Bicycle bottom bracket

FIELD: transport engineering; bicycles; foot crank mechanisms.

SUBSTANCE: left-hand crank 3 is provided with square hole for mounting on shaft 1 and cylindrical groove with thread mating with hollow bolt 2 freely fitted on shaft 1. Said bolt thrusts through its left-hand end face surface against support bead of shaft. With left-hand crank 3 tightened by hollow bolt 2, shaft 1 is fitted in bearing unit, and left-hand bearing 8 prevents turning out of hollow bolt 2. Thread is made on outer surface of shaft 1 from right-hand side of shaft on which union nut 4 is installed to support right-hand bearing 9. Body of nut is made in form of cylindrical bushing of which driving sprockets 5 are mounted for free rotation. Bead of union nut 4 limits axial displacement of sprockets 5. Groove with thread is made in sprocket hub 6, and thread is made on outer surface of hub of right-hand crank 7 to provide possibility of tightening of right-hand crank 7 provided with square hole for mounting on shaft 1 by freely rotating hub 6 of sprockets which plays the part of nut.

EFFECT: prevention of spontaneous turning out of bottom bracket parts, provision of sealing of bottom bracket.

5 cl, 2 dwg

 

The invention relates to the production of bicycles and, in particular, racing bicycles.

For racing bikes fundamental requirements for structural elements is providing the specified operating characteristics that must continuously maintain in the progress of the race. Another important requirement for the design of the bike is the provision of high technology of its manufacture and Assembly.

Known carriage racing bike adopted for the prototype, consisting of two nodes: ball bearing hub and crank system (Lubowicki VP Racing bikes. - Leningrad: Mashinostroenie, Leningrad branch, 1989, p.64-69). Ball bearing node carriage includes a shaft, the left and right cups, which are installed on the thread in the body frame of the bike and with the shoulder of the shaft form a ball tracks, which are located in bearing balls. The axial position of the Cup is fixed by nuts. Crank the system consists of left and right cranks, the two leading stars, connected with the legs of the right crank screws through the spacers. The cranks are attached to the shaft of the carriage on the mating wedge surfaces of the square hole with screws with washers.

Mount the cranks by means of bolts leads to periodic weakening of C is heavy and the emergence of a backlash, which lead to axial oscillation of the cranks, which dramatically reduces the dynamic characteristics of the bike. The adjustments mounting cranks in the process of races is virtually eliminated due to the irreparable loss of time.

Loosening of the screws securing the leading asterisks to the legs of the right crank also leads to radial runout of the drive sprocket, which also reduces the dynamic characteristics of the bike. The adjustments of the attachment of the leading stars in the process of races is also virtually eliminated.

To manufacture parts ball bearing host and assembling them to meet high requirements for strength, durability and precision, resulting in a decrease in workability. The optimal size of the ball tracks is controlled by axial displacement of the cups of carving and fixing them with a locknut, which reduces the operational characteristics of the bike, as periodically happens weakening backwater cups and appears backlash, which increases the frictional resistance ball bearing node and reduces the speed of the bike. The adjustments directly in the course the race is almost impossible as it may lead to irretrievable loss of time.

In addition, the presence of through-holes in the hubs cranks leads to the ingress of dust and moisture is between the mating mounting surfaces of the hollow sleeve and cranks, that reduces the service life of the structure. Install protective caps occasionally fall and installed again only in the intervals between the races.

The technical result of the proposed technical solution to improve the performance of the bike by eliminating inadvertent loosening of fasteners carriage during operation, simplifying the design, increasing the structure's life by providing a tight seal within the coupling parts.

The technical result is ensured by the fact that in the carriage of bicycles, including ball-bearing hub, mounted on a Bicycle frame and having a shaft and two bearings, and the crank system having left and right cranks mounted on the shaft to fit in the square hole, and leading asterisks, United with the right crank, on the left side of the support shaft collar on the shaft freely mounted hollow bolt so that its left end surface abuts against the abutment shoulder of the shaft, and the right end surface of the back case of the left bearing. In the hub of the left crank on the inner side is made cylindrical groove with thread, on which the hollow bolt left crank is fixed on the shaft in the square hole. This axial movement of the hollow bolt into the process the e torque is selected to ensure fixation of the hub of the left crank without a gap, by providing the necessary clearance between the hub of the crank and the frame of the bike and ensuring backwater of the left bearing. The shaft Assembly with the left crank and bearing Assembly is mounted in the frame of the bike. On the right side of the shaft on the outer surface of the executed thread, which, with the possibility of backwater corps right bearing mounted swivel nut, the body of which is made in the form of a cylindrical sleeve with a flange having a cylinder wrench. Leading asterisks right crank combined with solid hub, which is on the outer side has a cylindrical groove on the lateral surface of which is threaded. The leading hub of the sprocket is installed on the cylindrical surface of the Union nut with the possibility of free rotation, and the position of the leading hub of the sprocket to the shaft axis to provide the necessary clearance between the hub of the sprocket and the frame of the bike is fixed with flange nut which abuts on the bottom of the groove of the hub of the leading stars. The hub of the right crank on the outer surface is threaded, which by free rotation of the hub leading stars, performing the function of a nut, a crank fixed on a hollow shaft square hole. This to the Alenia crank on the right thread coincides with the direction of rotation of the rider pedals the Bicycle, thereby, provides a constant back pressure threaded connection of the right crank and the hub of the leading stars, and backwater position of the bearings and the hollow bolt that connects the left crank, eliminating the weakening of the connections and the possibility of backlash.

