CN111750071A - Method for manufacturing drum of power transmission device and power transmission device - Google Patents
Method for manufacturing drum of power transmission device and power transmission device Download PDFInfo
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- CN111750071A CN111750071A CN202010210540.8A CN202010210540A CN111750071A CN 111750071 A CN111750071 A CN 111750071A CN 202010210540 A CN202010210540 A CN 202010210540A CN 111750071 A CN111750071 A CN 111750071A
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- coupling member
- parking gear
- gear
- power transmission
- parking
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 117
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000008878 coupling Effects 0.000 claims description 241
- 238000010168 coupling process Methods 0.000 claims description 241
- 238000005859 coupling reaction Methods 0.000 claims description 241
- 230000002093 peripheral effect Effects 0.000 claims description 88
- 244000126211 Hericium coralloides Species 0.000 claims description 13
- 238000004080 punching Methods 0.000 claims description 6
- 238000005304 joining Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 abstract description 40
- 238000003466 welding Methods 0.000 description 29
- 239000003921 oil Substances 0.000 description 20
- 238000010586 diagram Methods 0.000 description 12
- 238000003754 machining Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- 238000005242 forging Methods 0.000 description 9
- 239000010720 hydraulic oil Substances 0.000 description 9
- 238000010791 quenching Methods 0.000 description 9
- 230000000171 quenching effect Effects 0.000 description 9
- 238000005255 carburizing Methods 0.000 description 1
- 238000010273 cold forging Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/14—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass gear parts, e.g. gear wheels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/023—Mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/08—General details of gearing of gearings with members having orbital motion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02039—Gearboxes for particular applications
- F16H2057/02043—Gearboxes for particular applications for vehicle transmissions
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Details Of Gearings (AREA)
Abstract
The invention provides a method for manufacturing a drum part of a power transmission device, which can reduce cutting parts and processing time when the drum part is formed. The power transmission device includes a transmission that shifts a speed of power input to an input member and transmits the power to an output member, the transmission including a drum portion having a bottomed tubular shape, the drum portion being connected to an intermediate member and the output member in a power transmission path from the input member to the output member, the drum portion including a parking gear of a parking device, a first connecting member connected to the intermediate member and the parking gear, and a second connecting member connected to the parking gear and the output member via a joint portion, respectively, wherein in a manufacturing method of the drum portion of the power transmission device, the first connecting member is formed, the second connecting member is formed along with press working, and the parking gear is joined to the second connecting member and connects the parking gear to the first connecting member.
Description
Technical Field
The present invention relates to a method of manufacturing a drum portion of a power transmission device and a power transmission device.
Background
Conventionally, as such a power transmission device, a power transmission device having an automatic transmission that shifts a speed of power input to an input member and transmits the power to an output member has been proposed (for example, see patent document 1). The automatic transmission includes a drum portion having a bottomed tubular shape that connects a ring gear of the planetary gear mechanism with an output member, and the drum portion includes a tubular first connecting member integrally formed with the ring gear, a parking gear of a parking device, and a second connecting member integrally formed with the parking gear, fitted with the first connecting member, and fixed to the output member by welding.
Patent document 1: japanese patent laid-open No. 2014-190485
In the above-described power transmission device, the second coupling member of the drum portion is integrally formed with the parking gear, and therefore, it is necessary to form the entire second coupling member by cutting. Therefore, the number of cutting portions increases, and the machining time becomes long. This results in an increase in material costs and processing costs.
Disclosure of Invention
The invention provides a method for manufacturing a drum part of a power transmission device and a power transmission device, and aims to reduce cutting parts and processing time when the drum part is formed.
In order to achieve the above-described main object, a method of manufacturing a drum portion of a power transmission device and a power transmission device according to the present invention adopt the following technical means.
The invention provides a method for manufacturing a drum part of a power transmission device,
the power transmission device includes a transmission that changes a speed of power input to an input member and transmits the power to an output member,
the transmission includes a drum portion having a bottomed tubular shape, the drum portion being connected to the output member and an intermediate member in a power transmission path from the input member to the output member,
the drum portion has a parking gear of a parking device, a first coupling member connected to the intermediate member and the parking gear, and a second coupling member connected to the parking gear and the output member via a joint portion, respectively,
the method for manufacturing the drum part of the power transmission device comprises the following steps:
a step (a) of forming the first coupling member, forming the second coupling member with press working, and forming the parking gear; and
and (b) joining the parking gear to the second coupling member and connecting the parking gear to the first coupling member.
In the method of manufacturing the drum portion of the power transmission device of the present invention, the first coupling member is formed, the second coupling member is formed along with the press working, the parking gear is formed, the parking gear is joined to the second coupling member, and the parking gear is connected to the first coupling member. Thus, the second coupling member and the parking gear can be formed separately by press working (if necessary, the portion of the second coupling member to be joined to the parking gear or the output member may be cut). Therefore, compared to the case where the second coupling member and the parking gear are integrally formed by cutting, the number of cut portions and the processing time when the second coupling member is formed can be reduced, and further the number of cut portions and the processing time when the drum portion is formed can be reduced. As a result, material costs and machining costs for forming the drum portion can be reduced.
The power transmission device of the present invention includes a transmission for shifting power input to an input member and transmitting the power to an output member,
the transmission includes a drum portion having a bottomed tubular shape, the drum portion being connected to the output member and an intermediate member in a power transmission path from the input member to the output member,
the drum portion has a parking gear of a parking device, a first coupling member connected to the intermediate member and the parking gear, and a second coupling member as a press-worked member connected to the parking gear and the output member via joint portions, respectively.
In the power transmission device of the present invention, the transmission includes a drum portion having a bottomed tubular shape, the drum portion being connected to the intermediate member and the output member in a power transmission path from the input member to the output member, and the drum portion includes a parking gear of the parking device, a first coupling member connected to the intermediate member and the parking gear, and a second coupling member as a press-worked member connected to the parking gear and the output member via the joint portion, respectively. Thus, the second coupling member and the parking gear can be formed separately by press working (if necessary, the portion of the second coupling member to be joined to the parking gear or the output member may be cut). Therefore, compared to the case where the second coupling member and the parking gear are integrally formed by cutting, the number of cut portions and the processing time when the second coupling member is formed can be reduced, and further the number of cut portions and the processing time when the drum portion is formed can be reduced. As a result, material costs and machining costs for forming the drum portion can be reduced. Here, the joint may be a welded portion.
Drawings
Fig. 1 is a schematic configuration diagram of a power transmission device 20 of the present invention.
Fig. 2 is an operation table showing the relationship between the respective shift speeds of the automatic transmission 25 and the operating states of the clutches C1 to C4 and the brakes B1 and B2.
Fig. 3 is a speed line diagram illustrating a relationship of rotation speeds between rotating members constituting the automatic transmission 25.
Fig. 4 is a partial sectional view showing the periphery of the drum portion 40 of the power transmission device 20.
Fig. 5 is a process diagram showing a manufacturing process of the drum unit 40.
Fig. 6 is an explanatory diagram illustrating a case of manufacturing the drum portion 40.
Fig. 7 is a partial sectional view showing the periphery of the drum portion 40B.
Fig. 8 is a process diagram showing a manufacturing process of the drum portion 40B.
Fig. 9 is an explanatory diagram illustrating a case of manufacturing the drum portion 40B.
