CN109789762B

CN109789762B - Drive system for hybrid vehicle

Info

Publication number: CN109789762B
Application number: CN201780062111.7A
Authority: CN
Inventors: K·苏巴马尼萨提亚纳拉亚南; M·梅巴兰; C·萨布兰尼安
Original assignee: TVS Motor Co Ltd
Current assignee: TVS Motor Co Ltd
Priority date: 2016-09-12
Filing date: 2017-09-11
Publication date: 2022-08-30
Anticipated expiration: 2037-09-11
Also published as: WO2018047126A1; CN109789762A; TW201811584A; TWI743194B

Abstract

The subject matter described herein relates to a drive system (200) for a hybrid vehicle. The drive system (200) according to one aspect of the invention comprises a motor shroud (201) adapted to be mounted to the hub of the rear wheel (127), the motor shroud (201) covering the traction motor (150) of the vehicle. The drive system (200) further comprises components such as a driven member (202), a one-way clutch (203) and a driven pulley (204) for transmitting power from the engine of the vehicle to the rear wheels (127). The motor guard (201) serves to support the driven pulley (204) and the driven member (202) on the outer surface thereof without using an additional support member, thereby enabling compactness at the rear wheel hub and overall compactness and lightness of the hybrid vehicle.

Description

Drive system for hybrid vehicle

Technical Field

The subject matter described herein relates generally to drive systems for hybrid two-wheeled vehicles.

Background

In view of stringent emission standards, there has recently been an increasing demand for emission control in motor vehicles. Therefore, many hybrid vehicles and electric vehicles are emerging to minimize emissions.

For example, a typical hybrid vehicle configured to be powered by either an internal combustion engine or a traction motor independently or both is replacing a conventional engine-driven vehicle. The hybrid vehicle is configured to operate in different operating modes, such as an engine-only mode, a motor-only mode, a hybrid economy mode, and the like. In particular, the hybrid vehicle, particularly a parallel type hybrid vehicle, includes a drive system for transmitting power from the engine to the rear wheels when the engine is operated in different operating modes, such as a single engine mode, a hybrid mode, or a hybrid economy mode. However, when the motor is operated alone, it directly drives the rear wheels without involving any power transmission system.

In the known art, the drive system provided to transmit power from the internal combustion engine to the rear wheels comprises a driven pulley directly supported on a flange permanently and rigidly fixed to the motor casing of the traction motor. In particular, the flange made of steel is used to support the driven pulley. Thus, the presence of the flange causes a significant increase in weight at the rear wheel hub, resulting in an increase in inertia at the rear wheel of the hybrid vehicle. The increase in inertia at the rear wheels results in energy loss, which is undesirable. Furthermore, the presence of the flange also results in an overall increase in the width and weight of the hybrid vehicle. Further, in the hybrid vehicle, it is also necessary to prevent energy loss due to an increase in friction of the belt of the drive system.

Further, in the case where the traction motor of the hybrid vehicle is operated to drive the rear wheels, it is necessary to isolate the engine from the traction motor so that no power is transmitted from the motor to the engine.

Accordingly, it is desirable to provide a drive system in which energy losses are minimized while ensuring that no power is transmitted from the motor to the engine. In addition, compactness and lightness of the drive system must be achieved, thereby achieving overall compactness and lightness of the hybrid vehicle.

It is therefore desirable to address the problems encountered as discussed above in the background section.

Drawings

A detailed description of the present subject matter is described with reference to the accompanying drawings. In the drawings the same reference numerals are used to refer to the same features and components.

Fig. 1 shows a side view of a hybrid vehicle including a drive system according to an embodiment of the invention.

Fig. 2a shows a cross-sectional view of a drive system according to a first embodiment of the invention connected to a rear wheel.

Fig. 2b shows a sectional view of the drive system according to the first embodiment of the invention, depicting the arrangement of the driven pulley.

Figure 3a shows a side cross-sectional view of a drive system according to a second embodiment of the invention connected to a rear wheel.

Fig. 3b shows a cross-sectional view of the drive system according to a second embodiment of the invention, taken along the line a-a in fig. 3 a.

Fig. 4 shows an exploded view of a drive system according to a second embodiment of the invention.

Figure 5 shows a cross-sectional view of the driven member of the drive system according to a second embodiment of the invention.

