WO2022185416A1

WO2022185416A1 - Transmission

Info

Publication number: WO2022185416A1
Application number: PCT/JP2021/007983
Authority: WO
Inventors: 忠彦加藤; 義弘山内; 泰雅中條
Original assignee: 株式会社ユニバンス
Priority date: 2021-03-02
Filing date: 2021-03-02
Publication date: 2022-09-09
Also published as: JPWO2022185416A1; JP7477708B2

Abstract

Provided is a transmission for which the calculation accuracy of the rotation angle of second teeth can be improved. The transmission comprises: a plurality of idle gears disposed on a first shaft (12) and provided with first teeth (33); a plurality of movable members (37) disposed on the first shaft so as to be inhibited from relatively rotating and to be movable in the axial direction and provided with second teeth (38) meshed with the first teeth; a fixed gear disposed on a second shaft (13) and meshed with each of the idle gears; a sensor which directly or indirectly detects the rotation of the first teeth and the second teeth; and a control device (60) which acquires positions of the first teeth and the second teeth in a rotation direction on the basis of the detection by the sensor and which starts to move the movable members in the axial direction. The first shaft includes a mark (58) rotated integrally with the first shaft, and the position of the second teeth in the rotation direction has a fixed relationship with respect to the position of the mark in the rotation direction.

Description

transmission

The present invention relates to a transmission that selectively couples gears arranged on a shaft to the shaft.

An idle gear provided with a first tooth and a moving member provided with a second tooth are arranged on a first shaft, and a fixed gear meshing with the idle gear is arranged on a second shaft arranged parallel to the first shaft. Transmissions are known which are arranged to initiate axial movement of a moving member by means of a controller to engage first and second teeth to selectively couple an idler gear to a first shaft. In this type of transmission, in the technique disclosed in Patent Document 1, a plurality of sleeves (moving members) provided with sleeve teeth (second teeth) are arranged on the input shaft (first shaft), and the output shaft A sensor detects the rotation of any of the transmission gears (fixed gears) arranged on the (second shaft). A fixed gear arranged on the second shaft meshes with a transmission gear (idling gear) arranged on the first shaft, and the moving member rotates integrally with the first shaft. The controller calculates the rotation angle of the second tooth based on the sensor input.

JP 2020-85066 A

However, in the prior art, when a plurality of moving members are arranged on the first shaft with the positions of the second teeth in the rotation direction different from each other, the initial positions of the second teeth in the rotation direction with respect to the first shaft are different from each other. , the accuracy of the rotation angle calculated with reference to the initial position decreases.

The present invention has been made to solve this problem, and it is an object of the present invention to provide a transmission capable of improving the accuracy of calculating the rotation angle of the second tooth.

To achieve this object, the transmission of the present invention is provided with a first shaft and a second shaft arranged parallel to each other, and a first tooth arranged so as to be rotatable relative to the first shaft and immovable in the axial direction. a plurality of free-rotating gears mounted on a first shaft so as to be non-rotatable relative to each other and axially movable, a plurality of moving members provided with second teeth meshing with the first teeth; and a second shaft non-rotatable relative to each other. A fixed gear that is arranged in and meshes with the idle gear, a sensor that directly or indirectly detects the rotation of the first tooth and the second tooth, and the position of the first tooth and the second tooth in the rotational direction based on the detection of the sensor a controller for acquiring and initiating axial movement of the moving member. The first axis includes a mark that rotates integrally with the first axis, and the rotational position of the second tooth is in a fixed relationship to the rotational position of the mark.

According to the first aspect, the first shaft includes a mark that rotates integrally with the first shaft, and the rotational position of the second tooth has a fixed relationship to the rotational position of the mark. Since the initial position of the second tooth in the direction of rotation can be made constant, the accuracy of calculation of the rotation angle of the second tooth can be improved.

According to the second aspect, the position of the first tooth in the rotation direction when the idle gear is arranged on the first shaft and the fixed gear is arranged on the second shaft in a state where the idle gear and the fixed gear are in mesh. has a constant relationship with respect to the position in the rotational direction of the second axis. In addition to the effects of the first aspect, the number of sensors that detect the rotation of the first tooth can be reduced.

