JPS60502013A - Pressure medium operated switching device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Pressure medium operated switching device 〔Technical field〕 The present invention relates to a switching device for a gear transmission.

[Background technology]

In switching devices for gear transmissions in automobiles, etc., the selection of the switching path is performed using the gear shift lever. - is displaced at right angles to the running direction, and gear changes are performed by moving the The displacement is carried out in the backward direction.

In that case, the gear lever located within range of the driver will not be able to change the gear. All necessary transmission functions are provided, which are located in the transmission and act on the switching shaft. It is transmitted to the selection cylinder and the switching cylinder via a pressure medium.

(e.g. only as a main transmission or expanded with a group transmission or (formed as a multi-stage transmission with split groups) Depending on the type of installation, the desired switching must be transmitted via a pressure medium. In addition to automatic transmissions, as is known from mechanically switched transmissions, Such switching requires a position signal that the driver can sense about the switching state of the body. Very strict conditions are imposed on the exchange.

Such a switching device, for example pneumatic, is described in British Patent No. 1,179,426. This is known as the HH-type gear shift device and eight forward and reverse gears. It has a gear lever that can be switched using a ratchet groove based on a switching pattern. Switching The ratchet consists of two ratchet cylinders and a rocker depending on the position of the switching clutch. Acts on the manual switching lever via the dynamic link, and the position signal of the engaged gear is switched. It is generated mechanically in the cylinder via a switching valve.

Such devices fully meet the requirements imposed on switching devices in modern transmissions. and require many connecting pipes for selection and switching. very expensive to manufacture and design.

[Disclosure of the invention]

The object of the invention is to develop the switching device according to the preamble of claim 1. , to simplify operation.

This object can be achieved by the measures specified in the characterizing part of claim 1.

Arrangement of the transmitting shaft and cooperation with said transmitting shaft in the transmission changeover device within the driver's range The 3/2 (3-bottom, 2-position) directional control valve allows the intended switching The desired signal can be easily transmitted to the pressure medium, which allows the source to be The switching axis in the theoretically known transmissions can likewise easily be connected to the selected cylinder and the switching shaft. Adjusted via Linda. This arrangement provides security for the selection of switching paths. The entire device can also be easily placed. In particular, there is a 3/2-way control valve and control on the transmitting shaft. By arranging the control cam, three positions can be selected from the five switching paths of the HH type switching diagram. It is also possible to convert the three necessary switching channels in the main transmission via the cylinders. advantageously, the switching shaft only has a switching finger for displacing the switching rod. Just need it. A 3/2-way control valve is placed on each of the transmission shaft and switching shaft. It is also advantageous to do so. Acts movably as a piston and controls on the switching axis In conjunction with the 3/2-way control valve that cooperates with the cam, a position signal is obtained that can be sensed by the driver. It is possible to use a simple two-position switching cylinder for three switching positions. You can also

The present invention can be advantageously constructed based on the descriptions of claims 2 to 12. .

Based on claims 2 and 3, a multistage running in the circumferential direction on the switching shaft 3/2 direction configured to be movable in the radial direction as a piston with respect to the control cam of The form of the control valve is designed to meet the required functions, has a simple structure, and is easy to manufacture. This function is performed by a shuttle valve located in the same control block according to claim 4. replenished by. Claims between the 3/2-way control valve and the two-position switching cylinder The use of pressure pursuant to Section 4 of the Act may be applied in a transmission changeover device in conjunction with a piston device. This makes it easy to recognize the end of synchronization and the engaged gear position. .

Based on claim 5, two 3/2-way control valves and a circle cooperating therewith A control cam on the circumferentially extending transmitter shaft allows highly discrete adjustment of the switching shaft. adjustable position, three switching positions and reliable for tilting drivers as in the case of purely mechanical switching. A real synchronization point can be obtained as a control pressure in the position signal.

The selection device in the form according to claims 6 and 7 can easily be used as a selection device. The three-position selection cylinder has a smooth hole with no steps up to the stopper ring. are doing.

