JP6206300B2 - Power transmission device - Google Patents

Description

  The present invention relates to a power transmission device that transmits engine power, and more particularly, to a power transmission device that includes a case that houses a transmission and is fastened to the engine.

  Conventionally, as a power transmission device of this type, for example, as described in Patent Document 1, a transmission connected to an engine and a case that houses the transmission are provided, and is disposed on the side in the vehicle width direction with respect to the case. In addition, an exhaust pipe that extends in the vehicle vertical direction and is supported by a case with a support member has been proposed.

  The support member is configured by a case side bracket that is bent in a U shape and one end is fixed to the case, and an exhaust pipe side bracket that is bent in a U shape and holds the exhaust pipe. The end of the exhaust pipe side bracket is fixed to the other end of the case side bracket with a bolt, and the exhaust pipe is fixed to the case. The support member suppresses the vibration of the case from being transmitted to the exhaust pipe, reduces the stress acting on the exhaust pipe and the support member, and improves the durability.

Japanese Patent Laid-Open No. 7-71245

  However, in the conventional power transmission device described in Patent Document 1, the vibration of the exhaust pipe is directly transmitted to the outer peripheral surface portion of the case housing the transmission, and local stress is applied to the outer peripheral surface portion of the case to which the support member is fixed. There is a problem in that local distortion occurs. Moreover, in the conventional power transmission device, there is a problem that a load is applied to the outer peripheral surface portion of the case and the vibration of the case increases. Furthermore, the vibration of the exhaust system parts including the exhaust pipe may increase due to the increase in the vibration of the case.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a power transmission device capable of suppressing vibrations of a case housing a transmission and exhaust system parts.

  A first aspect of the present invention for solving the above-described problems is that a transmission coupled to an engine is accommodated, and an annular engine fastening portion fastened to the engine by an engine fastener is provided at a front end portion in the front-rear direction of the vehicle. A power transmission device having a case having an bracket, wherein an engine fastening portion has a bracket attachment flange for attaching a bracket that supports an exhaust gas purification device disposed on a side of the engine fastening portion by means of a bracket fastener. An engine fastening hole in which a flange protrudes outward from a side surface of the case with a predetermined height and thickness and extends linearly in the vertical direction of the vehicle, and passes engine fasteners at both ends in the vertical direction Parts are formed, and there are multiple bracket fastening holes in the vertical direction to pass the bracket fastener between the engine fastening holes. It consists of those that are.

  As a second aspect of the present invention, the engine fastening hole portion is composed of an upper engine fastening hole portion located at the upper end portion in the vertical direction and a lower engine fastening hole portion located at the lower end portion in the vertical direction. The hole is composed of an upper bracket fastening hole located on the upper side in the vertical direction and a lower bracket fastening hole located on the lower side in the vertical direction. The rear back surface in the front-rear direction of the engine fastening hole portion is on substantially the same plane, and at least one of the rear rear surface in the front-rear direction of the upper bracket fastening hole portion and the rear rear surface in the front-rear direction of the lower bracket fastening hole portion. May be on the same plane as the plane.

  As a third aspect of the present invention, a recess recessed at a predetermined depth from the rear rear surface of the bracket mounting flange is formed between the upper bracket fastening hole and the lower bracket fastening hole of the bracket mounting flange. You may do it.

  As a fourth aspect of the present invention, the exhaust gas purification device tilts backward so that the front-rear rear portion of the exhaust gas purification device approaches the engine fastening portion with respect to the front portion, and one end portion in the extending direction of the bracket is exhausted. It may be attached to the rear part of the gas purification device, and the other end in the extending direction of the bracket may be attached to the bracket attachment flange.

  As a fifth aspect of the present invention, the case has a first case fastened to the engine and a second case fastened to the first case, and the first case is the second case by the case fastener. The second case fastening portion has a plurality of fastening bosses, and is disposed closest to the upper bracket fastening hole portion or the upper end portion of the bracket mounting flange among the fastening bosses. When the fastening boss is a first fastening boss, and the fastening boss disposed closest to the lower bracket fastening hole or the lower end of the bracket mounting flange is the second fastening boss, the upper end of the bracket mounting flange A first rib for connecting the first fastening boss is formed on the first case, and a second rib for connecting the lower end of the bracket mounting flange and the second fastening boss is formed on the first case. It may be.

  As a sixth aspect of the present invention, there is a boss located above the upper end portion of the bracket mounting flange and extending along the first rib, and an upper auxiliary device mounting portion for mounting the auxiliary device, or the lower end of the bracket mounting flange. A boss extending along the second rib may be located on the lower side of the part, and any one of the lower accessory attachment parts for attaching the accessory may be formed in the first case.

  As a seventh aspect of the present invention, a starter motor may be attached to the upper accessory attachment portion or the lower accessory attachment portion.

  As an eighth aspect of the present invention, an auxiliary machine mounting boss to which an auxiliary machine is attached is formed at a case fastening portion provided in the engine and fastened to the case at substantially the same height as the predetermined height of the bracket mounting flange. The case fastening portion including the accessory mounting boss may be located at a position facing the bracket mounting flange in the front-rear direction of the vehicle.