Fig. 6 shows a sectional view of the driven pulley of the drive system according to the second embodiment of the invention.

Fig. 7 shows a sectional view of a drive system according to a third embodiment of the invention.

Detailed Description

The present invention has been devised in view of the problems set forth above.

It is an object of the present invention to provide a hybrid vehicle including a drive system, the configuration and arrangement of which helps prevent energy loss.

It is another object of the present invention to provide a drive system for a hybrid vehicle that helps prevent power transmission to an engine of the vehicle during a motor operation of the vehicle.

It is another object of the present invention to provide a drive system arranged in a manner that contributes to lightness and compactness of a hybrid vehicle.

It is a further object of the present invention to provide a drive system which is constructed and arranged to facilitate smooth transitions between various vehicle operating modes.

It is a further object of the present invention to provide a drive system configured such that wear of its components is ensured to be minimized.

It is a further object of the present invention to provide a drive system configured such that its components are easy to assemble.

Accordingly, the subject matter described herein relates to a drive system for a hybrid vehicle that includes an internal combustion engine and a traction motor for driving the rear wheels of the vehicle. The traction motor in this embodiment is a hub mounted traction motor. In particular, the operation of the engine or the traction motor, or both, to drive the vehicle depends on the selection of different drive modes, such as a single engine mode in which the engine alone powers the vehicle, a single motor mode in which the traction motor alone powers the vehicle, a hybrid power mode in which the engine and the traction motor together power the hybrid vehicle, and a hybrid economy mode in which only the engine or only the traction motor, or both, power the hybrid vehicle depending on vehicle operating conditions (e.g., vehicle speed, etc.). In particular, the hybrid vehicle includes a drive system for transmitting power from the internal combustion engine to the rear wheels when the engine is operating in a single engine mode or in a hybrid economy mode. A drive system according to an aspect of the invention prevents power transmission from a rear wheel to an engine in a case where the motor powers the vehicle. The drive system according to the invention comprises a motor shield for covering the traction motor from at least one side and which motor shield is in turn configured to support other components of the drive system, including the driven member and the driven pulley. The driven pulley supports a belt for transmitting power from the engine to the rear wheel. According to the present invention, the drive system further includes a one-way clutch for preventing power from being transmitted from the rear wheel to the engine through the belt when the motor alone powers the rear wheel. While in one embodiment the one-way clutch is fixed to the driven member, in another embodiment the one-way clutch is fixed to the driven pulley. Furthermore, the presence of the one-way clutch ensures that the belt is not driven even when the vehicle is descending a slope. Thus, the drive system according to the invention helps to ensure that the belt is not driven unnecessarily, thereby preventing wear of the belt. Thus, unnecessary energy loss due to belt friction is prevented. Further, since the portion of the drive system including the driven member and the driven pulley is supported to the motor guard without involving the use of an additional support member, the compactness of the hybrid vehicle is ensured. In particular, the lightness of the hybrid vehicle is also ensured, since in the present invention the use of any mounting member permanently integrated with the motor shroud is eliminated.

According to another aspect of the invention, a plurality of damping members are disposed between the motor shroud and portions of the driven pulley so as to be able to smoothly switch over during different vehicle operating modes without jerking the hybrid vehicle.

Accordingly, aspects of the present invention contribute to preventing power transmission to the engine when the traction motor is driven, thereby preventing unnecessary driving of the belt, while also ensuring compactness and lightness of the hybrid vehicle.

The summary of the invention provided above explains the essential features of the invention, and does not limit the scope of the invention. The nature and further features of the invention will become more apparent from the following description with reference to the accompanying drawings.

Exemplary embodiments showing detailed features of the drive system of the present invention will be described below with reference to the accompanying drawings. Various aspects of the different embodiments of the invention will be apparent from the following description, which is set forth below. Indeed, the following description conveniently provides illustrations of exemplary embodiments for implementing the present invention. Further, it should be noted that, unless otherwise noted, the terms "upper", "lower", "right", "left", "front", "forward", "rearward", "downward", "upward", "top", "bottom", and the like are used herein based on the illustrated state or the standing state of the hybrid vehicle in which the driver is seated. Furthermore, longitudinal axis refers to the longitudinal direction defining the vehicle with respect to the front-rear axis of the vehicle; and the transverse axis refers to a side-to-side or left-to-right axis with respect to the vehicle, defining the transverse direction of the vehicle. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.

