JPH0547031Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This idea concerns the structure of the bicycle hanger.
Specifically, the present invention relates to a structure of a hanger configured to allow lubricating oil to be injected without disassembling the hanger and to prevent lubricating oil from leaking out of the hanger pipe.

[Conventional technology]

A bicycle hanger is a part that rotatably supports a crankshaft, which has pedal cranks on both ends and a front gear on one side, relative to the bicycle frame. We are prepared. That is, a hanger pipe 1 having an axis extending in the left-right direction is formed at the lower part of the seat pipe of the bicycle frame, and a crankshaft 4 is rotatably supported within the hanger pipe 1 via a pair of left and right bearing parts 2 and 3. There is. Ball bearing surfaces 5 and 6 curved in an arc shape in cross section are formed on the left and right outer peripheries of the portion of the crankshaft 4 that is inserted into the hanger pipe 1, and the bearing portions 2 and 3 Receiving surface 5,
6 and ball receiving surfaces 9, 10 on the inner periphery of the rings 7, 8 screwed from the outer end of the hanger pipe 1, a plurality of steel balls 11... are held under pressure so as to be able to roll. be done. Of the above-mentioned ones 7 and 8, the one on the right side is usually
The outer periphery is provided with a male thread 13 corresponding to the female thread 12 on the inner periphery of the hanger pipe 1, the outer end is provided with a flange portion 14 that can come into contact with the outer end 1a of the hanger pipe 1, and the inner periphery is provided with the above-mentioned ball receiving surface 9. On the other hand, the left-hand one 8 has approximately the same shape as the right-hand one 7, but there is no flange at the outer end, and a male thread 16 on the outer periphery is formed all the way to the outer end. In addition, a through hole 15 at the outer end through which the crankshaft 4 passes.
The inner diameter of the crankshaft 4 is slightly larger than the outer diameter of the crankshaft 4. To assemble this hanger, first screw the right one 7 onto the right end of the hanger pipe 1.
Then, the crankshaft 4 is passed through from the left side while inserting the steel balls 11..., and then the left one 8 is inserted so that the steel balls 11... into the left end of the hanger pipe 1, finely adjust the distance between the left and right wheels 7 and 8 to match the rotation of the crankshaft 4, and then
Screw the lock nut 17 onto the male thread 16 of the hanger pipe 1 so that it touches the left end of the hanger pipe 1.

[Problem that the invention attempts to solve]

In the conventional hanger structure, when applying lubricating oil after assembling the hanger set to the bicycle,
The crankshaft 4 and left and right one 7 shown in FIG.
The only way to do this is to inject lubricating oil through the annular gap between the hole 15 and the through hole 8, or disassemble the hanger and supply lubricating oil. In this case, the method of injecting lubricating oil through the annular gap described above has a very small gap.
Because there is an annular gap located along the outer periphery of the crankshaft 4 having a horizontal axial direction and having a vertical radial direction, the injected lubricating oil may flow down along the outer periphery of the crankshaft 4. The lubricating oil must be injected by tilting the crankshaft 4 so that the axial direction of the crankshaft 4 has an angle of inclination with respect to the horizontal direction. Even in this case, it is difficult to inject an appropriate amount of lubricating oil into the inside of the hanger. Have difficulty. Furthermore, in the method of disassembling the hanger portion and supplying lubricating oil, which is inevitably selected for the above-mentioned reasons, the disassembled right and left wangs 7 and 8 must be reattached to both ends of the hanger pipe 1. The work of finely adjusting the spacing between the left and right ones 7, 8 and screwing them onto both ends of the hanger pipe 1 is to find the optimal position of the bearing parts 2, 3 that support the crankshaft 4 while receiving a large radial load. It also has the purpose of determining and obtaining the optimum rotational performance to smoothly rotate the crankshaft 4. This work requires considerable skill and time, and if a person other than an expert performs the above work, the bearing part 2,
It is very difficult to obtain the optimum rotational performance of the crankshaft 4, and if this adjustment is inappropriate, the smooth rotation of the crankshaft 4 will be impaired, and an appropriate amount of radial load will not act on the bearings 2 and 3. This adversely affects the durability of the bearing parts 2 and 3. On the other hand, in the structure of the conventional hanger part, the above-mentioned annular gap is inevitably formed between the inner periphery of the through hole 15 through which the crankshaft 4 of the left and right ones 7 and 8 should pass, and the outer periphery of the crankshaft 4. The lubricating oil supplied when the hanger is assembled leaks, resulting in an extreme drop in lubrication performance and difficulty in maintaining a constant lubrication performance over a long period of time, impairing the smooth rotation of the crankshaft 4. This idea was devised under the above circumstances, and enables easy supply of lubricating oil to the inside of the hanger without disassembling the hanger, and prevents lubricating oil from going outside of the hanger. To provide a hanger structure configured to prevent leakage, prevent extreme deterioration of lubrication performance, maintain constant lubrication performance for a long period of time, and maintain smooth rotation of the crankshaft 4. That is the issue.

