JP3368021B2 - Electronically controlled transmission - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronically controlled transmission, and more particularly, to a shift drum or a compact shift drum arrangement space. 2. Description of the Related Art In a conventional manual transmission for a vehicle, each shift rod is usually connected to a shift lever, and the shift is operated by operating the shift lever. As described in JP-A-64-46049, a shift drum and an electric actuator for rotating the shift drum are provided, and a shift groove corresponding to each shift rod is formed on an outer peripheral surface of the shift drum. The shift rod is formed by engaging the engagement portion at the base end of each shift rod with the corresponding shift groove and rotating the shift drum in accordance with the operation of the shift lever. Electronically controlled transmissions have been proposed. In the electronically controlled transmission, the shift drum is formed as a columnar or cylindrical integral product, and the shift drum is supported so as to be rotatable about the axis and immovable in the axial direction. The shift groove is a groove that makes one round of the shift drum, and a neutral groove portion of each shift groove is formed in a groove that is located in a plane perpendicular to the axis of the shift drum. The inter-gear rotation phase angles are formed equal. [0004] In a conventional electronically controlled transmission, the shift drum is usually arranged at the top of a transmission gear mechanism or the like. Since the total height of the transmission is increased by a plurality of shift rods, a driving device that rotationally drives the shift drum, and the like, it is required to reduce the size of the shift drum or the space for disposing the shift drum. SUMMARY OF THE INVENTION It is an object of the present invention to provide an electronically controlled transmission that can reduce a shift drum or its installation space. An electronic control transmission according to a first aspect of the present invention includes a transmission gear mechanism provided in a driving force transmission system of a vehicle, and the transmission gear mechanism is selected in a plurality of shift positions. All at once
Multiple synchronizers for switching and these multiple synchronizers
Connected to a plurality of shift forks respectively engaging with
For a plurality of shift rods, a predetermined distance in the length direction of the rod
A plurality of shift rods that can move
Shift grooves having a plurality of shift grooves corresponding to
And a plurality of engagement portions of a plurality of shift rods.
And engage the shift grooves to drive the shift drum.
An electronically controlled transmission that shifts the shift drum by rotating the shift drum; and displacing means for axially displacing the shift drum in synchronization with the rotation of the shift drum. Each of the grooves is formed as a groove extending over two circumferences of the outer peripheral surface of the shift drum, and a neutral groove portion of each of the shift grooves is formed in a spiral shape. [0006] In [Action and Effect of the Invention] electronically controlled transmission of claim 1 is in the shift drum is rotated by rotation driving means, in synchronism with the rotation of the drum Shifutodora
Displacement means for shifting the system in the axial direction is provided.
Grooves are formed in two grooves on the circumference of the shift drum
Then, the neutral groove portion of each shift groove was formed in a spiral shape.
By rotating the shift drum, multiple shift rods
May move unnecessarily in the axial direction of the shift drum.
You. However, the rotation direction by the rotation driving means and the displacement means
The direction of displacement due to
Is set to the shift speed due to the rotation of the shift drum.
The unnecessary movement of the ram in the axial direction can be
It can be configured to cancel out. As a result, the shift groove can be formed using the length of the two circumferences of the peripheral surface of the shift drum.
/ 2, and downsizing of the shift drum can be achieved. Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present embodiment is an example in which the present invention is applied to an electronic control transmission interposed in a driving force transmission system of a rear-wheel drive type automobile for riding. Although it is arranged, the front, rear, left and right of the body of the automobile will be defined as front, rear, left and right. As shown in FIGS. 1 to 3, the transmission TM is provided with a clutch mechanism 10, a transmission gear mechanism 40, a shift mechanism 70 for performing a shift operation of the transmission gear mechanism 40, and the like. The transmission gear mechanism 4 is controlled by driving and controlling the shift mechanism 70.
A hydraulic system and a control system for controlling 0 are also provided. As shown in FIG. 1, the clutch mechanism 10 includes a flywheel 11 connected to an output shaft of an engine.
Is similar to a general pull-type clutch mechanism for intermittently connecting the input shaft 12 of the transmission TM with a manual operation force input mechanism operatively connected to a clutch pedal. 13 and an automatic operation force input mechanism 14. In this clutch mechanism 10, a clutch disk 15, a pressure plate 16, a diaphragm spring 17, a release bearing 18 and the like are the same as those of an existing clutch. In the manual operation force input mechanism 13, a clutch cylinder 20 operatively connected to a clutch pedal via a hydraulic system is provided on a rear wall portion of a left side portion of a casing 19 of the clutch mechanism 10. The output rod 23 is engaged with the release bearing 18 via the first release fork 21, and when the clutch pedal is depressed, hydraulic pressure is supplied to the clutch cylinder 20 and the output rod 23 advances and moves, and the release rod 18 is moved.
