JP2018123934A - Lubrication structure of power transmission device - Google Patents

Abstract

A lubrication structure for a power transmission device capable of efficiently supplying lubricating oil to a lubrication site with a simple configuration. SOLUTION: A casing 15 and a hole for forming an oil passage 18 on the upper side in the vertical direction of the oil passage 18 are formed from the outside of the casing 15, and a shaft member 22 that closes the hole and a power are transmitted by rotating. In the lubricating structure of the power transmission device, the casing 15 includes a rotating body, the lubricating oil scraped up by the rotating body is enclosed, and the lubricating oil drops on the oil passage 18 along the inner wall surface of the casing 15. A rib 19 for guiding the lubricating oil to the oil passage 18 is provided on the inner wall surface of the shaft, and an elastic member 23 communicating from the rib 19 to the opening 18 a of the oil passage 18 is provided. The elastic member 23 is an axis of the shaft member 22. In the direction between the shaft member 22 and the casing 15. [Selection] Figure 3

Description

  The present invention relates to a power transmission device such as a transmission, a transaxle, or a differential, and more particularly to a structure of an oil passage that supplies lubricating oil accommodated therein.

  Patent Document 1 describes a power transmission device for the purpose of improving lubricity in a casing. The casing in the power transmission device described in Patent Document 1 includes a casing body that houses various members such as gears, a cover member that closes the inside of the casing body, and a support body that supports a bearing (hereinafter simply referred to as bearing support). And a lubricating oil is sealed inside the casing. In the power transmission device, an oil groove communicating with the inside of the casing is formed on the fitting surface between the casing main body and the bearing support, in order to improve lubricity on the bearing support side, among the casings. In addition, an oil hole communicating with the oil groove is formed in the bearing support.

JP 2011-153680 A

  In the configuration of the power transmission device described in Patent Document 1, as described above, since the oil hole communicating with the oil groove is formed in the bearing support, the lubricity on the bearing support side can be improved. However, the oil hole formed in the bearing support or the hole for supplying the lubricating oil into the casing is provided with a plug for filling the hole so that the lubricating oil does not leak out of the casing. . The plug includes a shaft portion (for example, a screw portion) having a predetermined length. Since the shaft portion projects into the casing, the lubricating oil in the casing scatters and adheres to the shaft portion. In such a case, the adhering lubricating oil falls along the shaft portion, so the locus of the lubricating oil assumed in advance changes and the supply of the lubricating oil to each lubricating part such as the bearing support side is hindered. There is a risk. Further, if the supply of lubricating oil is hindered in this way, the lubrication amount required for the lubrication site is not supplied, so the overall lubrication amount increases, which may lead to an increase in cost, and there is room for improvement. was there.

  The present invention has been made paying attention to the above technical problem, and an object thereof is to provide a lubricating structure for a power transmission device that can efficiently supply lubricating oil to a lubricating portion with a simple configuration. To do.

  In order to achieve the above-described object, the present invention provides a casing, a shaft member for forming the oil passage on the upper side in the vertical direction of the oil passage from the outside of the casing, a shaft member for closing the hole, and a rotation And a rotator that transmits motive power, and is configured so that the lubricating oil scraped up by the rotator is enclosed and the lubricating oil drops onto the oil passage along the inner wall surface of the casing. In the lubrication structure of the transmission device, a rib that guides the lubricating oil to the oil passage is provided on the inner wall surface of the casing, and includes an elastic member that communicates with the opening of the oil passage from the rib. It is provided between the shaft member and the casing in the axial direction of the shaft member.

  According to this invention, the lubricating oil that flows along the inner wall surface of the casing is configured to be supplied to the oil passage along the rib and the elastic member. Specifically, a rib that guides lubricating oil to the oil passage is provided on the inner wall surface of the casing, and an elastic member is provided between the shaft member that closes the hole forming the oil passage and the casing. Furthermore, the elastic member is provided so as to communicate between the rib and the opening of the oil passage. That is, the lubricating oil is configured to drop through the opening of the oil passage along the rib and the elastic member. Therefore, the lubricating oil that flows along the inner wall surface of the casing is supplied to the oil passage without adhering to the above-described shaft member. That is, the flow of the oil passage can be prevented from being obstructed by the shaft member, and as a result, sufficient lubricating oil can be supplied to each lubricating portion.