This packaging of pressure medium operated switching devices Shifting and split group switching are common with the shift lever on the gear shift lever. Since it can be done through Sections 8 and 9).

For example, in a transmission with a known clutch actuation mechanism via an operating pedal. , the 3/2-way control valve is simply connected to this actuator, so the clutch is disengaged. Pressure media can be used for regulation only if

In the case of a gear transmission according to claim 11 having a converter switching clutch If the disconnection and actuation of the converter bridge clutch are activated by the shuttle in the control block, It can be used with particular advantage since it can be carried out with respect to the pressure applied after the valve. Thereby The generally known pressure switch in WSX control is omitted, and the shift lever is Pressure piping to the piston device switches between the pressure medium source and the 372 directional control valve. It is utilized for the second function with the valve being omitted at the same time. Furthermore, claim 1 Based on item 2, a piston that easily cooperates with the transmission shaft and a driving pin is provided in the transmission switching device. ton device can be arranged, in which case this device is especially suitable for multi-speed transmissions. Not only does it allow the driver to optimally operate the transmission, but it also allows the driver to facilitates shifting in connection with finding a new gear, thereby allowing the driver to It is possible to control the valve very carefully and there is no need to over-inject.

[Brief explanation of the drawing]

Figure 1 shows the gear shift device with the gear lever and the 3/2 direction located on the transmission shaft. A schematic system diagram of a control valve, Fig. 1A, shows a control valve arranged in a gear transmission, especially in the area of the switching shaft. Schematic system diagram of the device, Figure 2 shows a gear transmission as a multi-speed changeover device with a device for changing gears. Fig. 3 is a plan view of the gear transmission shown in Fig. 2, and Fig. 4 is a side view of the gear transmission shown in Fig. 2. Schematic diagram of the piston device in Figure 5 shows the relationship between the switching valve input and the gear stage, and Figure 7 shows the gear shift in Figure 6. A partial sectional view of the switching device seen from the running direction, Figure 8 is a plan view of the speed change device with a piston, and Figure 9 is a plan view of the gear shift device with a piston. Shows the switching figure and the spectral force (threshold) in the switching direction and selection direction. An explanatory diagram, Figure 10 shows the relationship between engine speed and transmission output shaft speed due to gear change. FIG.

[Best mode for carrying out the invention]

In Fig. 1, for example, a shift lever 2 of a transmission shaft 3 is placed in the driver's cab of a car. The transmission switching device 1 and all 3/2 directional control valves operated by the transmission shaft 3 are shown. has been done. When using the gear transmission 5, the driver may, for example, The clutch is disengaged by the main clutch, which is actuated directly via the front pedal. In this case, a pressure medium, For example, air is supplied from the pressure medium source 4 via the switching valve 41 . The transmission axis 3 is In the case of a multi-stage transmission, for example, five selection positions (switching path 31 ), and there are three switching positions (neutral position; gear L, 3.5.7: gear R1). 2, 4, 6, 8) are directly rotated according to the HH type switching figure. About selective exercise Two 372-way control valves 11.12 arranged next to each other are arranged in the axial direction of the transmitting shaft 3. With the control cam 32 extending in the direction, the piping I and the piping ■ are controlled as shown in the following table. The pressure medium is regulated to be supplied or discharged.

Switching passage position Piping I Piping ■ When switching from switching channel 3/4 to switching channel 5/6 or vice versa, another control is required. Via the control cam 33, through the piping ■ and piping ■ and the group switching cylinder 55. Selective switching of 372 directional control valve for group transmission switching is performed (Figure 1A).

Two further 372-way control valves 15, 16 are arranged circumferentially next to each other on the transmitting shaft 3. These 3/2 directional control valves 15 and 16 are used to control gear shifting. The cam 34 allows the gear shift lever 2 to move in both 372 directions at the neutral position H. The pipe piece and pipe y through which the control valve 15.16 flows and which leads to the control block 7 The pressure medium is supplied to the The main pressure piping 42 has a ratchet series. The ratchet cylinder 43 is connected to the ratchet cylinder 43 when the main pressure pipe 42 is emptied. , the switching direction (rotation) of the transmission shaft 3 and the gear shift lever 2 is always direction).