According to the third aspect, the sensor includes a second sensor that detects rotation of the second shaft, idle gear or fixed gear. The control device stores a value obtained by integrating the detection of the second sensor from the time when the idle gear is arranged on the first shaft and the fixed gear is arranged on the second shaft while the idle gear and the fixed gear are in mesh with each other. and the second computing unit acquires the position of each first tooth in the rotational direction from the initial position based on the integrated value stored in the memory and the gear ratio between the idle gear and the fixed gear. In addition to the effect of the second aspect, the rotation angle of each first tooth can be calculated with high accuracy.

According to the fourth aspect, the sensor includes a third sensor that detects rotation of the second shaft or a gear in a gear different from the gear whose rotation is detected by the second sensor. The control device acquires the position of the gear or the second shaft in the rotational direction based on the detection of the third sensor, and stores the position of the gear or the second shaft in the rotational direction acquired by the third arithmetic unit and the memory. A comparison unit compares the position in the rotational direction of the gear or the second shaft acquired based on the value stored in . In addition to the effects of the third aspect, the functions of the control device and sensors can be verified.

1 is a block diagram of a transmission in one embodiment; FIG. FIG. 3 is a perspective view of a hub and moving member; 4 is a flow chart of a meshing process; 6 is a flowchart of correction processing;

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. First, the schematic configuration of the transmission 10 will be described with reference to FIG. FIG. 1 is a block diagram of transmission 10 in one embodiment. The transmission 10 includes a first shaft 12 arranged coaxially with a drive shaft 11 to which power is input, and a second shaft 13 arranged parallel to the first shaft 12. An output gear 14 is arranged. The transmission 10 includes a fixed gear 15 fixed to the drive shaft 11 so as not to relatively rotate, and a fixed gear 16 which meshes with the fixed gear 15 and is fixed to the second shaft 13 so as not to rotate relatively. The first shaft 12 and the second shaft 13 support a 1st gear 17, a 2nd gear 20, a 3rd gear 23, a 4th gear 26, a 5th gear 27 and a 6th gear 30 as multi-stage transmission gears. . In this embodiment, the transmission 10 is mounted on an automobile (not shown).

The first speed gear 17 includes an idle gear 18 fixed to the first shaft 12 so as to be relatively rotatable, and a fixed gear 19 meshing with the idle gear 18 and fixed to the second shaft 13 so as not to be relatively rotatable. ing. The second speed gear 20 includes an idle gear 21 fixed to the first shaft 12 so as to be relatively rotatable, and a fixed gear 22 which meshes with the idle gear 21 and is fixed to the second shaft 13 so as not to be relatively rotatable. ing. The third speed gear 23 includes an idle gear 24 fixed to the first shaft 12 so as to be relatively rotatable, and a fixed gear 25 meshing with the idle gear 24 and fixed to the second shaft 13 so as not to be relatively rotatable. ing.

The 4th speed gear 26 consists of the output gear 14 . The fifth speed gear 27 includes an idle gear 28 fixed to the first shaft 12 so as to be relatively rotatable, and a fixed gear 29 meshing with the idle gear 28 and fixed to the second shaft 13 so as not to be relatively rotatable. ing. The sixth speed gear 30 includes an idle gear 31 fixed to the first shaft 12 so as to be relatively rotatable, and a fixed gear 32 meshing with the idle gear 31 and fixed to the second shaft 13 so as not to be relatively rotatable. ing.

The end faces of the fixed gear 15 and the

idle gears

18, 21, 24, 28, and 31 are provided with square-shaped first teeth 33 protruding in the axial direction. The fixed gear 15 and the

idle gears

18, 21, 24, 28, 31 have the same number, size and shape of the first teeth 33. As shown in FIG. A hub 34 provided axially adjacent to the first tooth 33 is coupled to the first shaft 12 . A moving member 37 is arranged on the hub 34 .

2 is a perspective view of the hub 34 and the moving member 37. FIG. The hub 34 is a cylindrical member having splines 35 on its inner peripheral surface. Hub 34 is connected to first shaft 12 by splines 35 . A groove 36 extending in the axial direction is provided on the outer peripheral surface of the hub 34 . The moving member 37 is an annular member arranged on the outer peripheral surface of the hub 34 . A square-shaped second tooth 38 protruding in the axial direction is provided on the axial end face of the moving member 37 .