Description of the reference numerals:
20 power transmission device, 22 transmission case, 23 starting device, 23C lock-up clutch, 23d damper mechanism, 23o one-way clutch, 23p pump impeller, 23s stator, 23t turbine, 24 oil pump, 25 automatic transmission, 26 input member, 27 output member, 271 cylindrical portion, 272 flange portion, 30 first planetary gear mechanism, 31 sun gear, 32 ring gear, 33a, 33B pinion gear, 34 carrier, 35 second planetary gear mechanism, 36a first sun gear, 36B second sun gear, 37 ring gear, 37a spline, 38a short pinion gear, 38B long pinion gear, 39 carrier, 40B drum portion, 40A, 40C bottomed cylindrical member, 41B parking gear, 411B gear portion, 412B annular portion, 413B, 414B flange portion, 415B first step portion, 416B second step portion, 42B first coupling member, step portion, 421. 421B cylindrical portion, 422B flange portion, 423 comb portion, 423B spline, 424B recess, 43B second coupling member, 431B annular portion, 432 outer cylindrical portion, 433 inner cylindrical portion, 433B cone portion, 50 snap ring, B1, B2 brake, C1-C4 clutch.
Detailed Description
Next, a mode for carrying out the present invention will be described with reference to the drawings.
Fig. 1 is a schematic configuration diagram of a power transmission device 20 of the present invention. The power transmission device 20 shown in the drawing is connected to a crankshaft of an engine (not shown) as a driving source mounted vertically on a front portion of a rear-wheel drive vehicle, and can transmit power from the engine to left and right driving wheels (rear wheels) (not shown). As shown in the drawing, the power transmission device 20 includes a transmission case (stationary member) 22, a starting device (hydraulic power transmission device) 23 housed inside the transmission case 22, an oil pump 24, an automatic transmission 25, a differential gear (differential mechanism) not shown, and the like.
The starting device 23 is configured as a torque converter having an input-side pump impeller 23p connected to a crankshaft of the engine, an output-side turbine impeller 23t connected to an input member 26 of the automatic transmission 25, a stator 23s disposed inside the pump impeller 23p and the turbine impeller 23t and rectifying a flow of the hydraulic oil from the turbine impeller 23t to the pump impeller 23p, a one-way clutch 23o that restricts a rotation direction of the stator 23s to one direction, a lock-up clutch 23c, a damper mechanism 23d, and the like. However, the starting device 23 may be configured as a fluid coupling without the stator 23 s.
The oil pump 24 is configured as a gear pump including a pump body and a pump cover, an external gear connected to the pump wheel 23p of the starting device 23 via a hub, an internal gear meshing with the external gear, and the like. The oil pump 24 is driven by power from the engine, sucks hydraulic oil (ATF) stored in an oil pan (not shown), and pressure-feeds the ATF to a hydraulic control device (not shown).
The automatic transmission 25 is configured as an 8-speed transmission, and includes, as shown in fig. 1, an input member 26, an output member 27, a double-pinion first planetary gear mechanism 30, a ravigneaux second planetary gear mechanism 35, four clutches C1 to C4 for changing a power transmission path from an input side to an output side, and two brakes B1 and B2. The power transmitted from the input member 26 to the output member 27 is transmitted to the left and right drive wheels via a differential gear and a drive shaft, not shown.
The first planetary gear mechanism 30 of the automatic transmission 25 includes: a sun gear 31 as an external gear; a ring gear 32 as an internal gear disposed concentrically with the sun gear 31; and a carrier 34 that holds a plurality of sets of two pinion gears 33a, 33b that mesh with each other and one of which meshes with the sun gear 31 and the other of which meshes with the ring gear 32 so as to be rotatable (rotatable) and revolvable. As shown in the drawing, the sun gear 31 of the first planetary gear mechanism 30 is fixed to the transmission case 22, and the carrier 34 of the first planetary gear mechanism 30 is connected to the input member 26 so as to be integrally rotatable. The first planetary gear mechanism 30 is configured as a so-called reduction gear, and reduces the speed of power transmitted to a carrier 34 as an input member and outputs the power from a ring gear 32 as an output member.
The second planetary gear mechanism 35 of the automatic transmission 25 has: a first sun gear 36a and a second sun gear 36b as external gears; a ring gear 37 as an internal gear arranged on a concentric circle with the first sun gear 36a and the second sun gears 36a and 36 b; a plurality of short pinion gears 38a engaged with the first sun gear 36 a; a plurality of long pinions 38b that mesh with the second sun gear 36b and the plurality of short pinions 38a, and mesh with the ring gear 37; and a carrier 39 that holds the plurality of short pinion gears 38a and the plurality of long pinion gears 38b so as to be rotatable (rotatable) and revolvable. The ring gear 37 of the second planetary gear mechanism 35 is coupled to the output member 27 via the drum portion 40.
The clutch C1 is a multi-plate friction type hydraulic clutch (frictional engagement element) having a hydraulic servo including a piston, a plurality of friction plates and release plates, an oil chamber to which hydraulic oil is supplied, and the like, and is capable of fastening and releasing the fastening of the ring gear 32 of the first planetary gear mechanism 30 and the first sun gear 36a of the second planetary gear mechanism 35. The clutch C2 is a multi-plate friction type hydraulic clutch having a hydraulic servo constituted by a piston, a plurality of friction plates and separator plates, an oil chamber to which hydraulic oil is supplied, and the like, and is capable of fastening and releasing the fastening of the input member 26 and the carrier 39 of the second planetary gear mechanism 35. The clutch C3 is a multi-plate friction type hydraulic clutch having a hydraulic servo constituted by a piston, a plurality of friction plates and release plates, an oil chamber to which hydraulic oil is supplied, and the like, and is capable of fastening and releasing the fastening of the ring gear 32 of the first planetary gear mechanism 30 and the second sun gear 36b of the second planetary gear mechanism 35. The clutch C4 is a multi-plate friction type hydraulic clutch having a hydraulic servo constituted by a piston, a plurality of friction plates and release plates, an oil chamber to which hydraulic oil is supplied, and the like, and is capable of fastening and releasing the fastening of the carrier 34 of the first planetary gear mechanism 30 and the second sun gear 36b of the second planetary gear mechanism 35.
The brake B1 is a multiple-plate friction type oil brake, has a hydraulic servo composed of a plurality of friction plates, release plates, an oil chamber to which hydraulic oil is supplied, and the like, and can fix the second sun gear 36B of the second planetary gear mechanism 35 to the transmission case 22 so that the second sun gear 36B is not rotatable, and can release the fixation of the second sun gear 36B to the transmission case 22. The brake B2 is a multi-plate friction type oil brake that has a hydraulic servo including a plurality of friction plates, separator plates, an oil chamber to which hydraulic oil is supplied, and the like, and can fix the carrier 39 of the second planetary gear mechanism 35 to the transmission case 22 so that the carrier 39 cannot rotate, and can release the fixation of the carrier 39 to the transmission case 22.
