JP6088473B2 - Automatic transmission and abnormality detection device for automatic transmission - Google Patents

Description

  The present invention relates to an automatic transmission and an abnormality detection device thereof, more specifically, an automatic transmission having a hollow rotating shaft in which an oil passage for supplying hydraulic oil is formed in the shaft, and an abnormality in the rotating shaft. The present invention relates to an apparatus for detecting occurrence.

  Conventionally, for example, a technique described in Patent Document 1 is known as an automatic transmission including a hollow rotary shaft in which an oil passage for supplying hydraulic oil is formed in a shaft.

  In the technique described in Patent Document 1, the outer periphery of one end side of the rotating shaft at the connecting portion between the rotating shaft in which the oil passage is formed and the transmission case (more precisely, the supply pipe provided in the transmission case) When a shaft shift occurs between the oil passage of the rotating shaft and the hydraulic oil supply pipe by inserting a coiled spring between the rod and the transmission case. Even if it exists, it is trying to prevent that an excessive bending stress arises in a supply pipe and a supply pipe moves to an axial direction.

  Moreover, as a prior art regarding the apparatus which detects that abnormality has occurred in the rotating shaft of the automatic transmission, for example, a technique described in Patent Document 2 can be cited.

  In the technique described in Patent Document 2, a hole is formed in the race portion of the bearing, a non-contact type gap sensor or the like is embedded, and abnormality of the bearing is determined based on the gap amount between the ball surface of the bearing and the sensor. I have to.

Japanese Utility Model Publication No. 04-051246 JP 2009-074982 A

  In the technique described in Patent Literature 1, excessive bending stress is not generated in the supply pipe provided in the transmission case, and the supply pipe can be prevented from moving in the axial direction. On the other hand, there is a possibility that bending stress may occur on the end side of the rotating shaft provided with the flange. In addition, even after the shaft center shift occurs, the hydraulic oil is supplied in the same manner as before the shift occurs, so that there is a high possibility that the member such as the rotating shaft is worn or deteriorated.

  Further, it is possible to determine abnormality of the rotating shaft (more precisely, its bearing) by the technique described in Patent Document 2. However, in the technique described in Patent Document 2, since it is necessary to embed a sensor by providing a hole in each bearing in order to determine an abnormality of the bearing, the structure becomes complicated and the weight and cost of the apparatus may increase. .

  Accordingly, the object of the present invention is to eliminate the above-mentioned disadvantages, and a deviation occurs in the shaft center between the hollow rotary shaft in which the oil passage is formed in the axial direction and the supply pipe that supplies the hydraulic oil to the oil passage. Even in such a case, an automatic transmission that can appropriately protect the rotating shaft and the supply pipe can be provided, and an abnormality of the rotating shaft can be accurately determined with a simple configuration without causing an increase in weight or cost. An object of the present invention is to provide an abnormality detection device for an automatic transmission.

  In order to solve the above-described problem, in claim 1, a hollow rotating shaft that is rotatably supported in the transmission case and has an oil passage extending in the axial direction, and the transmission case. A hydraulic oil supply pipe for supplying hydraulic oil to the oil passage of the rotary shaft, and a hydraulic working chamber provided on the rotary shaft and supplied with the hydraulic oil via the oil passage of the rotary shaft In the transmission, the hydraulic oil supply pipe is sealed when the axial center of the hydraulic oil supply pipe and the axial center of the rotary shaft coincide with each other, while the axial center of the hydraulic oil supply pipe and the axial center of the hydraulic oil supply pipe The transmission case is configured to have a leak oil hole for leaking the hydraulic oil when the axis of the rotary shaft does not coincide with the center.

  In the automatic transmission according to claim 2, the hydraulic oil supply pipe has spherical portions at both ends in the axial direction, and one of the spherical portions is swung by a spherical concave portion provided in the transmission case. The other of the spherical parts is held in a freely swingable manner in the oil passage of the rotating shaft and has a hydraulic oil supply oil hole for supplying the hydraulic oil to the oil passage, and a leak oil hole. It was configured as provided.

  In the automatic transmission according to claim 3, the hydraulic oil supply pipe is slidable along a wall surface of the transmission case, and is connected to a connection portion between the hydraulic oil supply pipe and the transmission case. The leak oil hole is provided.

  In the automatic transmission according to a fourth aspect, the automatic transmission is constituted by a continuously variable transmission including a pulley, and the hydraulic operation chamber is a piston chamber of the pulley.

  According to claim 5, when it is determined that the hydraulic oil is leaking from the leak oil hole based on the hydraulic pressure detection means capable of detecting the hydraulic pressure in the hydraulic pressure working chamber, and based on the detected hydraulic pressure, An abnormality determining means for determining that an abnormality has occurred in the automatic transmission is provided.