  As a ninth aspect of the present invention, it has an upper horizontal portion that extends horizontally from the rear rear surface of the upper end portion of the bracket mounting flange, and a lower horizontal portion that extends horizontally from the rear rear surface of the lower end portion of the bracket mounting flange, An upper horizontal engine fastening hole for passing the engine fastener through the upper horizontal part may be formed, and a lower horizontal engine fastening hole for passing the engine fastener through the lower horizontal part may be formed.

  Thus, according to said 1st aspect, the bracket attachment flange which protrudes with a predetermined | prescribed height and predetermined | prescribed thickness is formed in the engine fastening part of a case outward from the side surface of a case. As a result, the distance from the exhaust gas purification device to the bracket mounting flange is shortened compared to the conventional one, and the overall length of the bracket is shortened. Moreover, since it protrudes outward from the side surface of the case at a predetermined height, a sufficient contact area between the bracket mounting flange and the bracket is ensured.

  Further, since the bracket mounting flange is formed so as to extend linearly in the vertical direction of the vehicle, the portion of the bracket that contacts the bracket mounting flange can be formed linearly, and the rigidity of the bracket is improved.

  That is, if the bracket mounting flange has a bent or curved shape along the annular engine fastening portion, the portion of the bracket that contacts the bracket mounting flange also has a bent or curved shape, which may reduce the rigidity of the bracket. However, the bracket mounting flange of the present invention can prevent such rigidity from decreasing. As a result, the bracket can be firmly attached to the case, and vibrations of the catalytic converter and the exhaust pipe in the exhaust gas purification device are suppressed.

  Further, when the bracket mounting flange is formed so as to extend linearly in the vertical direction of the vehicle, the annular outer peripheral surface of the case extending from the bracket mounting flange to the engine fastening portion can be formed in a flat plate shape, and the case is enlarged. Can be prevented.

  Further, even if the vibration of the catalytic converter and exhaust pipe in the exhaust gas purification device is transmitted to the bracket mounting flange via the bracket, it is transmitted to the engine from the fastening portion where the engine and the case are fastened, so that it has high rigidity. The vibration of the catalytic converter and the exhaust pipe in the exhaust gas purification device is also dispersed in the engine having the above. Thereby, vibration applied to the case itself is suppressed.

  According to said 2nd aspect, any one of the rear back surface of the upper end part and lower end part in which the engine fastening hole part of a bracket attachment flange is located, and the rear back surface of the upper side and lower side in which a bracket fastening hole part is located. Since the two are on substantially the same plane, the bracket can be firmly attached to the bracket mounting flange.

  That is, the case is fastened to the engine through an engine fastener through the lower engine fastening hole and the lower engine fastening hole, and the bracket is attached to the bracket through the bracket fastener through the upper bracket fastening hole and the lower bracket fastening hole. It can be firmly attached to the flange. Thereby, vibration of the bracket is suppressed.

  According to said 3rd aspect, the edge part surrounding a recessed part has a function of the rib which raises rigidity, and can integrate an upper bracket fastening hole part and a lower bracket fastening hole part in an edge part. Thereby, generation | occurrence | production of a deformation | transformation between an upper bracket fastening hole part and a lower bracket fastening hole part can be suppressed, and the vibration of a bracket can be suppressed.

  Furthermore, the thickness of the vehicle in the front-rear direction between the upper bracket fastening hole and the lower bracket fastening hole can be locally reduced. Thus, when the case is manufactured by molding, it is possible to reliably prevent a cast hole from being formed between the upper bracket fastening hole and the lower bracket fastening hole. Moreover, by forming the recess, it is possible to reliably prevent a reduction in the strength of the bracket mounting flange between the upper bracket fastening hole and the lower bracket fastening hole.

  According to said 4th aspect, since the other end part of the extension direction of a bracket is attached to the rear part of the exhaust-gas purification apparatus inclined backward, the distance between an exhaust-gas purification apparatus and a case becomes short, and a bracket's The overall length can be shortened. Thus, the exhaust gas purification device can be firmly supported by the case, the bending load input to the bracket mounting flange of the case can be reduced, and the load applied to the bracket mounting flange can be reduced.

  According to said 5th aspect, even if the load input via an bracket from an exhaust-gas purification apparatus is input into a bracket attachment flange, a deformation | transformation of a bracket attachment flange is suppressed with a 1st rib and a 2nd rib. it can.

  Further, the bracket mounting flange is formed by the second case fastening portion of the first case where the first fastening boss and the second fastening boss are formed, the first rib, the bracket mounting flange, and the second rib. Since the outer peripheral surface of the first case is surrounded by a quadrangular shape, the rigidity of the bracket mounting flange and the rigidity of the outer peripheral surface portion of the first case on the side where the bracket is attached are enhanced.

  As a result, the rigidity of the outer peripheral surface portion of the bracket mounting flange and the first case is enhanced, the exhaust gas purification device can be firmly held in the first case, and vibrations of the first case and the exhaust gas purification device can be suppressed.

  According to the sixth aspect, the rigidity of the bracket mounting flange is increased by the upper accessory mounting portion having the boss extending along the first rib or the lower accessory mounting portion having the boss extending along the second rib. Therefore, even if a load is input from the exhaust gas purification device to the bracket mounting flange, the bracket mounting flange can be prevented from being deformed. Thereby, the vibration of the first case and the exhaust gas purification device is suppressed.