  The elastic member also functions as a locking member for the shaft member. For example, even when the shaft member is loosened due to vibration of an engine or the like, it is possible to prevent the shaft member from being loosened by the reaction force of the elastic member. That is, by providing the elastic member in this manner, the above-described function of supplying the lubricating oil to the oil passage and the function of preventing the shaft member from loosening can be provided.

1 is a block diagram schematically showing a power train of a vehicle in an embodiment of the present invention. It is a figure which shows typically the transaxle in the vehicle of FIG. It is a figure which shows the structure of the oil path in embodiment of this invention. It is a figure which shows an example of the elastic member applied to the structure of the oil path of FIG. It is a figure which shows the other example of the elastic member applied to the structure of the oil path of FIG. It is a figure which shows the further another example of the elastic member applied to the structure of the oil path of FIG.

  Next, the present invention will be described more specifically. The power transmission device targeted by the present invention may be a power transmission device used in vehicles, various industrial machines, or the like, as long as it is configured to transmit power by gears or the like. Further, the power transmission device targeted by the present invention is configured to perform so-called scraping lubrication by a rotating body, and therefore, oil is enclosed in the casing together with the rotating body such as a gear.

  FIG. 1 is a vehicle schematically showing an example of a power transmission device as a target in an embodiment of the present invention. As is known in the art, a transmission 2 is connected to the output side of an engine (ENG) 1 so that the driving torque output from the transmission 2 is transmitted to the left and right driving wheels 4 through a differential 3. It is configured. In the example shown in FIG. 1, this vehicle is a hybrid vehicle Ve, and the hybrid vehicle Ve includes two motors of an engine 1 and a first motor (MG1) 5 and a second motor (MG2) 6. This is a hybrid vehicle Ve. The hybrid vehicle Ve is equipped with an engine 1 as a main prime mover, and transmits the power output from the engine 1 to the first motor 5 side and the drive shaft side by a power split mechanism. It is configured. Further, the electric power generated by the first motor 5 is supplied to the second motor 6, and the driving force output from the second motor 6 can be applied to the driving shaft and the driving wheel 4.

  The hybrid vehicle Ve shown in FIG. 1 is the same as a conventionally known configuration, and the configuration will be described with reference to FIGS. 1 and 2. FIG. 2 is a diagram schematically showing a transaxle 7 in a hybrid vehicle including the transmission 2 and the differential 3. More specifically, an input shaft (not shown) connected to a crankshaft (not shown) that is an output shaft of the engine 1 so as to transmit torque is provided, and a sun gear, a carrier, and a ring gear are connected to the input shaft. A single pinion type planetary gear mechanism (hereinafter simply referred to as a planetary gear mechanism) is connected as a rotating element. The planetary gear mechanism is configured to function as a power split mechanism 8 that splits power into the first motor 5 and the drive wheels 4. Specifically, a sun gear connected to the first motor 5, a pinion gear meshing with the sun gear is held so as to be able to rotate and revolve, and a carrier coupled to the input shaft and a ring gear meshing with the pinion gear are configured. Yes. Between the output shaft and the input shaft, a damper mechanism 9 that suppresses torsional vibration of the output shaft caused by torque fluctuation or vibration of the engine 1, a torque converter 10 having a function of amplifying torque, and the like. The mechanism is arranged.

  A drive shaft is connected to the power split mechanism 8. Specifically, the drive shaft is coupled to the ring gear of the power split mechanism 8 via the counter gear 11 and the differential 3 so that power can be transmitted. That is, the engine 1 and the first motor 5 are connected to the drive shaft and the drive wheels 4 through the power split mechanism 8, the counter gear 11, and the differential 3, respectively, so that power can be transmitted to each other. As described above, the torque output from the second motor 6 can be added to the torque transmitted from the power split mechanism 8 to the drive shaft and the drive wheels 4. The second motor 6 output shafts are arranged in parallel with the input shaft, the counter shaft, and the drive shaft.