  According to the first aspect of the present invention, there is provided a hollow rotary shaft that is rotatably supported in the transmission case and has an axially extending oil passage, and an operation that supplies hydraulic oil from the transmission case to the oil passage. In an automatic transmission including an oil supply pipe, the hydraulic oil supply pipe is sealed when the rotation shaft and the shaft center coincide with each other, and when the shaft center does not coincide with the hydraulic oil, the hydraulic oil is contained in the transmission case. It was configured to include a leak oil hole that leaks water. Therefore, even when an abnormality occurs in the automatic transmission and the shaft center of the rotating shaft is shifted, the load on the rotating shaft and the hydraulic oil supply pipe can be reduced to protect the automatic transmission.

  In the automatic transmission according to claim 2, the hydraulic oil supply pipe has spherical portions at both ends in the axial direction, and one of the spherical portions is swingably held by a spherical recess provided in the transmission case. The other of the spheres is configured to be provided with a hydraulic oil supply oil hole and a leak oil hole that are swingably held in the oil path of the rotating shaft and supply the hydraulic oil to the oil path. In addition to the above effects, when an abnormality occurs in the automatic transmission and the shaft center of the rotating shaft shifts, the load on the rotating shaft and the hydraulic oil supply pipe is reduced to protect the automatic transmission more appropriately. Can do.

  That is, since the hydraulic oil supply pipe has spheres at both ends and is configured to be swingable, even if an abnormality occurs in the automatic transmission and the axis of the rotating shaft is displaced, Since the shift can be accurately followed, the load on the rotating shaft and the hydraulic oil supply pipe can be reduced.

  In the automatic transmission according to claim 3, the hydraulic oil supply pipe is slidable along the wall surface of the transmission case, and the leak oil hole is formed in a connection portion between the hydraulic oil supply pipe and the transmission case. In addition to the effects described above, when an abnormality occurs in the automatic transmission and the shaft center of the rotating shaft shifts, the load on the rotating shaft and the hydraulic oil supply pipe is reduced to reduce the automatic shifting. The machine can be more appropriately protected.

  Further, since the hydraulic oil supply pipe can move (slide) along the wall surface of the transmission case, the hydraulic oil supply pipe can be easily assembled.

  In the automatic transmission according to claim 4, since the automatic transmission is composed of a continuously variable transmission including a pulley and the hydraulic operation chamber is a piston chamber of the pulley, in addition to the effects described above, Even when an abnormality occurs in an oil passage to which a relatively high-pressure hydraulic oil is supplied, the load on the rotary shaft and the hydraulic oil supply pipe can be reduced, and the automatic transmission can be more appropriately protected. . In particular, since the piston chamber of the pulley has a large capacity and plays a very important role in the control of the automatic transmission, the oil transmission connected to the pulley piston chamber is configured as described above, so that the automatic transmission Can be more appropriately protected.

  In the automatic transmission abnormality detection device according to claim 5, the hydraulic pressure detection means capable of detecting the hydraulic pressure in the hydraulic pressure working chamber, and the hydraulic oil leaking from the leak oil hole based on the detected hydraulic pressure In addition to the effects described above, an abnormality of the rotating shaft is accurately determined with a simple configuration in addition to the above-described effect. be able to.

1 is a schematic view showing an entire automatic transmission according to a first embodiment of the present invention. It is a conceptual diagram for demonstrating the specific structure of the rotating shaft vicinity shown in FIG. 2 is a conceptual diagram for explaining a specific structure in the vicinity of the rotation axis shown in FIG. It is a conceptual diagram for demonstrating the specific structure of the rotating shaft vicinity of the automatic transmission which concerns on 2nd Embodiment of this invention. It is the schematic which shows entirely the abnormality detection apparatus of the automatic transmission which concerns on 3rd Embodiment of this invention. 5 is a flowchart showing processing of the abnormality detection device for an automatic transmission shown in FIG. 4. 5 is an explanatory diagram for explaining the abnormality determination processing in the flow chart.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments for carrying out a transmission and an abnormality detecting / fixing device according to the present invention will be described below with reference to the accompanying drawings.

First embodiment

  FIG. 1 is a schematic view generally showing an automatic transmission according to a first embodiment of the present invention.

  In FIG. 1, reference numeral 10 denotes an automatic transmission (hereinafter simply referred to as “transmission”). The transmission 10 is mounted on a vehicle (not shown) and shifts the output of a drive source, more specifically, an internal combustion engine (hereinafter referred to as “engine”; not shown in FIG. 1) to drive left and right drive wheels (see FIG. (Not shown).

  As shown in the figure, the transmission 10 includes an input shaft (rotary shaft) 12, a DR (drive) pulley shaft (rotary shaft) 14, a DN (driven) pulley shaft (rotary shaft) 16, and an idle shaft 18 provided in parallel with each other. The output of the engine is input from the input shaft 12 via the torque converter 20 having the lock-up clutch 20a.

