FR3061253A1 - AUTOMATIC TRANSMISSION - Google Patents

Abstract

The invention provides an automatic transmission (1) for stable and firm attachment of a gearshift unit to a transmission housing assembly already available without major modification of the existing structure for improved productivity. The automatic transmission (1) comprises a transmission housing (4) formed with a plurality of threaded holes (4a-4e). A base plate (35) of a gearshift unit (30) has bosses (35F-351) formed with a bolt hole. A change case (5) having bosses (5A-5E) formed with a bolt hole is firmly attached to the transmission case by attaching the bosses (5A-5E) to the threaded holes (4a-4e) with bolts (19A). at 19E). The base plate is firmly fixed only to the change case by attaching the bosses (35F to 351) to the bosses (5F to 5I).

Description

Holder (s):

SUZUKI MOTOR CORPORATION.

O Extension request (s):

® Agent (s): CABINET PLASSERAUD.

FR 3 061 253 - A1 ® AUTOMATIC TRANSMISSION.

@) The invention provides an automatic transmission (1) allowing a stable and firm attachment of a gear change unit to an already available transmission housing assembly without major modification of the existing structure for improved productivity.

The automatic transmission (1) comprises a transmission casing (4) formed with a plurality of threaded holes (4a to 4e). A base plate (35) of a speed change unit (30) has bosses (35F to 351) formed with a bolt hole. A change housing (5) having bosses (5A to 5E) formed with a bolt hole is securely attached to the transmission case by attaching bosses (5A to 5E) to threaded holes (4a to 4e) with bolts (19A to 19E). The base plate is fixed firmly only to the change housing by attaching the bosses (35F to 351) to the bosses (5F to 5I).

Γ “”

BEFORE

AUTOMATIC TRANSMISSION

The present invention relates to an automatic transmission for a vehicle.

Automatic manual transmissions (TMA) are known and used as automatic transmission for an automobile. An automated manual transmission is a transmission that is mechanically similar to a shift change transmission, except that a computer performs the gear change and clutch work via actuators.

Document JP 2016-38 069A (designated by patent literature 1 below) discloses an automated manual transmission in which a gear change unit is fixed to an upper surface of a transmission housing. The shifting unit automatically operates a shift and selection shaft for shifting.

The speed change unit includes a selection actuator for axially moving the change and selection shaft; a change actuator for angularly moving the change and selection shaft; a hydraulic pump for supplying hydraulic fluid to the selection and change actuators; and a hydraulic pressure device including a motor and an accumulator.

The shifting unit further includes a base plate on which the selector and shift actuators and the hydraulic pressure are integrated. This base plate is securely attached to various points on a transmission case by a plurality of mechanical fasteners such as bolts.

Patent literature 1: JP 2016-38 069A.

Known automated manual transmission may require major modification or redesign of a transmission case to ensure stable and firm attachment of the shifting unit to the transmission because of the number of points to which the base plate is attached to the transmission case inevitably increases to strengthen the connection between the gear change unit and the transmission case.

The present disclosure is based on the object of allowing a stable and firm attachment of a gear change unit to a transmission housing assembly which is already available without any major modification to the existing structure of the transmission housing assembly. transmission for improved productivity of automatic transmissions. An automatic transmission is proposed which allows a stable and firm attachment of a gear change unit to a transmission housing assembly which is already available without any major modification made to the existing structure of the transmission housing assembly for productivity. improved.

According to one embodiment, an automatic transmission is proposed including: a transmission casing; a change housing supporting a change and selection shaft; and a shift unit configured to automatically operate the shift and selection shaft for shifting. The gear change unit including an actuator for the shift and selection shaft, a drive device for the actuator, and a base plate, held fixed relative to the transmission case, configured to couple the device actuator drive. The transmission case includes a group of a plurality of first female components of mechanical fasteners. The base plate includes a group of a plurality of second male components of mechanical fasteners. The change housing includes a group of a plurality of first male mechanical fastener components which are used in conjunction with the group of the plurality of first female mechanical fastener components to attach the change housing to the transmission housing. Additionally, the change housing includes a group of a plurality of second female mechanical fastener components which are used in conjunction with the group of the plurality of second male mechanical fastener components to attach the base plate to the change housing . At least some of the plurality of second female components of mechanical fasteners are disengaged from the transmission case.

The embodiment has accomplished the object of allowing a stable and firm attachment of a shifting unit to a transmission housing assembly which is already available without any major modification to the existing structure of the transmission housing. transmission for improved productivity of automatic transmissions.

According to the present invention, the automatic transmission has the following characteristics, taken alone or in combination:

- the entire plurality of second female components of mechanical fasteners is disengaged from the transmission housing;

- only the change housing is formed with the entire plurality of second female components of mechanical fasteners;

- The change housing includes an annular articulation portion at the level of which the change housing comes into contact with the transmission housing and at least one extension zone portion which extends the articulation portion;

- at least one of the plurality of second female components of mechanical fasteners of the group is in the extension zone portion;

- each of the plurality of second male components of mechanical fasteners of the group includes a mechanical fastener and a through hole through which the mechanical fastener passes;

- each of the plurality of second female components of mechanical fasteners of the group includes a fastening hole engaged on the mechanical fastener;

- the drive device includes a reservoir tank which retains the hydraulic fluid, a supply of hydraulic fluid which supplies the hydraulic fluid from the reservoir tank to Γ actuator;

- the tank contains a concave element which receives the mechanical fastener.

Figure 1 is a perspective view of an automatic transmission according to one embodiment.

Figure 2 is a top plan view of the automatic transmission.