The clutches C1 to C4 and the brakes B1 and B2 are operated by receiving supply and discharge of hydraulic oil from a hydraulic control device, not shown. Fig. 2 is an operation table showing the relationship between the respective shift speeds of the automatic transmission 25 and the operation states of the clutches C1 to C4 and the brakes B1 and B2, and fig. 3 is a speed line diagram illustrating the relationship between the rotation speeds of the rotary members constituting the automatic transmission 25. The automatic transmission 25 changes the clutches C1 to C4 and the brakes B1 and B2 to the states shown in the operation table of fig. 2, thereby providing the forward 1 to 8 gear shift stages and the reverse 1 and 2 gear shift stages. At least one of the clutches C1 to C4 and the brakes B1 and B2 may be an engagement member such as a dog clutch.
Fig. 4 is a partial sectional view showing the periphery of the drum portion 40 of the power transmission device 20. As shown in the drawing, a spline 37a is formed on the outer peripheral surface of the ring gear 37 of the second planetary gear mechanism 35. An annular recess 37b that is recessed radially inward over the entire circumference is formed on the outer circumferential surface of the spline 37 a.
The output member 27 has a cylindrical portion 271 having a cylindrical shape and a flange portion 272 extending radially outward from one end portion (left end portion in fig. 4) of the cylindrical portion 271 in the axial direction. The cylindrical portions 271 are each coupled to left and right drive wheels via a differential gear and a drive shaft, not shown.
The drum portion 40 couples the ring gear 37 of the second planetary gear mechanism 35 to the output member 27, and the drum portion 40 includes a parking gear 41 of the parking device, a first coupling member 42 coupled to the ring gear 37 and connected (fixed) to the parking gear 41, and a second coupling member 43 connected (fixed) to the parking gear 41 and the output member 27. The parking device is configured as a device that locks and unlocks the output member 27 of the automatic transmission 25, that is, performs parking lock and parking lock release.
The parking gear 41 is a forged part formed by, for example, forging, quenching, and cutting, and includes: a cylindrical gear portion 411 having a plurality of external teeth; an annular ring portion 412 extending in the axial direction from one axial end (left end in fig. 4) of the inner peripheral portion of the gear portion 411; and an annular flange 413 extending radially inward from the other end (right end in fig. 4) of the gear 411 in the axial direction. Examples of the forging include hot forging and cold forging, and examples of the quenching include induction quenching and carburizing and quenching. The parking gear 41 has a stepped portion 415 formed by one end surface (left end surface in fig. 4) of the gear portion 411 in the axial direction and the outer peripheral surface of the annular portion 412.
The first coupling member 42 is a press-formed member formed substantially by press working, and includes a cylindrical portion 421 having a cylindrical shape and an annular flange portion 422 extending radially inward from one end portion (right end portion in fig. 4) in the axial direction of the cylindrical portion 421. The inner peripheral surface of the flange portion 422 is fixed to the outer peripheral surface of the annular portion 412 of the parking gear 41 by welding in a state where the flange portion 422 and the stepped portion 415 are in contact in the axial direction (a state where an end surface of the flange portion 422 in the axial direction and an end surface of the gear portion 411 of the parking gear 41 in the axial direction are in contact with each other). Therefore, the inner peripheral surface of the flange portion 422 and the outer peripheral surface of the annular portion 412 of the parking gear 41 are connected via a welded portion (a joint portion formed by welding).
A comb tooth portion 423 having a comb tooth shape is formed at the other end portion of the cylindrical portion 421 in the axial direction, and a recess 424 that is recessed radially outward is formed on the inner circumferential surface of each tooth of the comb tooth portion 423. The comb teeth 423 are formed by cutting. The ring gear 37 of the second planetary gear mechanism 35 and the first coupling member 42 are coupled to each other by a spline 37a formed on the outer peripheral surface of the ring gear 37 being fitted into a comb tooth portion 423 of the first coupling member 42, and a snap ring 50 being interposed between an annular concave portion 37b of the spline 37a and a concave portion 424 of the comb tooth portion 423. At this time, a gap is formed between the end surface of the ring gear 37 on the first coupling member 42 side (right side in fig. 4) in the axial direction and two adjacent teeth of the comb tooth portion 423 so as to communicate the inside and outside of the drum portion 40 in the radial direction.
The second coupling member 43 is a press-worked member formed substantially by press working, and includes: an annular portion 431, a cylindrical outer cylinder 432 extending from the outer periphery of the annular portion 431 toward the second planetary gear mechanism 35 in the axial direction (the left side in fig. 4), and a cylindrical inner cylinder 433 extending from the inner periphery of the annular portion 431 toward the same side as the outer cylinder 432 in the axial direction. The outer diameter of the outer tube 432 is designed to be smaller than the inner diameter of the flange 422 of the first coupling member 42. The outer peripheral surface of the free end portion of the outer tube portion 432 is fixed to the inner peripheral surface of the flange portion 413 of the parking gear 41 by welding. The inner peripheral surface of the free end portion of the inner tube portion 433 is fixed to the outer peripheral surface of the flange portion 272 of the output member 27 by welding. Therefore, the outer circumferential surface of the free end portion of the outer cylindrical portion 432 and the inner circumferential surface of the flange portion 413 of the parking gear 41 are connected via a welded portion, and the inner circumferential surface of the free end portion of the inner cylindrical portion 433 and the outer circumferential surface of the flange portion 272 of the output member 27 are connected via a welded portion.
In the present embodiment, since the first coupling member 42 of the drum portion 40 is formed separately from the ring gear 37 and the parking gear 41 of the second planetary gear mechanism 35, the first coupling member 42 may be formed as a press-formed member by press working, and the inner peripheral surface of the flange portion 422 (the portion to be welded to the annular portion 412 of the parking gear 41) and the comb portion 423 (the portion to be fitted to the spline 37a of the ring gear 37) may be cut as necessary. Thus, compared to the case where the first coupling member 42 is integrally formed with the ring gear 37 and the parking gear 41 by cutting (the entirety of the first coupling member is formed by cutting), the number of cut portions and the processing time can be reduced. As a result, material costs and machining costs can be reduced.
In the first coupling member 42 and the parking gear 41, the inner peripheral surface of the flange portion 422 of the first coupling member 42 and the outer peripheral surface of the annular portion 412 of the parking gear 41 are fixed to each other by welding in a state where the flange portion 422 of the first coupling member 42 and the stepped portion 415 are in contact with each other in the axial direction. Therefore, the positioning and welding of the first coupling member 42 and the parking gear 41 in the axial direction can be easily performed.
Further, since the second coupling member 43 of the drum portion 40 is formed separately from the parking gear 41, the second coupling member 43 may be formed as a press-worked member by press working, and if necessary, the outer peripheral surface of the free end portion of the outer tube portion 432 (the portion to be welded to the flange portion 413 of the parking gear 41) and the inner peripheral surface of the free end portion of the inner tube portion 433 (the portion to be welded to the flange portion 272 of the output member 27) may be cut. Thus, compared to a case where the second coupling member 43 is integrally formed with the parking gear 41 by cutting (the entirety of the parking gear is formed by cutting), the number of cut portions and the processing time can be reduced. As a result, material costs and machining costs can be reduced.
Further, since a gap communicating the inside and outside of the drum portion 40 in the radial direction is formed between the end surface of the ring gear 37 on the first coupling member 42 side in the axial direction and the two adjacent teeth of the comb-tooth portion 423, the gap can be made to function as an oil hole through which the working oil passes. As a result, the number of manufacturing steps can be reduced as compared with a case where the oil hole is separately provided.