  A continuously variable transmission mechanism (hereinafter referred to as “CVT mechanism”) 26 is provided between the DR pulley shaft 14 and the DN pulley shaft 16.

  The CVT mechanism 26 includes a DR pulley 30 disposed on the DR pulley shaft 14, a DN pulley 32 disposed on the DN pulley shaft 16, and an endless flexible member (for example, a metal V belt) ) 34.

  The DR pulley 30 is fixed to the DR pulley shaft 14 so as not to rotate relative to the DR pulley shaft 14 and cannot move in the axial direction. The DR pulley 30 cannot move relative to the DR pulley shaft 14 and axially relative to the fixed DR pulley half 30a. The movable DR pulley half 30b is movably provided.

  The DN pulley 32 is fixed to the DN pulley shaft 16 so as not to rotate relative to the DN pulley shaft 16 and cannot move in the axial direction. The DN pulley 32 cannot move relative to the DN pulley shaft 16 and axially relative to the stationary DN pulley half 32a. The movable DN pulley half 32b is provided so as to be movable.

  The movable DR pulley half 30b and the movable DN pulley half 32b are provided with piston chambers (hydraulic working chambers) 30b1 and 32b1, and the movable DR and DN pulley halves 30b and 32b are supplied to the piston chambers 30b1 and 32b1. The fixed DR and DN pulley halves 30a and 32a approach or separate from each other according to the oil pressure (side pressure).

  A forward / reverse switching mechanism 36 that switches the traveling direction of the vehicle is provided on the input shaft 12. The forward / reverse switching mechanism 36 includes a forward (FWD) travel gear 38 and a forward (FWD) clutch 40, and a reverse (RVS) travel gear 42 and a reverse (RVS) clutch 44.

  The engine output input from the input shaft 12 via the torque converter 20 is transmitted to the DR pulley shaft 14 via the forward travel gear 38 or the reverse travel gear 42, and the DR pulley shaft 14 is moved forward or backward in the vehicle. Rotate.

  A differential mechanism 46 is connected to the DN pulley shaft 16. The left and right axles 48 are fixed to the differential mechanism 46, and driving wheels (not shown) are attached to the ends thereof.

  In the CVT mechanism 26, the pulley side pressure of both the DR pulley 30 and the DN pulley 32 is increased / decreased to change the pulley width, and the winding radius of the endless flexible member 34 to both the pulleys 30, 32 is changed to perform winding. A desired gear ratio (ratio) corresponding to the ratio of the multiplying radii (pulley ratio) can be obtained steplessly.

  The amount of engagement of the lock-up clutch 20a of the torque converter 20 described above, the pulley width of the DR pulley 30, etc., the engagement (in-gear) / non-engagement (release.out-gear) of the forward clutch 40 or the reverse clutch 44, etc. This is done by controlling the hydraulic pressure supplied to the back pressure chamber, the piston chamber, etc., but detailed description thereof will be omitted.

  As illustrated, the transmission 10 is housed in a case 50. More specifically, the case 50 includes a transmission case (transmission case) 52 that houses a main body portion such as the transmission 10 and a torque converter case 54 that houses the torque converter 20 and the like.

  Further, a hydraulic pump 60 driven by the engine is provided inside the transmission case 52, and the hydraulic oil pumped from the reservoir is pumped to the piston chambers 30b1 and 32b1 of the DR and DN pulleys 30 and 32.

  Specifically, the DR and DN pulley shafts 14 and 16 have a hollow shape, and the oil passages 14a and 16a communicate with the piston chambers 30b1 and 32b1 in the axial direction inside the DR and DN pulley shafts 14 and 16, respectively. And an oil passage 52a is also formed in the wall of the transmission case 52, and the hydraulic oil pumped up from the reservoir by the hydraulic pump 60 is the oil passage 52a of the transmission case 52 and the DR and DN pulley shafts. 14 and 16 are fed (supplied) to the piston chambers 30b1 and 32b1 of the DR and DN pulleys 30 and 32 through the oil passages 14a and 16a.

  The hydraulic pump 60 pressure-feeds hydraulic oil to a hydraulic control valve (not shown), forward and piston chambers of the reverse clutches 40 and 44, and the like.

  Next, the structure near the rotating shaft according to the first embodiment will be described in detail with reference to FIGS. 2 and 3 are conceptual diagrams for explaining a specific structure in the vicinity of a connection portion between the DN pulley shaft 16 and the transmission case 52 according to the first embodiment. 2 and 3, some structures are partially exaggerated for convenience of understanding. Accordingly, the dimensions and the like of each element are limited to those shown in FIGS. It is not something.

  As shown in FIG. 2, in the first embodiment, between the oil passage 52 a formed in the wall of the transmission case 52 and the oil passage 16 a extending in the axial direction in the shaft of the DN pulley shaft 16, A hollow pipe-shaped feed pipe (operating oil supply pipe) 70 is disposed concentrically with the DN pulley shaft 16.