The arrow provided in the upper right corner of each figure depicts the direction relative to the motorcycle, where applicable, arrow F indicates the front, arrow R the rear, arrow Up the upper, arrow Dw the lower, arrow Rh the right and arrow Lh the left.

Referring to fig. 1, a hybrid vehicle 100 is described according to an embodiment of the invention. Fig. 1 is a side view of the hybrid vehicle 100. The vehicle 100 is shown with a step frame assembly 105. The striding frame assembly 105 includes a head tube 105A, a main tube 105B, and a pair of side tubes 105C. Specifically, the main tube 105B extends downward and rearward from the front of the head tube 105A. Further, a pair of side pipes 105C extend obliquely upward from the main pipe 105B toward the rear end of the vehicle 100. Thus, the frame assembly 105 extends from the front to the rear of the vehicle.

The hybrid vehicle 100 further includes a plurality of body panels for covering and mounting the frame assembly 105 thereon. In the present embodiment, the plurality of panels include a front panel 115A, a leg shield 115B, an under-seat cover 115C, and left and right side panels 115D and 115D. Further, a glove box may be mounted to the leg shield 115B.

In a stepping space formed between the leg shield 115B and the under seat cover 115C, a step 120 is provided. Further, a seat assembly 125 is disposed above the under seat cover 115C and is mounted to the pair of side tubes 105C. A tool box (not shown) is disposed below the seat assembly 125. A fuel tank (not shown) is positioned at one end of the tool box. A rear fender 126 for covering at least a portion of the rear wheel 127 is positioned below the fuel tank.

One or more suspension/shock absorbers 130 are provided at the rear of the vehicle 100 for more comfortable riding. Further, the vehicle 100 includes a plurality of electric and electronic components including a headlight 135A, a tail lamp 135B, a Transistor Control Ignition (TCI) unit (not shown), a starter motor (not shown), and the like. A touch screen LCD unit (not shown) is provided on the handle 110 to display various operation modes, power flow modes, and warning signals. The rear view mirrors 112 are installed at right and left sides of the handle 110. The vehicle 100 is also provided with a hazard warning lamp (not shown).

An internal combustion engine 140 (hereinafter referred to as an engine) is disposed behind the pedal 120 and supported between the pair of side pipes 105C. In particular, the internal combustion engine 140 is supported by the swing arm 109. Swing arm 109 is attached to the lower portion of main tube 105B by a crank link (not shown). The other end of the swing arm 109 holds the rear wheel 127. The rear wheel 127 and swing arm 109 are connected to a pair of side frames 105C by one or more shock absorbers 130 disposed on either side of the vehicle 100.

The hybrid vehicle 100 also includes a traction motor 150 mounted on the hub of the rear wheel 127. The traction motor 150 is powered by a battery (not shown) disposed at the rear of the vehicle. A controller (not shown) is also provided to control the various vehicle operating modes.

The hybrid vehicle 100 is configured to be propelled by the engine 140 alone or by the traction motor 150 alone, or by both the engine 140 and the traction motor 150. At zero vehicle speed, the rider can select any one of the following four operational drive modes by means of mode switching. The four operational drive modes of the hybrid vehicle 100 are: (a) a single engine mode, in which the engine 140 alone powers the vehicle; (b) a single motor mode, in which the traction motor 150 alone powers the vehicle; (c) a hybrid mode, in which the engine 140 and the traction motor 150 together power the hybrid vehicle 100; (d) a hybrid economy mode in which only the engine 140 or only the traction motor 150, or both, power the hybrid vehicle depending on vehicle operating conditions.

In other words, the rear wheels 127 of the vehicle are driven by the engine 140 alone or by the motor 150 alone or by both the engine 140 and the motor 150. In particular, according to one embodiment of the invention, power is transmitted from the engine 140 to the rear wheels 127 through a transmission assembly that includes a drive system 200 (shown in FIG. 2 a). However, when the traction motor 150 is driven, power from the motor 150 is directly transmitted to the rear wheels 127. According to one embodiment and as can be seen in fig. 2a, said traction motor 150 is covered from at least one side by a motor shroud 201. According to one aspect of the invention, the motor shroud 201 is configured to at least partially enclose/house one or more portions of the drive system 200, and thus constitutes a portion of the drive system 200. On the other side of the axle 129, a motor shroud 201 is used to house a brake drum (not shown). Thus, compactness of the hybrid vehicle at the hub is achieved as the motor shroud 201 serves to house portions of the drive system 200 and the brake drum. In addition, since the drive system and the brake drum are directly supported on the motor guard 201 without an additional member for supporting them, the portability of the vehicle is also achieved.