Is pushed rearward, and the clutch mechanism 10 is disconnected. In the automatic operating force input mechanism 14, a hydraulic actuator 25 composed of a hydraulic cylinder is attached to the rear wall of the right side of the casing 19, and its output rod 27 is released via a second release fork 28. The hydraulic actuator 25 is engaged with the bearing 18, and is provided with an electromagnetic control valve 26 including a plurality of solenoid valves 26 a for switching an oil passage. When hydraulic pressure is supplied to the hydraulic actuator 25, the output rod 27 advances. Then, the release bearing 18 is pushed rearward, and the clutch mechanism 10 is disconnected. It is needless to say that a push-type clutch mechanism can be applied in place of the pull-type clutch mechanism 10 described above. Next, the transmission gear mechanism 40 will be described. As shown in FIGS. 1 and 2, the transmission gear mechanism 40 has the same configuration as a general manual transmission gear mechanism capable of switching between first gear to fifth gear and reverse. I do. In this gear shift mechanism 40,
The casing includes a box-shaped first case member 41 and a cylindrical second case member 41.
It is composed of a case member 42, a wall-shaped third case member 43, a box-shaped fourth case member 44, and the like. In the casing, a main shaft 45 and a counter shaft 46 are arranged at predetermined intervals vertically so that their axes are parallel (that is, the axis of the main shaft 45 and the counter shaft 46).
Are arranged so that the plane including the center of the axis becomes a vertical plane. An input gear 47 formed on the input shaft 12 meshes with an input gear 48 at the front end of the counter shaft 46. An input gear 48, a third gear 53, and a second gear 5 are provided on the counter shaft 46 in this order from the front.
A gear train 50 including a second gear 51, a reverse gear 49, and a fifth gear 55 is provided, and a main shaft 45 is provided with a free-running gear 3 corresponding to the gears 53, 52, 51, 49, and 55, respectively. High gear 63, second gear 62, first gear 61,
A gear train 60 including a reverse gear 66 and a fifth gear 65 is provided. Further, the main shaft 45 has a fourth speed / 3
A first synchronizer 67 for speed change is provided, a second synchronizer 68 for second speed / 1 speed change, and a third synchronizer 69 for reverse / 5 speed change. When the first synchronizing device 67 is switched to the front position, the speed becomes the fourth speed in which the rotation is transmitted directly from the input shaft 12 to the main shaft 45, and when the first synchronizer 67 is switched to the rear position, the speed becomes the third speed.
When the second synchronizer 68 is switched to the front position, the second speed is established, and when the second synchronizer 68 is switched to the rear position, the first speed is established. Third synchronizer 6
9 is switched to the front position, the rotation of the reverse gear 49 becomes
The reverse is transmitted to the main shaft 45 via the reverse shaft gear and the reverse gear 66, and the gear shifts to the fifth speed when switched to the rear position. Next, the first to third synchronizers 67 to 69
(See FIGS. 1 to 4). The shift mechanism 70 includes first to third shift rods 71, 72, 73 for switching the first to third synchronizers 67 to 69, respectively, and shift grooves 81, corresponding to the three shift rods 71 to 73, respectively. It comprises a shift drum 80 having 82 and 83, a rack and pinion mechanism 90 for rotating the shift drum 80 in forward and reverse directions, and the like. The shift drum 80 includes a gear train 60 of the main shaft 45 and a gear train 5 of the counter shaft 46.
0, at a position largely offset rearward in the axial direction and near a top end of a rear end portion of the transmission TM, in parallel with the main shaft 45 and the counter shaft 46, and
It is disposed right above the main shaft 45 at a predetermined distance from the main shaft 45. The shift drum 80 has a slightly large-diameter drum main body portion 84 and shaft portions 85 and 86 extending integrally from front and rear ends thereof, and the third case member 43 of the casing and the third case member 43 via the shaft portions 85 and 86. The fourth case member 44 is rotatably supported by the four case members 44, and the fourth case member 44
A drum cover 44a is formed near the upper portion of the shift drum 80 to cover the upper portion. The shift balam 80 is a conventional normal system.
Formed on a shift drum about half the diameter of the shift drum,
Shift grooves 81, 82, 83 corresponding to the first to third shift rods 71, 72, 73 are formed on the outer peripheral surface of the drum main body 84 of the shift drum 80 in order from the front side. That is, the shift grooves 81, 82, and 83 corresponding to the first to third synchronizers 67, 68, and 69 are formed in the same order as the synchronizers. However, it is not always necessary to match the arrangement order. The shift grooves 81, 82, 83 are
Formed in a spiral groove over two circumferences of the outer circumference of the drum 80
Have been. FIG. 4 shows two rounds of the outer circumference of the shift drum 80.