  The feed pipe 70 has a tip portion (sphere portion) 70a and a root portion (sphere portion) 70b each having a spherical shape on both ends in the axial direction. The feed pipe tip 70a and the oil passage 16a of the DN pulley shaft 16 are connected by a cap 72. More specifically, the cap 72 and the oil passage 16a are liquid-tightly sealed by an O-ring 73, and the cap The space between the inner side of 72 and the outer peripheral surface of the feed pipe tip 70a is also sealed in a liquid-tight manner. The cap 72 is provided with a through hole 72a that is concentric with the oil passage 16a. The feed pipe tip 70 a is held so as to be swingable with respect to the cap 72.

  An open oil hole 70a1 is provided in the feed pipe distal end portion 70a. The open oil hole 70a1 is connected to the oil passage 16a and is supplied from the hydraulic pump 60 to the piston chamber 32b1 of the DN pulley 32. Concentric. A plurality of leak oil holes 70a2 (described later) are formed in the outer peripheral surface of the feed pipe tip 70a in a direction perpendicular to the axial direction of the feed pipe 70.

  On the other hand, the feed pipe root portion 70b and the transmission case 52 are swingably held by a spherical concave portion provided on the wall surface of the transmission case 52. The feed pipe root portion 70b includes a transmission case 52 wall. A plurality of hydraulic oil supply oil holes 70b1 communicating with the oil passage 52a formed therein are formed in the same direction as the oil passage 52a (a direction orthogonal to the axial direction of the feed pipe 70).

  Further, a leak oil passage 74 is formed in the cap 72. More specifically, the leak oil passage 74 includes an annular groove 74a formed along the inner peripheral surface of the cap 72, and a communication passage 74b that communicates with the annular groove 74a and passes through the wall surface of the cap 72. The leading end of the communication path 74 b is opened inside the transmission case 52.

  The leak oil hole 70a2 provided on the outer peripheral surface of the feed pipe front end portion 70a has a semicircular shape, and is formed so that straight portions connecting both ends of the semicircular shape are aligned in a direction perpendicular to the axial direction of the feed pipe 70. . That is, in the state shown in FIG. 2, the annular groove 74a of the leak oil passage 74 and the straight portion of the leak oil hole 70a2 are arranged in parallel at positions close to each other. However, in such a state, the annular groove 74a and the leak oil hole 70a2 do not communicate with each other, and therefore the leak oil hole 70a2 is sealed in a liquid-tight manner by the inside of the cap 72.

  Here, some abnormality occurs in the DN pulley shaft 16 (for example, peeling of the ball surface of a bearing (not shown) that rotatably supports the DN pulley shaft 16 on the transmission case 52 or wear of the race portion). As a result, when the shaft center of the DN pulley shaft 16 and the feed pipe 70 is displaced, the DN pulley shaft 16, the feed pipe 70, and the transmission case 52 are displaced in a positional relationship as illustrated in FIG.

  As a result, the leak oil hole 70a2 of the feed pipe tip 70a and the annular groove 74a of the leak oil path 74 communicate with each other, so that the oil is pumped by the hydraulic pump 60 and the oil path 52a of the transmission case 52, the feed pipe 70, and the DN pulley. Part of the hydraulic fluid to be supplied to the piston chamber 32b1 of the DN pulley 32 via the oil passage 16a of the shaft 16 leaks into the transmission case 52 from the leak oil hole 70a1 via the leak oil passage 74. It becomes.

  That is, when any abnormality occurs in the DN pulley shaft 16, the hydraulic pressure of the hydraulic oil passing through the feed pipe 70 and the oil passage 16a can be reduced, and the load on the DN pulley shaft 16 and the feed pipe 70 can be reduced. It is possible to protect the transmission 10.

  In the first embodiment, the vicinity of the DN pulley shaft 16 is shown and described as the rotation shaft. However, the present invention is merely an example, and the invention according to the first embodiment includes the forward clutch 40 and the reverse clutch in addition to the DR pulley shaft 14. The present invention can also be applied in the vicinity of the input shaft 12 that supports 44. That is, in the case of the DR pulley shaft 14, in the oil passage for supplying the hydraulic oil to the piston chamber 30b1 of the DR pulley 30, in the case of the input shaft 12, the hydraulic oil is supplied to the piston chamber (not shown) of the clutch. It is possible to apply the structure of the invention according to the first embodiment in the oil passage for supplying the oil.