Further, since the outer cylinder 432 and the inner cylinder 433 of the second coupling member 43 extend from the annular portion 431 to the same side in the axial direction, the second coupling member 43 having a short axis and, further, the drum 40 having a short axis can be realized.
The drum portion 40 is manufactured, for example, as follows. Fig. 5 is a process diagram illustrating a manufacturing process of the drum 40, and fig. 6 is an explanatory diagram illustrating a manufacturing process of the drum 40. Hereinafter, a manufacturing process of the drum unit 40 of fig. 5 will be described with reference to fig. 6.
First, as shown in fig. 6a, the bottomed tubular member 40A including the portions to be the first coupling member 42 and the second coupling member 43 is integrally formed by press working (step S100), and the parking gear 41 is formed separately from the bottomed tubular member 40A by forging, quenching, and cutting (step S110). The bottomed tubular member 40A has: an annular outer annular portion 401A, an outer cylindrical portion 402A extending cylindrically in the axial direction from the outer periphery of the outer annular portion 401A, an intermediate cylindrical portion 403A extending cylindrically in the axial direction from the inner periphery of the outer annular portion 401A to the side opposite to the outer cylindrical portion 402A, an inner annular portion 404A extending radially inward from the end of the intermediate cylindrical portion 403A on the side opposite to the outer annular portion 401A, and an inner cylindrical portion 405A extending axially from the inner periphery of the inner annular portion 404A to the side of the outer cylindrical portion 402A.
Next, the comb teeth are formed on the free end of the bottomed tubular member 40A by cutting (step S120). Then, by punching or cutting the bottomed tubular member 40A, unnecessary portions (hatched portions in fig. 6 a) are removed from the outer annular portion 401A and the middle tubular portion 403A of the bottomed tubular member 40A, thereby forming the first coupling member 42 and the second coupling member 43 (step S130). In step S130, the outer peripheral portions of the outer cylinder 402A and the outer ring 401A of the bottomed tubular member 40A serve as the tubular portion 421 and the flange portion 422 of the first coupling member 42, and the inner ring 404A, the middle cylinder 403A, and the inner cylinder 405A of the bottomed tubular member 40A serve as the annular portion 431, the outer cylinder 432, and the inner cylinder 433 of the second coupling member 43.
Then, as shown in fig. 6B, the first coupling member 42 and the second coupling member 43 are fixed to the parking gear 41 by welding (step S140), and the drum portion 40 is completed. The step S130 is performed as follows. The inner peripheral surface of the flange portion 422 of the first coupling member 42 and the outer peripheral surface of the annular portion 412 of the parking gear 41 are fixed by welding in a state where the flange portion 422 of the first coupling member 42 and the first stepped portion 415 of the parking gear 41 are brought into contact in the axial direction. In addition, the outer peripheral surface of the free end portion of the outer cylinder portion 432 of the second coupling member 43 and the inner peripheral surface of the flange portion 413 of the parking gear 41B are fixed by welding in a state where the outer peripheral surface of the free end portion of the outer cylinder portion 432 and the inner peripheral surface of the flange portion 413 are aligned in the axial direction.
In the embodiment, the first connecting member 42 and the second connecting member 43 can be formed by press working, so-called double cutting, by forming the first connecting member 42 and the second connecting member 43 by removing unnecessary portions after forming the bottomed tubular member 40A, based on the fact that the outer diameter of the outer cylindrical portion 432 of the second connecting member 43 is smaller than the inner diameter of the flange portion 422 of the first connecting member 42. As a result, the base material can be effectively used, and the time required for forming the first connecting member 42 and the second connecting member 43 can be further shortened, as compared with the case where the first connecting member 42 and the second connecting member 43 are formed by press working, respectively.
Further, in a state where the flange portion 422 of the first coupling member 42 is brought into contact with the first stepped portion 415 of the parking gear 41 in the axial direction, the inner peripheral surface of the flange portion 422 of the first coupling member 42 and the outer peripheral surface of the annular portion 412B of the parking gear 41 are fixed by welding, and therefore, positioning and welding in the axial direction of the first coupling member 42B and the parking gear 41B can be easily performed.
In the embodiment, the first coupling member 42 is formed separately from the ring gear 37 and the parking gear 41, and the parking gear 41 is formed separately from the second coupling member 43, but at least the parking gear 41 may be formed separately from the second coupling member 43, or the first coupling member 42 and the ring gear 37 may be integrally molded.
In the embodiment, the drum portion 40 couples the ring gear 37 of the second planetary gear mechanism 35 and the output member 27, but a carrier of the planetary gear mechanism or the like may be coupled to the output member in accordance with the mode of the automatic transmission 25.
In the embodiment, the spline 37a formed on the outer peripheral surface of the ring gear 37 of the second planetary gear mechanism 35 is fitted to the comb portion 423 formed at the end portion of the drum portion 40 in the axial direction of the first coupling member 42, but the spline 37a formed on the outer peripheral surface of the ring gear 37 may be fitted to the spline formed on the inner peripheral surface of the first coupling member 42.
In the embodiment, the gap communicating the inside and the outside of the drum portion 40 in the radial direction is formed between the end surface of the ring gear 37 on the first coupling member 42 side in the axial direction and the adjacent two teeth of the comb tooth portion 423. In this case, oil holes that communicate the inside and outside of the drum 40 in the radial direction may be formed in the first coupling member 42.
In the embodiment, the parking gear 41 and the first coupling member 42 are joined by welding, and the parking gear 41 and the second coupling member 43 are joined by welding, but the parking gear 41 and the first coupling member 42 may be connected by spline fitting or the like as long as the parking gear 41 and the second coupling member 43 are joined.
In the embodiment, the first coupling member 42 and the second coupling member 43 are formed by press working, so-called double cutting, but may be formed by press working separately. In this case, the outer diameter of the outer cylinder 432 may be substantially equal to or larger than the inner diameter of the flange 422 of the first coupling member 42. The first coupling member 42 may not be a press-formed member, and may be a forged member, a machined member formed by cutting, or the like.
In the embodiment, the second coupling member 43 has the annular portion 431, the outer tube portion 432, and the inner tube portion 433, but is not limited to such a shape, and may not have the outer tube portion 432 and the inner tube portion 433.
Fig. 7 is a partial sectional view showing the periphery of a drum portion 40B according to another embodiment. In fig. 7, the output member 27 and the ring gear 37 of the second planetary gear mechanism 35 are the same as those in fig. 4. The drum portion 40B includes a parking gear 41B of the parking device, a first coupling member 42B coupled to the ring gear 37 and connected (fixed) to the parking gear 41B, and a second coupling member 43B connected (fixed) to the parking gear 41B and the output member 27, similarly to the drum portion 40 shown in fig. 4.
The parking gear 41B is a forged part formed by, for example, forging, quenching, and cutting, and includes: a cylindrical gear portion 411B having a plurality of external teeth; an annular ring portion 412B extending in the axial direction from one axial end (left end in fig. 7) of the inner peripheral portion of the gear portion 411B; and annular flange portions 413B, 414B extending in two stages radially inward from the other end portion (right end portion in fig. 7) of the gear portion 411B in the axial direction. In the parking gear 41B, a first stepped portion 415B is formed by one end surface (left end surface in fig. 7) of the gear portion 411B in the axial direction and the outer peripheral surface of the annular portion 412B. The flange 414B is formed on the opposite side of the annular portion 412B from the flange 413B. In the parking gear 41B, a second stepped portion 416B is formed by an inner peripheral surface of the flange portion 413B and one end surface (left end surface in fig. 7) in the axial direction of the flange portion 414B.