In this embodiment, eight second teeth 38 are provided on the end surface of the moving member 37 at 45° intervals (16 on one moving member 37). Similarly, eight first teeth 33 (see FIG. 1) are provided at 45° intervals on the end face of each gear. The second tooth 38 is provided with a projection 39 elongated in the axial direction. A protrusion 39 fits into the groove 36 of the hub 34 . Therefore, the moving member 37 is arranged on the hub 34 so as to be non-rotatable and axially movable with respect to the hub 34 .

Return to Figure 1 for explanation. The shift device 40 sets the axial position of the moving member 37 . The shift device 40 includes

shift forks

41, 42, 43 respectively engaged with the moving member 37, shift

arms

44, 45, 46 respectively coupled to the

shift forks

41, 42, 43, a cylindrical shift drum 47, It has Shift fork 41 engages with moving member 37 arranged between fixed gear 15 and sixth gear 30 . Shift fork 42 engages with moving member 37 arranged between fifth gear 27 and second gear 20 . The shift fork 43 engages with a moving member 37 arranged between the 3rd gear 23 and the 6th gear 30 .

The shift drum 47 is rotated by an actuator 48 such as a motor.

Cam grooves

49 , 50 , 51 are provided on the outer circumference of the shift drum 47 . The engaging portion 52 coupled to the shift arm 44 engages the cam groove 49 . An engaging portion 53 coupled to the shift arm 45 engages the cam groove 50 . An engaging portion 54 coupled to the shift arm 46 engages the cam groove 51 .

The control device 60 determines a request for shifting gears based on an operation signal of a shift lever (not shown) or based on an accelerator opening and a vehicle speed signal by operating an accelerator pedal (not shown), and shifts. The drum 47 is rotated. When the shift drum 47 (cylindrical cam) rotates, the

shift forks

41, 42, 43 are shifted through the

shift arms

44, 45, 46 whose

engaging portions

52, 53, 54 are guided in the

cam grooves

49, 50, 51, respectively. moves axially. As the

shift forks

41, 42, 43 move, the moving member 37 moves in the axial direction. When the moving member 37 moves in the axial direction and the first teeth 33 provided on the fixed gear 15 and the

idle gears

18, 21, 24, 28, 31 mesh with the second teeth 38 provided on the moving member 37, , the

free gears

18, 21, 24, 28, 31 and the drive shaft 11 are selectively connected to the first shaft 12 via the moving member 37 and the hub 34 to complete the speed change.

In the transmission 10, the first tooth 33 and the second tooth 38 are meshed in a state where the rotational speed of the fixed gear 15 and the

idle gears

18, 21, 24, 28, 31 and the rotational speed of the moving member 37 are different. be. At this time, if the corner portions of the first tooth 33 and the second tooth 38 come into contact with each other, the first tooth 33 and the second tooth 38 may be damaged or worn, or the first tooth 33 and the second tooth 38 may be repelled. There is a possibility that the first tooth 33 and the second tooth 38 may not mesh with each other. In order to prevent this, the control device 60 predicts the rotational position of the first tooth 33 and the rotational position of the second tooth 38 so that the corner portions of the first tooth 33 and the second tooth 38 do not come into contact with each other. , the first tooth 33 and the second tooth 38 are meshed.

The outputs of the first sensor 55 , the second sensor 56 and the third sensor 57 are input to the control device 60 . The first sensor 55, the second sensor 56, and the third sensor 57 are sensors that detect the rotation angles of rotating bodies such as shafts and gears. The first sensor 55, the second sensor 56, and the third sensor 57 may be rotary potentiometers, encoders, or the like. The first sensor 55, the second sensor 56, and the third sensor 57 can be either non-contact sensors or contact sensors using magnetism, ultrasonic waves, optical elements, or the like.

The first sensor 55 detects rotation of the first shaft 12 and inputs the detection result to the control device 60 . In this embodiment, the first sensor 55 detects rotation of the mark 58 that rotates integrally with the first shaft 12 . A mark 58 is a mark for identifying rotation of the first shaft 12 . In this embodiment, the mark 58 is a gear fixed to the first shaft 12 so as not to rotate relative to it.

In this embodiment, the second sensor 56 detects rotation of the fixed gear 16 arranged on the second shaft 13 and inputs the detection result to the control device 60 . The third sensor 57 detects rotation of the idle gear 18 arranged on the first shaft 12 and inputs the detection result to the control device 60 . The warning device 59 is provided at a position where the driver of the automobile can identify the notification, and notifies the driver by sound or light.