  As described above, in the first embodiment of the present invention, a hollow rotary shaft (for example, DN) that is rotatably supported in the transmission case 52 and has an oil passage 16a extending in the axial direction is formed. Pulley shaft 16), a hydraulic oil supply pipe (feed pipe) 70 for supplying hydraulic oil from the transmission case 52 to the oil passage 16a of the DN pulley shaft 16, and the DN pulley shaft 16 and the DN. In the automatic transmission 10 including a hydraulic working chamber (piston chamber 32b1) to which the working oil is supplied through an oil passage 16a of the pulley shaft 16, the feed pipe 70 is connected to the shaft center of the feed pipe 70 and the When the shaft center of the DN pulley shaft 16 coincides with the shaft center, the shaft center of the feed pipe 70 and the shaft center of the DN pulley shaft do not coincide with each other. The operating oil in the transmission case 52 is configured to include a leakage oil bore 70a2 to leak. Accordingly, an abnormality occurs in the automatic transmission 10 (for example, a ball surface peeling of a bearing (not shown) that rotatably supports the DN pulley shaft 16 on the transmission case 52 or wear of the race portion) occurs, and the DN pulley shaft Even when the center of the 16 shaft is displaced, the load on the DN pulley shaft 16 and the feed pipe 70 can be reduced to protect the automatic transmission 10.

  The feed pipe 70 has spherical portions (feed pipe tip portion 70a, feed pipe root portion 70b) at both axial ends, and one of the spherical body portions (feed pipe root portion 70b) is formed in the transmission case 52. The other spherical portion (feed pipe tip portion 70a) is swingably held in the oil passage 16a of the DN pulley shaft 16 and the hydraulic oil is held by the spherical recess provided in the shaft. Since the hydraulic oil supply oil hole (open oil hole) 70a1 supplied to the oil passage 16a and the leak oil hole 70a2 are provided, in addition to the above effects, an abnormality occurs in the automatic transmission 10. When the shaft center of the DN pulley shaft 16 is deviated, the load on the DN pulley shaft 16 and the feed pipe 70 is reduced to protect the automatic transmission 10 more appropriately. It is possible.

  That is, since the feed pipe 70 has spherical portions (feed pipe tip portion 70a, feed pipe root portion 70b) at both ends and is configured to be swingable, an abnormality occurs in the automatic transmission 10 and DN is generated. Even when the shaft center of the pulley shaft 16 is deviated, it is possible to accurately follow the deviation (the position can be changed according to the deviation). The load applied to 70 can be reduced.

  In addition, the automatic transmission 10 is composed of a continuously variable transmission including a pulley, and the hydraulic operation chamber is configured as the piston chamber 32b1 of the pulley (DN pulley 32). Even when an abnormality occurs in the oil passage 16a to which the hydraulic oil of high pressure is supplied, the load on the DN pulley shaft 16 and the feed pipe 70 is reduced, and the automatic transmission 10 is more appropriately protected. Can do. In particular, since the piston chamber 32b1 of the DN pulley 32 has a large capacity and plays a very important role in the control of the automatic transmission 10, the oil passage 16a connected to the DN pulley piston chamber 32b1 is configured as described above. By doing so, the automatic transmission 10 can be more appropriately protected.

Second embodiment

  Next, an automatic transmission 10 according to a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a schematic diagram for explaining a specific structure in the vicinity of the DN pulley shaft 16 of the automatic transmission 10 according to the second embodiment.

  As shown in the figure, in the second embodiment of the present invention, between the transmission case 52 and the DN pulley shaft 16, one end of the hollow tube, specifically, the feed pipe root portion 70b 'is formed from the flange. A feed pipe 70 'is provided.

  As in the first embodiment, the feed pipe tip 70a 'has a spherical shape, and the feed pipe tip 70a' and the oil passage 16a of the DN pulley shaft 16 are connected by a cap 72 '. More specifically, the cap 72 ′ and the oil passage 16a are liquid-tightly sealed by the O-ring 73, and the space between the inside of the cap 72 ′ and the outer peripheral surface of the feed pipe tip 70a ′ is also liquid-tight. The Further, the cap 72 'is formed with a through hole 72a concentric with the oil passage 16a, and the feed pipe distal end portion 70a' is held swingably with respect to the cap 72 '.

  However, unlike the first embodiment, the cap 72 ′ does not have a leak oil passage, and no leak oil hole is provided in the feed pipe tip 70 a ′.

  On the other hand, the feed pipe root portion (flange portion) 70 b ′ is accommodated in an oil passage 52 a formed in the transmission case 52 and held by the holder 100. An appropriate gap 102 is provided between the holder 100 and the feed pipe root portion 70 b ′ so that the feed pipe root portion 70 b ′ can slide along the wall surface of the transmission case 52.

  Further, a leak oil hole 70b2 is formed in a connection portion between the feed pipe root portion 70b 'and the transmission case 52. Specifically, as shown well in FIG. 4, a plurality of leak oil holes 70b2 are formed in the feed pipe root portion 70b ′ and the wall surface of the transmission case 52 (more precisely, the transmission case 52 Among these wall surfaces, a leak oil passage 74b 'is bored inside a leak oil hole 70b2 provided in the feed pipe root portion 70b' on the wall surface on the side in contact with the feed pipe root portion 70b '.