Figure 3 is a side elevation of the automatic transmission.

Figure 4 is the side elevation of the automatic transmission with the transmission housing removed, illustrating its internal structure.

Figure 5 is a top plan view, similar to Figure 2, of the automatic transmission, illustrating the automatic transmission with a shift unit and a shift housing removed.

Figure 6 is a front elevation of the change housing which supports a change and selection shaft.

Figure 7 is a perspective view of a base plate of the automatic transmission.

Figure 8 is a block diagram which illustrates the configuration of a hydraulic pressure generating device and a speed change actuator, and also the direction of flow of the hydraulic fluid.

Figure 9 is a top plan view of the shift housing that supports the shift and selection shaft.

Figure 10 is a bottom plan view of the shift housing that supports the shift and selection shaft.

FIG. 11 is an exploded view of the automatic transmission seen from the same side as the side elevation of FIG. 3, illustrating the relationship of a transmission casing assembly, of the shift casing which supports the shift shaft and and a gear change unit.

Figure 12 is an exploded view of the automatic transmission viewed from above in the same manner as in the top plan view of Figure 2, illustrating the relationship of the transmission housing assembly and a base plate.

An automatic transmission according to one embodiment includes: a transmission housing; a change housing supporting a change and selection shaft; and a shift unit configured to automatically operate the shift and selection shaft for shifting. The shifting unit includes an actuator for the shift and selection shaft, a drive device for the actuator, and a base plate, held fixed relative to the transmission case, configured to couple the device actuator drive. The transmission case includes a group of a plurality of first female components of mechanical fasteners. The base plate includes a group of a plurality of second male components of mechanical fasteners. The change housing includes a group of a plurality of first male mechanical fastener components which are used in conjunction with the group of the plurality of first female mechanical fastener components to attach the change housing to the transmission housing. Additionally, the change housing includes a group of a plurality of second female mechanical fastener components which are used in conjunction with the group of the plurality of second male mechanical fastener components to attach the base plate to the change housing . At least some of the plurality of second female components of mechanical fasteners being disengaged from the transmission case.

The embodiment has accomplished the object of allowing a stable and firm attachment of a shifting unit to a transmission housing assembly which is already available without any major modification to the existing structure of the transmission housing. transmission for improved productivity of automatic transmissions.

Referring to the accompanying drawings, the embodiment is described in detail. Throughout Figures 1 to 7 and 9 to 12, the designations "upper", "front" and "left", relative to an occupant in the driver's seat of an automobile in which the automatic transmission according to the embodiment is installed laterally at the front, are used to show the projection of each of the views.

Referring now to Figures 1 to 3, the reference numeral 1 generally designates the automatic transmission, which is often called an automatic manual transmission (TMA), according to the embodiment. The automatic transmission 1 is mounted on a vehicle in the form of an automobile, not shown, within an engine compartment. As best seen in Figures 1 and 2, the automatic transmission 1 includes a transmission housing assembly 2. The transmission housing assembly 2 includes a clutch housing 3 and a transmission housing 4 which is attached to the housing clutch 3.

As indicated by a dotted line in Figure 2, a starting clutch 51 is located inside the clutch housing 3. Referring to Figure 4, an input shaft 6, a first intermediate shaft 7, a second intermediate shaft 8, and a differential 9 are located inside the transmission casing 4. The input shaft 6, the first intermediate shaft 7 and the second intermediate shaft 8 are installed so that their axes become parallel.

As best seen in Figure 1, an end portion of the input shaft 6 protrudes from the transmission housing 4 in the clutch housing 3 to receive the power transmission from a combustion engine internal 50 (see FIG. 2) via the clutch 51. Input gears 6A capable of being moved are mounted on the input shaft 6. The input gears 6A, which correspond in number to the number of gears front and rear, are separated in an axial direction from the input shaft 6.

First intermediate gears 7A capable of being moved are mounted on the first intermediate shaft 7, and second intermediate gears 8A capable of being moved are mounted on the second intermediate shaft 8. Each of the first and second intermediate gears 7A and 8A meshes with the input pinion coupling pinion 6A.

The dashed line in FIG. 3 indicates a final drive pinion 7B mounted on the first intermediate shaft 7 and another final pinion 8B mounted on the second intermediate shaft 8. The final drive pinions 7B and 8B mesh with a final driven pinion 9A of differential 9.

The differential 9 includes the final driven pinion 9A, a differential casing 9B on which the final driven pinion 9A is mounted, and differential pinions, not shown, within the differential casing 9B.

Referring to Figure 5, the upper wall of the transmission housing 4 is formed with an opening 4A. A change and selection shaft 10 is located in the transmission casing 4 through the opening 4A. The change and selection tree 10 has a vertical axis orthogonal to the axis of the input shaft 6. Referring to FIG. 6, the change and selection tree 10 extends from the inside the transmission case 4 towards the outside of the transmission case 4.

A change housing 5 is firmly attached to the upper wall of the transmission housing 4. The change housing 5 supports the change and selection shaft 10 so that the change and selection shaft 10 can move axially along from the vertical axis and rotate around the vertical axis.

On the upper wall, the transmission casing 4 is formed with an annular articulation portion 4B (see FIG. 5). On the underside, the change housing is formed with the coupling ring portion 5J (see Figure 10). The annular joint portion 5J makes contact with the annular joint portion 4B. The joint portion 5J which is configured to be vertically thickened according to the embodiment constitutes a joint portion as claimed.

Referring to FIG. 4, the first intermediate shaft 7, the second intermediate shaft 8, and the final driven pinion A are on one side of a hypothetical vertical, with respect to the vehicle, plane in which the axis of the input shaft 6 extends, and the change and selection shaft 10 is on the opposite side of the vertical plane.

Referring now to Figure 11 with continuous reference to Figure 4, the change and selection shaft 10 has two internal levers 10A and 10B, one being axially distant from the other. As best seen in Figure 4, the internal lever 10A can engage one selected from the two change pieces 12A and 12B, and the internal lever 10B can engage one selected from two change pieces 12C and 12D.

Change pieces 12A, 12B, 12C and 12D are coupled to change shafts 13A, 13B, 13C and 13D, respectively. The change shafts 13A, 13B, 13C and 13D are mounted on the transmission casing 4 so that the shafts 13A to 13D can move axially in a relationship parallel to the axis of the input shaft 6.

Change forks 14A, 14B, 14C and 14D are securely attached to the change shafts 13A, 13B, 13C and 13D, respectively. The change forks 14A, 14B, 14C and 14D are coupled to their respective claw clutches, not shown. The two claw clutches, to which the change forks 14A and 14B are coupled, are mounted on the first intermediate shaft 7 so that these claw clutches can change in an axial direction and the opposite axial direction along the axis of the first intermediate shaft 7. The two other claw clutches, to which the change forks 14C and 14D are coupled, are mounted on the second intermediate shaft 8 so that these claw clutches can change in an axial direction and the axial direction opposite along the axis of the second intermediate shaft 8.

In the present implementation, the change and selection shaft 10 moves (or moves vertically) in an axial direction and the opposite axial direction along its axis to perform a selection operation, and it rotates around the axis at the selected position to perform a change operation.

In detail, after the change and selection shaft 10 has moved along its axis towards a selected position at which the internal lever 10A comes to engage one of the change pieces 12A and 12B or that the lever internal 10B engages one of the change pieces 12C and 12D, the change and selection shaft 10 rotates around its axis to cause one of the change shafts 13A, 13B, 13C and 13D to move axially in a relation parallel to the axis of the input shaft 6.

In response to the axial movement of the shift shaft 13A or 13B or 13C or 13D, the shift fork 14A or 14B or 14C or 14D which is firmly attached to the shift shaft 13A or 13B or 13C or 13D moves its clutch with claws in an axial direction or the opposite axial direction along the axis of the corresponding shaft among the first intermediate shaft 7 and the second intermediate shaft 8 for coupling the pinion engaged between the first intermediate pinions 7A and the second intermediate pinions 8A to the corresponding intermediate shaft 7 or 8.

This makes the gear by the intermediate pinion 7A or 8A coupled to the corresponding intermediate shaft 7 or 8 and the coupling pinion of the input pinions 6A active to establish a pinion or a speed.

With the gear 6A / 7A (or 7B) engaged by the coupling of the intermediate pinion 7A or 7B to the intermediate shaft 7 or 8, with the starting clutch 51 engaged, the power of the internal combustion engine 50 is transmitted from the input shaft 4 to the first intermediate shaft 7 or to the second intermediate shaft 8 via the engaged pair of pinions capable of being moved 6A / 7A (or 7B).

With, now, the power transmitted from the first intermediate shaft 7 or the second intermediate shaft 8 to the final driven pinion 9A via the associated pinion among the final drive pinion 7B and 8B, the differential pinions inside the differential casing 9B transmit power to the left and right drive wheels, not shown, via the left drive axles, not shown, while controlling the difference in rotation between the left and right wheels. The left and right drive wheels have the ability to rotate at different speeds.

Furthermore, the internal combustion engine 50 (see Figure 2) includes a crankshaft (not shown) and a flywheel (not shown) firmly attached to the crankshaft. The clutch 51 includes a friction plate (not shown) attached to the input shaft 6.

In the default state in which the clutch 51 is engaged, so that the friction plate is left in contact with the flywheel, power is transmitted from the crankshaft to the input shaft 6. With the clutch 51 disengaged to separate the friction plate from the flywheel, the power transmission from the crankshaft to the input shaft 6 is interrupted.

Referring to Figure 1, a declutching element 20 is located inside the clutch housing 3. The declutching element 20 includes a declutching stop 21 and a declutching cylinder 22. The declutching stop 21 and the declutching cylinder 22 are mounted on the input shaft 6.

The hydraulic fluid is supplied to the declutching cylinder 22 via a hydraulic pressure line 23. The declutching stop 21 is operational on the hydraulic pressure supplied to the declutching cylinder 22 and operates to drive the friction plate of the clutch 51 in contact with the flywheel and separate the flywheel. This allows the power transmission from the internal combustion engine 50 to the input shaft 6 or to interrupt the power transmission.

A hydraulic pressure generation device 32, a speed change actuator 33 and a control unit 34 are located at the top of the transmission case assembly 2 on the outside of the transmission case assembly 2. The generation of hydraulic pressure 32, the speed change actuator 33 and the control unit 34 are fixed to a base plate 35 which is fixed to the change housing 5.

The hydraulic pressure generation device 32 includes a reservoir tank 36, a motor 37, a hydraulic fluid pump 38 and an accumulator 39. The reservoir tank 36 stores the hydraulic fluid. The hydraulic fluid pump 38, when supplied by the motor 37, supplies the hydraulic fluid stored in the reservoir tank 36 to the accumulator via a hydraulic fluid passage, not illustrated, with which the base plate is formed 35.

The accumulator 39 accumulates the pressure of the hydraulic fluid and supplies the high hydraulic pressure to the speed change actuator 33 via a passage of hydraulic fluid, not illustrated, with which the base plate 35 is formed.

Referring to Figure 7, the base plate 35 is of planar shape resting in a horizontal plane, relative to the vehicle. The base plate 35 includes an accumulator post 35A, to which the accumulator 39 is fixed, and an engine post 35B, to which the motor 37 is fixed. The base plate 35 is formed with communication holes 35C. The communication holes 35C constitute hydraulic fluid passages through which the reservoir tank 36 and the hydraulic fluid pump 38 communicate with each other.

The base plate 35 has a shift actuator post 35E, to which the shift actuator 33 is attached. The shift actuator post 35E is formed with an opening 35e. The change and selection shaft 10 passes through the opening 35e so that the upper part of the change and selection shaft 10 projects from the opening 35e upwards from the upper surface of the plate. base 35.

Referring to FIG. 6, an external lever 16 is fixed at the top of the change and selection shaft 10 and a helical spring 17 is mounted on the upper part of the change and selection shaft 10. The spring helical 17 biases the change and selection shaft 10 upwards in the axial direction of the change and selection shaft 10.

Referring to Figure 8, the gear change actuator 33 includes a clutch operating solenoid 40, a selection operating solenoid 41, a shift operating solenoid 42, a selection actuator 43 and an actuator shift 44. The speed change actuator 33 of the present embodiment constitutes an actuator as claimed.

Returning to Figure 7, the base plate 35 is formed with a supply of hydraulic fluid 35D. One end of the hydraulic pressure line 23 is fixed to the supply of hydraulic fluid 35D. The hydraulic fluid supply 35D is formed with a hydraulic fluid passage 35d. The hydraulic fluid passage 35d communicates with the accumulator 39 via a hydraulic fluid passage, not illustrated, with which the base plate 35 is formed. This configuration makes it possible to supply the high hydraulic pressure from the accumulator 39 to the clutch cylinder. 22 via the hydraulic fluid passage 35d of the hydraulic fluid supply 35D and the hydraulic pressure line 23.

The clutch operating solenoid 40 provides the high hydraulic pressure which is generated by the accumulator 39 from the passage of hydraulic fluid 35d from the hydraulic fluid supply 35D to the clutch cylinder 22 via the hydraulic pressure line 23 to operate the clutch 51.

The selection operating solenoid 41 adjusts the high hydraulic pressure which is generated by the accumulator 39 to supply the adjusted pressure to the selection actuator 43. The change operating solenoid 42 adjusts the high hydraulic pressure which is generated by the accumulator 39 for supplying the adjusted pressure to the change actuator 44.

The selection actuator 43 presses the change and selection shaft 10 against the stress of the helical spring 17 in response to the hydraulic pressure supplied by the selection operating solenoid 41 to linearly operate the change and selection shaft 10 in a selection direction along its axis. Immediately after it is released from the pressing force, the change and selection shaft 10 is pushed by the coil spring 17 to move in the opposite selection direction along its axis.

As described, the selection actuator 43 and the helical spring 17 cooperate with each other to move the change and selection shaft 10 in a selection direction or the opposite selection direction. The helical spring 17 biases the change and selection shaft 10 upwards so that the change and selection shaft 10 moves upwards to a predetermined maximum protruding position.

In the present implementation, with the change and selection shaft 10 in the aforementioned predetermined maximum protruding position, the automatic transmission 1 remains in neutral position, without being limited thereto. The axial displacement of the change and selection shaft 10 downwards against the helical spring 17 allows the change and selection shaft 10 to adopt a position selected from among the other predetermined speed selection positions.

With the shift and selection shaft 10 in the selected gear selection position, the shift actuator 44 presses the shift lever of the shift and selection shaft 10 in response to the hydraulic pressure supplied by the solenoid change operation 42 for angularly operating the change and selection shaft 10 about its axis in a change direction or the opposite change direction.

Referring now to Figures 1 to 4, the control unit 34 consists of a computer unit which includes, but is not limited to, a central processing unit (CPU), a read only memory (ROM), and a random access memory (RAM). The control unit 34 determines an appropriate change point in response to a range position input from a transmission range sensor, not illustrated, which detects a range selected by a transmission range selector, not illustrated, a vehicle speed input from a vehicle speed sensor, not shown, and an accelerator pedal position input from a accelerator pedal position sensor, not shown.

When determining the change point, the control unit 34 causes the clutch operating solenoid 40 to operate to supply the clutch cylinder 22 with hydraulic pressure. The hydraulic pressure supply to the declutching cylinder 22 causes the declutching stop 21 to separate the friction plate of the clutch 51 from the flywheel, interrupting the transmission of power from the crankshaft to the input shaft 6.

A discharge of hydraulic fluid from the declutching cylinder 22 after cessation of the supply of the declutching cylinder 22 with hydraulic pressure causes the declutching stopper 21 to bring the friction plate of the clutch 51 into contact with the flywheel, resuming the power transmission from crankshaft to input shaft 6.

The control unit 34 controls the selection operation solenoid 41 and the change operation solenoid 42 during disengaging of the clutch 51 so that the selection operation solenoid 41 and the change operation solenoid 42 supply the selection actuator 43 and the change actuator 44, respectively, to operate the change and selection shaft 10 in the axial direction along its axis and in the change direction around its axis to change gear.

Referring to Figure 1, a clutch stroke sensor 24 is mounted on the input shaft 6. The clutch stroke sensor 24 is connected to the control unit 34 via a wiring line 24a . The clutch stroke sensor 24 detects the cylinder position adopted by the clutch cylinder 22 and provides a cylinder position input to the control unit 34. The control unit 34 determines the status of the clutch 51, for example a slip of the clutch 51, in response to the cylinder position input coming from the clutch stroke sensor 24.