According to the first embodiment of the invention, power from the engine 140 is transmitted to the rear wheels 127 through the drive system 200. As seen in fig. 2a, the drive system 200 according to the present embodiment includes a belt 205 supported between a drive pulley 207 and a driven pulley 204; the drive pulley 207 is supported on the output shaft 141 of the engine, and the driven pulley 204 is directly supported on the motor shroud 201. Preferably, the belt 205 is a toothed belt. Specifically, while one end of the belt 205 is supported on the first flange 205a fixed to the output shaft 141, the other end of the belt 205 is supported on the second flange 205b fixed to the driven pulley 204. For example, in the present embodiment, when the first flange 205a is disposed outside the output shaft 141, the second flange 205b is disposed inside the driven pulley 204, facing the rear wheel 127. Providing the first flange 205a and the second flange 205b as described above enables the band 205 to be easily assembled.

Furthermore, according to the first embodiment and as can be seen in fig. 2a and 2b, the driven pulley 204 is rigidly supported directly on the motor shroud 201. For example, as seen in fig. 2b, the driven pulley 204 is secured to the motor shroud 201 by fasteners 208. More specifically, a plurality of mounting lugs 201a are provided on the motor shroud 201 to receive the driven pulley 204. Once the driven pulley 204 is positioned on the plurality of mounting lugs 201a, fasteners 208 are used to secure the driven pulley 204. Thus, the use of a flange for mounting the driven pulley 204 according to the prior art is eliminated. Furthermore, since the driven pulley 204 is directly supported on the motor shroud 201, when said pulley 204 rotates, it directly rotates the motor shroud 201, which in turn rotates the rear wheel 127. Therefore, since the motor does not rotate unnecessarily, power is transmitted directly to the rear wheels 127 through the drive system 200 without causing any energy loss. Furthermore, since the use of a flange for mounting the driven pulley is eliminated, the weight at the hub of the rear wheel is significantly reduced, resulting in a reduction in inertia at the rear wheel, which in turn results in a reduction in energy loss.

The drive system 200 includes a belt 205 and a driven pulley 204 for transmitting power to the rear wheels 127 in an operating state of the engine, such as an engine-only mode, a hybrid mode, or a hybrid economy mode, when the engine powers the vehicle.

Furthermore, the drive system 200 according to the present invention is also adapted to prevent power from being transmitted to the engine 140 when the rear wheels 127 are driven by the traction motor 150. According to a preferred embodiment and as can be seen in fig. 2a, the drive system 200 comprises a one-way clutch 203 for preventing power transmission from the rear wheels 127 to the engine 140.

Fig. 2a shows an arrangement of a one-way clutch 203 according to one embodiment of the invention. As can be seen in fig. 2a, the one-way clutch 203 is coupled to the output shaft 141 of the internal combustion engine 140. The presence of the one-way clutch 203 at the output shaft 141 ensures that no power is transmitted to the engine 140 when the motor drives the rear wheels 127. In particular, when the motor 150 powers the rear wheels 127, the one-way clutch 203 disengages from the output shaft 141 or begins to slip on the output shaft 141, thereby cutting off power transmission to the engine 140 at the output shaft 141.