The first connecting member 42B is a press-formed member formed substantially by press working, and includes a cylindrical portion 421B and an annular flange portion 422B extending radially inward from one end portion (right end portion in fig. 4) in the axial direction of the cylindrical portion 421B. In the flange portion 422B, an inner peripheral surface of the flange portion 422B is fixed to an outer peripheral surface of the annular portion 412B of the parking gear 41B by welding in a state where the flange portion 422B is in contact with the first stepped portion 415B in the axial direction (a state where an end surface of the flange portion 422B in the axial direction and an end surface of the gear portion 411B of the parking gear 41B in the axial direction are in contact with each other). Therefore, the inner peripheral surface of the flange portion 422B and the outer peripheral surface of the annular portion 412B of the parking gear 41B are connected via a welded portion (a joint portion formed by welding).
A spline 423B is formed at the other end portion of the cylindrical portion 421B in the axial direction, and a recess 424B recessed outward in the radial direction is formed on the inner circumferential surface of the spline 423B. In this embodiment, the spline 423B is formed by press working. The ring gear 37 of the second planetary gear mechanism 35 and the first coupling member 42B are coupled to each other by a spline 37a formed on the outer peripheral surface of the ring gear 37 being fitted to a spline 423B of the first coupling member 42B and by a snap ring 50 being interposed between an annular concave portion 37B of the spline 37a and a concave portion 424B of the spline 423B.
The second coupling member 43B is a press-formed member formed substantially by press working, and includes an annular portion 431B and a truncated conical portion 433B extending from the inner periphery of the annular portion 431 to the second planetary gear 35 side (left side in fig. 7) in the axial direction. The outer diameter of the annular portion 431B is designed to be smaller than the inner diameter of the flange portion 422B of the first coupling member 42B. In the annular portion 431B, in a state where the annular portion 431B and the second stepped portion 416B are in contact in the axial direction (a state where an end surface in the axial direction of the annular portion 431B and an end surface in the axial direction of the flange portion 414B of the parking gear 41B are in contact with each other), an outer peripheral surface of the annular portion 431B is fixed to an inner peripheral surface of the flange portion 413B of the parking gear 41B by welding. The inner peripheral surface of the free end portion of the conical table portion 433B is fixed to the outer peripheral surface of the flange portion 272 of the output member 27 by welding. Therefore, the outer peripheral surface of the annular portion 431B and the inner peripheral surface of the flange portion 413B of the parking gear 41B are connected via a welded portion, and the inner peripheral surface of the free end portion of the conical table portion 433B and the outer peripheral surface of the flange portion 272 of the output member 27 are connected via a welded portion.
In this embodiment, since the first coupling member 42B of the drum portion 40B is formed separately from the ring gear 37 and the parking gear 41B of the second planetary gear mechanism 35, the first coupling member 42B is formed as a press-formed member by press working, the spline 423B is formed by press working at the free end portion (the portion to be fitted to the ring gear 37) of the cylindrical portion 421B, and the inner peripheral surface of the flange portion 422B (the portion to be welded to the annular portion 412B of the parking gear 41B) may be cut as necessary. Thus, compared to the case where the first coupling member 42B is integrally formed with the ring gear 37 and the parking gear 41B by cutting (the entirety of which is formed by cutting), the cutting portion and the processing time can be reduced. As a result, material costs and machining costs can be reduced.
Further, in the first coupling member 42B and the parking gear 41B, the inner peripheral surface of the flange portion 422B of the first coupling member 42B and the outer peripheral surface of the annular portion 412B of the parking gear 41B are fixed to each other by welding in a state where the flange portion 422B of the first coupling member 42B and the first stepped portion 415B of the parking gear 41B are in axial contact with each other. Therefore, the first coupling member 42B and the parking gear 41B can be easily positioned and welded in the axial direction.
Further, since the second coupling member 43B of the drum portion 40B is formed separately from the parking gear 41B, the second coupling member 43B may be formed as a press-worked member by press working, and the outer peripheral surface of the annular portion 431B (the portion to be welded to the flange portion 413B of the parking gear 41B) and the inner peripheral surface of the free end portion of the conical table portion 433B (the portion to be welded to the flange portion 272 of the output member 27) may be cut as necessary. Thus, compared to a case where the second coupling member 43B is integrally formed with the parking gear 41B by cutting (the entirety thereof is formed by cutting), the cutting portion and the processing time can be reduced. As a result, material costs and machining costs can be reduced.
In the second coupling member 43B and the parking gear 41B, the outer peripheral surface of the annular portion 431B of the second coupling member 43B and the inner peripheral surface of the flange portion 413B of the parking gear 41B are fixed to each other by welding in a state where the annular portion 431B of the second coupling member 43B and the second stepped portion 416B of the parking gear 41B are in axial contact with each other. Therefore, the second coupling member 43B and the parking gear 41B can be easily positioned and welded in the axial direction.
The drum portion 40B is manufactured, for example, as follows. Fig. 8 is a process diagram illustrating a manufacturing process of the drum portion 40B, and fig. 9 is an explanatory diagram illustrating a manufacturing process of the drum portion 40B. Hereinafter, a manufacturing process of the drum portion 40B of fig. 8 will be described with reference to fig. 9.
First, as shown in fig. 9 a, a bottomed tubular member 40C including portions to be the first coupling member 42B and the second coupling member 43B is integrally formed by press working (step S200), and the parking gear 41 is formed separately from the bottomed tubular member 40C by forging, quenching, and cutting (step S210). As shown in fig. 9 (a), the bottomed tubular member 40C has an annular bottom portion 401C, a tubular portion 402C extending cylindrically in the axial direction from the outer periphery of the bottom portion 401C, and a frustum portion 403C extending frustoconically on the same side as the tubular portion 402C in the axial direction from the inner periphery of the annular bottom portion 401C.
Next, as shown in fig. 9 (B), a spline 404C is formed at the free end portion of the cylindrical portion 402C of the bottomed cylindrical member 40C by press working (step S220). Then, the bottomed tubular member 40C is subjected to punching processing to remove an annular unnecessary portion (hatched portion in fig. 9B) from the bottom portion 401C of the bottomed tubular member 40C, thereby forming the first coupling member 42B and the second coupling member 43B as shown in fig. 9C (step S230). In this step S230, the cylindrical portion 402C (including the splines 404C) and the outer peripheral portion of the bottom portion 401C of the bottomed cylindrical member 40C become the cylindrical portion 421B (including the splines 423B) and the flange portion 422B of the first coupling member 42B, and the inner peripheral portion and the frustum portion 403C of the bottom portion 401C of the bottomed cylindrical member 40C become the annular portion 431B and the frustum portion 433B of the second coupling member 43B. The bottomed tubular member 40C has a bottom portion 401C, and the first coupling member 42B and the second coupling member 43B are formed by removing an annular unnecessary portion from the bottom portion 401C.