The control device 60 is a device that controls various operations of the transmission 10 . The control device 60 includes a CPU 61 , nonvolatile memory (NVRAM) 62 , ROM and RAM (not shown), which are connected to an input/output port 63 . An actuator 48 , a first sensor 55 , a second sensor 56 , a third sensor 57 and an alarm device 59 are connected to the input/output port 63 .

The CPU 61 is an arithmetic device that controls each part. A ROM (not shown) is a non-rewritable, non-volatile memory that stores control programs executed by the CPU 61 and various threshold values. A RAM (not shown) is a memory that rewritably stores various data. The NVRAM 62 is a non-volatile memory that rewritably stores data. The CPU 61 sequentially processes the signals input by the first sensor 55 , the second sensor 56 and the third sensor 57 and stores them in the RAM and NVRAM 62 .

In the assembly process of assembling the transmission 10, the first shaft 12 is arranged so that the position of the second tooth 38 in the rotational direction has a constant relationship with the position of the mark 58 provided on the first shaft 12 in the rotational direction. , the hub 34 and the moving member 37 are arranged. Since the positions in the rotational direction of all the second teeth 38 are constant with reference to the mark 58, the initial positions in the rotational direction of all the second teeth 38 are constant. Since the second teeth 38 (moving members 37) rotate integrally with the first shaft 12, all the second teeth 38 have the same rotation angle. Therefore, even if a sensor for detecting the rotation of the second tooth 38 is not arranged for each moving member 37, if there is one sensor for directly or indirectly detecting the rotation of the second tooth 38, the control device 60 can detect all the second teeth. Rotation of the two teeth 38 can be detected.

In this embodiment, rotation of the second tooth 38 is indirectly detected by the first sensor 55 that detects rotation of the mark 58 . The CPU 61 sequentially processes the signals input by the first sensor 55, and stores in the RAM the rotation angle θd of the second tooth 38 that increases from the initial position (0°). The rotation angle θd of the second tooth 38 increases from 0° to 45° and then returns to 0°. The CPU 61 also causes the RAM to store the rotation speed of the first shaft 12 based on the signal input by the first sensor 55 .

In the assembly process of the transmission 10, the idle gears 18, 21, 24, 28, 31 are arranged on the first shaft 12, and the fixed gears 16, 19, 22, 25, 29, 32 are arranged on the second shaft 13. Sometimes, when the fixed gear 15 and the

idle gears

18, 21, 24, 28, 31 are meshed with the fixed gears 16, 19, 22, 25, 29, 32, the position of the first tooth 33 in the rotational direction is , and the positions of the marks 58 provided on the first shaft 12 in the rotational direction. Since the rotational positions of all the first teeth 33 are constant with respect to the fixed gear 16 arranged on the second shaft 13, the initial positions of all the first teeth 33 in the rotational direction are constant.

The first teeth 33 (the fixed gear 15 and the

idle gears

18, 21, 24, 28, 31) are connected to the fixed gear 15, the idle gears 18, 21, 24, 28, 31 and the fixed gears 16, 19, 22, 25. , 29 and 32 rotate in accordance with the gear ratio of the transmission gears meshing with each other. If there is one sensor for detecting the rotation of any one of the fixed gears 15, 19, 22, 25, 29, 32, the second shaft 13 can be used without arranging a sensor for detecting the rotation of the gears for each transmission gear. The CPU 61 can calculate the rotation angles of all the first teeth 33 from the integrated value of the rotation of and the gear ratio of each gear.

In this embodiment, rotation of the first tooth 33 is indirectly detected by the second sensor 56 that detects rotation of the fixed gear 16 . The control device 60 and the second sensor 56 detect that each gear is engaged with the fixed gear 15 and the

idle gears

18, 21, 24, 28, 31 and the fixed gears 16, 19, 22, 25, 29, 32 respectively. In addition to the main power supply as power supply means, a backup battery (not shown) is provided so that the integrated value of the rotation of the second shaft 13 can be stored from when it is arranged on the first shaft 12 and the second shaft 13 (initial position). are connected.