The arrangement and operation of a drive system 200 including a one-way clutch 203 according to another embodiment of the present invention is described in detail in fig. 3a to 6. Fig. 3b shows a cross-sectional view of the drive system 200 taken along line a-a in fig. 3 a. The drive system 200 according to the present embodiment includes a motor shroud 201, the motor shroud 201 being concentrically arranged around the rear wheel shaft 129 for covering the traction motor 150 from at least one side, and being fixed to the hub of the rear wheel 127. For example, in this embodiment, the motor shroud 201 is removably attached to the hub by fasteners 208. Further, the motor shroud 201 is adapted to receive one or more components of the drive system 200. According to a second embodiment of the invention and visible in fig. 3b and 4, the motor shroud 201 is adapted to support the driven member 202 of the drive system 200. In particular, the motor shroud 201 is provided with a plurality of mounting lugs 201a arranged radially along its outer surface for receiving the driven member 202. The driven member 202 is correspondingly provided with a plurality of mounting holes 202a for positioning on the plurality of mounting lugs 201 a. Further, the driven member 202 includes a central aperture 202b, the central aperture 202b being concentrically disposed about the rear axle 129 when the driven member 202 is positioned on the plurality of mounting lugs 201 a. The driven member 202 according to the present embodiment includes a one-way clutch 203. In particular, the one-way clutch 203 is press-fit in a central bore 202b of the driven member 202 (as shown in fig. 5). Thus, the driven member 202 detachably attached to the motor shroud 201 by the plurality of mounting lugs 201b is concentrically arranged around the rear axle 129 with the one-way clutch 203 spaced from the rear axle 129. Thus, the motor shroud 201 is adapted to removably receive the driven member 202.

Further, the motor shroud 201 is provided with a plurality of damping members 201b, the damping members 201b being configured to be positioned on each of the plurality of mounting lugs 201 a. In particular, by providing the holder member 206, it is ensured that the plurality of damper members 201b positioned on the plurality of mounting lugs 201a do not fall off/fall off due to vibration. In the present embodiment, the holder member 206 is provided in the form of a plate and is fixed to the plurality of mounting lugs 201a by fasteners 208, thereby ensuring that the plurality of damping members 201b are not displaced/dropped off in the vehicle running state. Thus, the retainer member 206 is also concentrically disposed about the rear axle 129.

Furthermore, according to the present embodiment, the driven pulley 204 is also concentrically arranged around the rear axle 129 and floatingly supported on the axle 129. In the present embodiment, the driven pulley 204 includes a needle bearing 204n at a central portion thereof, and the needle bearing 204n is placed directly on the rear wheel shaft 129. Further, the driven pulley 204 includes a projecting sleeve member 204a (shown in fig. 6) which is held in contact with the one-way clutch 203 in the assembled state of the driven pulley 204. In the present embodiment, the projecting sleeve member 204a is formed by casting together with the driven pulley 204. However, in another embodiment, the projecting sleeve member 204a may be press-fit to the driven pulley 204.

In the engine operating state, power is transmitted from the output shaft 141 (shown in fig. 2 b) to the rear wheels 127 by the drive system 200. In particular, since the one-way clutch 203 is in contact with the projecting sleeve member 204a of the driven pulley 204, when the driven pulley 204 starts rotating, it rotates the one-way clutch 203. Further, since the one-way clutch 203 is disposed in the driven member 202, it rotates the driven member 202. Further, since the driven member 202 is fixed to the motor shroud 201, rotation of the driven member 202 rotates the motor shroud 201, thereby rotating the rear wheel 127. Thus, in engine operating conditions, including operating the engine in a single engine mode, a hybrid mode, and a hybrid economy mode, the drive system 200 directly transfers power from the engine to the rear wheels 127.

With the traction motor 150 operating, including in the motor-only mode and in the hybrid economy mode, the traction motor rotates the rear wheels 127, causing the motor shroud 201 to rotate. Rotation of the motor shroud 201 in turn causes the driven member 202 and the one-way clutch 203 to rotate. However, since the one-way clutch 203 is in contact with the projecting sleeve member 204a of the driven pulley 204, the projecting sleeve member 204a attempts to exert an opposite force on the one-way clutch 203, so the one-way clutch 203 starts to slide on the projecting sleeve member 204 a. As a result, the one-way clutch 203 fails to transmit power to the driven pulley 204 so that the driven pulley 204 is driven in the motor operation state. Thus, it is ensured that no power is transmitted to the engine 140 through the drive system 200 in the motor-only mode or the hybrid economy mode. Further, since the one-way clutch 203 fails to transmit power to the driven pulley 204 in the motor operating state, in which the driven pulley 204 supports the belt 205, it is ensured that the belt 205 is not driven during the motor driving. As a result, the energy loss due to the friction of the belt is surely eliminated.

