JP5095559B2 - Drive plate connection structure - Google Patents

Description

  The present invention relates to a drive plate connection structure, and more particularly to a drive plate connection structure that reduces membrane vibrations of the drive plate that occur during cranking.

  Conventionally, a drive plate is used to transmit engine driving force to a torque converter of an automatic transmission. That is, the inner diameter part of the drive plate is fastened to the crankshaft of the engine with bolts, and the outer diameter part is fastened to the case of the torque converter with bolts. A ring gear that meshes with the starter motor gear is provided on the outer periphery of the drive plate.

  When starting the engine (cranking), the ring gear is driven by the starter motor and the drive plate is rotated. However, a membrane vibration is generated by the torque applied to the drive plate during the cranking, and the cranking sound reverberates due to this membrane vibration. There is a problem.

Therefore, in the drive plate where the ring gear is welded to the outer periphery of the web portion of the drive plate at a plurality of locations, the starter pinion gear is at least near the compression top dead center of each cylinder of the engine where the maximum load is applied to the ring gear. Has been proposed (for example, Patent Document 1).
Japanese Patent Laid-Open No. 4-15352

  However, the conventional structure aims to reduce the noise caused by the excitation force that increases due to the deterioration of the meshing caused by the load deformation of the ring gear support, and generates a cranking sound rather than a slight increase or decrease in the excitation force. There is a problem that the generation of the membrane vibration of the drive plate, which has a great influence on the vibration, is not considered.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a drive plate coupling structure that can effectively reduce membrane vibrations of the drive plate that occur when the engine is started.

  In order to achieve the above object, the drive plate coupling structure according to the first aspect of the present invention is characterized in that a drive plate having a ring gear meshing with a starter motor gear on an outer peripheral portion is provided on each of a plurality of mounting portions provided on a torque converter. A drive plate connecting structure for connecting an engine crankshaft and a torque converter by attaching a penetrating member that passes through the drive plate, wherein the drive plate is connected to the starter motor gear on the outer peripheral side of the drive plate. A hole is formed in an angle range corresponding to an angle range from a crankshaft rotation angle at which torque transmission is started to a crankshaft rotation angle at which torque transmission is ended to the ring gear. The mounting portion is provided at a portion of the torque converter, and the penetrating member passes through the hole. Attached to serial mounting portion, characterized by connecting the crankshaft and the torque converter of the engine.

  According to the drive plate coupling structure of the first aspect of the present invention, the torque is determined from the crankshaft rotation angle at which the transmission of torque from the starter motor gear provided on the outer peripheral portion to the ring gear is started. A hole is formed in an angle range region corresponding to an angle range up to the crankshaft rotation angle at which transmission of the torque is finished, and a mounting portion is provided in a portion of the torque converter corresponding to the hole, and the penetrating through the drive plate The member is attached to the attachment portion through a hole drilled in the angle range region, and the crankshaft of the engine and the torque converter are connected. In the prior art, when the engine is started, membrane vibration occurs in the drive plate with the torque converter mounting part and the crankshaft mounting part as fixed ends. In this way, the torque converter mounting area is where torque is transmitted from the starter motor gear to the ring gear. By using the portion, the torque is transmitted to the fixed end where the membrane vibration is difficult to be excited, and the membrane vibration of the drive plate can be reduced.

  Further, the angle range region is an angle range from an angle larger than a crankshaft rotation angle at which torque transmission is started from the starter motor gear to the ring gear to a crankshaft rotation angle at which the torque transmission is ended. It can be a corresponding area.

  In addition, the hole is formed in the circumferential center of the drive plate in the angular range region, or the transmission of the torque is terminated from the circumferential central portion of the drive plate in the angular range region. It can be drilled on the side corresponding to the shaft rotation angle. When the vibration of the drive plate is greatly attenuated, it is preferable to make a hole in the central portion in the circumferential direction. When the attenuation is small, the hole is formed on the side corresponding to the crankshaft rotation angle at which torque transmission is terminated. It is preferable to drill.