Then, as shown in fig. 9D, the first coupling member 42B and the second coupling member 43B are fixed to the parking gear 41B by welding (step S240), thereby completing the manufacture of the drum portion 40. Step S240 is performed as follows. The inner peripheral surface of the flange portion 422B of the first coupling member 42B and the outer peripheral surface of the annular portion 412B of the parking gear 41B are fixed by welding in a state where the flange portion 422B of the first coupling member 42B is brought into contact with the first stepped portion 415B of the parking gear 41B in the axial direction. In addition, the outer peripheral surface of the annular portion 431B of the second coupling member 43B and the inner peripheral surface of the flange portion 413B of the parking gear 41B are fixed by welding in a state where the annular portion 431B of the second coupling member 43B and the second stepped portion 416B of the parking gear 41B are brought into contact in the axial direction.
In this embodiment, the first connecting member 42B and the second connecting member 43B are formed by removing unnecessary portions after the bottomed tubular member 40C is formed, based on the fact that the outer diameter of the annular portion 431B of the second connecting member 43B is smaller than the inner diameter of the flange portion 422B of the first connecting member 42B, and the first connecting member 42B and the second connecting member 43B can be formed by press working, so-called double cutting. As a result, the base material can be effectively used, and the time required for forming the first coupling member 42B and the second coupling member 43B can be further shortened, as compared with the case where the first coupling member 42B and the second coupling member 43B are formed by press working, respectively. Further, since the spline 423B of the first coupling member 42B is formed by press working, the working can be performed more easily than the case where the comb tooth portion 423 of the first coupling member 42 is formed by cutting.
Further, in a state where the flange portion 422B of the first coupling member 42B and the first stepped portion 415B of the parking gear 41B are brought into contact in the axial direction, the inner peripheral surface of the flange portion 422B of the first coupling member 42B and the outer peripheral surface of the annular portion 412B of the parking gear 41B are fixed by welding, and therefore, positioning and welding in the axial direction of the first coupling member 42B and the parking gear 41B can be easily performed. Similarly, in a state where the annular portion 431B of the second coupling member 43B and the second stepped portion 416B of the parking gear 41B are brought into contact with each other in the axial direction, the outer peripheral surface of the annular portion 431B of the second coupling member 43B and the inner peripheral surface of the flange portion 413B of the parking gear 41B are fixed by welding, and therefore, positioning and welding in the axial direction of the second coupling member 43B and the parking gear 41B can be easily performed.
In this embodiment, the first coupling member 42B is formed separately from the ring gear 37 and the parking gear 41B, and the parking gear 41B is formed separately from the second coupling member 43B, but at least the parking gear 41B and the second coupling member 43B may be formed separately, and the first coupling member 42B and the ring gear 37 may be integrally formed.
In this embodiment, the drum portion 40B couples the ring gear 37 of the second planetary gear mechanism 35 and the output member 27, but depending on the mode of the automatic transmission 25, a carrier of the planetary gear mechanism or the like may be coupled to the output member.
In this embodiment, the parking gear 41B and the first coupling member 42B are joined by welding, and the parking gear 41B and the second coupling member 43B are joined by welding, but the parking gear 41B and the first coupling member 42B may be connected by spline fitting or the like as long as the parking gear 41B and the second coupling member 43B are joined.
In this embodiment, the first connecting member 42B and the second connecting member 43B are formed by press working, so-called double cutting, but may be formed by press working separately. In this case, the outer diameter of the annular portion 431B may be substantially equal to or larger than the inner diameter of the flange portion 422B of the first coupling member 42B. The first coupling member 42B may not be a press-formed member, and may be a forged member, a machined member formed by cutting, or the like.
As described above, the method for manufacturing a drum portion of a power transmission device according to the present invention includes a transmission (25) that shifts a speed of power input to an input member (26) and transmits the power to an output member (27), the transmission (25) includes drum portions (40, 40B) having a bottomed tubular shape, the drum portions (40, 40B) being connected to an intermediate member (37) and the output member (27) in a power transmission path from the input member (26) to the output member (27), the drum portions (40, 40B) including parking gears (41, 41B) of a parking device, first coupling members (42, 42B) connected to the intermediate member (37) and the parking gears (41, 41B), and second coupling members (43, 43) connected to the parking gears (41, 41B) and the output member (27) via coupling portions, respectively, 43B) Wherein the method of manufacturing the drum portion of the power transmission device includes: a step (a) of forming the first coupling members (42, 42B), forming the second coupling members (43, 43B) by press working, and forming the parking gears (41, 41B); and a step (B) of joining the parking gears (41, 41B) and the second coupling members (43, 43B), and connecting the parking gears (41, 41B) and the first coupling members (42, 42B).
In the method of manufacturing the drum portion of the power transmission device of the present invention, the first coupling member is formed, the second coupling member is formed along with the press working, the parking gear is formed, the parking gear is joined to the second coupling member, and the parking gear is connected to the first coupling member. Thus, the second coupling member and the parking gear can be formed separately by press working (if necessary, the portion of the second coupling member to be joined to the parking gear or the output member may be cut). Therefore, compared to the case where the second coupling member and the parking gear are integrally formed by cutting, the number of cut portions and the processing time when the second coupling member is formed can be reduced, and further the number of cut portions and the processing time when the drum portion is formed can be reduced. As a result, material costs and machining costs for forming the drum portion can be reduced.
In the method of manufacturing a drum portion of a power transmission device according to the present invention, the first coupling member (42, 42B) may be connected to the parking gear (41, 41B) via a joint portion, an inner diameter of the first coupling member (42, 42B) may be larger than an outer diameter of the second coupling member (43, 43B), and the step (a) may include: a step (a1) of integrally forming, by press working, bottomed tubular members (40A, 40C) including portions to be the first connecting members (42, 42B) and the second connecting members (43, 43B); and a step (a2) of forming the first coupling members (42, 42B) and the second coupling members (43, 43B) by removing unnecessary portions from portions of the bottomed tubular members (40A, 40C) that connect the first coupling members (42, 42B) and the second coupling members (43, 43B), wherein in the step (B), the first coupling members (42, 42B) and the second coupling members (43, 43B) are joined to the parking gears (41, 41B). In this way, the first coupling member and the second coupling member can be formed by press working called double cutting.
In this case, the bottomed tubular member (40C) may have an annular bottom portion (401C) and a tubular portion (402C) extending in the axial direction from the outer periphery of the bottom portion (401C), and in the step (a2), the first coupling member (42B) and the second coupling member (43B) may be formed by removing the annular unnecessary portion from the bottom portion (401C) of the bottomed tubular member (40C) by punching. The bottomed tubular member has a bottom portion, and the first coupling member and the second coupling member are formed by removing an annular unnecessary portion from the bottom portion, whereby punching can be easily performed.
In this case, the intermediate member (37) may be a ring gear (37) of a planetary gear mechanism (35), splines (37a) may be formed on an outer peripheral surface of the ring gear (37), the step (a) may further include a step (a3) after the step (a1), and in the step (a3), splines (423B) may be formed on a connection portion of the first connection member (42B) to the ring gear (37) by press working. In this way, machining can be performed more easily than in the case where the spline is formed by cutting or the like in the connecting portion of the first connecting member to the ring gear.