According to the seventh aspect, the upper accessory attachment portion or the lower accessory attachment portion is increased in rigidity by the bracket attachment flange, and the starter motor is firmly supported by the first case.
As a result, the vibration of the starter motor is suppressed, which can lead to a reduction in the vibration of the entire case.

  According to said 8th aspect, since the case fastening part provided in an engine exists in the position facing a bracket attachment flange, between an upper engine fastening hole part and a lower engine fastening hole part in a bracket attachment flange. The region portion can be prevented from being deformed to the engine side, and the bracket that supports the exhaust gas purification device is firmly supported by the first case.

  According to the ninth aspect, the fastening force between the engine and the case is increased by the upper horizontal part having the upper horizontal engine fastening hole part and the lower horizontal part having the lower horizontal engine fastening hole part. It is done. As a result, the exhaust gas purification device is firmly held at the engine fastening portion of the case, the load transmitted from the exhaust gas purification device can be distributed to the engine side, and local concentration of vibration to the case can be reduced. Further, since the exhaust gas purification device can be firmly supported by the case, it is possible to prevent the exhaust gas purification device from shaking, and to suppress an increase in vibration of the case.

FIG. 1 is a bottom view showing a bottom surface of a vehicle on which a power transmission device according to an embodiment of the present invention is mounted. FIG. 2 is a bottom view showing bottom surfaces of the power transmission device, the engine, and the exhaust gas purification device according to the embodiment of the present invention. FIG. 3 is a rear view showing the rear of the power transmission device, the engine, and the exhaust gas purification device according to the embodiment of the present invention. 4 is a left side view including a cross section of a part of the power transmission device and the engine according to the embodiment of the present invention taken along IV-IV shown in FIG. 3. FIG. 5 is a rear view showing the rear of the first case of the power transmission device according to the embodiment of the present invention. FIG. 6 is a perspective view of a first case of the power transmission device according to the embodiment of the present invention. 7 is a cross-sectional view showing a VII-VII cross section of FIG. FIG. 8 is a rear view of a modified example of the first case of the power transmission device according to the embodiment of the present invention. FIG. 9 is a rear view of another modification of the first case of the power transmission device according to the embodiment of the present invention.

  Hereinafter, a power transmission device 6 according to an embodiment in which a power transmission device according to the present invention is applied to a vehicle 1 will be described with reference to FIGS.

First, the configuration will be described.
As shown in FIG. 1, the vehicle 1 includes an engine 2, an exhaust gas purification device 3, an exhaust pipe 4, a silencer 5, a power transmission device 6, a propeller shaft 7, a differential device 8, Drive shafts 11L and 11R, left and right rear wheels 12L and 12R, and left and right front wheels 13L and 13R are configured. The vehicle 1 includes a plurality of bolts 14 as engine fasteners that fasten the power transmission device 6 to the engine 2.

In the vehicle 1, the power output from the engine 2 disposed on the front side is transmitted to the left and right rear wheels 12L and 12R via the power transmission device 6, the propeller shaft 7, the differential device 8, and the left and right drive shafts 11L and 11R. This is a so-called FR (Front engine Rear drive) vehicle.
Here, in this embodiment, the front / rear, left / right, and up / down directions are indicated by arrows in the drawing so as to coincide with the front / rear direction, the left / right direction, and the up / down direction as viewed from the driver seated in the driver's seat.

  As shown in FIG. 2, the engine 2 includes a cylinder block 21, a cylinder head 22, an oil pan 23, an oil filter 24 as an auxiliary machine, an exhaust manifold 25, a starter motor 26 as an auxiliary machine, A piston, a connecting rod, and a crankshaft.

  The engine 2 is a four-cycle engine that performs a series of four strokes consisting of an intake stroke, a compression stroke, an expansion stroke, and an exhaust stroke while a piston (not shown) housed in the cylinder block 21 reciprocates twice in the cylinder 21c of FIG. The inline 2-cylinder horizontal engine

  The cylinder block 21 is attached to a vehicle body (not shown) of the vehicle 1 via an engine mount, and accommodates a connecting rod and a crankshaft that are connected to a piston and convert a reciprocating motion of the piston into a rotational motion.

  The cylinder block 21 has a case fastening portion 21t that fastens with a first case 61 of the power transmission device 6 to be described later. An auxiliary machine mounting boss 21b (see FIG. 4) having a screw hole and an oil passage is formed on the case fastening part 21t so as to protrude from the side surface of the cylinder block 21 to the left. The case fastening portion 21t including the accessory mounting boss 21b is located at a position facing a bracket mounting flange 82 of the first case 61 described later in the front-rear direction of the vehicle.

  The cylinder head 22 is attached to the upper part of the cylinder block 21, and accommodates an intake camshaft, an exhaust camshaft, an intake valve, an exhaust valve, and a valve operating mechanism that operates each valve (not shown). . The cylinder head 22 is formed with an intake port, an exhaust port, and a combustion chamber (not shown).