In conjunction with the switching movement, a piston device 21 is also arranged on the gearshift lever 2, which piston During the switching process, pressure medium is supplied to the switching device 21 via the pipe Therefore, it is possible to adjust the shift lever 2 to the switching position 22 or 23. (impingement of the respective piston 24 in the casing 17 of 1). Main transmission 51 Only when the switching in is completed and the pressure in the piping The speed lever 2 is placed in the corresponding gear position 25,26. The gear transmission 5 If there are nine split groups 53, as in the embodiment shown in FIG. The GV-valve on the gearshift lever 2 via the bar 27 can input this group (configuration Tube%’ri.

Pipes I to ■ are connected directly or via a clutch device to the first As shown in Figure A, it is guided to a device arranged in the gear transmission 5.

The pipe I is connected to one piston chamber (for example, the left chamber 61) of the three-position selection cylinder 6, and and piping ■ lead to the other piston chamber (right chamber 62), in which case both piping A safety valve 91 is disposed at each of the two. These safety valves 91 cooperate with the switching shaft 9. and is switched to the through-flow position only in its neutral position, thereby causing gear change. The axial direction (selection direction) of the switching shaft 9 in the speed device 5 can be adjusted only in this position. can.

The three-position selection cylinder 6 has an inner pin firmly connected to the casing 63 and the switching shaft 9. This piston 64 has a large diameter collar 640 in the axial middle. are doing. Two identical piston bushes 65 are placed on the left and right sides of the collar 640. 40 and has the same length as the inner piston 64.

62 are arranged, and their axial length is equal to 1/2 of the switching passage in the switching shaft 9. Passage distance between passage R and passage between switching passage 1/2 and switching passage 3/4 It corresponds to the distance.

In the same diameter hole in the casing 63, an inner piston 6 is inserted axially in the middle. A stopper ring 66 having the same width as the collar 640 in 4 is disposed and This restricts the movement of the tush 65 in the axial direction. Stopper ring 66 and collar 64 The free space 67 between 0 and 0 is constantly evacuated.

The three-position cylinder 6 operates as follows.

The switching shaft of the switching shaft 9 at the intermediate position (1/2 switching path in the main transmission 51) The finger is connected to a switching swing link for gear switching clutch 1/2. is engaged with the torque rod. Both piston chambers 61, 62 are filled and in the intermediate position is fixed in relation to a stopper ring 66 via a piston pusher 65. child As shown in the table, the switching state is as shown in the table. Occurs in certain situations. When the piston chamber 62 is discharged (in the sending cylinder 3. switching passage R), the inner piston 64 moves to the right as far as it will go, in which case the cover The roller 640 carries the right piston pusher 65R. The switching shaft 9 is the switching passage R. The position will be

When the left piston chamber is evacuated, the inner piston 64 absorbs the pressure within the piston chamber 62. The collar 640 is moved to the left until the stop by the piston on the left side. Take Bushu 60L with you. This switching state includes switching passage 3/4 and switching passage 7. /8 corresponds to the passage position of the transmission shaft 3, and the switching shaft 9 corresponds to the switching passage 3/'4 of the main transmission. becomes. Control cam 32 via three-position cylinder 6 from five switching passages and three switches of the main transmission 51 in connection with both 3/2-way control valves 11.12. An exchange path is provided.

The control block 7 consists of a switching shaft 9, which has two polygons running in the circumferential direction. Stage control cams 93,94 are arranged in holes 7 in the casing 76 of the control block 7. radially movable 3/2 direction control within 5. Completely moved 3 / Two-way control valves 73 and 74 control the piping pieces, piping rVA, piping V and piping ■ A is connected to the two-position selection cylinder 8 in the switching position of FIG. 1, or In the second switching position, the connection between the control block 7 and the two-position selection cylinder 8 is interrupted. The pipes IVA and VA between are drained. 3/2 direction system acting as a piston The piston chambers 71 and 72 of the control valves 73 and 74 are respectively connected to the other 372 direction control valve. (Piping ■ is connected to piston chamber 71 via piping VB. , the piping ■ is connected to the piston chamber 72 via the piping IVI3). plumbing hmu A shuttle valve 79 is also connected to the pipe VA, and its outlet is connected to the pipe VA as described above. Pressure medium is supplied to the piston device 21 via (FIG. 1).