In the drive plate coupling structure of the second invention, a drive plate having a ring gear meshing with a starter motor gear is provided on the outer peripheral portion, and the drive plate is passed through each of a plurality of mounting portions provided in the torque converter. A drive plate connecting structure for connecting an engine crankshaft and a torque converter, wherein the torque is transmitted from the starter motor gear to the ring gear. The mounting portion is provided at a portion of the torque converter corresponding to an angle range region corresponding to an angle range from a rotation angle of the crankshaft at which rotation is started to a rotation angle of the crankshaft at which transmission of the torque is ended, and the angle the holes drilled in the circumferential direction central portion of the drive plate in the range area, before The penetrating member is attached to the attachment portion by penetrating the hole, characterized by connecting the crankshaft and the torque converter of the engine.

According to the drive plate coupling structure of the second aspect of the present invention, the torque is determined from the crankshaft rotation angle at which the transmission of torque from the starter motor gear provided on the outer peripheral portion to the ring gear is started. A mounting portion is provided at a portion of the torque converter corresponding to the angular range region up to the crankshaft rotation angle at which transmission of the transmission is terminated, and a hole is formed in the circumferential center portion of the drive plate in the angular range region , Is attached to the mounting portion through the hole to connect the crankshaft of the engine and the torque converter. In the prior art, when the engine is started, membrane vibration occurs in the drive plate with the torque converter mounting part and the crankshaft mounting part as fixed ends. In this way, the torque converter mounting area is where torque is transmitted from the starter motor gear to the ring gear. By using the portion, the torque is transmitted to the fixed end where the membrane vibration is difficult to be excited, and the membrane vibration of the drive plate can be reduced.

  Further, the mounting portion extends from the crankshaft rotation angle at which torque transmission is started from the starter motor gear to the ring gear along the circumferential direction of the drive plate from the crankshaft rotation angle at which transmission of torque is terminated. Can be provided over a range of angles. By providing the mounting portion over the angular range where torque is transmitted from the starter motor gear to the ring gear, all the vibration generated by the meshing of the starter motor gear and the ring gear is input to the mounting portion which is the fixed end of the membrane vibration. The membrane vibration of the drive plate can be effectively reduced.

  As described above, according to the drive plate coupling structure of the present invention, it is possible to effectively reduce the membrane vibration of the drive plate that occurs when the engine is started.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a first embodiment of a drive plate coupling structure of the present invention. The drive plate 1 is a one-piece type drive plate, and includes a web portion 1a and a ring gear portion 1b integrally formed on the outer peripheral portion of the web portion 1a. A plurality of crankshaft mounting holes 2 for fastening with bolts 11 to the crankshaft 10 of the engine are formed in the vicinity of the inner diameter portion of the web portion 1a (total of six in this embodiment) along the circumferential direction. A plurality of torque converter mounting holes 3 for fastening with bolts 22 to the set block 21 of the torque converter 20 are provided in the vicinity of the outer periphery in a region corresponding to a torque load angle range to be described later (in this embodiment). 3 in total).

  The set block 21 is welded to the torque converter 20 and has a size corresponding to the torque converter mounting hole 3 and the bolt 22.

  Further, a pinion gear 30 of the starter motor is disposed so as to mesh with the ring gear portion 1b of the drive plate 1. The pinion gear 30 is provided with a one-way clutch. When the engine is started, the drive plate 1 is rotated by driving the starter motor to rotate the pinion gear 30.

  Here, the position where the torque converter mounting hole 3 is drilled will be described. Since the position of the torque converter mounting hole 3 and the position of the set block 21 of the torque converter 20 correspond to each other, the position of the torque converter mounting hole 3 will be described here. Since it is the same, it abbreviate | omits.

  FIG. 2 shows the relationship between the crankshaft rotation angle and the rotation speeds of the ring gear portion 1b and the starter motor. As shown in FIG. 2, the rotational speed of the ring gear portion 1b is the slowest at the compression top dead center of the cylinder, and is the fastest at the approximate center of the adjacent compression top dead centers.