[Means to solve the problem]

In order to solve the above problem, this invention takes the following technical measures. That is, the present invention allows the crankshaft inserted through the hanger pipe to be connected to a ball receiving surface formed on the inner periphery of the one screwed to both ends of the hanger pipe, and a ball receiving surface formed on the crankshaft. a hanger part rotatably supported through left and right bearing parts having steel balls rotatably interposed therebetween, and having a seal for sealing a gap between the crankshaft and the one; The one has an outer wall portion having a through hole through which the crankshaft is inserted, and a threaded cylindrical portion extending axially inward from a peripheral portion of the outer wall portion, and the threaded cylindrical portion is arranged inside the hanger pipe. a one body which is screwed onto the one body; and a one body which is attached to the one body so as to fit into the inner periphery of the threaded cylinder portion on the inner surface of the outer wall portion of the one body, and has the ball receiving surface on the inner periphery. a ball receiving member, and an annular space is provided between the inner surface of the outer wall of the one body and the ball receiving member by forming a chamfer on the entire outer edge of the outer peripheral portion of the ball receiving member. On the other hand, a plurality of radial grooves communicating with the annular space are provided on the outer end surface of the ball receiving member or the inner surface of the outer wall of the one body, and the outer wall of the one body is penetrated from the inside and outside, and By providing a through hole that communicates with the annular space, a passage is formed from the entrance of the through hole to the inside of the seal via the through hole, the annular space, or the radial groove; The inlet is sealed with a removable stopper.

[Effect]

In the present invention, in the structure of the hanger part that has a seal for sealing the annular gap between the crankshaft and the one, a passage is provided that penetrates from the inlet opened in the outer wall of the one to the inside of the seal. A removable plug closes the entrance of the passage. Therefore, when the plug is attached to the entrance of the passage, the inside of the hanger is almost sealed, but by removing the plug, the inside and outside of the hanger are communicated through the passage. be done. Moreover, the above-mentioned passage in the present invention is particularly constructed as follows. That is, the above-mentioned one is constructed by combining two members: the one body and the ball receiving member fitted inside the one body,
The outer end circumference of the ball receiving member is chamfered, and a radial groove is formed on the outer end surface of the ball receiving member or the inner surface of the one body, and the groove penetrates inside and outside the outer wall of the one body. At the same time, a through hole communicating with the annular space defined by the chamfer is formed. The formation of the through holes, chamfers, or radial grooves as described above can be formed by relatively simple machining. Previously, the one in the hanger part had a ball-receiving surface for rollingly receiving the steel ball formed in one piece, so it was very difficult to process and form a passageway that communicated with the inside and outside of such an integral one. However, in the present invention, as mentioned above, these two parts are combined into a one-piece one, and each of these two parts is subjected to relatively simple machining. When assembled, it is possible to easily form a passage that conveniently communicates from the outer wall of the one to the bearing part.