  As shown in FIG. 4, when the DN pulley shaft 16 and the shaft of the feed pipe 70 ′ are concentric, the leak oil hole 70b2 provided in the base portion 70b ′ of the feed pipe is connected to the wall surface of the transmission case 52. It is sealed in a liquid-tight manner.

  On the other hand, if any abnormality occurs in the DN pulley shaft 16 and the shaft center of the DN pulley shaft 16 and the feed pipe 70 ′ is displaced as a result, the feed pipe root portion 70 b ′ slides on the wall surface of the transmission case 52. Therefore, a part of the hydraulic oil that is pumped by the hydraulic pump 60 and supplied to the oil passage 52a leaks into the transmission case 52 through the leak oil hole 70b2 and the leak oil passage 74b ′. .

  Therefore, as in the case of the first embodiment, if any abnormality occurs in the DN pulley shaft 16, the hydraulic pressure of the hydraulic oil passing through the feed pipe 70 'and the oil passage 16a can be reduced, and the DN pulley shaft 16 and the feed It is possible to protect the transmission 10 by reducing the load applied to the pipe 70 ′ and the like.

  The remaining configuration and effects are the same as in the first embodiment. Further, in the example shown in FIG. 4, regarding the positional relationship between the leak oil hole 70b2 drilled in the feed pipe 70 ′ and the leak oil passage 74b ′ drilled in the wall surface of the transmission case 52, the feed pipe 70 ′. The leak oil passage 74b ′ of the transmission case 52 is provided inside the leak oil hole 70b2, but the positional relationship between the leak oil hole 70b2 and the leak oil passage 74b ′ is not limited to this, Needless to say, the inside and outside may be reversed.

  As described above, in the second embodiment of the present invention, the feed pipe 70 ′ is slidable along the wall surface of the transmission case 52, and the feed pipe 70 ′ and the speed change. Since the leak oil hole 70b2 is provided in the connection portion of the machine case 52, when an abnormality occurs in the automatic transmission 10 and the shaft center of the rotating shaft (for example, the DN pulley shaft 16) is shifted, the DN The load applied to the pulley shaft 16 and the feed pipe 70 'can be reduced to protect the automatic transmission 10 more appropriately.

  In addition, the feed pipe 70 ′ is configured to be movable (slidable) along the wall surface of the transmission case 52 (more specifically, the feed pipe base portion 70b is not a spherical shape as in the first embodiment). Therefore, the feed pipe 70 'can be easily assembled.

Third embodiment

  Next, an abnormality detection apparatus for an automatic transmission according to a third embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a schematic diagram showing the entire abnormality detection device for an automatic transmission according to the first embodiment. In addition, as a specific structure of the rotating shaft (DR, DN pulley shafts 14, 16, etc.) in the automatic transmission 10 according to the third embodiment, the structure of either the first embodiment or the second embodiment described above is adopted. It shall be.

  As shown in FIG. 5, the abnormality detection device for an automatic transmission according to the third embodiment of the present invention includes a hydraulic pressure supply mechanism 80 and is driven by an engine (shown as “ENG” in FIG. 5). 5), and the hydraulic pressure obtained by adjusting the pressure of the hydraulic oil discharged by the hydraulic pump 60 by appropriately controlling various control valves and electromagnetic valves arranged in the oil passage. Are supplied to the lockup clutch 20a, the forward / reverse switching mechanism 36, the piston chambers of the reverse clutches 40 and 44, the DR of the CVT mechanism 26, the piston chambers 30b1 and 32b1 of the DN pulleys 30 and 32, and the like.

An N _DR sensor (rotational speed sensor) 82 is provided at an appropriate position in the vicinity of the DR pulley 30 and outputs a pulse signal indicating the rotational speed N _DR of the DR pulley 32, in other words, the rotational speed of the DR pulley shaft 14. Further, an N _DN sensor (rotational speed sensor) 84 is provided at an appropriate position in the vicinity of the DN pulley 32, and outputs a pulse signal indicating the rotational speed N _DN of the DN pulley 32, in other words, the rotational speed of the DN pulley shaft 16. To do.

  Further, a vehicle speed sensor (rotational speed sensor) 86 is provided at an appropriate position near the output shaft 48 to output a pulse signal indicating the rotational speed and rotational direction of the output shaft, in other words, the vehicle speed V and the traveling direction of the vehicle. .

A _DN sensor (hydraulic sensor) 88 is disposed in the oil passage of the hydraulic pressure supply mechanism 80 and supplied to the DN pulley 32 (more specifically, supplied to the piston chamber 32b1 of the DN pulley 32). A signal corresponding to P _DN is output.

The output from the above-described _NDR sensor 82 is sent to a shift controller 90 having a microcomputer comprising a CPU, ROM, RAM, I / O and the like. The shift controller 90 corresponds to the abnormality detection device for the automatic transmission according to the third embodiment.