  The oil pan 23 is attached to the lower part of the cylinder block 21 and stores oil for lubricating the inside of the engine 2. The oil in the oil pan 23 is supplied into the engine 2 by a pump (not shown), and after each component is lubricated, the oil pan 23 is returned to the oil pan 23.

  The oil filter 24 is fastened to the accessory mounting boss 21b of the case fastening portion 21t formed in the cylinder block 21 by a bolt (not shown), and removes foreign matters in the oil supplied from the oil pan 23 to the downstream side. Drain the oil.

  The exhaust manifold 25 is attached to the left side surface portion of the cylinder head 22 and is connected to each exhaust port (not shown) formed in the cylinder head 22. The exhaust manifold 25 has two manifolds 25t through which exhaust gas exhausted from the exhaust port passes, and a collecting pipe 25s that collects the manifolds 25t and connects to the exhaust gas purification device 3 on the downstream side.

  The exhaust gas purification device 3 is disposed in the vicinity of the downstream side of the exhaust manifold 25 and reduces air pollutants such as hydrocarbons, carbon monoxide, and nitrogen oxides contained in the exhaust gas flowing from the exhaust manifold 25, It consists of a device that exhausts the purified exhaust gas downstream, and is composed of, for example, a catalytic converter.

The exhaust gas purification device 3 is disposed such that the rear portion 3k in the front-rear direction of the exhaust gas purification device 3 is tilted rearward so as to approach an engine fastening portion 71 described later of the power transmission device 6 with respect to the front portion 3z.
As shown in FIGS. 2 and 3, the exhaust gas purification device 3 has a bracket 31.
One end portion 31a in the extending direction of the bracket 31 is attached to the rear portion 3k of the exhaust gas purifying device 3 by a bolt 3b as a bracket fastener, and the other end portion 31t in the extending direction of the bracket 31 is attached to a bracket mounting flange 82 described later. It is attached with a bolt 3b.

As shown in FIG. 1, the exhaust pipe 4 has an exhaust passage through which exhaust gas is circulated and exhausted to the atmosphere. The exhaust pipe 4 is disposed downstream of the exhaust gas purification device 3 and is supported by a vehicle body (not shown) of the vehicle 1. Has been.
The silencer 5 is provided in the exhaust pipe 4 and reduces the exhaust noise in the exhaust pipe 4 that propagates from the engine 2.

  As shown in FIGS. 2 and 4, the power transmission device 6 includes a first case 61, a second case 62, a bolt 63 that fastens the second case 62 to the first case 61, the first case 61 and the first case 61. 2 including a transmission (not shown) housed inside the case 62.

  The power transmission device 6 receives the power output from the crankshaft of the engine 2, shifts the gear according to the request of the driver of the vehicle 1, and outputs the shifted power to the propeller shaft. Transmit to the propeller shaft. Here, the 1st case 61 and the 2nd case 62 comprise the case of this invention, and the volt | bolt 63 comprises the case fastener of this invention.

  As shown in FIGS. 4, 5, and 6, the first case 61 has a cylindrical shape with openings at both ends so as to accommodate the transmission, and is manufactured by casting from a metal material such as aluminum, magnesium, or iron. The first case 61 includes an engine fastening portion 71 formed in an annular shape at the front end portion, a second case fastening portion 72 formed at the rear end portion and fastened to the second case, a first rib 73, 2 ribs 74 and an upper accessory mounting portion 75.

  The engine fastening portion 71 is formed to protrude from the front side surface of the first case 61 and has a plurality of engine fastening hole portions 81 having through holes and a bracket mounting flange 82. Bolts 14 are passed through the through holes of the engine fastening holes 81, the bolts 14 are screwed to the case fastening parts 21 t formed in the cylinder block 21 of the engine 2, and the first case 61 is fastened to the engine 2. Is done.

  As shown in FIG. 6, the bracket mounting flange 82 is positioned on the left side of the engine fastening portion 71, and has a height h, a thickness t, and a length l from the side surface of the first case 61 outward. Is formed to protrude. The height h, the thickness t, and the length l are optimum dimensions in the power transmission device 6 of the vehicle 1.

  The bracket mounting flange 82 is formed with an upper engine fastening hole portion 82a through which the bolt 14 is passed through the upper end portion j, and a lower engine fastening hole portion 82b through which the bolt 14 is passed through the lower end portion k. The bolt 14 is passed through the upper engine fastening hole portion 82 a and the lower engine fastening hole portion 82 b and screwed together, and the first case 61 is fastened to the engine 2.

  Further, the bracket mounting flange 82 is formed with an upper bracket fastening hole 82c through which the bolt 3b is passed between the upper engine fastening hole 82a and the lower engine fastening hole 82b, and the bolt 3b is passed through the lower side. A lower bracket fastening hole portion 82d is formed.

  Bolts 3 b are passed through the upper bracket fastening hole portion 82 c and the lower bracket fastening hole portion 82 d to be screwed together, and the other end portion 31 t in the extending direction shown in FIG. 3 of the bracket 31 is fastened to the bracket mounting flange 82.