The CPU 61 sequentially processes the signals input by the second sensor 56 and causes the NVRAM 62 to store the rotation angle of the fixed gear 16 that increases from the initial position (0°). The first teeth 33 (the fixed gear 15 and the

idle gears

18, 21, 24, 28, 31) are connected to the fixed gear 15, the idle gears 18, 21, 24, 28, 31 and the fixed gears 16, 19, 22, 25. , 29 and 32 rotate according to the gear ratio of the transmission gears meshed with each other, the CPU 61 reads out the rotation angle of the fixed gear 16 stored in the NVRAM 62, and reads out the fixed gear 15 and

idle gears

18, 21, 24, 28, . The rotation angles θg of all the first teeth 33 can be calculated for each 31 . The CPU 61 causes the RAM to store the rotation angles θg of all the first teeth 33 . The rotation angle θg of the first tooth 33 increases from 0° to 45° and then returns to 0°.

The CPU 61 sequentially processes the signals input by the third sensor 57, calculates the rotation angle θh of the first tooth 33 of the idle gear 18 that increases from the initial position (0°), and stores it in the RAM. The rotation angle θh of the first tooth 33 increases from 0° to 45° and then returns to 0°.

With reference to FIGS. 3 and 4, the meshing process for switching gears and the correction process will be described. FIG. 3 is a flow chart of the meshing process, and FIG. 4 is a flow chart of the correction process. The meshing process is performed when changing gear stages of the transmission 10 . The correction process is always performed during operation of the vehicle in which the transmission 10 is installed.

As shown in FIG. 3, the control device 60 acquires the rotation angle θd of the second tooth 38 stored in the RAM (S1), and the CPU 61 (first calculation unit) acquires the rotation angle θd of the second tooth 38 when switching the gear stage. (S2). The CPU 61 calculates the difference Δθ1 between the rotation angle θd of the second tooth 38 and the rotation angle θg of the first tooth 33 (S3), and the moving member 37 starts moving in the axial direction when Δθ1 is larger than the threshold value. , the actuator 48 is driven so that the first tooth 33 and the second tooth 38 are meshed (S4: Yes). The threshold value indicates the drive timing at which the second tooth 38 can mesh with the first tooth 33 without colliding with it, and is determined by performing simulations or tests in advance.

As shown in FIG. 4, in the control device 60, the CPU 61 (third computing unit) acquires the rotation angle θh of the first tooth 33 (idling gear 18) stored in the RAM while the automobile is operating. (S5), the CPU 61 (second calculation unit) acquires the rotation angle θg of the first tooth 33 (idling gear 18) calculated based on the data (integrated value of rotation) stored in the NVRAM 62 (S6). . The CPU 61 (comparison unit) calculates the difference Δθ2 between the rotation angle θg and the rotation angle θh (S7). When the rotation speed of the first axis 12 is smaller than the threshold value 2 (S8: Yes), the rotation angle data stored in the NVRAM 62 is rewritten by the rotation angle corresponding to Δθ2 (S9).

The threshold value 1 indicates that the difference between the calculated value θg based on the rotation angle stored in the NVRAM 62 and the rotation angle θh obtained by the third sensor 57 for verification cannot be ignored. to determine. Since the CPU 61 (comparator) obtains the difference Δθ2 between the rotation angle θg and the rotation angle θh, the functions of the control device 60, sensors, etc. can be verified.

Threshold 2 indicates that the vehicle is traveling at a low speed, and is determined by conducting simulations or tests in advance and taking into account the sensor's judgment error. When the NVRAM 62 is continuously rewritten a certain number of times or more (for example, the second time or more) (S10: No), the CPU 61 activates the alarm device 59 (S11) to inform the operator that an abnormality has occurred. do. The deviation between the measured value .theta.h of the first tooth 33 and the calculated value .theta.g may be caused by an abnormality in the sensor, the CPU 61, or the like. If the NVRAM 62 is continuously rewritten (continuously deviated), it is not an erroneous determination, and there is a high possibility that the transmission 10 needs to be repaired. Since this can be notified to the operator, damage to the transmission 10 can be prevented.