The shift controller 90 controls the forward / reverse switching mechanism 36, the CVT mechanism 26, and the torque converter 20 by exciting / de-energizing the electromagnetic valve of the hydraulic pressure supply mechanism 80 based on the detection value sent from the sensor. Further, as described later, based on the detected rotational speeds N _DR , N _DN and hydraulic pressure, abnormality of the rotating shaft (for example, DN pulley shaft 16), specifically, peeling of the ball surface of the bearing supporting the rotating shaft, Determine the occurrence of abnormalities such as wear of the race.

  FIG. 6 is a flowchart showing an abnormality determination process of the rotating shaft (for example, the DN pulley shaft 16) executed by the shift controller 90.

To describe below, the shift controller 90 obtains the DN pulley rotation speed N _DN and the DN pulley hydraulic pressure P _DN from the outputs of the N _DN sensor 84 and the P _DN sensor 88 in S10 (S: processing step).

Next, the program proceeds to S12, and after performing the FFT analysis on the DN pulley hydraulic pressure P _DN obtained in S10 to obtain its frequency characteristics, the program proceeds to S14, where the frequency characteristics of the DN pulley hydraulic pressure P _DN obtained in S12 and DN Compare frequency characteristics of pulley rotation speed N _DN .

More specifically, as shown in FIG. 7, from the frequency characteristics of the DN pulley hydraulic pressure P _DN obtained in S12, a component that matches the frequency component of the DN pulley rotational speed N _DN is extracted, and the extracted frequency component is Determine whether the threshold is exceeded.

  If the determination in S14 is negative, it is determined that no abnormality has occurred in the DN pulley shaft 16, and the program is terminated. If the determination in S14 is affirmative, the process proceeds to S16, and there is an abnormality in the DN pulley shaft 16. It is determined that the shaft center of the DN pulley shaft 16 has shifted due to occurrence of an abnormality such as peeling of the ball surface of the bearing that supports the DN pulley shaft 16 to the transmission case 52 or wear of the bearing race portion.

That is, the structure of the DN pulley shaft 16 according to the third embodiment of the present invention is the same as that of the first or second embodiment described with reference to FIGS. In this case, part of the hydraulic oil to be supplied to the piston chamber 32b1 via the DN pulley shaft 16 leaks into the transmission case 52 via the leak oil holes 72a2 and 70b2 and the leak oil passages 74b and 74b ′. As a result, the value (hydraulic pressure) of the DN pulley hydraulic pressure P _DN varies.

Further, the fluctuation of the hydraulic pressure is correlated with the rotation of the feed pipes 70 and 70 ′ in which the leak oil holes 72 a 2 and 70 b 2 are formed, that is, the rotation of the DN pulley shaft 16. Therefore, by comparing and comparing the frequency component of the rotational speed of the DN pulley shaft 16 and the frequency component of the DN pulley hydraulic pressure _DN , it can be determined early and appropriately whether or not an abnormality has occurred in the DN pulley shaft 16. .

In the above description, the DN pulley shaft 16 has been described as an example, but the present invention is not limited to this. That is, for the DR pulley shaft 14, a hydraulic pressure sensor for detecting the hydraulic pressure of the hydraulic oil (DR pulley hydraulic pressure P _DR ) supplied to the piston chamber 30 b 1 of the DR pulley 30 is provided, and the rotational speed N _{DR of the} DR pulley 30 is provided. As a matter of course, it is also possible to determine an abnormality that has occurred in the DR pulley shaft 14 by comparison with the above.

As described above, in the third embodiment of the present invention, the hydraulic pressure detecting means (hydraulic sensor) 88 capable of detecting the hydraulic pressure P _DN in the hydraulic working chamber (for example, the piston chamber of the DN pulley 32) 32b1. If, when the working oil on the basis of the detected pressure P _DN is determined to be leaking from the leak oil hole 70A2,70b2, abnormality determining an abnormality in the automatic transmission 10 has occurred Since the determination means (shift controller 90; S10 to S16) is provided, it is possible to accurately determine abnormality of the rotating shaft (for example, the DN pulley shaft 16) with a simple configuration.

  The remaining configuration and effects are the same as those of the first and second embodiments.

  As described above, in the first to third embodiments of the present invention, a hollow rotating shaft (formally formed with the oil passages 14a, 16a that is rotatably supported in the transmission case 52 and extends in the axial direction. DR pulley shaft 14, DN pulley shaft 16) and hydraulic oil supply pipes (feed pipes) 70, 70 for supplying hydraulic oil from the transmission case 52 to the oil passages 14a, 16a of the DR, DN pulley shafts 14, 16. 'And a hydraulic working chamber (piston chamber) 30b1 provided on the DR and DN pulley shafts 14 and 16 and supplied with the hydraulic oil through the oil passages 14a and 16a of the DR and DN pulley shafts 14 and 16. , 32 b 1, the feed pipes 70, 70 ′ are located in the axial centers of the feed pipes 70, 70 ′ and the DR, DN pulley shafts 14, 16. Is sealed when the shaft centers of the feed pipes 70 and 70 'are not coincident with the shaft centers of the DR and DN pulley shafts 14 and 16, respectively. Leak oil holes 70a2 and 70b2 for leaking the hydraulic oil are provided.