  The above-described transaxle 7 is housed in three housing members. Specifically, a case 12 formed in a bottomed cylindrical shape, a rear cover 13 that closes an opening of the case 12, and a case 12 are provided. It is accommodated in a bottomed cylindrical housing 14 that is disposed on the opposite side of the rear cover 13 and that is assembled so that the opening is closed by the bottom surface of the case 12. More specifically, the power train mechanism 8, the counter gear 11, and the gear train such as the differential 3 are accommodated in a space formed by the case 12 and the housing 14, and the motors 5 and 6 are connected to the case 12. It is accommodated in a space formed by the rear cover 13. Further, as described above, mechanisms such as the damper mechanism 9 and the torque converter 10 are disposed between the output shaft and the input shaft, and these mechanisms are accommodated in a space in the housing 14. And it is comprised so that it may function as one casing 15 by fastening the end surface in the axial direction of each housing member of these housing 14, case 12, and rear cover 13 with a volt | bolt etc.

  As described above, a plurality of power transmission members are accommodated in the casing 15. That is, this power transmission device performs an action such as changing the rotation speed of the input side member and the rotation speed of the output side rotation member at a predetermined ratio, or changing the rotation direction. It has a plurality of relative rotating members such as gears and bearings. And since inevitable slip occurs between these relatively rotating members, lubricating oil (hereinafter also referred to as oil) is supplied to the place where the slip occurs in order to suppress wear or cool down. Is common. As the lubrication method, for example, so-called forced lubrication in which lubricating oil pressurized by an oil pump is supplied to a lubrication target site via a pre-provided oil passage, or lubricating oil scraped up by a rotating member such as a gear There is known so-called scooping lubrication or the like that supplies a lubricating oil that is supplied to a lubrication site arranged in the scattering direction or that naturally drops (gravity drop) after being scraped up to a predetermined lubrication site.

  The vehicle Ve shown in FIGS. 1 and 2 is provided with the oil pump 16 in the rear cover 13 described above. The oil pump 16 is a mechanical oil pump having a general configuration used for the engine 1 and the transmission 2 of a conventional vehicle, and is configured to generate hydraulic pressure by being driven by torque output from the engine 1. Yes. More specifically, the rotor shaft of the oil pump 16 is configured to rotate together with the output shaft of the engine 1. Therefore, when the engine 1 is burned and outputs torque from the output shaft, the oil pump 16 is also driven to generate hydraulic pressure. Then, the oil discharged from the oil pump 16 is supplied to each lubricating part such as the power split mechanism 8 and the motors 5 and 6 through an oil passage (not shown). An oil pan 17 that functions as an oil reservoir is formed at the bottom of the housing 14, casing 15, and rear cover 13, and oil pumped from the oil pan 17 is also used as a diff ring gear in the differential 3. It is configured to be scraped up by a rotating body.

  In the power transmission device configured as described above, lubricating oil is sealed in the casing 15, and each lubricating portion such as a shaft portion and a gear is lubricated and cooled by the lubricating oil. Therefore, an oil hole or an oil passage is formed in the casing 15 in order to supply the lubricating oil to each lubricating part such as the shaft and gear. FIG. 3 is a diagram showing an example of the configuration of the oil passage 18. In this embodiment, the oil passage preliminarily provided with lubricating oil scattered on the inner wall surface of the housing 14 (upper wall surface 14 a in the example of FIG. 3). A rib 19 that leads to 18 is provided along the upper wall surface 14 a of the housing 14. Further, the oil passage 18 connected to a lubrication site such as a bearing is provided on the lower side in the vertical direction of the end portion of the rib 19. Then, a through hole is formed in the side wall surface 14b of the housing 14 with a drill or the like so that the lubricating oil transmitted through the rib 19 is dropped into the opening 18a of the oil passage 18 to form an oil hole 20. As a result, as shown in FIG. 3, the end of the rib 19 and the opening 18 a of the oil passage 18 are connected in a linear direction, so that the lubricating oil transmitted through the rib 19 drops toward the opening 18 a of the oil passage 18. .

