 moves the magnet armature 77 to the right and opens the channel 68 to the chamber 82, whereby this chamber is connected to the chamber 83, so that the fluid pressure acts on the valve slide and its position changes. As a result, pressure fluid is let into the associated pressure cylinder. In the case of the figure «. 4 and 5 illustrated embodiment of a solenoid valve, the magnet is thus excited when it is not necessary to let pressure fluid into the associated pressure cylinder, and the magnet is demagnetized when pressure fluid is let into this pressure cylinder so H ₀

While in the arrangements according to the invention, which are described above, the solenoid valves and the slide valves, to which these are assigned, completely immersed in the liquid in the sump of the speed change gearbox are, the invention also encompasses an arrangement in which only the parts of the solenoid valves that are controlled by the solenoid windings are surrounded, are immersed in the liquid, while the protruding parts of the second stopper of said mag- - netventile for example through a wall of the sump

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hindurehragen and are connected to the slide valves arranged outside the sump.

Although it is advantageous to use the solenoid valves as switching valves for controlling the liquid supply to the pressure cylinders Using master control valves, they can also be used to directly supply fluid to the pressure cylinders to control.

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Claims (1)

Claims / ί 1.) Speed change gearbox with a gear reduction, at which different transmission or reduction ratios be brought into effect by engaging friction clutches and / or applying brakes, so that individual Parts of the gear reduction are coupled together or held against rotation, in which the clutches are engaged or the brakes are applied by fluid pressure generated by a pump, which fluid sucks from a container, and which acts in pressure cylinders, in which further the supply of pressure fluid to the Pressure cylinders is controlled by Yentilmittel, which respond to electrical signals, and which continues Control means for generating these electrical signals are provided, characterized in that the valve means Solenoid valves (16) comprise, to which the electrical signals are fed, and that the solenoid valves (16) so are arranged so that at least their magnetic windings (20, 58) are immersed in liquid in said container (12) are ο 2 · Speed change gear according to claim 1, characterized in that the solenoid valves (16) switch valves are, which control the access of a fluid control pressure to slide valves (15), which in turn control the Controlling the supply of fluid pressure to the pressure cylinders «, 409834/0740 Speed change transmission according to Claim 1 or 2, characterized in that the solenoid valves (16) are in the Container (12) is completely immersed in liquid. Speed change transmission according to claim 3, characterized in that the slide valves (15) slide included, which are slidably guided in bores (H) in a valve block (13), and that the solenoid valves (16) are attached to the outside of the valve block (13). 5 · speed change transmission according to claim 4 * thereby characterized in that each solenoid valve (16) includes a cylindrical portion extending over one end of the coils (20, 58) protrudes, and that this cylindrical part is seated in a valve bore (H) in the valve block (13) and is held. Solenoid valve for use in a speed change transmission according to claim 1, characterized in that the solenoid valve (16) has a tubular housing, which is surrounded by a magnetic swing (20, 58) and hydraulic fluid connections at both ends possesses, and that the connection between these pressure • * fluid connections from a magnet armature. (32, 77) in the housing is dominated _o Solenoid valve according to Claim 6, characterized in that the magnet armature (32, 77) has a valve closing body (? *>, 38, 78, 79) is provided at each end and one of the 409834/0740 Valve closing body (35, 78) cooperates with a valve seat (24, 71) when the magnet is excited, and the other Valve closing body (38, 79) with a different valve seat (28) cooperates when the magnet is demagnetized. 8 · Solenoid valve according to claim 7, characterized in that the solenoid valve (16) two plugs (18 and 25) (59 and 67) made of a magnetic material with a good relative Contains permeability, which are each fixed in one end of the tubular housing that the two plugs (18 and 25, 59 and 67) form between them a chamber (31, 82) in the tubular housing in which a magnet armature (34, 77) which is shaped so that it allows a free flow of liquid in the chamber (31, 82), that a first and a second channel in each of the plugs (18 and 25, 59 and 67) into said chamber (31, 82) and optionally by contacting the valve closing bodies (35, 38, 78, 79) of the magnet armature (34, 77) can be shut off at the respective valve seats (24, 28, 71), and that in one of the plugs (25, 67) a third channel is formed, which is constantly with the chamber (31, 82) in communication. 9β solenoid valve according to claim 8, characterized in that that the tubular housing in a U-shaped frame (39) made of a magnetic material with good relative Permeability is supported that one leg of the frame (39) has a hole (41) through which the tubular Housing protrudes so that one of the plugs (18) has a section (21) of reduced diameter, - 18 A09834 / 0740 which extends beyond the end of the tubular housing through a hole (42) in the other leg, and that the end of said portion (21) of the plug (18) caulked or similarly stretched, so that the tubular housing is held in the U-shaped frame (39). 10. Solenoid valve according to claim 8, characterized in that the two plugs (18 and 25, 59 and 67) made of magnetic Material connected to one another by a tube (17) made of an aagnetic material with good relative permeability which surrounds the magnet winding (20, 58). ο Solenoid valve according to claim 8, characterized in that the first and second channels are coaxial bores (19 and 27) in the respective plugs (18 and 25), of which the first is a through hole (19) and the second is a blind hole (27) which leads to a radial hole (26) leads, and that the third channel is formed by one or more longitudinal grooves (29) in the plug (25), in which the second channel 27 is formed. 12o solenoid valve according to one of claims 6 to 11, characterized in that the magnet armature (34, 77) is provided with hats or holes which establish a connection between the pressure fluid ports at the two ends of the housing ₀ 409834/0740 Blank page