The two-position switching cylinder 8 has a piston 81, two piston chambers 82, 83 and both It has a damping device 84 that acts in one end position and can be switched off via an adjusting lever 92. Move the changing shaft 9 in the direction of gears L, 3, 5, 7 or R12, 4, 6, 8, and adjust to neutral position.

The control block 7 operates in conjunction with the two-position switching cylinder 8 as follows.

Controls arranged in the circumferential direction on the transmission shaft 3 in the neutral position of the gear shift lever 2 By means of the cam 34 both 372 directional control valves 15, 16 are placed in the flow-through position. , pressure is applied to the pipe piece and the pipe V. Piston chamber 71 is filled via piping VB The piston chamber 72 is filled through the piping iB, and both pistons act as pistons. The other 3/2 directional control valve 73, 74 resists the pressure of the spring 77 (as shown). ) is moved to the first inner position. In that case contact bin 7 of both 372 directional control valves 8 is between the respective inner cams 93A, 94A and cams 93B, 94B. In a state of easy rocking of the contact pin 78 in relation to the switching axis 9, since it is unstable. Selectively both 372 directional control valves are switched to the through-flow position, thus disposing via the pipes IVA, VA and the piston chamber 82.83 of the piston 81 in the intermediate position The switching shaft 9 is also fixed in the illustrated neutral position via the adjusting lever 92.

When adjusting the shift lever 2 to the switching position 23 corresponding to the gears R12, 4, 6, and 8. In this case, the pipe V is discharged and connected to the pipe via the 3/2-way control valve 73 and the pipe piece IVA. Since the stone chamber 82 is filled, the piston 81 is moved to the rear end position on the right side. , in which case the switching shaft 9 is rotated clockwise via the adjusting lever 92. figure at the same time The switching rod attached to the switching passage, the switching oscillating link can be connected via the switching finger (not shown). The link and moving sleeve are synchronized and are loaded after the same constant rotation. Piss now The tongue 81 is in one end position. During this process, the contact pin 78 372 directional control valve 7 for discharging the piston chamber 71 despite running on top of 3B. 3 increases the second radially outer position, so in the 3/2 direction 1, the pin via the control valve 73 The pressure supply of the stone chamber 82 is guaranteed. Only after the implementation of the switchover (i.e. When the piston 81 reaches its end position), the 3/2 directional control valve is activated by the action of the cam 930. The piston chamber 82 is also discharged via. As a result, the ym becomes pressureless and the piston Since the shift device 21 frees the switching lever, this switching lever is at the end of the gear position. It can be adjusted to

The driver now operates the clutch again in a known manner, in which case the switching valve 41 shuts off the pressure medium supply. In the case of a transmission without a clutch pedal, pipe m and The clutch is engaged directly via the piping 80, and the switching valve 41 can be omitted. two A generally known hydraulic end position damping device 84 is arranged on the position switching cylinder. . This effect can be seen, for example, in the Herion Pocket Book published in 1969. -Taschenbuch) 1, pp. 44-49.

2 and 3 show, for example, a main transmission 51 with four gears, a group The gear transmission 5 having the transmission 52 and the pre-transmission 53 is shown in front. It is shown in the figure (FIG. 2) and the plan view (3). Adjust it (adjust) to the range of switching axis 9 A two-position switching cylinder 8 with a damping device 84 is arranged for rotation (with a lever 92). It is placed. A control block 7 is also introduced in the intermediate range next to the switching shaft 9, On the other hand, a three-position selection cylinder 6 is arranged in an extension of the switching shaft 9. group shifting The switching cylinders 55, 56 for the device 52 and the split transmission 53 are known. It is placed near the driven shaft 59 as shown in FIG. 57 is arranged.