  On the other hand, the through hole opened to form the oil hole 20 is closed by a plug 21 or a bolt so that the lubricating oil does not leak out of the housing 14. In such a case, since the plug 21 and the bolt shaft member 22 project into the housing 14, there is a possibility that the lubricating oil may be dropped from the rib 19 described above to the opening 18 a. Specifically, when the lubricating oil drops or adheres to the shaft member 22 of the plug 21, the lubricating oil does not fall toward the opening 18 a of the oil passage 18, that is, the locus of the lubricating oil dripping changes, and the bearing or the like There is a risk that the amount of lubrication at each lubrication site will decrease. Therefore, in the embodiment of the present invention, the elastic member 23 is brought into contact with the rib 19 so that the lubricating oil transmitted through the rib 19 surely drops onto the opening 18a of the oil passage 18, and the lubrication transmitted through the rib 19 is achieved. The oil is configured to be guided to the oil passage 18 via the elastic member 23. The rib 19 may have a function as a member for reinforcing the housing 14 as well as a function as a guide path for guiding the lubricating oil, and is provided at a predetermined interval in the rotation direction. May be.

  The elastic member 23 is, for example, a leaf spring as shown in FIG. 4 (hereinafter referred to as a leaf spring 23 unless otherwise specified), and the leaf spring 23 is a shaft member as shown in FIG. In the axial direction of 22, it is provided between the distal end portion of the shaft member 22 and the housing 14. In addition, when the plug 21 is inserted into the leaf spring 23, an elastic force acts, and one end portion (the upper side in the example of FIG. 3) of the leaf spring 23 contacts the end portion of the rib 19 described above. Further, the other end (lower side in the example of FIG. 3) of the leaf spring 23 is configured to reach the opening 18 a of the oil passage 18. That is, the leaf spring 23 is fixed to the housing 14 by the plug 21, and when the elastic force of the leaf spring 23 acts, the leaf spring 23 is in contact with the rib 19 at least in the communication direction of the oil passage 18, and , And has a length communicating with the oil passage 18. In the example shown in FIGS. 3 and 4, the leaf spring 23 has a “<” shape that is convex in the direction opposite to the plug 21 side in the axial direction of the shaft member 22. The direction in which 23 bends may be the opposite direction. That is, it may be configured such that the convex portion of the “<” shape is on the plug 21 side.

  As described above, the power transmission device configured as described above includes a mechanism such as the damper mechanism 9 and the torque converter 10 accommodated in the housing 14, and these mechanisms rotate and are enclosed in the casing 15. The lubricating oil is supplied to the lubricating part by scraping and rotating the lubricating oil. More specifically, the lubricating oil scooped up by a rotating body such as the torque converter 10 adheres to the upper wall surface 14a of the inclined housing 14 and travels through the rib 19 provided on the upper wall surface 14a of the housing 14. Dripping by gravity. In the embodiment of the present invention, the leaf spring 23 is provided between the shaft member 22 and the housing 14 as described above. The one end of the leaf spring 23 is configured to contact the rib 19, and the other end of the leaf spring 23 is configured to communicate with the oil passage 18. Therefore, the lubricating oil drops from the rib 19 through the leaf spring 23 to the opening 18a of the oil passage 18 as indicated by the broken arrow in FIG.

  That is, since the lubricating oil can be reliably dropped onto the oil passage 18, it can be avoided that the lubricating oil adheres to the shaft member 22 of the plug 21 as described above, and as a result, the lubricating oil is sufficiently applied to each lubricating portion. Inconveniences such as not being supplied to the printer can be eliminated. In addition, the lubricating oil can be supplied to the lubricating portion without obstructing the flow of the lubricating oil due to the shape of the plug 21 or the bolt. Furthermore, since the lubricating oil can be reliably supplied to the lubrication site in this way, it can be efficiently lubricated or cooled, so that an excessive increase in the amount of lubrication can be suppressed or avoided. The costs associated therewith can also be reduced.