According to a third embodiment of the invention and as can be seen in fig. 7, the one-way clutch 203 may be arranged in the driven pulley 204, and the driven pulley 204 may be arranged above a sleeve member or insert member 201c cast with the motor shroud 201. In particular, the driven pulley 204 is concentrically disposed over the insert member 201c, with the insert member 201c supported over a needle bearing 204 n. In the present embodiment, the one-way clutch 203 is press-fitted in the driven pulley 204. During operation of the engine 140, the one-way clutch 203 engages the insert member 201c, causing the insert member 201c to rotate, thereby rotating the motor shroud 201. Thereby causing the rear wheel 127 to rotate. However, when the motor 150 starts to operate, the one-way clutch 203 starts to slip on the insertion member 201c, thereby preventing the driven pulley 204 from rotating; and thus prevents power from being transmitted to the engine. In another embodiment, the insert member may be press fit over the motor housing. Thus, the third embodiment of the present invention eliminates the need for a separate driven member for enclosing/housing the one-way clutch disclosed in the second embodiment. However, the operation of the one-way clutch remains the same as discussed in the first and second embodiments.

According to an aspect of the present invention, since the drive system including the driven pulley is directly supported on the motor guard without a separate mounting member, the compactness of the drive system and the compactness of the hybrid vehicle are maintained. Furthermore, the presence of a plurality of damping members ensures a smooth power transmission from the drive system to the hub of the rear wheel, thereby ensuring that the hybrid vehicle does not experience jerks when a different operating mode is selected.

While the invention has been shown and described with reference to the foregoing preferred embodiments, it will be apparent to those skilled in the art that changes in form, connection and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A drive system (200) for a hybrid vehicle (100), the hybrid vehicle (100) comprising:

an internal combustion engine (140); and

a hub-mounted traction motor (150) configured to drive a rear wheel (127) of the hybrid vehicle (100);

the internal combustion engine (140) being operatively connected to the traction motor (150) by the drive system (200),

wherein at least a portion of the drive system (200) is concentrically arranged about an axle (129) of the rear wheel (127);

wherein the drive system (200) comprises a motor shroud (201) and a driven pulley (204),

wherein the driven pulley (204) is rigidly supported on the motor shroud (201) by a plurality of mounting lugs (201a) and a plurality of fasteners (208).

2. The drive system (200) of claim 1, wherein the drive system (200) includes a one-way clutch (203), the one-way clutch (203) being coupled to an output shaft (141) of the internal combustion engine (140).

3. The drive system (200) of claim 1, wherein the motor shroud (201) is removably attached to a hub of the rear wheel (127) to cover the traction motor (150) from at least one side.

4. A drive system (200) for a hybrid vehicle (100), the hybrid vehicle (100) comprising:

an internal combustion engine (140); and

the internal combustion engine (140) is operatively connected to the motor (150) by the drive system (200),

wherein the drive system (200) comprises a motor shroud (201), a driven member (202), and a driven pulley (204),

wherein the motor shroud (201) is adapted to removably receive the driven member (202).

5. The drive system (200) of claim 4, wherein the motor shroud (201) includes a plurality of mounting lugs (201a) radially disposed along an outer surface thereof for receiving the driven member (202).

6. The drive system (200) of claim 5, wherein the motor shroud (201) includes a plurality of damping members (201b), and wherein each damping member of the plurality of damping members (201b) is positioned on each mounting lug of the plurality of mounting lugs (201 a).

7. The drive system (200) of claim 5 or 6, wherein the driven member (202) is removably attached to the plurality of mounting lugs (201a) of the motor shroud (201).

8. The drive system (200) of claim 4, wherein the driven pulley (204) is floatingly supported on the axle (129).

9. The drive system (200) of claim 4, wherein the drive system (200) includes a one-way clutch (203), and the one-way clutch (203) is housed in the driven member (202).

10. The drive system (200) of claim 9, wherein the driven pulley (204) includes a projecting sleeve member (204a), and in an assembled state of the driven pulley (204), the projecting sleeve member (204a) is held in contact with the one-way clutch (203).

11. The drive system (200) of claim 4 or 8, wherein the drive system (200) comprises a one-way clutch (203), the one-way clutch (203) being housed in the driven pulley (204).

12. The drive system (200) of claim 11, wherein the driven pulley (204) is disposed on an insert member (201c) that is cast with the motor shroud (201).

13. The drive system (200) of claim 11, wherein the driven pulley (204) is disposed on an insert member (201c) press-fit to the motor shroud (201).

14. A hybrid vehicle (100) comprising a drive system (200) according to any one of claims 1-13.