KR20220081170A - Variable crank - Google Patents

Abstract

The present invention is a variable crank, which, to be described in more detail, is intended to provide a variable crank having an improved structure in a variable crank configured to vary the pedal length of a bicycle. In the variable crank (C) whose length is variable,
a locking groove (106-1) formed in the rim of the fixed gear (106) coupled to the male and female assembly pipe (5) of the bicycle;
A locking protrusion 41 fitted to the locking groove 106-1 is formed on the inside, and a female screw hole 42 is formed on the side so that the assembly pipe 5 can be fixed with a fixing screw 43. of the anti-loosening means (4);
This is included, characterized in that the fixed gear 106 is prevented from being loosened from the assembly pipe 5 by the loosening prevention means 4, and maintenance is convenient and the lifespan is prolonged by this invention It is an invention that can be expected to have many effects.

Description

Variable crank

The present invention relates to a variable crank, which, in more detail, is configured so that the pedal length of a bicycle is variable.

In general, a bicycle is a vehicle in which a person directly steps on a pedal to generate rotational force, and various technologies have been developed to generate a higher efficiency driving force with less manpower in the bicycle.

Among them, there is an invention for a variable pedal driving device for a bicycle as disclosed in Republic of Korea Patent No. 0348598 (announced on August 13, 2002) as a technology of the same applicant as the present invention.

In a bicycle driven by driving a pedal, the distance between the pedal shaft and the pedal of a chain sprocket that transmits the rotational force of the pedal to the rear wheel is extended during driving, so that the maximum driving energy can be obtained with the minimum consumption of driving energy. It relates to a variable pedal driving device for a bicycle, comprising: a chain sprocket shaft-coupled to a pedal shaft inside both flanges of a frame; a rotating body integrally rotatably coupled to both flanges; A rotating disc coupled to an eccentric shaft, a guide pipe that is slide-coupled with an operation bar coupled to both ends of the pedal shaft outside the flange, and is fixed to the rotating body with a shaft pin so that the distance between the pedal shaft and the pedal is variable when the pedal shaft is rotated for driving; , is installed between the rotating disc and the frame to fix the rotating disc on the frame, and is composed of an adjustment means for arbitrarily adjusting the installation angle of the rotating disc.

Therefore, the length of the protrusion of the driving bar provided on the bicycle pedal is variable, and the length of the crank arm is maximized when the pedal is pressed, so that the size of the crank arm can be reduced while maximizing the driving force by actively utilizing the principle of the lever.

However, when the above technology was applied to practice, several areas for improvement were found.

It is shown in FIG. 1 of the present invention for explanation of some components of the prior art, and the reference numerals of the prior art described in FIG. 1 are applied as they are below.

First, in the crank configuration, the drive bar 113 and the connecting arm 114 are installed on a piece so as to face each other from one side, and the drive bar 113 and the connecting arm 114 are installed so that force is applied in different directions to move angularly. The piece may be damaged due to shearing force.

Second, a pair of angle flat cages of an angular shape are inserted to face each other as a bearing 116 on the inside of the drive case 108, and the flat cage is inserted into the drive case 108 while using the bicycle, that is, the connection arm 114 ) may have a problem of interfering with the connecting arm 114 by falling inside the configured.

Third, when the case cover protecting the durable components such as the connecting arm 114 and the connecting link 112 is coupled to the driving case 108, it is not watertight or waterproof, so it invades into the driving case 108 and internal components There could be a problem with this corrosion or foreign matter being deposited.

Fourth, in the drive case 108, the drive bar 113 is coupled to the outer side of the sliding drive case 108 to prevent moisture or foreign substances from entering the end cap is coupled by a piece, the end cap made of metal is Consumables should be replaced during maintenance, and replacement was only possible by disassembling all of the internal components of the drive case 108 during replacement, and there could be an unnecessary process of reassembling the entire crank again.

Fifth, the fixed gear 106 is fastened to the assembly pipe 105 by male and female helical coupling and is fixed. Accordingly, there may be a problem in that the fixed gear 106 is slowly released from the assembly pipe 105 .

Therefore, in the present invention, it was intended to invent an additionally improved technical configuration to solve the above problems.

KR 10-0348598 B1 (2002.08.13.)

In the present invention, a new technology has been devised to solve the problems of the prior art, and to explain this in more detail, in the variable crank configured to change the pedal length of a bicycle, it has an additional effect to solve the problems of the prior art. It is an object of the present invention to provide a variable crank having a more improved structure by further comprising components.

