Cam follower mounting retaining jig and cam follower mounting method

Abstract

When installing a cam follower in a location surrounded by other components, it may be difficult to tighten the nut while continuously holding it in place. [Solution] A cam follower mounting and holding jig for mounting a cam follower comprising an inner ring, an outer ring, a shaft portion protruding from one flat surface of the inner ring, and a hole and notch groove having a female thread portion on the inner circumferential surface provided on the other flat surface of the inner ring, comprises a long body, a through hole provided from the middle of the longitudinal direction of the body toward one end, a rotating holding piece provided on one opening side of the through hole and insertable into the notch groove, and a male screw that is inserted into the through hole from the other opening side of the through hole and can be connected to the female thread portion.

Description

Technical Field

[0001] The present disclosure relates to a cam follower mounting retainer jig and a cam follower mounting method.

Background Art

[0002] When attaching a cam follower, it is necessary to hold it down so that the cam follower does not rotate when tightening the nut.

[0003] To address this, Patent Document 1 discloses a tightening tool for a cam follower provided at the tip of a handle, which combines a semi-circular sheet metal that fits into a semi-circular groove drilled at the shaft end of the cam follower and a round shaft that fits into the center hole of the cam follower.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] With the tightening tool of Patent Document 1, when tightening the nut, it is necessary to hold the handle part with a finger. Therefore, when attaching the cam follower to a location surrounded by other members, it may be difficult to tighten the nut while continuously holding down the handle part.

[0006] The present disclosure has been made to solve the above problems, and an object thereof is to provide a cam follower mounting retainer jig and a cam follower mounting method that facilitate the attachment of a cam follower.

Means for Solving the Problems

[0007] The cam follower mounting and holding jig for mounting a cam follower comprising an inner ring, an outer ring, a shaft portion protruding from one flat portion of the inner ring, and a hole portion and a notched groove having a female thread portion on the inner circumferential surface provided on the other flat portion of the inner ring, comprises a long body, a through hole provided from the middle of the longitudinal direction of the body toward one end, a rotating holding piece provided on one opening side of the through hole and insertable into the notched groove, and a male screw that is inserted into the through hole from the other opening side of the through hole and connectable to the female thread portion. [Effects of the Invention]

[0008] According to this disclosure, installation can be made easier. [Brief explanation of the drawing]

[0009] [Figure 1] This is a configuration diagram showing the escalator configuration in Embodiment 1. [Figure 2] This is a schematic diagram of the driven motor chamber of the escalator in Embodiment 1, viewed from the side. [Figure 3] This is a schematic diagram of the driven motor chamber of the escalator in Embodiment 1, viewed from above. [Figure 4] This is a schematic diagram showing an enlarged view of the base portion in Embodiment 1. [Figure 5] This is a schematic diagram showing the configuration of the cam follower in Embodiment 1. [Figure 6] This is a diagram showing the configuration of the mounting and holding jig in Embodiment 1. [Figure 7] This flowchart shows the process of attaching the cam follower to the base in Embodiment 1. [Figure 8] This is a diagram showing the configuration of the mounting and holding jig in Embodiment 2. [Modes for carrying out the invention]

[0010] The embodiments for implementing this disclosure will be described with reference to the attached drawings. In each drawing, the same or corresponding parts are denoted by the same reference numerals, and redundant explanations are simplified or omitted as appropriate.

[0011] Embodiment 1. Figure 1 is a diagram showing the configuration of an escalator, which is a passenger conveyor.

[0012] In Figure 1, escalator 1 spans between the upper and lower floors of a building not shown. Here, the direction towards the upper floor is considered forward, and the direction towards the lower floor is considered backward. The escalator 1 comprises a first entrance / exit 2a, a second entrance / exit 2b, a main frame 3, multiple steps 4, a drive sprocket 5, a step chain 6, a drive unit 7, a driven sprocket 8, a pair of railings 9, a pair of movable handrails 10, and a pair of movable handrail drive units 11.

[0013] The first entrance / exit 2a is located on the upper floor of the building, and the second entrance / exit 2b is located on the lower floor of the building. The main frame 3 spans between the first entrance / exit 2a and the second entrance / exit 2b, and has a machine room 3a at its upper end and a driven machine room 3b at its lower end. The machine room 3a is located below the first entrance / exit 2a, and the driven machine room 3b is located below the second entrance / exit 2b.