Advanced wheel sprocket with hub made in the form of monolithic parts, which eliminates the likelihood of the runout of the leading stars and, therefore, is to improve the operational characteristics of the bike.

To improve manufacturability and reliability in design ball bearing site instead of ball bearings, representing a team of construction with low manufacturability and Assembly and low operational reliability, it is proposed to install one-piece standard bearings, which are mounted in a Bicycle frame and fixed relative to the axis of the shaft with spacers, eliminating the need for adjustment of bearings during Assembly of the bike, and in the process of operation.

To increase the service life of carriage by eliminating dust and moisture between the mating mounting surfaces of the shaft and cranks landing square hole in the crank is made deaf.

To assure manufacturability con is e.g. by reducing demands for precision parts manufacturing carriage between the mating surfaces of the support shaft shoulder and the hollow bolt and between the mating surfaces of the hub of leading stars and nut installed shims that defines the required clearances between the left crank and the housing to the Bicycle frame and wheel hub leading asterisks and frame and to provide the required back pressure bearings.

Distinguishing features of the proposed device is that the left side of the shaft of the support collar and the shaft freely mounted hollow bolt that the left end surface abuts against the abutment shoulder and the right end surface of the back case of the left bearing, on the right side of the shaft on the outer surface of the executed thread, which, with the possibility of backwater corps right bearing mounted swivel nut, the body of which is made in the form of a cylindrical sleeve with a flange, and the hub of the left crank on the inner side is made cylindrical groove with thread, on which the hollow bolt left crank mounted on the shaft, leading asterisks the right crank combined with a monolithic hub that is installed on the cylindrical surface of the Union nut with the possibility of free rotation, and in the hub of the leading stars on the outer side is made a groove so that the flange nut is mated with the bottom of the groove and locks leading asterisks in a predetermined position relative to the axis of the shaft and the side surface of the faithful is his and the outer surface of the hub of the right crank are threaded, through which the hub of the leading stars, performing the function of the nut is connected with the right crank.

An additional characteristic of the invention is that the wheel sprocket to the hub is a monolithic part.

Another additional characteristic of the invention is that the multi site includes two standard bearing installed in a Bicycle frame through a spacer.

The following additional characteristic of the invention is that the landing square hole in the crank is made deaf.

Furthermore, an additional characteristic of the invention is that between the mating surfaces of the support shaft shoulder and the hollow bolt and between the mating surfaces of the hub of leading stars and cap nut installed shims.

The invention is illustrated by drawings, where figure 1 shows the carriage of bikes on the side view in section, and Fig 2 shows the section a-A.

The carriage of a Bicycle includes a shaft 1, which is freely rotatably mounted hollow bolt 2, which mate with the supporting flange of the hollow shaft. The left crank 3 in square hole mates with the shaft 1 and through the threaded connection is fixed hollow bolt 2. On the right side of the shaft 1 and the outer surface is rnost made the thread, which is set Union nut 4. Leading asterisks 5 combined with solid hub 6. The leading hub of the sprocket 6 is installed on the cylindrical surface of the Union nut 4 with the possibility of free rotation, and the hub on the outer side is made a groove so that the flange nut is mated with the bottom of the groove and locks the wheel sprocket 5 in a predetermined position relative to the axis of the shaft 1. The lateral surface of the groove of the hub of the leading stars 6 are threaded, which is mate with the external threads of the hub of the right crank 7.

Leading asterisks 5 and the leading hub of the sprocket 6 is made as a single monolithic part.

On the shaft 1 are standard bearings 8 and 9, the relative positions of which relative to the axis of the shaft 1 and the Bicycle frame 10 is defined with a bushing 11. The left bearing housing 8 built hollow bolt 2, and the case of the right bearing 9 built locking nut 4.

Additionally, the carriage of bicycles contains the shim 12 is installed between the mating surfaces of the support flange and hollow shaft 1 bolt 2, and the shim 13 is installed between the mating surfaces of the hub leading sprocket 6 and the Union nut 4.

The carriage of bicycles is as follows. Have been fitted the second square section of the left part of the support shaft 1 left crank arm 3 is rigidly fixed with the hollow bolt 2 relative to the axis of the shaft 1. When the rotation of the pedals by the rider left crank 3 through the square coupling transmits torque to the shaft 1. The twisting of the hollow bolt 2 from the threaded connection with the left crank 3 as it rotates prevents the left bearing 8, which is backed by the state through the installation in the operating position of the Union nut 4, which is rigidly fixes the position of the bearings 8 and 9, and the spacer sleeve 11 relative to the Bicycle frame 10. Setting the desired position of the leading stars 5 relative to the axis of the shaft 1 is the selection of the geometric dimensions of the annular groove of the hub of the leading stars 6 and flange nut 4. This setup ensures free rotation of the hub leading stars 6 relative to the cylindrical surface of the Union nut 4 and relative to the Bicycle frame 10. The right crank 7 is installed on the square section of the right part of the support shaft 1 and is rigidly fixed by means of the threaded connection on the side surfaces of the grooves in the hub of the leading sprocket 6 and the outer surface of the hub of the right crank 7. This hub is the leading stars 6 plays the role of a nut, rotating which when the carriage Assembly, the right crank occupies the desired position. When the rotation of the pedals by the rider right crank arm 7 through the square coupling transmits torque is oment on the shaft 1 and coupled with it the hub of the leading stars 6, and since the direction of the threads in the hub 6 and the direction of rotation of the right crank arm 7 are the same, the right crank arm 7 together with the hub of the leading stars is a permanent rigid connection with the shaft 1, except the appearance of the backlash during operation.

The Association of leading stars 5 with the leading hub of the sprocket 6 in a single monolithic piece exclude the change in the rigidity of the leading stars in the process of operation, and therefore, eliminates run out of stars.

Bearing unit, comprising a one-piece standard bearings 8 and 9, located in the Bicycle frame 10, occupy a stable position relative to the shaft 1 by installing spacers 11 and backwater left bearing 8 hollow bolt 2, and the right bearing 9 Union nut 4. This arrangement eliminates the presence of backlash in the operation.

Execution deaf square holes in the hubs of the left 3 and right 7 cranks prevents the ingress of dust and moisture between the mating mounting surfaces of the shaft 1 and the cranks 3 and 7.

Install thrust washer 12 between the mating surfaces of the support flange and hollow shaft 1 bolt 2 allows the Assembly to install the required gap between the left crank 3 and the frame of the Bicycle 10, as well as to choose the backlash in the coupling of the left crank 3 with l the howling part of the shaft 1 with the provision of backwater hollow bolt 2 left bearing 8. Install thrust washer 13 between the mating surfaces of the cap nut 4 and the hub of the leading stars 6 allows to provide apparatus of the right bearing 9, the spacers 11, the left bearing 8 and the hollow bolt 2 relative to the surface of the shaft 1, by preventing backlash in the coupling of the left crank 3 with the shaft 1, and also provides the necessary clearance between the leading hub of the sprocket 6 and the frame of the Bicycle 10.

1. The carriage of bicycles, consisting of a ball bearing hub and crank system, where multi node carriage is mounted on a Bicycle frame and includes a shaft and two bearings, and the crank system includes left and right cranks mounted on the shaft to fit in the square hole, and leading asterisks, United with a right crank, wherein the left side of the shaft of the support collar and the shaft freely mounted hollow bolt that the left end surface abuts against the abutment shoulder and the right end surface of the back case of the left bearing, on the right side of the shaft on the outer surface of the executed thread, which, with the possibility of backwater corps right bearing mounted swivel nut, the body of which is made in the form of a cylindrical sleeve with collar and crank system in the hub of the left crank with NR the inner side is made cylindrical groove with thread, which hollow bolt left crank mounted on the shaft, leading asterisks right crank combined with solid hub, which is installed on the cylindrical surface of the Union nut with the possibility of free rotation, and in the hub of the leading stars on the outer side is made a groove so that the flange nut is connected with the bottom of the groove and locks leading asterisks in a predetermined position relative to the axis of the shaft and the side surface of the groove and the outer surface of the hub of the right crank are threaded, by means of which the hub is the leading asterisks, acting as a nut, is connected with the right crank.

2. The carriage of a Bicycle according to claim 1, characterized in that the leading sprocket with hub made in the form of monolithic details.

3. The carriage of a Bicycle according to claim 1, characterized in that the ball bearing node includes two bearings mounted in the frame of the bike through the spacer.

4. The carriage of a Bicycle according to claim 1, characterized in that the planting square hole in the crank is made deaf.

5. The carriage of a Bicycle according to claim 1, characterized in that between the mating surfaces of the support shaft shoulder and the hollow bolt and between the mating surfaces of the hub of leading stars and cap nut installed shims.



 

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