The development view of the shift grooves 81, 82, 83 over the
It is. First to third shift rods 71, 72, 73
Are arranged in the front-rear direction through the wall of the casing so as to be movable by a predetermined distance in the front-rear direction.
The shift forks 74, 75, 76 fixed to the third shift rods 71, 72, 73, respectively, are relatively rotatably engaged with the outer peripheral grooves of the sleeves of the first to third synchronization devices 67, 68, 69, respectively. I have. The drum body 84 has shift grooves 81, 8
Three cylindrical bodies 87, 8 are provided so as to cover the outer peripheral sides of
8, 89 are rotatably fitted to the outside, and cylindrical bodies 87, 88,
Rollers 71a, 7 provided in a protruding manner inside 89, respectively.
2a, 73a (see FIG. 4) are shift grooves 81, 82, 8
3 are slidably engaged with the cylindrical members 87, 88, 89, respectively.
Are fixed to base end portions of the first to third shift rods 71, 72, 73 via arm members 77, respectively. However, the cylinders 87 to 89 are omitted, and the rollers 71a, 72
a and 73a may be fixed to the base ends of the shift rods 71 to 73, respectively. Here, the three shift grooves 81 and 8 in FIG.
As shown in the development view of 2,83, b Schiff Toroddo 72
When the roller 72a is at the first speed position P1, the first speed is established.
In the second gear position P2, the second gear is established. Shi
When the roller 71a of the lift rod 71 is at the third speed position P3
3rd gear, and 4th gear at the 4th gear position P4
The gear is set. The roller 73a of the shift rod 73
At the speed position P5, the fifth speed is established, and
At the position PR, the reverse gear is set. In addition, shift groove
“1” to “5”, “R” described beside 81 to 83
Indicates the first to fifth speeds and the reverse position, respectively. By the way, as described above, the shift grooves 81, 8
2 and 83, the rollers 71a, 72a, 73a
Are the straight neutral grooves of the shift grooves 81, 82, 83
When the shift drum 80 rotates.
The shift rods 71 to 73 move in the axial direction.
Therefore, the amount of movement in the axial direction is
The shift drum 80 can be moved in the axial direction according to the rotation.
And the following displacement mechanism 120 (displacement hand)
Step) is provided. FIG. 6 shows the displacement mechanism 120.
To explain, the inside of the front part of the shift drum 80
Has a screw hole 121 opened at the front end of the shift drum 80.
A male screw member 122 is formed in the screw hole 121.
The male screw member 122 is slidably screwed into the wall-shaped third member.
It is fixed to the case 43. Further, the shift drum 80
The rear end of the shift drum 80 has a spout
A line hole 123 is formed.
The spline portion 124a of the spline shaft 124 extends in the axial direction.
The shift drum 80 is movably engaged with the spline shaft.
124 so that it can move relative to the axial direction and rotate integrally
It is composed. The shift drum 80 is indicated by the arrow U in FIG.
Spiral of the shift groove when making one rotation in the upshift direction
Assuming that the amount of backward screwing is A,
The ram 80 is moved forward by the distance A by the displacement mechanism 120.
The screwing amount A is
The movement distance of the mechanism 120 is offset. In addition, shifted
When the ram 80 is reversely driven in the downshift direction
Is screwed amount of forward that by the spiral of the shift groove, the displacement mechanism
120 offset by the distance traveled behind shift drum 80 by
Will be. Therefore, the shift grooves 81, 82, 83
The same function as in the case of forming the ring is obtained. In addition, this
The rack and pinion mechanism 90 in the shift mechanism is
The drum 80 can be driven forward and reverse for two rotations.
Has been established. Regarding the rack and pinion mechanism 90,
A shaft portion 86 on the rear side of the shift drum 80 has a pinion 93
Is fixed, and the rack member 9 meshed with the pinion 93
As shown in FIG. 3, the case member 95 of the rack unit including the rack member 94 is disposed so as to have an angle of attack of about 30 degrees with respect to the horizontal plane and to be positioned higher leftward. At both end portions, first and second hydraulic actuators 91 and 92 each composed of a hydraulic cylinder are provided, and an output rod 91a of the first hydraulic actuator 91 is provided.
Is fixed to the left end of the rack member 94, and the output rod 92a of the second hydraulic actuator 92 is fixed to the right end of the rack member 94. The oil chamber 91b of the first hydraulic actuator 91
When the hydraulic pressure is discharged from the oil chamber 92b of the second hydraulic actuator 92 while supplying the hydraulic pressure to the second hydraulic actuator 92, the rack member 94 moves rightward, and the pinion 93 rotates clockwise in rear view. On the contrary, while discharging the oil pressure of the oil chamber 91b,
When the oil pressure is supplied to the oil chamber 92b, the rack member 94 moves leftward, and the pinion 93 rotates counterclockwise. Therefore,
By controlling the supply, discharge, and flow of the hydraulic pressure to the hydraulic actuators 91 and 92, the shift drum 80 can be driven to rotate in a desired direction at a desired speed. In FIG. 3, reference numeral 96 in FIG . 3 indicates that oil is scattered on the shift drum 80 and the main shaft 4
Reference numeral 97 denotes a fin of the rotor member 96, and reference numerals 97 to 103 denote sensors for detecting the rotation state (the rotation speed and the rotation direction) of the main shaft 45. In the manual mode, the control device of the electronically controlled transmission basically transmits the hydraulic actuator 25 and the first and second hydraulic actuators 91 and 91 of the rack and pinion mechanism 90 in response to a command from the shift lever.
92 and an electrically controlled throttle valve mechanism provided in the intake system of the engine to control the drive of the shift drum 80 so as to achieve the commanded gear position.
The description is omitted because it is not directly related to the present application. [0028] Among the advantages of the electronic control transmission has been described, with <br/> Te described function and effect of the shift drum and the shift groove, the shift groove 81, 82 and 83 Shifutodora
A spiral mechanism is formed over the outer circumference of the outer periphery of the
120, the shift drum 80 can be
Approximately 1/2 the diameter of the shift drum
Therefore, the shift mechanism 70 can be reduced in size and weight.
Quantitative and production costs can be reduced.
Fruit is obtained. Next, a description will be given of a modification in which the embodiment is partially changed . 1 ) Instead of a pinion of the rack and pinion mechanism 90, a sprocket may be provided, a chain member may be wound around the sprocket, and the chain member may be driven by a pair of left and right hydraulic actuators. Instead of the rack and pinion mechanism, an electric driving means for rotatingly driving the shift drum 80 with an electric motor may be provided. 2 ) Rollers 71 a to 73 a fixed to the base ends of the shift rods 71 to 73 without the cylinders 87 to 89 at the base ends of the shift rods 71 to 73 are directly engaged with the shift grooves 81 to 83. A configuration in which they are combined may be adopted. It goes without saying that various changes can be made without departing from the spirit of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional plan view of an electronically controlled transmission according to an embodiment of the present invention . FIG. 2 is a longitudinal sectional side view of the electronic control transmission of FIG. 1; FIG. 3 is a sectional view taken along line 3-3 of FIG. 2; FIG. 4 is a development view of a shift groove on a peripheral surface of the shift drum of FIG. 1; FIG. 5 is a plan view of a main part including a shift drum. FIG. 6 is a cross-sectional plan view of a main part including the shift drum of FIG. 5; [Description of Signs] TM Electronically controlled transmission 40 Transmission gear mechanism 71, 72, 73 Shift rod 74, 75, 76 Shift fork 80 Shift drum 81, 82, 83 Shift groove 90 Rack / pinion mechanism 113 Drive shaft 120 Displacement mechanism

Continuation of front page (56) References JP-A-54-116551 (JP, A) JP-A-64-46046 (JP, A) JP-A-64-46049 (JP, A) JP-A-57-65449 (JP) , A) JP-B-45-15321 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16H 61/26-61/36 F16H 63/00-63/38

Claims (1)

(57) Claims 1. A transmission gear mechanism provided in a driving force transmission system of a vehicle, and the transmission gear mechanism is selected in a plurality of shift positions.
A plurality of synchronizers for switching in a unified manner;
Connected to multiple shift forks, each of which engages a starting device
Multiple shift rods in the length direction of the rod
A plurality of shift rods that can move a predetermined distance and a plurality of shift rods
Has multiple shift grooves on the outer peripheral surface, each corresponding to a Trod
And a shift drum having a plurality of shift rods.
Engage the shift grooves and rotate the shift drum.
An electronically controlled transmission that performs a shift by moving , comprising: a rotation drive unit that rotationally drives the shift drum; and a displacement unit that displaces the shift drum in an axial direction in synchronization with rotation of the shift drum. Of the shift groove on the outer peripheral surface of the shift drum.
An electronically controlled transmission, wherein the transmission groove is formed in a circumferential groove, and a neutral groove portion of each of the shift grooves is formed in a spiral shape.