【effect】

Therefore, in the structure of the hanger part of the present invention, by removing the plug on the outer wall of the one to open the entrance of the passage, and inserting the spout of the oil filler there, an appropriate amount of lubricating oil can be dispensed without wasting it. It can be injected into the hanger part reliably and with good workability. Previously, when lubricating the inside of the hanger, the only option was to tilt the bicycle and lubricate from the gap between the crankshaft and the handle, or remove the handle and disassemble the hanger to lubricate. In the present invention, the workability of lubricating the inside of the hanger section is greatly improved. Further, if the plug is attached to the entrance of the passage after oiling, the inside of the hanger becomes airtight because the gap between the crankshaft and the stopper is always sealed by the seal. Therefore, leakage of lubricating oil and intrusion of water, mud, etc. from the outside are almost prevented, and lubrication performance is maintained for a long period of time. As described above, according to the present invention, by simply removing the removable stopper attached to the outer wall of the hanger and injecting lubricating oil from the entrance of the opened passage, lubricating oil can be poured into the inside of the hanger without disassembling it. Can be lubricated. When the plug is installed, the inside of the hanger becomes sealed, preventing leakage of lubricating oil and intrusion of water, mud, etc. from the outside, and maintaining constant lubrication performance and optimal rotational performance of the bearing for a long period of time. As a result, the crankshaft continues to rotate smoothly.

[Explanation of Examples]

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. In the drawings, members that are equivalent to those of the conventional example shown in FIG. 5 are designated by the same reference numerals. In the present invention, each through hole 1 is provided in the left and right ones 7 and 8.
5 and the outer periphery of the crankshaft 4, an inlet Xa is opened in the outer wall of each one 7, 8, and a passage X passing through the seal 18 is provided. The rest of the structure is similar to that of a general hanger. First, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. In this example, each wand 7, 8 has an outer wall portion 7a, 8
Ball receiving members 19, 19 having ball receiving surfaces 9, 10 are press-fitted into the inner periphery of the threaded cylindrical portions 7b, 8b of the one main body, from which the threaded cylindrical portions 7b, 8b extend inward from a. ing. The one body is made of aluminum alloy or carbon fiber reinforced resin, for example.
In addition, the ball receiving members 19, 19 are made of hard metal such as hardened steel. By doing so, the weight of the hanger portion can be reduced and the cost of materials can be reduced, leading to cost reduction. The outer wall portions 7a, 8a are provided with step portions 7e, 8e formed by thick wall portions 7c, 8c on the radially outer side and thin wall portions 7d, 8d on the radial inner side. By making the inner diameters of the ball receiving members 19, 19 press-fitted so as to abut against the thickened portions 7c, 8c smaller than the positions of the stepped portions 7e, 8e, these thin-walled portions 7d, 8d and stepped portions 7e, 8e The ball receiving members 19 and 19 cooperate to form radially inward grooves 7f and 8f. In these grooves 7f and 8f, an annular seal 18,
The base of 18 is attached in a telescoping manner. The lip portions 18a, 18a of this seal 18 are connected to the crankshaft 4.
It extends toward the ball receiving surfaces 5 and 6. On the other hand, in this example, the passage X is
The through holes 7g, 8g penetrated through the thick parts 7c, 8c of the outer walls of the ball receiving members 19, 19, and the annular spaces 19b, 19b created by the chamfering on the outer periphery of the bottom of the ball receiving members 19, 19, It is constituted by a plurality of grooves 19a, 19a extending radially in the radial direction formed on the bottom surfaces of the ball receiving members 19, 19 so as to overlap with the through holes 7g, 8g in the crankshaft direction. Thereby, this passage
It will penetrate to the outside. Then, the above-mentioned through hole 7 as the entrance of the passage
In g and 8g, a plug body 21 made of resin etc.
is removably inserted. In this example, as shown in FIG. 1, by providing a cylindrical dustproof member 20 that connects the inner ends of the left and right ones 7 and 8, dust from the frame pipe connected to the hanger pipe 1 is prevented. In addition to preventing metal powder from entering the bearing parts 2 and 3,
Prevents lubricant from escaping onto each frame. Further, in this example, as a connection structure between the crankshaft 4 and the crank arm 22, a so-called kottaless type is adopted, unlike the kotsukku type of the conventional example shown in FIG. In the structure of the hanger part having the above configuration, in order to inject lubricating oil into the inside of the hanger part, it is only necessary to remove the plug 21 and pour the lubricating oil into the passage X.
Annular spaces 19b, 19b and a plurality of grooves 19a, 1
The lubricating oil is distributed throughout the bearing parts 2 and 3 through 9a. Furthermore, the lip portions 18a, 18a of the seals 18, 18 function as lubricating oil guide paths, ensuring that the lubricating oil reaches the bearing portions 2, 3. In this way, there is no need to disassemble the hanger part when replenishing lubricating oil, so even if the one body is made of resin such as carbon fiber reinforced resin, the one 7 and 8 can be repeatedly screwed into the hanger pipe 1. Wear and damage to the external threads 13, 16 of 7, 8 is avoided. Furthermore, if the stopper is attached to the entrance of the passage
Mud intrusion is prevented. 3 and 4 show a second embodiment of the invention. In this example, the grooves 19a and 19 formed in the ball receiving members 19 and 19 in the first example are
a is formed on the inner surface of the thick portion of the outer wall portions 7a, 8a of the ones 7, 8. Therefore, the passage X is formed between the through holes 7g and 8g, the annular spaces 19b and 19b created by chamfering the outer peripheries of the bottom surfaces of the ball receiving members 19 and 19, and the grooves 19a and 19a. It is structured accordingly. In this way, since it is not necessary to form grooves in the ball receiving members 19, 19, the ball receiving members 19, 19 can be made thinner, which helps to reduce the weight of the hanger portion. In addition, female threads are formed in the through holes 7g and 8g, and the plug body 2
1, a so-called hexagon socket set screw is used. Of course, the scope of this invention is not limited to the embodiments described above. For example, the design of the passage for injecting lubricating oil and the plug that seals the entrance thereof can be modified in various ways other than those of the above-mentioned embodiments.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the first embodiment of the present invention, Fig. 2 is an enlarged view of the main part shown in Fig. 1, Fig. 3 is an enlarged view of the main part of the second embodiment, and Fig. 4 is the main part of the main part shown in Fig. 1. A front view of the one 8 in the embodiment, and FIG. 5 is a sectional view of the conventional example. 4...Crankshaft, 7...(right side) one, 8
... (on the left) One, 18... Seal, 21...
Plug body, X... passage.