In the present implementation, the hydraulic pressure generation device 32 which includes the tank 36, the engine 37, the hydraulic fluid pump 38 and the accumulator 39 constitutes a drive device as claimed. In addition, the motor 37, the hydraulic fluid pump 38 and the accumulator 39 constitute a supply of hydraulic fluid as claimed.

A clutch operating device 31, the hydraulic pressure generating device 32, the gear change actuator 33, the control unit 34 and the base plate 35 constitute the gear change unit as claimed .

Returning to Figure 6, the change housing 5 has a guide plate 18. The guide plate 18 is formed with guide grooves 18A arranged and shaped to provide a change grid in which the change and selection shaft 10 moves to change the automatic transmission 1. The tip of a guide pin 10C of the change and selection shaft 10 is inserted into the guide grooves 18A.

During a selection of one of the pinions with the change and selection shaft 10, the guide pin 10C enters the corresponding groove of the guide grooves 18A deeply until it comes into contact with the bottom of the groove -guide 18A. The guide pin 10C and the guide grooves 18A restrict movement of the change and selection shaft 10 within a predetermined range and prevent the change and selection shaft 10 from wobbling.

Referring to Figure 5, the hinge portion 4B of the transmission case 4 includes or is formed with a group of a plurality of (five in the illustrated embodiment) first female components of mechanical fasteners in the form , but not limited to, five threaded holes 4a, 4b, 4c, 4d and 4th. The threaded holes 4a, 4b, 4c, 4d and 4e are distributed along a circumferential direction of the articulation portion 4B. The articulation portion 4B comprises or is formed with two pin holes 4j and 4k. Each of the pin holes 4j and 4k is dimensioned to receive a positioning pin, not shown. In the present implementation, the two pin holes 4j and 4k are formed at positions suitable for alignment with the coupling pin holes 5j and 5k (see Figures 9 and 10) during positioning of the change housing 5 with respect to the transmission housing 4.

Referring to Figures 9 and 10, a change portion 5J of the change case 5 includes or is formed with a group of a plurality of first male components of mechanical fasteners in the form, without limitation, of five bosses 5A, 5B, 5C, 5D and 5E. The bosses 5A, 5B, 5C, 5D and 5E have bolt holes 5a, 5b, 5c, 5d and 5e, respectively.

As best seen in Figure 10, the bolt holes 5a, 5b, 5c, 5d and 5e are distributed along a circumferential direction of the hinge portion 5J. The articulation portion 5J comprises or is formed with two pin holes 5j and 5k, each dimensioned to receive a positioning pin, not shown. In the present implementation, the two pin holes 4j and 4k are formed at positions suitable for alignment with the coupling pin holes 4j and 4k (see Figure 5) during positioning of the change housing 5 by relative to the transmission housing 4.

Positioning of the change housing 5 relative to the transmission housing 4 begins with the insertion of a positioning pin into the pin holes 5j and 4j which are aligned and the insertion of another positioning pin in the holes 5k and 4k pin which are aligned. With the positioning pin in the pin holes 5j and 4j and the positioning pin in the pin holes 5k and 4k, the bolt holes 5a, 5b, 5c, 5d and 5e are held in an alignment relationship with the threaded coupling holes 4a, 4b, 4c, 4d and 4e, respectively.

Referring also to Figure 12 with continued reference to Figures 5, 9 and 10, with the bolt holes 5a, 5b, 5c, 5d and 5e held in alignment with the threaded coupling holes 4a, 4b, 4c, 4d and 4th, first male components of mechanical fasteners in the form of five bolts 19A, 19B, 19C, 19D and 19E are inserted into the respective bolt holes 5a, 5b, 5c, 5d and 5e and threaded into the threaded holes 4a , 4b, 4c, 4d and 4e respectively to attach the change housing 5 to the transmission housing 4.

Referring next to FIG. 7, the base plate 35 comprises or is formed with a group of a plurality of second male components of mechanical fasteners in the form, without limitation, of four bosses 35F, 35G, 35H and 351. The bosses 35F, 35G, 35H and 351 have bolt holes 35f, 35g, 35h and 35i, respectively.

Referring again to Figures 9 and 10, the change housing 5 includes or is formed with portions of extension zone 5S and 5T. By virtue of extending the articulation portion 5J towards the outside, the extension zone portions 5S and 5T are disengaged or separated from the transmission casing 4. In other words, the extension zone portions 5S and 5T are fixed to the different part of the transmission casing 4, so that each of the extension zone portions 5S and 5T and of the transmission casing 4 are separate parts. The expression “the extension zone portions 5S and 5T extend the articulation portion 5J towards the end” is used here to indicate that the extension zone portions 5S and 5T are located on the opposite side of the portion d hinge 5J towards the side of the hinge portion 5J on which the change and selection shaft 10 is located.

As best seen in Figure 9, the change housing 5 comprises or is formed with a group of a plurality of second female components of mechanical fasteners in the form of four bosses 5F, 5G, 5H and 51. The bosses 5F, 5G, 5H and 51 have threaded holes 5f, 5g, 5h and 5i, respectively. In detail, the extension zone portions 5S and 5T comprise or are formed with the three bosses 5F, 5G and 5H, so that these bosses 5F, 5G and 5H are located on the opposite side of the joint portion 5J towards the side of the articulation portion 5J on which the change and selection shaft 10 is located. This can be confirmed from FIG. 10 on which the threaded hole 5f is in the extension zone portion 5T and the 5g and 5h threaded holes are in the 5S extension zone portion. This indicates that the bosses 5F, 5G and 5H are disengaged or separated from the transmission case 4.

As can easily be seen from FIGS. 9 and 10, the boss 51 formed on the change housing 5 is located in the zone surrounded by the articulation portion 5, so that the boss 51 and the change shaft and selection 10 are located on the same side of the hinge portion 5. This can be confirmed from Figure 10, in which the threaded hole 5i is surrounded by the hinge portion 5J. This indicates that the boss 51 is disengaged or separated from the transmission case 4.

Referring to Figure 7 with continuous reference to Figure 9, with the bolt holes 35f, 35g, 35h and 35i held in alignment with the threaded coupling holes 5f, 5g, 5h and 5i, the second male components d '' mechanical fasteners in the form of five bolts 19F, 19G, 19H and 191 are inserted into the respective bolt holes 35f, 35g, 35h and 35i and threaded into the respective threaded holes 5f, 5g, 5h and 5i to attach the plate base 35 only at the change housing 5 (see also Figure 2).

Referring to Figure 9, the boss 5H is formed with a pin hole 5m dimensioned to receive a positioning pin, not shown. Referring to Figure 6, the upper surface of the change housing 5 is formed with an adjustment part 5M. The adjustment part 5M projects upwards from the upper surface of the change housing 5 so that the adjustment part 5M surrounds the change and selection shaft 10.

Referring to Figure 7, the bottom surface of the base plate is formed with an adjustment portion, not shown, and a pin hole, not shown, sized to receive a positioning pin. With the adjustment part 5M of the change case 5 fitting on the adjustment part of the base plate 35 and the pin hole of the base plate 35 and the pin hole 5M of the change case 5 by the positioning pin, the base plate 35 is positioned with respect to the change housing 5 to hold the bolt holes 35f, 35g, 35h and 35i in alignment relationship with the respective threaded holes 5f, 5g, 5h and 5i.

Referring to FIG. 2, the tank tank 36 includes or is formed with a concave element 36a which receives the bolt 191 used to attach the base plate 35 to the change housing 5.

As described, in the present implementation, the bosses 5A, 5B, 5C, 5D and 5E and the bolts 19A, 19B, 19C, 19D and 19E constitute the first male components of mechanical fasteners as claimed, and the threaded holes 4a, 4b, 4c, 4d and 4e constitute the first female components of mechanical fasteners as claimed. The bosses 35F, 35G, 35H and 351 and the bolts 19F, 19G, 19H and 191 constitute the second male components of mechanical fasteners as claimed, and the threaded holes 5f, 5g, 5h and 5i and the bosses 5F, 5G, 5H and 51 constitute the second female components of mechanical fasteners as claimed.

Each of the bolts 19F, 19G, 19H and 191 constitutes a mechanical fastener as claimed, and each of the bolt holes 35f, 35g, 35h and 35i constitutes a through hole as claimed. Each of the threaded holes 5f, 5g, 5h and 5i constitutes a tie hole as claimed. In the present implementation, the number of threaded holes 4a, 4b, 4c, 4d and 4e is five, the number of bosses 5A, 5B, 5C, 5D and 5E is five, the number of bosses 5F, 5G, 5H and 51 is four, and the number of bosses 35F, 35G, 35H and 351 is four. Note that their number is not limited to four or five.

Referring to Figure 3, in the case where the automatic transmission 1 is seen in the direction along the axis of the input shaft 6, it is understood that the clutch housing 3 is formed with a portion outer bulge 3A. Fa outer bulging portion 3A bombs more outward than the vertical wall extending vertically 4C of the transmission casing 4.

Referring also to Figure 4, the base plate 35 includes or is formed with an extension portion 35p. Fa extension portion 35p is located to define the end of the base plate 35 relative to the direction in which the base plate extends 35. Fa extension portion 35p extends outward the vertical wall 4C of the housing transmission 4 and extends to a side 3a of the outer bulging portion 3 A.

The extension portion 35p of the base plate 35 carries the hydraulic pressure generating device 32 so that the extension portion 35p has the tank tank 36 and the motor 37 on its upper surface side, and the pump hydraulic fluid 38 and the accumulator 39 on its lower surface side.

The effect is described below.

With the speed change unit 30 and the transmission case assembly 2 separated from each other but ready for assembly as shown in FIG. 11, the transmission case 4, the change shaft and selector 10 integrated with the change housing 5 and the gear change unit 30 are separated.

In the case where the change and selection shaft 10 is fixed to the transmission housing 4 from the state of FIG. 11, the change and selection shaft 10 is inserted into the transmission housing 4 via opening 4A (see Figure 5).

Subsequently, with the pin holes 4j and 4k aligned with the pin holes 5j and 5k by the positioning pins, the threaded holes 4a, 4b, 4c, 4d and 4e of the transmission housing 4 are kept in alignment relation with the bolt holes 5a, 5b, 5c, 5d and 5e.

Then the bolts 19A, 19B, 19C, 19D and 19E are inserted into the respective bolt holes 5a, 5b, 5c, 5d and 5e and threaded into the respective holes 4a, 4b, 4c, 4d and 4e to attach the bosses 5A , 5B, 5C, 5D and 5E with threaded holes 4a, 4b, 4c, 4d and 4e. This leads to the attachment of the change housing to the transmission housing 4 (see Figure 12).

After firmly fixing the change housing 5 to the transmission housing 4, with the upper portion of the change and selection shaft 10 extending through an opening 35a in the base plate 35, the base plate 35 is placed on the change housing 5.

With the adjustment part 5M of the change housing 5 fitting on the adjustment part of the base plate 35 and the pin hole of the base plate 35 and the pin hole 5 m of the change housing 5 by the positioning pin when the base plate 35 is placed on the change housing 5, the base plate 35 is positioned relative to the change housing 5 to hold the bolt holes 35f, 35g, 35h and 35i in a relation of alignment with the respective threaded holes 5f, 5g, 5h and 5i.

In FIG. 12, each of the bolt holes 35f, 35g, 35h and 35i and the coupling hole of the threaded holes 5f, 5g, 5h and 5i are connected by the mixed line at a point. After the base plate 35 is positioned relative to the change housing 5, the bolts 19F, 19G, 19H and 191 are inserted into the bolt holes 35f, 35g, 35h and 35i and threaded into the threaded holes 5f, 5g, 5h and 5i.

As described, with bolts 19F, 19G, 19H and 191, the bosses 35F, 35G, 35H and 351 are attached to the bosses 5F, 5G, 5H and 51, so that the base plate 35 is attached to the change housing 5 As a result, the speed change unit 30 is fixed firmly to the change case 5.

In the present implementation, the speed change unit 30, which automatically operates the change and selection shaft 10 so that it changes speed, does not require any modification of the transmission casing 4 unmodified because the the speed change unit 30 is firmly fixed to the change housing 5 carrying the change and selection shaft 10.

In detail, the shifting unit 30 is equipped with the base plate 35 (see Figure 7). It is with the base plate 35 that the speed change unit 30 is firmly fixed to the change case 5. The base plate 35 couples the speed change actuator 33 and the hydraulic pressure generation device 32 so that the shift actuator 33 can operate on the hydraulic pressure from the hydraulic pressure generating device 32 to linearly move the shift and selection shaft 10 in the selection direction along its axis and move angularly the change and selection shaft 10 in the direction of change around its axis.

Without modification of the transmission casing 4 which includes the threaded holes 4a, 4b, 4c, 4d and 4e (see FIG. 5), the change casing 5 is firmly fixed to the transmission casing 4 using such threaded holes 4a , 4b, 4c, 4d and 4th. The base plate 35 has or is formed with the bosses 35F, 35G, 35H and 351 (see Figure 7) which are formed with the bolt holes 35f, 35g, 35h and 35i. As described, with bosses 35F, 35G, 35H and 351, the base plate 35 is fixed firmly to the change housing 5.

The change housing 5 has or is formed with the bolt holes 5a, 5b, 5c, 5d and 5e (see Figures 9 and 10) which are used in conjunction with the threaded holes 4a, 4b, 4c, 4d and 4e (see Figure 5) to attach the change housing 5 to the transmission housing 4. In detail, the bolts 19A, 19B, 19C, 19D and 19E (see Figure 12) have the ability to pass through the bolt holes 5a , 5b, 5c, 5d and 5e and are threaded in the threaded holes 4a, 4b, 4c, 4d and 4e to attach the bosses 5A, 5B, 5C, 5D and 5E (see Figure 9) to the threaded holes 4a, 4b, 4c, 4d and 4e (see Figure 5).

The change housing 5 includes or is formed with the threaded holes 5f, 5g, 5h and 5i (see Figures 9 and 10) which are used in conjunction with the bolt holes 35f, 35g, 35h and 35i (see Figure 7) to attach the base plate 35 to the change housing 5. In detail, the bolts 19F, 19G, 19H and 191 (see Figure 2) have the ability to pass through the bolt holes 35f, 35g, 35h and 35i and are threaded in threaded holes 5f, 5g, 5h and 5i to attach the bosses 35F, 35G, 35H and 351 to the bosses 5F, 5G, 5H and 51 (see Figures 9 and 12). The bosses 5F, 5G, 5H and 51, which are formed with the threaded holes 5f, 5g, 5h and 5i, are disengaged or separated from the transmission casing 4 because, as can easily be seen from FIG. 10, the portion 5J joint separates the threaded holes 5f, 5g, 5h and 5i from the transmission housing 4.

With the above configuration, the base plate 35 is firmly fixed to the shift housing 5 by the bolts 19F, 19G, 19H and 191, allowing the shifting unit 30 to be firmly and constantly held outside the shift housing transmission 4.

In addition, among the bosses 5F, 5G, 5H and 51 used to attach the base plate 35 to the change housing 5, half or more of the bosses 5F, 5G and 5H (i.e. 3/4 in the present implementation) is disengaged or separated from the transmission casing 4, so that the base plate 35 can be held stably and firmly outside the transmission casing 4 without any major modification made to the structure of the transmission case assembly 2. This leads to improved productivity of automatic transmissions.

In addition, in the present implementation, the bosses 5F, 5G, 5H and 51 are formed only on the change housing 5 to allow the base plate 35 to be attached only to the change housing 5. This reduces the number of 'locations or points of the transmission housing assembly 2 which requires a reshaping, facilitating the transition from the transmission housing assembly of the conventional manual transmission to the manufacture of automatic transmissions. This leads to further improved productivity of automatic transmissions.

In addition, in the present implementation, the change housing 5 includes the annular articulation portion 5J which comprises or is formed with the bosses 5A, 5B, 5C, 5D, 5E, and the extension zone portions 5S and 5T extending outwards the articulation portion 5J (see FIGS. 9 and 10). The extension zone portions 5S and 5T comprise or are formed with the bosses 5F, 5G and 5H (see FIGS. 9 and 10). Since, at the level of the annular articulation portion 5J, the change housing 5 is fixed stably and firmly to the transmission housing 4, the shifting unit 30 is held more stably and firmly outside the housing transmission 4.