FIG. 4 shows the control circuit for the transmission changeover device 1 with the transmission '@3, respectively. Indicates the position moved in the axial direction by half of the switching passage (-gear gear), and this position is shown for each forward gear. The positions of the transmitting shafts 3 correspond to each other. The piston device 170 has three pistons. having a ton 171.172.173 and a piston chamber 174.175.176; The switching path position of the transmitting shaft 3 is obtained via the driving pin 178 and the ratchet groove 132. (See Figures 8 and 9). In the piston chamber, Switching valves 18A, 18B, and 180 are attached to supply or discharge pressure medium there. It is. 4 is a pressure medium source, and the switching valve is, for example, an electronic circuit device depending on the rotation speed. 19. The return of the pistons 171, 172, and 173 is done by the transmission case. This is done via a return spring 177 supported by the thing 17. Fixed to piston 173 A spring 35 is also arranged between the fixed driving pin 178 and the transmitting shaft 3.

From the table in Figure 5, it can be seen that The operating status of the switching valves 18A, 18B, and Igc can be known at each time.

6, 7 and 8 show possible structural embodiments of the gearshift device l. are doing. The gear shift lever 2 is centered around the transmission shaft 3 and moves to the gear shift positions 22, 23 and 23. and end position 25, 26, whereby the transmitting shaft 6 is in the illustrated neutral position. (See Figure 6). The yellow selection for the switching path is a spherical guide. The spherical guide 28 rotates around the center point of the gear shift lever. -2, and cooperates with the guide of the casing 17 of the transmission changeover device 1. Shift lever When actuating bar 2 into the selected position of the switching path at right angles to the direction of travel (this is The transmission shaft 3 is a knuckle joint (fork pin). 133, fork 29, and hinge pin 29A). the As is known in the case of H-type or Ha-type switching diagrams, each switching passage is This corresponds to the reversal of the selection position 330 of the switching path of the speed lever 2, in which case this well-known Unlike switching, each switching passage corresponds to one gear (see Figure 4). .

For example, the gear shift lever 2 has 11 gears, which has changed from a driving method aimed at output to one aimed at economy. A switching lever 27 for switching the transmission to the driving mode is also arranged. In this case, for example, a series group (split group) is connected via the switching cylinder 56. It is connected.

The transmitter shaft 3 has a push switch 134 that cannot rotate relative to it and half of the switching passage (- (see Figure 8), in which case the central position is Adjustment is made without any load via spring 131. The bush 134 has a ratchet groove 1. 32 is also arranged, and the ratchet groove 132 is firmly connected to the piston 173. Entraining pin 178 is engaged. This ratchet groove 132 is connected to the gear position in each case. changes from the neutral position to gears 1, 3.5, etc. only under the action of a switching force. It can be adjusted to any of the switching positions R, 2, 4, etc., and the spring 134 can be adjusted in the selected direction. It is possible to change the gears adjacent to each other in the state where the return spring 177 is defeated. It is configured so that it can be switched to another gear in the defeated state.

The pusher 134 firmly contacts the end stopper 135 on the sending shaft 3, and the piston 1 71.172.173 may also be used as piston chamber 174, 175.17617 depending on the circumstances. ) Due to the connection via the entraining pin 178, the movement of the sending shaft 3 in this direction with respect to filling is Therefore, reverse switching beyond one gear stage is not possible.

Stroke 179mm, 179B, 17 in piston 171.172.173 9 (3 is limited via a stopper 180 during the pressure medium supply and the maximum stroke so that the stroke is 4 times the minimum stroke and the average stroke is 2 times the minimum stroke. It is determined (in binary coded decimal system).

As is well known, the switching passage in the HE type switching shaper 90 (see Fig. 9) has a limit. force ~ restraint pressure adjustment force (Federal Republic of Germany Utility Model No. 7892241, No. 3 (see figure) is not directly attached, so the driver must check the position, and the ratchet groove 132 also moves in the axial direction in the switching diagram. It changes as if The ratchet groove is bent in the range of the neutral position and has two That is, one half of the passage 132A covers, for example, the gear position 3 from the neutral position. The other passage half 132B corresponds to the switching passage half 132B from the neutral position to the gear position 4. However, only half of the switching passage is shifted, thereby shifting gear position 4 and It is located between the gear position 2 and the gear position 2. Both passage halves 1 of the ratchet groove 132 32A and 1.32B also come with restraint force and return force 191 and 192. For example, in order to insert it into gear 3 at the position of the ratchet groove 132 shown in the figure. There is no need to apply a selective or axial force.