As shown in FIG. 5, the rear back surface s1 in the front-rear direction of the upper engine fastening hole 82a and the rear rear surface s2 in the front-rear direction of the lower engine fastening hole 82b are formed on substantially the same plane Su. .
Further, at least one of the rear back surface s3 in the front-rear direction of the upper bracket fastening hole portion 82c and the rear rear surface s4 in the front-rear direction of the lower bracket fastening hole portion 82d is formed on the plane Su.

  Further, at least one of the upper bracket fastening hole 82c and the lower bracket fastening hole 82d is formed on a virtual plane Sv connecting the upper engine fastening hole 82a and the lower engine fastening hole 82b.

  In addition, as shown in FIG. 7, the bracket mounting flange 82 is formed with a recess 82e that is recessed at a depth d1 from the plane Su between the upper bracket fastening hole 82c and the lower bracket fastening hole 82d. . Further, a recess 82f is formed which is recessed at a depth d2 from the engine-side plane Se opposite to the plane Su.

  The second case fastening portion 72 is formed to protrude from the rear side surface of the first case 61 and has a plurality of second case fastening bosses 85 having screw holes. As shown in FIG. 4, a bolt 63 is screwed into the screw hole of each second case fastening boss 85, and the second case is fastened to the first case 61.

  As shown in FIGS. 6 and 7, the first fastening boss 85 a is formed at a position closest to the upper end j of the bracket mounting flange 82 among the plurality of second case fastening bosses 85, and the lower end of the bracket mounting flange 82 is formed. A second fastening boss 85b is formed at a position closest to the portion k.

  The first fastening boss 85a may be formed at a position closest to the upper bracket fastening hole portion 82c in the second case fastening portion 72, and the second fastening boss 85b is formed in the second case fastening portion 72. It may be formed at a position closest to the lower bracket fastening hole portion 82d.

  As shown in FIGS. 5, 6, and 7, the first rib 73 connects the first fastening boss 85 a and the upper end j of the bracket mounting flange 82 and protrudes outward from the side surface of the first case 61. It is formed.

  Similarly to the first rib 73, the second rib 74 connects the second fastening boss 85 b and the lower end portion k of the bracket mounting flange 82 and is formed to protrude outward from the side surface of the first case 61.

  The upper auxiliary machine attachment portion 75 is formed to protrude rearwardly along the side surface of the first case 61 on the upper side of the upper end portion j of the bracket attachment flange 82. Auxiliary machine mounting bosses 75 a and 75 b having screw holes are formed on the side surface of the upper auxiliary machine mounting part 75 so as to mount the auxiliary machine, and the auxiliary machine mounting boss 75 a is formed to extend along the first rib 73. The Further, an accessory mounting boss 75b having a screw hole is formed to face the accessory mounting boss 75a. The starter motor 26 shown in FIG. 2 is attached to the upper accessory attachment portion 75 by screwing bolts (not shown) into the screw holes of the accessory attachment bosses 75a and 75b.

Below, the effect of the power transmission device 6 of this embodiment is demonstrated.
According to the power transmission device 6 of the present embodiment having the above-described configuration, the engine fastening portion 71 of the first case 61 is linearly formed with a height h, a thickness t, and a length l outward from the side surface of the first case 61. A bracket mounting flange 82 is formed so as to protrude from the top.

  As a result, the distance from the exhaust gas purification device 3 to the bracket mounting flange 82 is shortened compared to the conventional one, and the overall length of the bracket 31 is shortened. Further, since the first case 61 protrudes outward from the side surface at a height h, a sufficient contact area between the bracket mounting flange 82 and the bracket 31 is ensured.

  Further, since the bracket mounting flange 82 is formed so as to extend linearly in the vertical direction of the vehicle 1, the portion of the bracket 31 that contacts the bracket mounting flange 82 can be formed linearly, and the rigidity of the bracket 31 can be increased. Enhanced.

  That is, when the bracket mounting flange 82 is bent or curved along the annular engine fastening portion 71, the portion of the bracket 31 that contacts the bracket mounting flange 82 is also bent or curved, and the rigidity of the bracket 31 is increased. Although it may be lowered, the bracket mounting flange 82 of the present embodiment can prevent such rigidity from being lowered. As a result, the bracket 31 can be firmly attached to the first case 61, and the vibration of the exhaust system parts including the exhaust gas purification device 3 and the exhaust pipe 4 is suppressed.

  When the bracket mounting flange 82 is formed so as to extend linearly in the vertical direction of the vehicle 1, the annular outer peripheral surface of the first case 61 extending from the bracket mounting flange 82 to the engine fastening portion 71 is formed in a flat plate shape. This can prevent the first case 61 from becoming large.

  Further, even if vibrations of the exhaust gas purification device 3 and the exhaust pipe 4 are transmitted to the bracket mounting flange 82 via the bracket 31, they are transmitted to the engine 2 from the fastening portion where the engine 2 and the first case 61 are fastened. Therefore, the vibrations of the exhaust gas purification device 3 and the exhaust pipe 4 are distributed to the engine 2 having high rigidity. As a result, vibration applied to the first case 61 itself is suppressed.

  Moreover, according to the power transmission device 6 of the present embodiment, the rear rear surface s1 of the upper end portion j where the upper engine fastening hole portion 82a of the bracket mounting flange 82 is located and the lower end portion k where the lower engine fastening hole portion 82b is located. The rear rear surface s2, the upper rear rear surface s3 where the upper bracket fastening hole portion 82c is located, and the lower rear rear surface s4 where the lower bracket fastening hole portion 82d is located are on substantially the same plane Su. Thereby, the bracket 31 can be firmly attached to the bracket attachment flange 82.

  Further, at least one of the upper bracket fastening hole 82c and the lower bracket fastening hole 82d is formed on a virtual plane Sv connecting the upper engine fastening hole 82a and the lower engine fastening hole 82b. Accordingly, at least one of the upper bracket fastening hole portion 82c and the lower bracket fastening hole portion 82d can be reliably prevented from being deformed, and the bracket 31 can be firmly attached to the bracket mounting flange 82.

  That is, the first case 61 is fastened to the engine 2 through the bolts 14 to the upper engine fastening hole 82a and the lower engine fastening hole 82b, and the bolt 3b is passed to the upper bracket fastening hole 82c and the lower bracket fastening hole 82d. The bracket 31 can be firmly attached to the bracket attachment flange 82. Thereby, the vibration of the bracket 31 is suppressed.

  Further, according to the power transmission device 6 of the present embodiment, the edge portion surrounding the recess 82e has a rib function for increasing rigidity, and the upper bracket fastening hole portion 82c and the lower bracket fastening hole portion 82d are connected to the edge portion. Can be integrated. As a result, the deformation between the upper bracket fastening hole 82c and the lower bracket fastening hole 82d can be suppressed, and the vibration of the bracket 31 can be suppressed.

  Furthermore, by forming the recess 82e, the thickness in the front-rear direction of the vehicle 1 between the upper bracket fastening hole 82c and the lower bracket fastening hole 82d can be locally reduced. Accordingly, when the first case 61 is manufactured by molding, it is possible to reliably prevent a cast hole from being formed between the upper bracket fastening hole portion 82c and the lower bracket fastening hole portion 82d. Further, by forming the recess 82e, it is possible to reliably prevent a decrease in strength of the bracket mounting flange 82 between the upper bracket fastening hole portion 82c and the lower bracket fastening hole portion 82d.

  According to the power transmission device 6 of the present embodiment, the other end in the extending direction of the bracket 31 is attached to the rear portion of the exhaust gas purification device 3 that is tilted backward, so that the space between the exhaust gas purification device 3 and the first case 61 is , And the overall length of the bracket 31 can be shortened. Thus, the exhaust gas purification device 3 can be firmly supported by the first case 61, the bending load input to the bracket mounting flange 82 of the first case 61 can be reduced, and the load applied to the bracket mounting flange 82 can be reduced.

  Further, according to the power transmission device 6 of the present embodiment, even if a load input from the exhaust gas purification device 3 via the bracket 31 is input to the bracket mounting flange 82, the first rib 73 and the second rib 74. Thus, deformation of the bracket mounting flange 82 can be suppressed.

  In addition, the second case fastening portion 72 of the first case 61 where the first fastening boss 85a and the second fastening boss 85b are formed, the first rib 73, the bracket mounting flange 82, and the second rib 74, The outer peripheral surface of the first case 61 in which the bracket mounting flange 82 is formed is surrounded by a square shape. As a result, the rigidity of the bracket mounting flange 82 and the rigidity of the outer peripheral portion of the first case 61 on the side where the bracket 31 is mounted are enhanced.

  Further, when the rigidity of the bracket mounting flange 82 and the outer peripheral portion of the first case 61 are both increased, the exhaust gas purification device 3 is firmly held by the first case 61 and the exhaust gas purification device 3 and the first case 61 Vibration is suppressed.

  Further, according to the power transmission device 6 of the present embodiment, the rigidity of the bracket mounting flange 82 is enhanced by the upper auxiliary machine mounting portion 75 having the auxiliary machine mounting boss 75a extending along the first rib 73, and the exhaust gas purification. Even if a load is input from the device 3 to the bracket mounting flange 82, the bracket mounting flange 82 can be prevented from being deformed. As a result, vibrations of the first case 61 and the exhaust gas purification device 3 are suppressed.

  Further, according to the power transmission device 6 of the present embodiment, the rigidity of the upper auxiliary machine mounting portion 75 is increased by the bracket mounting flange 82, and the starter motor 26 is connected to the first case 61 via the upper auxiliary machine mounting portion 75. Strongly supported. Thereby, the vibration of the starter motor 26 is suppressed, and the overall vibration in the first case 61 can be reduced.

  Further, according to the power transmission device 6 of the present embodiment, the case fastening portion 21t provided in the engine 2 is located at a position facing the bracket mounting flange 82, so that the upper engine fastening hole portion 82a and the lower The region portion between the side engine fastening hole portion 82b can be prevented from being deformed to the engine 2 side, and the bracket 31 that supports the exhaust gas purification device 3 is firmly supported by the first case 61.

  Further, the accessory mounting boss 21b formed in the case fastening portion 21t is located at a position facing the bracket mounting flange 82, and between the upper engine fastening hole portion 82a and the lower engine fastening hole portion 82b in the bracket mounting flange 82. Since the auxiliary machine mounting boss 21b increases the rigidity of the case fastening portion 21t around the auxiliary machine mounting boss 21b, the bracket mounting flange 82 tends to be deformed to the engine 2 side. It can be blocked by the accessory mounting boss 21b. As a result, the bracket 31 that supports the exhaust gas purification device 3 is securely and firmly supported by the first case 61.

  In the power transmission device 6 in the present embodiment, the upper engine fastening hole 82a and the lower engine fastening hole 82b are formed in the bracket mounting flange 82, and the upper engine fastening hole 82a and the lower engine fastening hole 82b are formed. Although the case where the first case 61 is configured to be fastened to the engine 2 through the bolts 14 has been described, it may be configured with a structure other than the structure of the bracket mounting flange 82.

  For example, as shown in FIG. 8, the bracket mounting flange 82 may be configured with a bracket mounting flange 82A according to a modification of the embodiment. The bracket mounting flange 82A is configured in the same manner as the bracket mounting flange 82 of the embodiment except for the configuration of the upper horizontal portion 91 and the lower horizontal portion 92. In addition, the same code | symbol is attached | subjected about the structure similar to the bracket attachment flange 82 of embodiment in FIG.

  The bracket mounting flange 82A extends horizontally further from the rear rear surface s1 of the upper engine fastening hole portion 82a to the upper horizontal portion 91 that horizontally extends further upward and from the rear rear surface s2 of the lower engine fastening hole portion 82b. It has a structure having a lower horizontal portion 92.

  In the bracket mounting flange 82A, an upper horizontal engine fastening hole portion 91a through which the bolt 14 is passed is formed in the upper horizontal portion 91, and a lower horizontal engine fastening hole portion 92a through which the bolt 14 is passed is formed in the lower horizontal portion 92. The The bolt 14 is passed through the upper horizontal engine fastening hole 91 a and the lower horizontal engine fastening hole 92 a, and the first case 61 is fastened to the engine 2.

  With this configuration, the fastening force between the engine 2 and the first case 61 is determined by the upper horizontal portion 91 having the upper horizontal engine fastening hole portion 91a and the lower horizontal portion 92 having the lower horizontal engine fastening hole portion 92a. Is further enhanced.

  Thus, the exhaust gas purification device 3 is more firmly held by the engine fastening portion 71 of the first case 61, the load transmitted from the exhaust gas purification device 3 can be distributed to the engine side, and the vibration of the 61 to the first case is caused. It can alleviate local concentration. In addition, since the exhaust gas purification device 3 can be more firmly supported by the first case 61, the exhaust gas purification device 3 can be reliably prevented from shaking, and the increase in vibration of the first case 61 can be more reliably suppressed.

  In the power transmission device 6 according to the present embodiment, the boss 75 a that is located on the upper side of the upper end portion of the bracket mounting flange 82 and extends along the first rib 73 is provided in the upper case attachment portion 75 of the first case 61. Although the case where it comprises with the structure which has is demonstrated, you may comprise with structures other than the structure of the upper auxiliary machine attachment part 75. FIG.

For example, as shown by the phantom line in FIG. 9, the bracket mounting flange 82 may have a lower accessory mounting portion 75 </ b> A positioned below the lower end portion k of the bracket mounting flange 82.
The lower accessory mounting portion 75 </ b> A is formed below the lower end portion k of the bracket mounting flange 82 so as to protrude rearward along the side surface of the first case 61. Auxiliary machine mounting bosses 75Aa and 75Ab having screw holes are formed on the side surface of the lower auxiliary machine mounting part 75A so as to mount the auxiliary machine, and the auxiliary machine mounting bosses 75Aa are formed to extend along the second rib 74. Is done.

  Further, an accessory mounting boss 75Ab having a screw hole is formed to face the accessory mounting boss 75Aa. The starter motor 26 shown in FIG. 2 is attached to the lower accessory attachment portion 75A by screwing bolts (not shown) into the screw holes of the accessory attachment bosses 75Aa and 75Ab.

  With this configuration, the rigidity of the bracket attachment flange 82 is increased by the lower accessory attachment boss 75 </ b> A in which the accessory attachment boss 75 </ b> Aa extending along the second rib 74 is formed, and the bracket attachment flange 82 from the exhaust gas purification device 3. Even if a load is input to the bracket mounting bracket 82, it is possible to prevent the bracket mounting flange 82 from being deformed. As a result, vibrations of the first case 61 and the exhaust gas purification device 3 are suppressed.

  Further, the rigidity of the lower accessory mounting portion 75A is enhanced by the bracket mounting flange 82, and the starter motor 26 is firmly supported by the first case 61. Thereby, the vibration of the starter motor 26 is suppressed, and the overall vibration of the first case 61 can be reduced.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

DESCRIPTION OF SYMBOLS 1 ... Vehicle, 2 ... Engine, 3 ... Exhaust gas purification apparatus, 3b ... Bolt (bracket fastener), 3k ... Rear part, 6 ... Power transmission device, 14 ... Bolt (engine fastener), 21t ... Case fastening part, 26 ... starter motor (auxiliary machine), 31 ... bracket, 31a ... one end in the extending direction, 31t ... the other end in the extending direction, 61 ... first case, 62 ... second case, 71 ... engine fastening portion, 72 ... first 2 case fastening part, 73 ... 1st rib, 74 ... 2nd rib, 75 ... Upper side auxiliary equipment attaching part, 75a ... Auxiliary equipment attaching boss (boss extending along the 1st rib), 75A ... Lower side auxiliary equipment attaching part 75Aa ... Auxiliary machine mounting boss (boss extending along the second rib), 81 ... Engine fastening hole, 82, 82A ... Bracket mounting flange, 82a ... Upper engine fastening hole, 82b ... Lower engine fastening hole, 82c ... Upper bracket G fastening hole, 82d ... lower bracket fastening hole, 82e ... recess, 85 ... second case fastening boss, 85a ... first fastening boss (fastening boss), 85b ... second fastening boss (fastening boss), 91 ... Upper horizontal portion, 91a ... Upper horizontal engine fastening hole, 92 ... Lower horizontal portion, 92a ... Lower horizontal engine fastening hole, j ... Upper end portion, k ... Lower end portion, s1, s2, s3, s4 ... Rear rear surface , Su ... plane

Claims (9)

A power transmission device comprising a case that houses a transmission connected to an engine and has an annular engine fastening portion fastened to the engine by an engine fastener at a front end portion in the front-rear direction of the vehicle,
The engine fastening portion has a bracket mounting flange for attaching a bracket that supports an exhaust gas purification device disposed on a side of the engine fastening portion by a bracket fastener;
The bracket mounting flange protrudes outward from the side surface of the case with a predetermined height and a predetermined thickness, and is formed to extend linearly in the vertical direction of the vehicle,
Engine fastening holes for passing the engine fasteners are formed at both ends in the vertical direction,
A power transmission device, wherein a plurality of bracket fastening holes for passing the bracket fasteners between the engine fastening holes are formed in the vertical direction. The engine fastening hole is composed of an upper engine fastening hole located at the upper end in the vertical direction and a lower engine fastening hole located at the lower end in the vertical direction,
The bracket fastening hole portion is composed of an upper bracket fastening hole portion located on the upper side in the vertical direction and a lower bracket fastening hole portion located on the lower side in the vertical direction,
A rear back surface in the front-rear direction of the upper engine fastening hole,
The rear back surface in the front-rear direction of the lower engine fastening hole is on substantially the same plane,
At least one of the rear rear surface in the front-rear direction of the upper bracket fastening hole and the rear rear surface in the front-rear direction of the lower bracket fastening hole is on the same plane as the plane. The power transmission device according to claim 1.   The concave portion recessed at a predetermined depth from the rear rear surface of the bracket mounting flange is formed between the upper bracket fastening hole portion and the lower bracket fastening hole portion of the bracket mounting flange. Item 3. The power transmission device according to Item 2. The exhaust gas purification device tilts backward such that the rear portion of the exhaust gas purification device approaches the engine fastening portion with respect to the front portion,
2. The power according to claim 1, wherein one end of the bracket in the extending direction is attached to the rear portion of the exhaust gas purifying device, and the other end of the bracket in the extending direction is attached to the bracket mounting flange. Transmission device. The case includes a first case fastened to the engine and a second case fastened to the first case;
The first case has a second case fastening portion fastened to the second case by a case fastener;
A plurality of fastening bosses are formed on the second case fastening portion,
Among the fastening bosses, the fastening boss arranged closest to the upper bracket fastening hole or the upper end of the bracket mounting flange is a first fastening boss,
When the fastening boss located closest to the lower end of the lower bracket fastening hole or the bracket mounting flange among the fastening bosses is a second fastening boss,
Forming a first rib in the first case for connecting an upper end portion of the bracket mounting flange and the first fastening boss;
4. The power transmission device according to claim 2, wherein a second rib that connects a lower end portion of the bracket mounting flange and the second fastening boss is formed in the first case. 5. It is located above the upper end of the bracket mounting flange and has a boss extending along the first rib, and is located below the upper accessory mounting part for attaching the accessory or the lower end of the bracket mounting flange. The power according to claim 5, further comprising: a boss extending along the second rib, wherein any one of the lower accessory attachment parts to which the accessory is attached is formed in the first case. Transmission device.   The power transmission device according to claim 6, wherein a starter motor is attached to the upper accessory attachment portion or the lower accessory attachment portion. An auxiliary machine mounting boss to which an auxiliary machine is attached is formed at a case fastening portion provided in the engine and fastened to the case at substantially the same height as the predetermined height of the bracket mounting flange.
2. The power transmission device according to claim 1, wherein the case fastening portion including the auxiliary machine mounting boss is located at a position facing the bracket mounting flange in the front-rear direction of the vehicle. An upper horizontal portion extending horizontally from the rear back surface of the upper end portion of the bracket mounting flange;
A lower horizontal portion extending horizontally from the rear back surface of the lower end portion of the bracket mounting flange,
An upper horizontal engine fastening hole for passing the engine fastener through the upper horizontal part is formed,
The power transmission device according to claim 2, wherein a lower horizontal engine fastening hole portion through which the engine fastener is passed is formed in the lower horizontal portion.

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