Although not separately described, other objects within the scope that can be inferred in consideration of the specific contents and claims for carrying out the following invention are also included in the overall task of the present invention.

As a specific means for solving the problems of the present invention, in the present invention, in configuring the variable crank, in the variable crank in which the length of the pedal is variable, a cutout is formed in the middle of the other end of the driving bar to which the pedal is coupled to one end It may be characterized in that the connection arm is interposed in the cutout and configured to rotate so as to increase durability.

In the variable crank in which the length of the pedal is variable, it is attached to the inner opening of the drive case, the inner drive hole through which the drive bar passes and slides is formed, and the release preventing sill that prevents the bearing inserted in the drive case from being detached is formed. It may be characterized in that the prevention means is included.

In addition, a case cover configured to be detached from the driving case, a cover waterproofing means attached to the edge of the case cover to be interposed between the driving case and the case cover to prevent foreign matter from penetrating into the driving case, and the inside of the case cover. It may be characterized in that a pressing protrusion for closely pressing the separation preventing means to the inner opening is included.

In the variable crank in which the length of a pedal is variable, a soft coupling groove formed in a circumferential direction at an outer opening of a driving case, a coupling protrusion protruding inward to be caught in the coupling groove, and an outside driving hole through which the drive bar slides are formed It may be characterized in that the end watertight means is included to prevent foreign matter from penetrating into the driving case.

In the variable crank with variable pedal length, a locking groove formed on a rim of a fixed gear coupled to a male and female assembly tube of a bicycle, and a locking protrusion fitted to the locking groove are formed on the inside, and the assembly tube is fixed with a fixing screw An annular anti-loosening means formed on the side of the female threaded hole is included to prevent loosening of the fixed gear from the assembly pipe by the anti-loosening means.

According to the specific means for solving the above-mentioned problems, the structure in which the driving bar and the connecting arm are coupled is improved to increase the durability of the driving bar and the connecting arm, and the rotating piece connecting the two components to move angularly.

By preventing the penetration of moisture, moisture, and foreign substances into the driving case, corrosion of durable components or stacking of foreign substances is prevented, thereby prolonging the lifespan of the variable crank.

In addition, in particular, by improving the fixability of the fixed gear, the expected effect such as significantly lowering the variable crank failure rate and increasing the operation reliability is a great invention.

1a to 1b is an exploded three-dimensional view of a conventional variable crank
2 is a three-dimensional view showing an example of the present invention;
3 is an isolated three-dimensional view showing an example of the present invention;
4 is a plan view showing a cut-out portion of the prior art and the present invention, respectively;
5 is a plan cross-sectional view showing the separation preventing means of the present invention;
Figure 6 is a side cross-sectional view showing the separation preventing means of the present invention;
Figure 7 is a side cross-sectional view showing the loosening prevention means of the present invention

The present invention is intended to provide a variable crank, which will be described in more detail with the drawings below, and the accompanying drawings are merely examples for easily explaining the content and scope of the technical idea of the present invention. This is not the case, and the terms used are only for specifically describing the embodiment, and should not be construed as being limited to the term.

In the variable crank (C) in which the length of the pedal is variable as shown in FIGS. 2 to 3, the variable crank (C) of the present invention described above is the other end of the driving bar 113 to which the pedal is coupled to one end. A cutout 113a is formed in the center, and a connection arm 114 is interposed in the cutout 113a to be connected to rotate, thereby increasing durability.

In the variable crank (C) in which the length of the pedal is variable, the inner driving hole 22 is attached to the inner opening 108b of the drive case 108 and the drive bar 113 passes through and slides therein. It may be characterized in that a separation preventing means (2) having a separation preventing protrusion (21) for preventing the bearing (116) inserted into the driving case (108) from being separated is included.

In addition, the case cover 108-1a configured to be detachably from the driving case 108, and attached to the edge of the case cover 108-1a to be interposed between the driving case 108 and the case cover 108-1a. The cover waterproofing means 108-1b for preventing foreign matter from penetrating into the driving case 108, and the separation preventing means 2 from inside the case cover 108-1a, are pressed in close contact with the inner opening 108b. It may be characterized in that the pressing protrusion (108-1c) is included.

In the variable crank (C) of which the length of the pedal is variable, the coupling groove (31) formed in the circumferential direction in the outer opening (108a) of the driving case (108) and the coupling protruding inward to be caught in the coupling groove (31) The protrusion 32 and the soft end watertight means 3 formed with the outer driving hole 33 through which the driving bar 113 passes and slides are included to prevent foreign matter from penetrating into the driving case 108 . It may be characterized in that it is prevented.