As is generally known, simply shift the gear shift lever 2 from the neutral position to the switching position 22.2. 3 and after achieving synchronization to the end position 25.26, for example, the limit Switching and synchronizing forces are provided to overcome force 400. But for example this lachi When attempting to shift gear 4 or gear 2 at the jet groove 132 position , the first limiting force 310 acting in both directions must also be overcome by selective forces. So In the case of , the ratchet groove 132 is displaced by half the path in both switching positions, which This is made possible by the spring 131 between the bushing 134 and the transmitting shaft 3 (the eighth (see figure). Another limit force of 320 was appropriate at intentional and acceptable high switching. If the selection force is overcome, the return spring 177 is overloaded at high switching. Since the ratchet groove 132 is compressed at the same time, reverse switching from the position of the ratchet groove 132 is prevented. On the other hand, in the direction of reverse switching, the movement of the pukuyu groove 134 and the transmitting shaft 3 is also restrained by the stone device. The axial displacement of the ratchet groove 132 is determined by the electronic rotation. Switching valves 18A to 18 receive switching commands from the road device 19 depending on the rotation speed, for example. 0 compresses the piston chambers 174 to 176 in accordance with the table of FIG. This is done by supplying the medium.

When the driver is recommended to shift gear 3 at the position shown in Figure 9, In this case, the driver must find the minimum switching resistance in that direction (driving or reversing). There is no need to recognize this gear 3, as it must just sense its presence. stomach. Under normal conditions, the driver selects two of the eight gears instead of one. Choose. Furthermore, as already mentioned, a large force is applied to the two gears 2.4 that are adjacent to each other. You can give and choose. The driver uses the switching lever 27 to change the The split group of the gearbox can be switched auxiliary to achieve economical operation mode and output. You can choose between directed driving modes. As can be seen from the simple diagram in Figure 10. In addition, in the output-oriented mode of operation SL, there is a switch to the economical mode of operation 86. The turning point is displaced in the direction of high speed rotation〇 international search report Continuation of page 1 @Inventor: Beaver, Gerolt Federal Republic of Germany Day-7993 Langenalgen, Muehlengeno 1ten 7

Claims (1)