Claims (1)

[Claim for Utility Model Registration] A crankshaft inserted through a hanger pipe is screwed onto both ends of the hanger pipe, and a ball receiving surface formed on the inner periphery of the one, and a ball bearing formed on the crankshaft. The crankshaft is rotatably supported via left and right bearing parts having steel balls rotatably interposed between the crankshaft and the crankshaft, and has a seal for sealing the gap between the crankshaft and the one. In the hanger portion, the one has an outer wall portion having a through hole through which the crankshaft is inserted, and a threaded cylindrical portion extending axially inward from a peripheral portion of the outer wall portion, and the threaded cylindrical portion A one main body is screwed into the hanger pipe, and the inner surface of the outer wall of the one main body is attached to the one main body so as to fit into the inner periphery of the threaded cylinder, and the ball receiving surface is attached to the inner periphery. By forming a chamfer on the entire outer edge of the outer circumference of the ball receiving member, an annular space is created between the inner surface of the outer wall of the one body and the ball receiving member. and a plurality of radial grooves communicating with the annular space are provided on the outer end surface of the ball receiving member or the inner surface of the outer wall of the one body, and the outer wall of the one body is penetrated from the inside and outside. Also, by providing a through hole communicating with the annular space, a passage is formed from the entrance of the through hole to the inside of the seal via the through hole, the annular space, or the radial groove, and further, A bicycle hanger structure characterized in that the entrance of this passage is sealed off with a removable plug.