  The automatic transmission 10 includes a continuously variable transmission (CVT mechanism 26) including pulleys (DR pulley 30 and DN pulley 32), and the hydraulic operation chamber is a piston chamber 30b1 of the DR and DN pulleys 30 and 32. , 32b1.

  In the first and third embodiments of the present invention, the feed pipe 70 has spherical portions (feed pipe tip portion 70a, feed pipe root portion 70b) at both axial ends, One (feed pipe root portion 70b) is swingably held by a spherical recess provided in the transmission case 52, and the other of the sphere portions (feed pipe tip portion 70a) is the DR, DN pulley shaft 14. , 16 hydraulic fluid supply holes (open oil holes) 70a1 for supplying the hydraulic oil to the oil passages 14a, 16a, and the leak oil hole 70a2 are swingably held in the oil passages 14a, 16a. It was configured to be provided.

  In the second and third embodiments of the present invention, the feed pipe 70 ′ can slide along the wall surface of the transmission case 52, and the feed pipe 70 ′ and the transmission The leak oil hole 70b2 is provided in the connection portion of the case 52.

In the third embodiment of the present invention, the hydraulic pressure detecting means (hydraulic sensor) 88 capable of detecting the hydraulic pressures P _DR and P _DN in the piston chambers 30b1 and 32b1, and the detected hydraulic pressure P _DR , An abnormality determining means (shift controller 90) that determines that an abnormality has occurred in the automatic transmission 10 when it is determined that the hydraulic oil is leaking from the leak oil holes 70a2 and 70b2 based on P _DN . S10 to S16).

10 automatic transmission, 12 input shaft (rotary shaft), 14 DR pulley shaft (rotary shaft), 14a oil passage, 16 DN pulley shaft (rotary shaft), 16a oil passage, 20 torque converter, 26 CVT mechanism, 30 DR pulley , 30b1 piston chamber (hydraulic working chamber), 32 DN pulley, 32b1 piston chamber (hydraulic working chamber), 36 forward / reverse switching mechanism, 52 transmission case, 52a oil passage, 60 hydraulic pump, 70, 70 ′ feed pipe, 70a , 70a ′ feed pipe tip, 70a2 leak oil hole, 70b, 70b ′ feed pipe root part, 70b2 leak oil hole, 72 cap, 74 (74a, 74b, 74b ′) leak oil path, 82 N _DR sensor (rotation speed) sensor), 84 N _DN sensor (rotational speed sensor) 88 P _DN sensor (oil pressure sensor), 90 shift controller (abnormality detection device , 100 holder

Claims (5)

A hollow rotary shaft that is rotatably supported in the transmission case and has an oil passage extending in the axial direction; and a hydraulic oil supply pipe that supplies hydraulic oil from the transmission case to the oil passage of the rotary shaft; An automatic transmission provided with a hydraulic working chamber provided on the rotating shaft and supplied with the hydraulic oil via an oil passage of the rotating shaft;
The hydraulic oil supply pipe is sealed when the axial center of the hydraulic oil supply pipe and the axial center of the rotary shaft coincide with each other, while the axial center of the hydraulic oil supply pipe and the axis of the rotary shaft An automatic transmission comprising a leak oil hole for leaking the hydraulic oil in the transmission case when the center does not coincide. The hydraulic oil supply pipe has a sphere at both axial ends,
One of the spheres is swingably held by a spherical recess provided in the transmission case,
The other of the spherical body portions is swingably held in the oil passage of the rotating shaft and is provided with a hydraulic oil supply oil hole for supplying the hydraulic oil to the oil passage and a leak oil hole. The automatic transmission according to claim 1. The hydraulic oil supply pipe is slidable along the wall surface of the transmission case,
The automatic transmission according to claim 1, wherein the leak oil hole is provided in a connection portion between the hydraulic oil supply pipe and the transmission case. The automatic transmission comprises a continuously variable transmission having a pulley,
The automatic transmission according to any one of claims 1 to 3, wherein the hydraulic operation chamber is a piston chamber of the pulley. A hydraulic pressure detecting means capable of detecting a hydraulic pressure in the hydraulic working chamber;
And an abnormality determining means for determining that an abnormality has occurred in the automatic transmission when it is determined that the hydraulic oil is leaking from the leak oil hole based on the detected hydraulic pressure. The abnormality detection device for an automatic transmission according to any one of claims 1 to 4, characterized in that:

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