In the method of manufacturing a drum portion of a power transmission device according to the present invention, in the step (B), one end portion in the axial direction of the first coupling member (42, 42B) may be connected to the parking gear (41, 41B), and an outer peripheral portion of the second coupling member (43, 43B) may be joined to an inner peripheral portion of the parking gear (41, 41B).
In the method of manufacturing a drum portion of a power transmission device according to the present invention, the first coupling member (42, 42B) may be connected to the parking gear (41, 41B) via a joint portion, an end portion of the parking gear (41, 41B) on the first coupling member (42, 42B) side in the axial direction may have a first stepped portion (415, 415B), and in the step (B), the first coupling member (42, 42B) may be joined to the parking gear (41, 41B) in a state where the one end portion of the first coupling member (42, 42B) in the axial direction is brought into contact with the first stepped portion (415, 415B) of the parking gear (41, 41B) in the axial direction. In this way, the positioning and engagement of the first coupling member and the parking gear in the axial direction can be easily performed.
In the method of manufacturing a drum portion of a power transmission device according to the present invention, the parking gear (41B) may have a second stepped portion (416B) on an inner peripheral portion, and in the step (B), the second coupling member (43B) may be joined to the parking gear (41B) in a state where the outer peripheral portion of the second coupling member (43B) is brought into contact with the second stepped portion (416B) of the parking gear (41B) in the axial direction. In this way, the second coupling member and the parking gear can be easily positioned and engaged in the axial direction.
In the method of manufacturing a drum portion of a power transmission device according to the present invention, the joint portion may be a welded portion. In the step (a), the parking gears (41, 41B) may be formed by forging. In this case, in the step (a), the parking gear may be formed by forging, quenching, or cutting. The intermediate member (37) may be a ring gear (37) of a planetary gear mechanism (35).
A power transmission device (20) of the present invention is provided with a transmission (25), wherein the transmission (25) shifts the speed of power input to an input member (26) and transmits the power to an output member (27), the transmission (25) is provided with drum parts (40, 40B) with a bottom cylinder shape, the drum parts (40, 40B) are connected with an intermediate member (37) and the output member (27) in a power transmission path from the input member (27) to the output member (28), the drum parts (40, 40B) are provided with parking gears (41, 41B) of a parking device, first connecting members (42, 42B) connected with the intermediate member (37) and the parking gears (41, 41B), and second connecting members (43, 42B) as a punching workpiece respectively connected with the parking gears (41, 41B) and the output member (27) through joint parts, 43B) In that respect
In the power transmission device of the present invention, the transmission includes a drum portion having a bottomed tubular shape, the drum portion being connected to the intermediate member and the output member in a power transmission path from the input member to the output member, and the drum portion includes a parking gear of the parking device, a first coupling member connected to the intermediate member and the parking gear, and a second coupling member as a press-worked member connected to the parking gear and the output member via the joint portion, respectively. Thus, the second coupling member and the parking gear can be formed separately by press working (if necessary, the portion of the second coupling member to be joined to the parking gear or the output member may be cut). Therefore, compared to the case where the second coupling member and the parking gear are integrally formed by cutting, the number of cut portions and the processing time when the second coupling member is formed can be reduced, and further the number of cut portions and the processing time when the drum portion is formed can be reduced. As a result, material costs and machining costs for forming the drum portion can be reduced. Here, the joint may be a welded portion.
In the power transmission device according to the present invention, the first coupling member (42, 42B) may be connected to the parking gear (41, 41B) via a joint, and may be a press-formed member, and an inner diameter of the first coupling member (42, 42B) may be larger than an outer diameter of the second coupling member (43, 43B). In this way, the first coupling member and the second coupling member can be formed by press working called double cutting.
In the power transmission device of the present invention, the parking gear may be a forged member. In this case, the parking gear may be formed by forging, quenching, or cutting.
In the power transmission device of the present invention, one end portion in the axial direction of the first coupling member (42, 42B) may be connected to the parking gear (41, 41B), the other end portion in the axial direction of the first coupling member (42, 42B) may be connected to the intermediate member (37), the outer peripheral portion of the second coupling member (43, 43B) may be connected to the inner peripheral portion of the parking gear (41, 41B) via the joint portion, and the inner peripheral portion of the second coupling member (43, 43B) may be connected to the outer peripheral portion of the output member (28) via the joint portion.
In the power transmission device according to the present invention, the first coupling member (42, 42B) may be connected to the parking gear (41, 41B) via an engagement portion, an end portion of the parking gear (41, 41B) on the first coupling member (42, 42B) side in the axial direction may have a first stepped portion (415, 415B), and one end portion of the first coupling member (42, 42B) in the axial direction may be connected to the parking gear (41, 41B) via the engagement portion in a state of being in contact with the first stepped portion (415, 415B) of the parking gear (41, 41B) in the axial direction.
In the power transmission device of the present invention, the parking gear (41B) may have a second stepped portion (416B) on an inner peripheral portion thereof, and an outer peripheral portion of the second coupling member (43B) may be connected to the parking gear (41B) via the joint portion in a state of being in contact with the second stepped portion (416B) of the parking gear (41B) in the axial direction.
In the power transmission device of the present invention, the intermediate member (37) may be a ring gear (37) of a planetary gear mechanism (35). In this way, the first coupling member can be formed by press working separately from the parking gear and the ring gear (if necessary, the portion of the first coupling member to be joined to the parking gear and the ring gear may be cut). Therefore, compared to the case where the first coupling member and the ring gear are integrally formed by cutting, the cutting portion and the machining time can be reduced when the first coupling member is formed, and further the cutting portion and the machining time can be further reduced when the drum portion is formed.
In the power transmission device of the present invention, the intermediate member (37) may be a ring gear (37) of a planetary gear mechanism (35), a spline (37a) may be formed on an outer peripheral surface of the ring gear (37), a comb-tooth-shaped comb tooth portion (423) that is fitted to the spline (37a) may be formed on the ring gear-side end portion of the first coupling member (42), and a gap that communicates the inside and the outside of the drum portion (40) may be formed between the first coupling member (42) -side end surface of the ring gear (37) and two adjacent teeth of the comb tooth portion (423). In this way, the gap can function as an oil hole through which the working oil passes. As a result, the number of manufacturing steps can be reduced as compared with a case where the oil hole is separately provided.
In the power transmission device according to the present invention, the intermediate member (37) may be a ring gear (37) of a planetary gear mechanism (35), a gear-side spline (37a) may be formed on an outer peripheral surface of the ring gear (37), and a member-side spline (423B) that is fitted to the gear-side spline (37a) may be formed on an end portion of the first coupling member (42B) on the ring gear (37) side.
While the embodiment for carrying out the present invention has been described above, the present invention is not limited to the embodiment, and can be carried out in various forms without departing from the scope of the present invention.
Industrial applicability of the invention
The present invention can be used in the manufacturing industry of power transmission devices and the like.
Claims (14)
1. A method of manufacturing a drum of a power transmission device,
the power transmission device includes a transmission that changes a speed of power input to an input member and transmits the power to an output member,
the transmission includes a drum portion having a bottomed tubular shape, the drum portion being connected to the output member and an intermediate member in a power transmission path from the input member to the output member,
the drum portion has a parking gear of a parking device, a first coupling member connected to the intermediate member and the parking gear, and a second coupling member connected to the parking gear and the output member via a joint portion, respectively,
the method for manufacturing the drum part of the power transmission device comprises the following steps:
a step (a) of forming the first coupling member, forming the second coupling member with press working, and forming the parking gear; and
and (b) joining the parking gear to the second coupling member and connecting the parking gear to the first coupling member.