By providing a spare battery, the NVRAM 62 to which the spare battery is connected, even in a state where the main power supply is lost, can be used when the gears are arranged on the first shaft 12 and the second shaft 13 with the gears meshing with each other. A value obtained by integrating the detection of the second sensor 56 from . Therefore, even when the first shaft 12 is forcibly rotated via the output gear 14, such as when the vehicle is towed by a wrecker with the front or rear wheels of the vehicle equipped with the transmission 10 lifted, the data in the NVRAM 62 will be retained. can be rewritten. The CPU 61 (second calculation unit) acquires the rotation angle θg of the first tooth 33 based on the value stored in the NVRAM 62 . Therefore, the calculation accuracy of the rotation angle θg of the first tooth 33 can be improved.

When the difference between the rotation angle θg calculated based on the rotation angle stored in the NVRAM 62 and the rotation angle θh obtained by the third sensor 57 cannot be ignored, the controller 60 calculates the difference between the rotation angle θg and the rotation angle θh. Since the data stored in the NVRAM 62 is rewritten by the rotation angle corresponding to Δθ2, the calculation accuracy of the rotation angle θg of the first tooth 33 can be further improved.

Since the controller 60 modifies the data in the NVRAM 62 when the automobile is running at a low speed (the rotation speed of the first tooth 33 is small), the position of the first tooth 33 in the rotational direction generated at the time when the data in the NVRAM 62 is rewritten. It is possible to reduce the deviation. Therefore, it is possible to reduce errors that occur when modifying data in the NVRAM 62 .

Even if the data in the NVRAM 62 is corrected, the controller 60 activates the alarm device 59 when there is a difference Δθ2 between the rotation angle θg and the rotation angle θh. can.

Although the present invention has been described above based on the embodiments, the present invention is by no means limited to these embodiments, and various improvements and modifications can easily be made without departing from the scope of the present invention. can be inferred. For example, the number of gear stages of the transmission 10, the arrangement of transmission gears, the number of idle gears arranged on the first shaft 12, the number, size and shape of the first teeth 33 and the second teeth 38, etc. are appropriately set. can.

In the embodiment, the case where the transmission 10 is mounted on an automobile has been described, but it is not limited to this, and it is of course possible to mount the transmission 10 on construction machinery, industrial vehicles, agricultural machinery, and the like.

In the embodiment, the case where the mark 58 made up of gears is provided on the first shaft 12 and the first sensor 55 detects the mark 58 has been described, but the present invention is not necessarily limited to this. Marks are not limited to gears. Any mark may be used as long as it rotates integrally with the first shaft 12 . Examples of the mark include protrusions and recesses provided on the first shaft 12, the moving member 37, and the hub 34, and magnets arranged on a part of the circumference of the first shaft 12, the moving member 37, and the hub 34, and the like. It is of course possible for the first sensor 55 to detect the second tooth 38 provided on the moving member 37 as a mark.

In the embodiment, the fixed gear 16 meshing with the fixed gear 15 provided on the drive shaft 11 is arranged on the second shaft 13, and the second sensor 56 detects the rotation of the fixed gear 16 to detect the rotation of the second shaft 13. The case of detection has been described. The detection target of the second sensor 56 is not limited to this. It is of course possible to provide a mark that rotates integrally with the second shaft 13 on the second shaft 13 and use the mark as another detection target of the second sensor 56 . Other objects to be detected by the second sensor 56 are the fixed gear 15 meshing with the fixed gear 16 , the idle gears 18 , 21 , 24 , 28 and 31 arranged on the first shaft 12 , and arranged on the second shaft 13 . fixed gears 19, 22, 25, 29, 32. This is because they regularly rotate as the fixed gear 15 rotates.

In the embodiment, the case of connecting a spare battery to the control device 60 and the second sensor 56 has been described, but it is not necessarily limited to this. If the second sensor 56 that detects rotation and generates power is employed, a spare battery can be omitted. Such a second sensor 56 is, for example, a magnetic element in which a coil is arranged around a conducting wire (Wiegand wire) having different magnetic permeability at the center and outside. This magnetic element generates an electric pulse (electricity) while detecting rotation. Thereby, a spare battery connected to the control device 60 and the second sensor 56 can be omitted.

In the embodiment, the case where the third sensor 57 that detects the rotation of the idle gear 18 arranged on the first shaft 12 is arranged has been described. The detection target of the third sensor 57 is not limited to this. Another detection target of the third sensor 57 is a gear in a different gear stage than the gear whose rotation is detected by the second sensor 56 or the second shaft 13 . A detection target of the third sensor 57 is, for example, any of the

idle gears

21, 24, 28 and 31 and any of the fixed gears 19, 22, 25, 29 and 32.