  On the other hand, the rotation speed of the starter motor is substantially the same as the rotation angle of the ring gear portion 1b from the point at which the ring gear rotation speed maximum position has passed the predetermined rotation angle to the compression top dead center. The rotation angle of the part 1b becomes faster, the starter motor slips due to the action of the one-way clutch, and does not coincide with the rotation angle of the ring gear part 1b. Then, the rotational angle of the ring gear portion 1b substantially coincides with the rotational angle of the ring gear portion 1b at a point where a predetermined rotational angle has passed again at the maximum position of the ring gear rotational speed. That is, the load from the pinion gear 30 to the ring gear portion 1b acts in a specific angle range from an angle (torque load start angle) rotated by a predetermined angle from the ring gear rotation speed maximum position to a compression top dead center (torque load end angle). I understand that. Hereinafter, this angle range is referred to as “torque load angle range β”. The torque load angle range β varies depending on the starter specifications (torque characteristics), engine specifications, gear specifications, and the like.

  Further, since the rotational speeds of the ring gear portion 1b and the starter motor change corresponding to the compression top dead center of the cylinder, the torque load angle equal to the number of cylinders during the period of two rotations of the crankshaft corresponding to one cycle of the engine. A range will occur. FIG. 2 shows the case of a three-cylinder engine.

  FIG. 3 shows a torque load angle range region corresponding to the torque load angle range β shown in FIG. The drive plate 1 rotates in the direction of arrow A. A torque converter attachment hole 3 is formed in a region on the outer peripheral side in the sector region surrounded by the outer peripheral portion indicated by the bold line and the center of the drive plate 1. A general expression of the position of the torque converter mounting hole 3 when the present embodiment is applied to an n-cylinder engine is expressed by Expression (1).

  α = 720 / n−β / m + γ (1)

  Here, α: hole position (angle in the counter-rotation direction of the drive plate rotation direction from the uppermost point of the drive plate 1 when compression top dead center), n: number of engine cylinders, β: torque load of the drive plate 1 Angle range, m: hole position adjustment parameter (m = 1: torque load start angle, m = ∞: torque load end angle), γ: pinion gear 30 mounting position (reverse of drive plate rotation direction from top point of drive plate 1) Angle of rotation direction).

  The hole position adjustment parameter m is a parameter capable of adjusting at which position in the torque load angle range region the torque converter mounting hole 3 is to be drilled. For example, when the vibration of the membrane vibration of the drive plate 1 is large, it is considered that the hole position is preferably in the center of the torque load angle range β, and is set to 1/2 of β, so m = 2. Further, when the vibration of the membrane vibration of the drive plate 1 is small, it is considered that the hole position is preferably in the latter half of the torque load angle range β, and m is set to 2 to 1 / ∞ of β. Set with ~ ∞.

In the first embodiment, the three-cylinder engine (n = 3), the torque load angle range β = 85 °, the hole position at the center of the torque load angle range β (m = 2), and the pinion gear 30 mounting position γ = 0. Assuming that ° (1) above,
α ₁ = 720 / 3-85 / 2 + 0 = 197.5 °
It becomes. In the case of a three-cylinder engine, the torque load angle range is generated three times during the period of two rotations of the crankshaft. Therefore, α ₂ = α ₁ × 2, α ₃ = α ₁ × 3, and the remaining hole positions are also obtained. In the case of an _n -cylinder engine, α _n = α ₁ × n is obtained. The obtained hole positions are shown in FIG. One torque converter mounting hole 3 is drilled at an angle of 77.5 ° in the counter-rotating direction of the drive plate from the top of the drive plate at the compression top dead center, and the remaining two mounting holes are arranged in the circumferential direction. Are drilled at positions at equal intervals.

  In the prior art, when the engine is started, when torque is transmitted from the pinion gear 30 to the ring gear portion 1b, the torque is applied to the drive plate 1, thereby connecting the crankshaft attachment portion and the torque converter attachment portion to a node (fixed end), web portion Membrane vibration with 1a as an abdomen is generated, and cranking sound is generated due to this membrane vibration.

  However, by providing the torque converter mounting hole 3 in the torque load angle range region and providing the set block 21 at the corresponding portion of the torque converter 20 to connect the drive plate 1 and the torque converter 20, the pinion gear 30 The vibration force generated by the meshing between the ring gear portion 1b and the ring gear portion 1b is input to the fixed end of the membrane vibration that is difficult to be excited. Therefore, the membrane vibration generated in the drive plate 1 can be effectively reduced.

  Next, a second embodiment of the drive plate coupling structure of the present invention will be described. In the drive plate coupling structure of the first embodiment, the case of defining the position of the torque converter mounting hole drilled in the torque load angle range region has been described. In the second embodiment, the torque load angle range is described. A case in which the set block 21 is provided at a position corresponding to will be described. In addition, about the structure same as 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  FIG. 4 shows the drive plate coupling structure of the second embodiment. The set block 221 of the torque converter 20 is an area on the outer peripheral side of the drive plate 1 and is welded to a portion of the torque converter 20 corresponding to the torque load angle range area, and has a sector shape whose center angle is the same as the torque load angle range β. It is formed into a shape.

  Further, there are a plurality of parts in the drive plate 1 corresponding to the set block 221, that is, parts over the torque load angle range region (two in this embodiment corresponding to one set block 221, 3 set blocks 221 are 3 A total of six torque converter mounting holes 203 are formed at predetermined intervals along the circumferential direction of the drive plate 1.

  When the engine is started, torque is transmitted from the pinion gear 30 to the ring gear portion 1b. However, since the set block 221 is provided over the torque load angle range region, the vibration generated by the engagement between the pinion gear 30 and the ring gear portion 1b is reduced. Since everything is input to the fixed end of the membrane vibration where the vibration is difficult to be excited, the membrane vibration generated in the drive plate 1 can be reduced more effectively.

  In the first embodiment, when one torque converter mounting hole is provided corresponding to one set block provided in a portion of the torque converter corresponding to a part of the torque load angle range region, In the second embodiment, a case has been described in which a plurality of torque converter mounting holes are provided corresponding to one set block provided over the torque load angle range region, but a part of the torque load angle range region is described. A plurality of torque converter mounting holes may be provided corresponding to one of the set blocks provided corresponding to the torque block, or one torque for one set block provided over the torque load angle range region. You may provide a converter attachment hole correspondingly.

  Moreover, although the said embodiment demonstrated the example which applied this invention to the 1 piece type drive plate, this invention is applicable to any of a 1 piece type drive plate and a 2 piece type drive plate.

1A is a plan view of a drive plate portion of the first embodiment, and FIG. It is a diagram which shows the relationship between a crankshaft rotation angle and the rotational speed of a ring gear part 1b and a starter motor. It is a top view of the drive plate part for demonstrating the position of the torque converter attachment hole 3 of 1st Embodiment. It is a top view of the drive plate part of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive plate 1a Web part 1b Ring gear part 2 Crankshaft mounting hole 3, 203 Torque converter mounting hole 10 Crankshaft 20 Torque converters 21, 221 Set block 22 Bolt 30 Pinion gear

Claims (3)

A drive plate having a ring gear that meshes with the starter motor gear on the outer peripheral portion is attached to each of a plurality of attachment portions provided in the torque converter by a penetrating member that passes through the drive plate. And a drive plate coupling structure
Corresponding to the angular range of the outer peripheral side of the drive plate from the crankshaft rotation angle at which torque transmission is started from the starter motor gear to the ring gear to the crankshaft rotation angle at which torque transmission is terminated A hole is formed in a central portion in the circumferential direction of the drive plate within the angular range to be provided, the mounting portion is provided in a portion of the torque converter corresponding to the hole, and the penetrating member is passed through the hole to Drive plate connection structure that attaches to the mounting part and connects the engine crankshaft and torque converter. A drive plate having a ring gear that meshes with the starter motor gear on the outer peripheral portion is attached to each of a plurality of attachment portions provided in the torque converter by a penetrating member that passes through the drive plate. And a drive plate coupling structure
An area on the outer peripheral side of the drive plate, in an angular range from the rotation angle of the crankshaft at which torque transmission from the starter motor gear to the ring gear is started to the rotation angle of the crankshaft at which transmission of torque is terminated. The mounting portion is provided at a portion of the torque converter corresponding to the corresponding angular range region , and a hole is formed in a circumferential central portion of the drive plate in the angular range region , and the penetrating member passes through the hole. And a drive plate coupling structure for coupling the engine crankshaft and the torque converter to the mounting portion. An angle from the crankshaft rotation angle at which torque transmission is started from the starter motor gear to the ring gear along the circumferential direction of the drive plate, to the crankshaft rotation angle at which the torque transmission is terminated. The drive plate coupling structure according to claim 2, which is provided over a range.

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