In the variable crank (C) in which the length of the pedal is variable, a locking groove (106-1) formed in the rim of a fixed gear (106) coupled to the assembly tube (5) of a bicycle, the locking groove (106-1), and the locking groove (106-) 1) a locking protrusion 41 to be fitted to the inside is formed, and an annular loosening preventing means (4) having a female screw hole (42) formed on the side so that the assembly pipe (5) can be fixed with a fixing screw (43) ) may be included to prevent the fixed gear 106 from being loosened from the assembly pipe 5 by the loosening prevention means 4 .

Looking at the configuration in more detail along with the action is as follows.

As previously cited in the background art, in a bicycle having a variable crank (C) in which the degree of protrusion of the pedal varies according to the position at which the pedal rotates according to the prior art inventor, various configurations are added to prevent some problems that may occur in advance. It was meant to be prepared.

Looking at the prior art for a moment, Fig. 1a is a three-dimensional view showing a pedal driving unit in the prior invention, Fig. 1b is a cross-sectional view of Fig. 1a in the coupled state, the assembly tube 105 is inserted into the shaft hole 73 of the frame 1, The assembly pipe 105 is coupled to both sides of the fixed gear 106 to the assembly pipe 105 through the screw coupling part 107 to shaft-couple the pedal shaft 3a to the inside of the assembly pipe 105 . Then, both ends of the pedal shaft 3a are fixedly coupled with a fixing bolt 109 or the like after coupling the driving case 108 to the outside of the assembly pipe 105, both sides of the fixed gear 106, and fixing the both ends of the assembly pipe 105 The gear 106 is gear-coupled to the planetary gear 110 rotatably installed on one side (the rear side based on the traveling direction) of the driving case 108 as a bearing 116, and the shaft portion 110a of the planetary gear 110. To connect the connecting link 112 in a free rotation state. In addition, the end of the connecting link 112 is connected to the connecting arm 114 of the driving bar 113 slide-coupled to the inside of the driving case 108, and the chain sprocket 4 is fixed to one side of the driving case 108 to be installed. The installation member 115 is coupled to enable it. In the above, the driving bar 113 slide-coupled to the driving case 108 is composed of a substantially rhombic tetrahedron to ensure excellent bending strength. By coupling the bearing 116 of approximately > type toward the edge, smooth sliding operation is achieved. In the above, the mutual gear ratio between the fixed gear 106 of the assembly pipe 105 and the planetary gear 110 of the driving case 108 may be variously implemented such as 2:1 or 1:1, and between these When the ratio is 2:1, the planetary gear 110 coupled to the fixed gear 106 rotates twice about the fixed gear 106 during one rotation of the driving case 108, so that the driving case 108 is rotated twice. ), the pedal that slides forward and backward from it makes a circular rotational motion, and when the gear ratio between them is 1:1, the planetary gear coupled with the fixed gear 106 during one rotation of the drive case 108 ( 110) also rotates once around the fixed gear 106, so that the pedal that slides forward and backward from the driving case 108 performs a long elliptical rotational motion in the moving direction.

As shown in FIG. 4(A), when the driving bar 113 and the connecting arm 114 are axially installed on the rotating piece 114a to face each other from one side during the crank configuration as in the prior art, the driving bar ( Since the 113) and the connecting arm 114 are not facing each other but are in contact with each other, the force of the driving bar 113 and the connecting arm 114 is the rotation piece when the force of the person who steps on the pedal is transmitted. (114a) is applied in different right directions, causing shear force to occur in the rotating piece 114a, and it may be damaged or the drive bar 113 and the connecting arm 114 may be damaged due to misalignment. Therefore, in the present invention, as shown in (B) of FIG. 4 , a cutout 113a is formed at the end inserted into the drive case 108 from the drive bar 113, and is connected to the cutout 113a. The arm 114 is configured to be interposed, and the driving bar 113 and the connection arm 114 may be configured to move angularly as a connection piece.

When configured as described above, since the driving bar 113 supports the connecting arm 114 from both sides, there is no misalignment between the driving bar 113 and the connecting arm 114, and the pivoting piece 114a. The direction of the force transmitted to the device is also to be transmitted uniformly without biasing to one side, thereby increasing stability and durability.