In the embodiment, the third sensor 57 detects the rotation of the idle gear 18, and the CPU 61 (comparator) calculates the rotation angle of the first tooth 33 (idler gear 18) based on the data stored in the NVRAM 62. Although the case of calculating the difference Δθ2 between θg and the rotation angle θh has been described, the present invention is not limited to this. When the third sensor 57 detects rotation of any one of the fixed gears 19, 22, 25, 29 and 32, the CPU 61 (comparator) calculates the fixed

gear

19, 25, 32 based on the data stored in the NVRAM 62. The rotation angle of any of 22, 25, 29, 32 and the rotation angle of any of fixed

gears

19, 22, 25, 29, 32 detected by the third sensor 57 are compared.

In the embodiment, a fixed gear 16 meshing with a fixed gear 15 arranged on the drive shaft 11 is arranged on the second shaft 13, and the fixed gears 19, 22, 25, 29, 32 arranged on the second shaft 13 and the first Although the idle gears 18 , 21 , 24 , 28 , 31 arranged on the shaft 12 are meshed with each other and the output gear 14 is arranged on the first shaft 12 , this is not necessarily the case. For example, it is naturally possible to arrange

idle gears

18 , 21 , 24 , 28 , 31 on the second shaft 13 and arrange fixed

gears

19 , 22 , 25 , 29 , 32 on the first shaft 12 . It is of course possible to omit the fixed gears 15 and 16, connect the drive shaft 11 to the first shaft 12, and dispose the output gear 14 on the second shaft 13. FIG.

In the embodiment, the case of correcting the data in the NVRAM 62 in the correction process (see FIG. 4) has been described, but it is not necessarily limited to this. If the difference Δθ2 between the rotation angle θg and the rotation angle θh is greater than the threshold 1 (S7: Yes), the processing of S8-S10 can be omitted and the alarm device 59 can be activated by executing the processing of S11. Of course it is possible.

10 transmission 12 first shaft 13

second shaft

18, 21, 24, 28, 31

idle gears

19, 22, 25, 29, 32 fixed gear 33 first tooth 37 moving member 38 second tooth 55 first sensor 56 Second sensor 57 Third sensor 58 Mark 60 Control device 62 NVRAM (memory)

Claims

a first axis and a second axis arranged parallel to each other;
a plurality of idler gears arranged to be relatively rotatable and immovable in the axial direction on the first shaft and provided with first teeth;
a plurality of moving members provided with second teeth that are arranged so as to be non-rotatable relative to the first shaft and movable in the axial direction and that mesh with the first teeth;
a fixed gear that is arranged on the second shaft so as not to be relatively rotatable and meshes with the idle gear;
a sensor that directly or indirectly detects the rotation of the first tooth and the second tooth;
a control device that acquires the positions of the first tooth and the second tooth in the rotational direction based on the detection of the sensor and starts moving the moving member in the axial direction;
the first axis includes a mark that rotates integrally with the first axis;
A transmission wherein the rotational position of said second tooth is in a fixed relationship to the rotational position of said mark.
The position of the first tooth in the rotation direction when the idle gear is arranged on the first shaft and the fixed gear is arranged on the second shaft in a state where the idle gear and the fixed gear are in mesh with each other 2. A transmission according to claim 1, wherein said second shaft has a constant relationship with respect to the rotational position of said second shaft.
the sensor includes a second sensor that detects rotation of the second shaft, the idle gear, or the fixed gear;
The control device controls the second sensor from when the idle gear is arranged on the first shaft and the fixed gear is arranged on the second shaft in a state where the idle gear and the fixed gear are in mesh with each other. a memory for storing the integrated value of the detection of
3. The transmission according to claim 2, further comprising a second calculation section that acquires the rotational position of the first tooth based on the value stored in the memory.
The sensor includes a third sensor that detects the rotation of the second shaft or a gear in a gear different from the gear whose rotation is detected by the second sensor,
The control device includes a third computing unit that acquires a rotational direction position of the gear or the second shaft based on detection by the third sensor;
A comparison for comparing the position in the rotational direction of the gear or the second shaft acquired by the third computing unit and the position in the rotational direction of the gear or the second shaft acquired based on the value stored in the memory 4. The transmission of claim 3, comprising: