Abstract:
A clutch-lever manipulation assisting device includes an input member coupled to a side of a clutch lever, an output member connected to the input member via a connection device and coupled to an operated member of a clutch, and a biasing device that assists a manipulating force by the clutch lever. The connection device is constructed such that a ratio of a moved amount of the output member to a moved amount of the input member varies during a clutch operation.
Abstract:
A friction clutch has a clutch housing including a friction plate, a clutch boss including a clutch plate, and a pressure plate causing the friction plate and the clutch plate to contact each other by moving in a predetermined direction. A clutch spring applies a biasing force in a direction of causing the pressure plate to press the friction and clutch plates into contact with each other. An annular retainer receives a reaction force to the biasing force of the clutch spring by supporting one end of the clutch spring opposite to the pressure plate. A circlip of a notched ring shape is fitted into an inner peripheral side of the clutch housing. The circlip locks the retainer to the clutch housing by abutting on an opposite side of the retainer. The retainer is configured to suppress radially inward deformation of the circlip when a vehicle engine is driven.
Abstract:
A clutch drive device includes an actuator for generating a drive force for driving a clutch, a first solid of revolution, a mechanism for transmitting the drive force of the actuator to the clutch, and an assist spring unit having one end pivotally supported and another end abutting on the solid of revolution. An abutment structure in which the first solid of revolution abuts on the assist spring unit is configured so that an urging force of the assist spring does not act in a direction of rotating the first solid of revolution at least at one position in a play area in which the clutch is not disengaged even if the first solid of revolution rotates.
Abstract:
Abrasion of a V-belt in a belt type continuously variable transmission accommodated in an engine unit of a motorcycle is suppressed. A V-belt wound around and contacting a primary sheave and a secondary sheave 72 is at least partially formed from a resin. A plurality of grooves aligned at a predetermined pitch in a radial direction are formed on sheave surfaces of the primary and secondary sheaves. The average pitch P(mm) of the grooves is P≦−0.08K×10−3+0.18, where K(Hv) indicates surface hardness of the sheave surfaces.
Abstract:
To enhance the durability of the V-shaped belt by allowing the strength and the heat-radiating property of the resin blocks to stand together at high levels in the V-shaped belt, which has a plurality of resin blocks and endless connecting members connecting the resin blocks. The V-shaped belt includes a plurality of resin blocks arranged in a direction and an endless connecting member that is impacted into the resin blocks and that extends in the arrangement direction of the resin blocks. Depressions are longitudinally and vertically formed in the upside and downside of the front surface and the rear surface of each resin block. The depressions are separated from the connecting member and are also separated from the lateral surfaces of the resin block.
Abstract:
A belt type continuous variable transmission comprises a primary sheave, a secondary sheave, and a belt. The primary sheave comprises a first sheave body, a second sheave body that forms between it and the first sheave body a belt groove, about which a belt is entrained, a plurality of push bodies that slide the second sheave body according to centrifugal forces to change a width of the belt groove, and a plurality of stoppers that restrict movements of the push bodies by contacting with outer surfaces of the push bodies when the second sheave body reaches a position of minimum transmission gear ratio, in which the belt groove is made smallest in width. The stoppers are shaped to accelerate partial wear of the outer surfaces of the push bodies.
Abstract:
A clutch 44 has a clutch boss 441, a clutch housing 442, a friction plate 64, a clutch plate 65, and a pressure plate 450. The clutch boss 441 is attached to the main shaft 41 so as to be integrally rotated therewith. The clutch housing 442 encloses the periphery of the clutch boss 441 and is attached to the main shaft 41 so as to be rotated with respect to the main shaft 41. The friction plate 64 has a plate main body and a friction material and rotates together with the clutch housing 442. The clutch plate 65 faces the plate main body via the friction material and rotates together with the clutch boss 441. The pressure plate 450 rotates together with one of the clutch boss 441 the clutch housing 442 which is engaged with the friction plate 64.
Abstract:
A friction plate (131) rotates in association with rotation of a pressure plate (77). A first pressing plate (132) presses the friction plate (131) to the right to move the pressure plate (77) to the right. A second pressing plate (133) receives a torque of the pressure plate (77) via the friction plate (131). A slide shaft (231) rotates together with the second pressing plate (133). The operation assist mechanism (220) gives a rightward force to the pressure plate (77), by the slide shaft (231) moving to the right upon receiving the torque from the second pressing plate (133). Balls (135) transmit a portion of the rightward force of the short push rod (43a) to the slide shaft (231) without use of the friction plate (131).
Abstract:
A noise suppressor for a straddle-type vehicle provided with a belt type continuously variable transmission having a resin-block-type belt. A portion of an air passage for guiding air to a belt chamber is formed in a closed casing. The closed casing includes a dish-shaped first casing member and a dish-shaped second casing member. An inlet port and an exhaust port are formed in the second casing member. Partition walls in the form of curved plate pieces are formed in the first casing and second casing members. Air flow paths formed by the partition walls are U-shaped, thereby forming a serpentine flow.
Abstract:
A belt-type continuously variable transmission (15) includes a primary sheave (29) having a pair of first clamp surfaces (37a, 37b), a secondary sheave (30) having a pair of second clamp surfaces (51a, 51b), and a belt (31) endlessly wound between both the sheaves (29, 30). The belt (31) has contact surfaces (58a, 58b) clamped between the first clamp surfaces (37a, 37b) and between the second clamp surfaces (51a, 51b). Powder (64) having infusibility as a friction enhancing material is held on at least one of the first clamp surfaces (37a, 37b) of the primary sheave (29), the second clamp surfaces (51a, 51b) of the secondary sheave (30), and the contact surfaces (58a, 58b) of the belt (31).