As shown in FIGS. 1A to 1B , the driving bar 113 is inserted and slid inside the driving case 108 , and between the driving bar 113 and the driving case 108 to minimize the frictional force of the driving bar 113 . The bearing 116 is interposed.

In the bearing 116, a pair of angular flat cages of an angular shape are inserted to correspond to each other up and down. In the prior art, there was no configuration for fixing the bearing 116, so there was a problem of falling out, and the falling bearing 116 is a driving bar ( 113) was likely to interfere with the connection arm 114 coupled to rotate, and in the present invention, the separation preventing means (2) was further provided.

The separation preventing means 2 has an inner driving hole 22 through which the driving bar 113 slides through, so that only the driving bar 113 passes through, and the inner driving hole 22 is as shown in FIG. 5 . Since it is formed smaller than the size of the bearing 116, the bearing 116 is not caught and does not come off, and the rim of the separation preventing means 2 is formed larger than the size of the bearing coupling hole 108c to which the bearing 116 is coupled and is separated. Preventing means (2) from entering into the bearing coupling hole (108c).

Therefore, as the separation prevention means (2) is further provided, the bearing 116 is prevented from being separated to maintain durability of each component, thereby prolonging the lifespan.

As shown in FIGS. 1A to 2 , internal components such as the connection arm 114 and the connection link 112 installed inside the driving case 108 are assembled or detached from the driving case 108 when maintenance is required. The case cover (108-1a) is constituted, and due to the nature of the bicycle mainly used outdoors, there may be a weakness in which moisture, rainwater, various foreign substances, etc. penetrate.

Therefore, as shown in FIG. 3, a cover waterproofing means (108-1b) made of a thin elastic material is further provided on the inner side of the case cover (108-1a) in the circumferential direction to prevent moisture or foreign substances from penetrating, and also from the outside. It also has the effect of increasing the lifespan of the variable crank (C) as if it attenuates the applied shock and prevents noise generation by preventing other vibrations during long-term use.

In addition to this, in the structure in which the case cover 108-1a is bolted to the driving case 108, the pressing protrusion 108- toward the inner opening 108b of the case cover 108-1a as shown in FIG. 1c) is further provided, the pressing protrusion (108-1c) presses the separation preventing means (2), the separation preventing means (2) can also serve to fix the inner opening (108b) in close contact, so that the separation The coupling of the prevention means (2) becomes easier, and there is no need for a separate adhesive or piece fixing to the separation prevention means (2), so assembly is facilitated during production.

An end for preventing the separation of the bearing 116 from the outer part of the driving case 108 on which the driving bar 113 slides from the driving case 108 and preventing moisture or foreign substances from penetrating into the driving case 108 at the same time. A watertight means (3) is provided.

As shown in FIG. 2 or 3, the end watertight means 3 has a coupling groove 31 formed in the outer opening 108a of the driving case 108 in the circumferential direction, and the end watertight means 3 is A coupling protrusion 32 corresponding to the coupling groove 31 is formed, and an outer driving hole 33 through which the driving bar 113 is slid is formed.

As the end watertight means 3 is made of a soft material such as rubber or silicone, it is in close contact with the drive bar 113 to minimize the gap between the drive bar 113 and the end watertight means 3 to penetrate moisture or foreign substances. to prevent

When maintenance of the end watertight means 3 is required, the end watertight means 3 is replaced. However, in the present invention, the end watertight means 3 is a soft material of synthetic resin such as soft rubber or silicone, and when only the pedal is separated from the pedal coupling part 113b, which is the end of the driving end, and pulled outward, the end watertight means ( As the shape of the outer driving hole 33 formed in 3) is deformed, it is possible to pass through the pedal coupling part 113b, so that the end watertight means 3 can be easily separated, and a new end watertight means 3 is combined. When doing this, it can be easily coupled by forcing the pedal coupling part 113b in the reverse order, and the coupling protrusion 32 of the end watertight means 3 is fitted into the coupling groove 31 of the driving case 108. Since it is provided as much as possible, there is an advantage that anyone can easily perform replacement work.