2. The method of manufacturing a drum portion for a power transmission device according to claim 1,
the first coupling member is coupled with the parking gear via an engagement portion,
the inner diameter of the first coupling member is larger than the outer diameter of the second coupling member,
the step (a) comprises:
a step (a1) of integrally forming a bottomed tubular member including portions to be the first coupling member and the second coupling member by press working; and
a step (a2) of removing an unnecessary portion from a portion of the bottomed tubular member that connects the first connecting member and the second connecting member to form the first connecting member and the second connecting member,
in the step (b), the first coupling member and the second coupling member are engaged with the parking gear.
3. The method of manufacturing a drum portion for a power transmission device according to claim 2,
the bottomed tubular member has an annular bottom portion and a tubular portion extending in an axial direction from an outer periphery of the bottom portion,
in the step (a2), the first coupling member and the second coupling member are formed by removing the annular unnecessary portion from the bottom portion of the bottomed tubular member by punching.
4. The method of manufacturing a drum portion of a power transmission device according to claim 2 or 3,
the intermediate member is a ring gear of the planetary gear mechanism,
a spline is formed on an outer peripheral surface of the ring gear,
the step (a) further includes a step (a3) after the step (a1), and in the step (a3), a spline is formed by press working at a connecting portion of the first coupling member to the ring gear.
5. The method of manufacturing a drum portion of a power transmission device according to any one of claims 1 to 4,
in the step (b), one end portion of the first coupling member in the axial direction is connected to the parking gear, and an outer peripheral portion of the second coupling member is joined to an inner peripheral portion of the parking gear.
6. The method of manufacturing a drum portion of a power transmission device according to any one of claims 1 to 5,
the first coupling member is coupled with the parking gear via an engagement portion,
the parking gear has a first stepped portion at an end portion on the first coupling member side in the axial direction,
in the step (b), the first coupling member is engaged with the parking gear in a state where one end portion of the first coupling member in the axial direction is brought into contact with the first stepped portion of the parking gear in the axial direction.
7. The method of manufacturing a drum portion of a power transmission device according to any one of claims 1 to 6,
the parking gear has a second stepped portion on an inner peripheral portion,
in the step (b), the second coupling member is engaged with the parking gear in a state where the outer peripheral portion of the second coupling member is brought into contact with the second stepped portion of the parking gear in the axial direction.
8. A power transmission device having a transmission for shifting power input to an input member and transmitting the power to an output member,
the transmission includes a drum portion having a bottomed tubular shape, the drum portion being connected to the output member and an intermediate member in a power transmission path from the input member to the output member,
the drum portion has a parking gear of a parking device, a first coupling member connected to the intermediate member and the parking gear, and a second coupling member as a press-worked member connected to the parking gear and the output member via joint portions, respectively.
9. The power transmission device according to claim 8,
the first coupling member is coupled with the parking gear via a joint portion, and is a press-worked member,
the inner diameter of the first coupling member is larger than the outer diameter of the second coupling member.
10. The power transmission device according to claim 8 or 9,
one end portion of the first coupling member in the axial direction is connected to the parking gear,
the other end portion in the axial direction of the first linking member is connected to the intermediate member,
an outer peripheral portion of the second coupling member is connected to an inner peripheral portion of the parking gear via the engagement portion,
an inner peripheral portion of the second coupling member is connected to an outer peripheral portion of the output member via the joint portion.
11. The power transmission device according to any one of claims 8 to 10,
the first coupling member is coupled with the parking gear via an engagement portion,
the parking gear has a first stepped portion at an end portion on the first coupling member side in the axial direction,
one end portion of the first coupling member in the axial direction is connected to the parking gear via the engagement portion in a state of being in contact with the first stepped portion of the parking gear in the axial direction.
12. The power transmission device according to any one of claims 8 to 11,
the parking gear has a second stepped portion on an inner peripheral portion,
the outer peripheral portion of the second coupling member is connected to the parking gear via the engagement portion in a state of being in contact with the second stepped portion of the parking gear in the axial direction.
13. The power transmission device according to any one of claims 8 to 12,
the intermediate member is a ring gear of the planetary gear mechanism,
a spline is formed on an outer peripheral surface of the ring gear,
a comb-tooth portion having a comb-tooth shape to be fitted to the spline is formed at an end portion of the first coupling member on the ring gear side,
a gap for communicating the inside and outside of the drum portion is formed between the end surface of the ring gear on the first coupling member side and two adjacent teeth of the comb-teeth portion.
14. The power transmission device according to any one of claims 8 to 12,
the intermediate member is a ring gear of the planetary gear mechanism,
a gear-side spline is formed on an outer peripheral surface of the ring gear,
a member-side spline that is fitted to the gear-side spline is formed at the ring gear-side end of the first coupling member.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-059796 | 2019-03-27 | ||
| JP2019059796 | 2019-03-27 | ||
| JP2020033318A JP2020165532A (en) | 2019-03-27 | 2020-02-28 | Manufacturing method of drum portion of power transmission device, and power transmission device |
| JP2020-033318 | 2020-02-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111750071A true CN111750071A (en) | 2020-10-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010210540.8A Pending CN111750071A (en) | 2019-03-27 | 2020-03-23 | Method for manufacturing drum of power transmission device and power transmission device |
Country Status (1)
| Country | Link |
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| CN (1) | CN111750071A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002130329A (en) * | 2000-10-27 | 2002-05-09 | Aisin Aw Co Ltd | Automatic transmission |
| US20040045389A1 (en) * | 2002-05-03 | 2004-03-11 | Pascoe David Mark | Rotating housing and gear assembly |
| JP2008185090A (en) * | 2007-01-29 | 2008-08-14 | Aisin Seiki Co Ltd | Automatic transmission |
| DE102009045243A1 (en) * | 2008-10-03 | 2010-04-08 | Ford Motor Company, Dearborn | One-piece ring gear parking brake drum |
| JP2013155850A (en) * | 2012-01-31 | 2013-08-15 | Aisin Aw Co Ltd | Band brake device |
-
2020
- 2020-03-23 CN CN202010210540.8A patent/CN111750071A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002130329A (en) * | 2000-10-27 | 2002-05-09 | Aisin Aw Co Ltd | Automatic transmission |
| US20040045389A1 (en) * | 2002-05-03 | 2004-03-11 | Pascoe David Mark | Rotating housing and gear assembly |
| JP2008185090A (en) * | 2007-01-29 | 2008-08-14 | Aisin Seiki Co Ltd | Automatic transmission |
| DE102009045243A1 (en) * | 2008-10-03 | 2010-04-08 | Ford Motor Company, Dearborn | One-piece ring gear parking brake drum |
| US20100083780A1 (en) * | 2008-10-03 | 2010-04-08 | Joseph Szuba | One piece ring gear-park brake drum |
| JP2013155850A (en) * | 2012-01-31 | 2013-08-15 | Aisin Aw Co Ltd | Band brake device |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20220208 Address after: Aichi Applicant after: AISIN Co.,Ltd. Address before: Aichi Applicant before: AISIN AW Co.,Ltd. |