In the present implementation, the boss 51 is located on the same side of the articulation portion 5J as the change and selection shaft 10, so that the boss 51 is not located in the extension zone portions 5S and 5T. The boss 51 may be located in one of the extension zone portions 5S and 5T or in a newly proposed extension zone portion from the articulation portion 5J.

If this is the case, all the bosses 5F, 5G, 5H and 51 are disengaged or separated from the transmission case 4. This more effectively reduces the number of locations or points of the transmission case 2 assembly which requires remodeling. , resulting in further improved productivity of automatic transmissions.

In the present implementation, the tank tank 36 is formed with the concave element 36a which receives the bolt 191. The bolt 191 is used to attach the base plate 35 to the change housing 5. This makes it possible to place the bolt 191 and the bosses 51 and 351 at suitable locations for holding the gear change unit 30 outside the transmission casing 4 without being influenced by the location of the tank 36.

In the present implementation, the automated manual transmission (TMA) is used as an example of automatic transmission 1. As automatic transmission, automatic transmission (TA) can be used.

Although the disclosure relates to, but is not limited to, the present implementation, it will be apparent to those skilled in the art that modifications can be made without departing from the scope of the present invention.

... Automatic transmission ; 2 ... Transmission housing assembly; 4 ... Transmission housing; 4a, 4b, 4c, 4d, 4th ... Threaded hole (first female component of mechanical fastener); 5 ... Change housing, 5A, 5B, 5C, 5D,

5E ... Boss (first male mechanical attachment component), 5F, 5G, 5H,

51 ... Boss (second female mechanical attachment component), 5J ... Hinge portion, 5S, 5T ... Extension zone portion, 5f, 5g, 5h, 5i ... Threaded hole (attachment hole or second female mechanical attachment component), 19A, 19B,

19C, 19D, 19E ... Bolt (first male mechanical fastener component), 19F, 19G,

19H, 191 ... Bolt (second male mechanical attachment component), 30 ... Gear change unit, 32 ... Hydraulic pressure generation device (gear change unit drive device ), 33 ... Gear change actuator (or gear change unit actuator), 10 35 ... Base plate (gear change unit), 35F, 35G, 35H,

351 ... Boss (second male mechanical fastener component), 35f, 35g, 35h,

351 ... Bolt hole (through hole), 36 ... Reservoir tank (of drive device), 36a ... Concave element, 37 ... Motor (of drive device & hydraulic fluid supply), 38. .. Hydraulic fluid pump (drive device & hydraulic fluid supply),

39 ... Accumulator (drive device & hydraulic fluid supply).

Claims (5)

1. Automatic transmission (1) comprising: a transmission housing (4); a change housing (5) supporting a change and selection shaft (10); and a speed change unit (30; 32, 33, 35) configured to automatically operate the change and selection shaft (10) to change speed, T speed change unit (30) including an actuator (33) for the change and selection shaft (10), a drive device (32) for the actuator (33), and a base plate ( 35), held fixed relative to the transmission housing (4), configured to couple the drive device (32) to the actuator (33), the transmission housing (4) comprising a group of a plurality of first female components of mechanical fasteners (4a, 4b, 4c, 4d, 4e); the base plate (35) having a group of a plurality of second male components of mechanical fasteners (35f, 35g, 35h, 35i; 19F, 19G, 19H, 191); the change housing (5) having a group of a plurality of first male mechanical fastener components (5a, 5b, 5c, 5d, 5e) which are used in conjunction with the group of the plurality of first female fastener components mechanical (4a, 4b, 4c, 4d, 4e) for attaching the change housing (5) to the transmission housing (4), the change housing (5) having a group of a plurality of second female fastener components mechanical (5f, 5g, 5h, 5i) which are used together with the group of the plurality of second male components of mechanical fasteners (35f, 35g, 35h, 35i; 19F, 19G, 19H, 191) to attach the plate base (35) to the change housing (5), at least some of the plurality of second female components of mechanical fasteners (5F, 5G, 5H, 51; 5f, 5g, 5h, 5i) being disengaged from the transmission housing ( 4). 2. Automatic transmission (1) according to claim 1, wherein the entire plurality of second female components of mechanical fasteners (5f, 5g, 5h, 5i) is disengaged from the transmission housing (4). 3. Automatic transmission (1) according to claim 1 or 2, wherein only the change housing (5) is formed with all of the plurality of second female components of mechanical fasteners (5f, 5g, 5h, 5i) . 4. Automatic transmission (1) according to any one of claims 1 to 3, in which the change housing (5) includes an annular articulation portion (5J) at the level of which the change housing (5) comes contact with the transmission casing (4) and at least one portion of the extension zone (5S, 5T) which extends the articulation portion (5J); at least one of the plurality of second female mechanical fastener components (5f, 5g, 5h, 5i) of the group is in the extension zone portion (5S, 5T). 5. Automatic transmission (1) according to any one of claims 1 to 4, in which each of the plurality of second male components of mechanical fasteners of the group includes a mechanical fastener (19F, 19G, 19H, 191) and a hole through (35f, 35g, 35h, 35i) through which the mechanical fastener passes; each of the plurality of second female mechanical fastener components of the group includes a fastening hole (5f, 5g, 5h, 5i) engaged on the mechanical fastener (19F, 19G, 19H, 191); the drive device (32) includes a reservoir tank (36) which retains the hydraulic fluid, a supply of hydraulic fluid (37, 38, 39) which supplies the hydraulic fluid from the reservoir tank (36) to the actuator (33); and the tank (36) includes a concave element (36a) which receives the mechanical fastener (191). 1/12