[Claims] 1. The gear shift lever moves according to the HH type switching diagram, and the gear shift lever moves within the driver's range. It is placed in the speed change device, and the transmission shaft selects the switching path in the speed change device. a shifter located in the transmission, which is moved to and rotated to change gears. The selection cylinder for road switching and the switching cylinder for gear switching. controlled via a valve that directs the pressure medium from the pressure medium source, in which case the switching device ratchet and feel to prevent gear changes if gear is still engaged. It has a device that displays the busy position so that the shift lever can indicate the shifting position that the transmission is in. Gear transmissions in which the driver is informed via In dynamic shifting devices, the selection and switching movements are arranged in the gear shifting device (1). a set of two each cooperating with the control cams (32, 33) on the transmitting shaft (3). Three position selection via 372 directional control valves (11, 12 and 15, 16) respectively is transmitted to the cylinder (6) and the two-position switching cylinder (8), in which case the 3/2-way Directional control valves (11, 12 to 15, 16) are respectively used for switching the switching passages. arranged next to each other axially and circumferentially for gear shifting; 72 directional control valve (11, 12) and 3-position selection cylinder (6) In cooperation with the switching shaft (9), the supply pipes (■, ■) between the The valve (91) is located in both supply pipes (■, ■A and and V, 'JA), it is formed movably as a piston and is worked each time in the circumferential direction. 3/2 directional control valve cooperating with control cams (93, 94) on the switching shaft (9) for use (73, 74) are fixed even when the two-position switching cylinder (8) is in the neutral position. A pressure medium operated switching device characterized in that it is arranged as follows. 2. 3/2 direction control formed to be movable as a piston in cooperation with the switching shaft (9) valves (73, 74) are each axially movably disposed within the bore (75); Each is compressed radially outward by a compression spring (77), and the other 372 direction The pressure medium passing through the control valve causes the control cam (93, 94) Pressure medium according to claim 1, characterized in that the pressure medium is moved towards Actuated switching device. 3. The control cap attached to the 3/2 direction control valve (73, 74) on the switching shaft (9) The systems (93, 94) are formed in multiple stages (93A-0, 94A-C), and the neutral position (N ), the radially inner side (93A, 94A) of the control cam (93, 94) and the radially Mukai-middle (93B. 94B), both contact elements (78) are supported in contact with the transition ramp. A pressure medium operated switching device according to claim 2, characterized in that: 4. Between both supply pipes (~, ■ and V%VA) to the two-position switching cylinder (8) A shuttle valve (79) is disposed at the the piston device (21) arranged on the bar (2); ) until the shift in the transmission is completed, move the shift lever (2) to the shifting position. The pressure medium according to claim 3, wherein the pressure medium is constrained to #(22, 23). Body operated switching device. 5. 3/2 direction control valves (15 , 16) enters the flow-through position only when the gear shift lever (2) is in the neutral position fit (N). at each switching position (22, 23) and end position (25, 26). Only the 3/2 directional control valves (15, 16) are characterized in that they quickly cut off the pressure medium. A pressure medium operated switching device according to claim 4. 5. Switching passage based on HH type switching diagram (R11/2.3/4.5/6.7/8) Despite the adjustment of the transmission shaft (3) to (9) is a three-position selection cylinder (6) that allows three switching connections of the main transmission (51). path, in which case both pins are moved to select the intermediate switching path (1/2). Claim 1, characterized in that a pressure medium is supplied to the stone chambers (61, 62). Pressure medium operated switching device according to item 1. 7. The three-position selection cylinder (6) is connected to the casing (63) and the piston with a three-part structure The inner piston (64) is the switching shaft. (9), having an axially intermediate large diameter collar (640); This collar (640) is arranged so that it can move axially over the inner piston (64) Two piston bushes (65L). 65R) to one direction of movement, and the piston bush (651, 65R) ) by a stopper ring (66) fixed to the casing in the same direction. further movement is prevented, and the switch is placed in an intermediate position (e.g. 1/2 of the central switching passage). The roller (640) and the stopper (66) are aligned in the axial direction and the casing is The bordering end surface side and both end surfaces of the inner piston (64) are respectively connected to the switching shaft (9). of the claim characterized in that they have the same spacing corresponding to the switching passage spacing in Pressure medium operated switching device according to scope 6. 8. Line up the transmission shaft (3) in the axial direction and connect the group via the adjustment cylinder (55). Two 372 directional control valves (13, 14) for switching the loop transmission (52) ) is also arranged. switching device. 9. A switching lever (27) for the GV-switching valve is arranged on the gear shift lever (2). , the switching lever (27) is connected to the split transmission (5) via the adjustment cylinder (56). 3). conversion device. 1 (L pressure medium source (4) and switching valves (11 to 16) in the speed change switching device (1) When manually actuating the clutch during the flow through only when the clutch is disengaged Claim 1, characterized in that a 3/2 directional control valve (41) is also arranged. Pressure medium operated switching device according to item 9. 11. Operate the switching clutch between the shuttle valve (79) and the piston device (21). Claims characterized in that the piping (80) to the control valve to be operated is also connected. Pressure medium operated switching device according to clause 4. 12. A piston device (170, Fig. 4) is also arranged in the speed change device (1), and this The piston device (170) is connected to at least one of the various gears or switching passages of the motor vehicle. Corresponding to a spring restraint device in a selected direction in relation to one operating parameter, the operating The hand is informed of a good gear or a good switching path to change to each time. The pressure medium according to any one of claims 1 to 11, characterized in that: Actuated switching device.