As one of the components for the operation of this variable crank (C), as shown in FIGS. 1A to 2 , the fixed gear 106 is fastened to the assembly pipe 5, which is the bicycle frame 1, by male and female helical coupling and fixed. has been

The fixed gear 106 may have a problem in that the fixed gear 106 is gradually loosened from the assembly pipe 5 due to the continuous influence of vibration and rotational force due to frequent transmission of rotational force with the planetary gear installed in the driving case 108. Therefore, in the present invention, as shown in FIG. 2, a locking groove 106-1 formed on the rim of the fixed gear 106 coupled to the male and female assembly pipe 5 of the bicycle is formed, and the locking groove 106-1 is formed. A locking protrusion 41 to be fitted on the inside is formed, and a female screw hole 42 is formed on the side so as to further provide an annular loosening preventing means 4 so that the assembly pipe 5 can be pressed and fixed with a piece. To prevent loosening of the fixed gear 106 from the assembly pipe (5) by the loosening prevention means (4).

As shown in FIG. 7 , the locking protrusion 41 protruding inward from the inner circumferential surface of the loosening preventing means 4 is caught corresponding to the locking groove 106-1 formed in the fixed gear 106, and the loosening preventing means 4 ), a set screw 43 is spirally assembled in one or more female threaded holes 42 formed in the , and fixed to the frame 1 such as the bicycle assembly tube 5 to prevent rotation of the fixed gear 106, thereby preventing the fixed gear. (106) to increase the fixability and improve durability.

The fixing screw 43 may be fixed by clamping the frame 1 from one side according to the tightening of the male and female helical coupling, or by further configuring the screw-in groove 44 in the frame 1, the fixing screw 43 is screw-in. It is also possible to further increase the fixability by being caught in the groove 44 .

As described above, in the detailed description of the present invention, the most preferred embodiment of the present invention has been described, but various modifications are possible within the scope not departing from the technical scope of the present invention. Therefore, the protection scope of the present invention is not limited to the above embodiments, but the protection scope should be recognized from the techniques of the claims to be described later and equivalent technical means from these techniques.

C: Variable crank
1: frame
105: Assembly Hall
106: fixed gear 106-1: locking groove
108: drive case 108a: outer opening 108b: inner opening 108c: bearing coupling hole
108-1a: case cover 108-1b: cover waterproofing means 108-1c: pressing protrusion
113: drive bar 113a: cutout 113b: pedal coupling part
114: connecting arm 114a: rotating piece 116: bearing
2: separation prevention means 21: separation sill 22: inner driving hole
3: End watertight means 31: coupling groove 32: coupling protrusion 33: outer driving hole
4: Loosening prevention means 41: Interlocking projection 42: Female thread hole 43: Fixing screw 44: Thread groove

Claims (5)

In the variable crank (C) which is installed on a bicycle and the length of the pedal is variable,
Installed in the drive case 108 of the variable crank (C), a cutout 113a is formed in the middle of the other end of the drive bar 113 to which the pedal is coupled to one end,
A variable crank, characterized in that the connection arm (114) is interposed in the cutout (113a) and configured to rotate so as to increase durability.
The method of claim 1 ;
It is attached to the inner opening 108b of the drive case 108, an inner drive hole 22 through which the drive bar 113 passes and slides is formed, and the bearing 116 inserted into the drive case 108 is detached. Departure prevention means (2) formed with a departure preventing sill 21 to prevent that;
Variable crank, characterized in that it is included.
3. The method of claim 2;
a case cover (108-1a) configured to be detached from the driving case (108);
Cover waterproofing means (108-) configured to be attached to the edge of the case cover (108-1a) to be interposed between the driving case (108) and the case cover (108-1a) to prevent foreign matter from penetrating into the driving case (108). 1b);
a pressing protrusion (108-1c) for closely pressing the separation preventing means (2) to the inner opening (108b) inside the case cover (108-1a);
Variable crank, characterized in that it is included.
The method of claim 1 ;
a coupling groove 31 formed in the circumferential direction in the outer opening 108a of the driving case 108;
A soft end watertight means 3 formed with a coupling protrusion 32 protruding inward so as to be caught in the coupling groove 31 and having an outside driving hole 33 through which the driving bar 113 slides through;
Variable crank, characterized in that it is included to prevent foreign matter from penetrating into the driving case (108).
The method of claim 1 ;
a locking groove (106-1) formed on the rim of the fixed gear (106) of the variable crank (C) coupled to the assembly pipe (5) of the bicycle;
A locking protrusion 41 to be fitted into the locking groove 106-1 is formed on the inside, and a female screw hole 42 is formed on the side so that it can be fixed to the assembly pipe 5 with a fixing screw 43. of the anti-loosening means (4);
Variable crank, characterized in that it is included to prevent the fixed gear (106) from being loosened from the assembly pipe (5) by the loosening preventing means (4).

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