  Then, by providing the plate spring 23, the plate spring 23 functions as a locking member for the shaft member 22. That is, even when the shaft member 22 is loosened by the vibration of the engine or the like and the plug 21 and the shaft member 22 are loosened, the above-described loosening can be suppressed by the reaction force of the leaf spring 23. In other words, the shaft member 22 has a function as a spring washer (spring washer) used when fastening a general bolt, that is, the function of guiding the lubricating oil to the oil passage 18 only by the leaf spring 23. It can also have a function as an anti-loosening mechanism. In addition, since the plate spring 23 is pushed in by the plug 21, the plate spring 23 can be securely fixed between the rib 19, the oil passage 18, and the housing 14, and as a result, the lubricating oil smoothly flows. Guided to path 18.

  Further, the elastic member in the embodiment of the present invention may be an elastic member as shown in FIGS. 5 and 6 in addition to the plate spring 23 as described above. FIG. 5 is a modification of the leaf spring 23 of FIG. 4 and is configured to have a concave shape in order to allow the lubricating oil to communicate more smoothly. On the other hand, the elastic member shown in FIG. 6 is a disc spring 24. Even when the disc spring 24 is provided, the same operation and effect as the leaf spring 23 can be obtained.

  The embodiment of the present invention has been described above. However, the present invention is not limited to the above-described example, and may be appropriately changed within the scope of achieving the object of the present invention. In the above-described embodiment, the oil hole 20 formed in the housing 14 has been described. However, for example, the oil hole 20 in the case 12 may be the target. That is, the embodiment of the present invention is applied to a place where the shaft member 22 such as the plug 21 may hinder the supply of the lubricating oil when the lubricating oil is dropped by gravity. Therefore, in addition to the above example, for example, the present invention may be applied to a connecting member in each connecting portion of the casing 15. Specifically, in the connecting portion 25 between the housing 14 and the case 12 among the housing members in the casing 15 shown in FIG. 2, when the connecting portion 25 is fixed by a connecting member such as a bolt, the shaft member of the bolt In order to avoid that the lubricating oil adheres to 22 and the lubricating oil is not sufficiently supplied to each lubricating portion, the same configuration as that of the above-described embodiment may be adopted.

  In the above-described embodiment, the hybrid vehicle Ve has been described as the power transmission device. However, the vehicle is not limited to the hybrid vehicle, and is driven by engaging or releasing an engagement mechanism such as a clutch or a brake. A vehicle equipped with a stepped transmission that changes speed by changing the torque transmission path or a belt-type continuously variable transmission that can continuously change the gear ratio by changing the belt wrapping radius around the pulley. It may be.

  DESCRIPTION OF SYMBOLS 3 ... Differential, 9 ... Damper mechanism, 10 ... Torque converter, 12 ... Case, 13 ... Rear cover, 14 ... Housing, 14a ... Upper wall surface, 14b ... Side wall surface, 15 ... Casing, 18 ... Oil path, 18a ... Opening part, 19 ... rib, 20 ... oil hole, 21 ... plug, 22 ... shaft member, 23 ... leaf spring, 24 ... disc spring.

Claims (1)

A casing, a hole for forming the oil path on the upper side in the vertical direction of the oil path is formed from the outside of the casing, and includes a shaft member that closes the hole, and a rotating body that transmits power by rotating, In a lubricating structure of a power transmission device configured to enclose lubricating oil scraped up by the rotating body and to drop the lubricating oil onto the oil passage along an inner wall surface of the casing,
Ribs for guiding the lubricating oil to the oil passage are provided on the inner wall surface of the casing,
An elastic member communicating from the rib to the opening of the oil passage;
The lubricating structure of a power transmission device, wherein the elastic member is provided between the shaft member and the casing in an axial direction of the shaft member.

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