[0014] Multiple steps 4 are connected in an endless manner and are positioned between the first entrance / exit 2a and the second entrance / exit 2b. The step chain 6 is an endless chain that connects the multiple steps 4, and a portion of it is wrapped around the drive sprocket 5 installed in the machine room 3a and the driven sprocket 8 installed in the driven machine room 3b.

[0015] The drive unit 7 moves the multiple steps 4 by driving the drive sprocket 5. The drive unit 7 includes a reduction gear 12, a V-belt 13, and a drive motor 14. The reduction gear 12 includes an input shaft 12a, a gear section 12b, and an output shaft 12c. The V-belt 13 is wrapped around the pulley (not shown) of the input shaft 12a and the pulley 15 of the drive motor 14.

[0016] The moving handrail drive 11 receives power from the rotation of the drive sprocket 5 and moves the endless moving handrail 10 on the handrail guide rail of the railing 9 in synchronization with the movement of the step 4.

[0017] Figure 2 is a schematic configuration diagram seen from the side of the driven machine chamber 3b. Figure 3 is a schematic configuration diagram of the driven machine chamber 3b in Figure 2, particularly, seen from above around the driven sprocket 8. Figure 4 is a schematic configuration diagram of the pedestal portion (the portion surrounded by the dotted square) in Figure 3 enlarged. In Figures 2, 3, and 4, the description of a plurality of steps 4 is omitted.

[0018] The driven machine chamber 3b has two front left and right iron front columns 100a, two rear left and right iron rear columns 100b, two upper beams 100c in the front and rear directions and two in the left and right directions at the upper part, and two lower beams 100d in the front and rear directions and two in the left and right directions at the lower part, forming a rectangular parallelepiped-shaped frame.

[0019] Also, between the front column 100a and the rear column 100b, two pedestal rails 101 are fixed so as to be parallel to the upper beam 100c and the lower beam 100d. The driven sprocket 8 is composed of an inner ring 8a, an outer ring 8b, and a bearing portion 8c located therebetween. With the inner ring 8a fixed, the outer ring 8b is rotatable. Grease is supplied to the bearing portion 8c via a grease supply pipe (not shown).

[0020] There is a main shaft hole at the center of the inner ring 8a, and the main shaft 102 passes through the main shaft hole and is fixed. Also, at the left and right ends of the main shaft 102, a pedestal assembly having a pedestal portion 103 and a cam follower 104 is fixed. The pedestal portion 103 has a main shaft receiving portion 103a for receiving the main shaft 102 and leg portions 103b extending downward before and after it, and the cam follower 104 is connected to the leg portions 103b.

[0021] The cam follower 104 consists of an inner ring 104a, an outer ring 104b, and a bearing portion 104c located between them. A shaft portion 104d protrudes from the center of the inner ring 104a, and this shaft portion 104d is inserted into the shaft hole 103b1 of the leg portion 103b and secured by tightening a nut 105 from the opposite side. Thus, the cam follower 104 can move on the base rail 101 by rotating the outer ring 104b.

[0022] Furthermore, an SCS through bolt 106 is sandwiched between the driven sprocket 8 and the base portion 103, and the main shaft 102 is inserted into and fixed into the main shaft hole formed at the end of the bolt, thereby connecting the driven sprocket 8 and the SCS through bolt 106.

[0023] The SCS through bolt 106 extends towards the rear, passing through a through hole formed in the L-shaped truss fixing angle 107. On the side opposite to the main shaft 102, the SCS spring 108 is inserted and secured with the SCS adjustment nut 109. As a result, one end of the SCS spring 108 in the direction of extension is restricted by one side of the truss fixing angle 107, and the other end is restricted by the SCS adjustment nut 109.

[0024] In this configuration, tension acts on the SCS spring 108 in the direction of extension, but because it is restricted by one side of the truss fixing angle 107, a force is generated pulling the SCS through bolt 106 in the rearward direction. This force also acts on the driven sprocket 8 via the main shaft 102, and consequently pulls the step chain 6 backward, thus maintaining the tension of the step chain 6.

[0025] Furthermore, when the escalator 1 operates, vibrations naturally occur on the step chain 6, which can change the balance with the tension of the SCS spring 108. In such cases, the cam follower 104 moves back and forth on the base rail 101, causing the driven sprocket 8 to also move back and forth, thereby adjusting the force.

[0026] In this way, the cam follower 104 moves in small increments along the base rail 101, which can cause the outer ring 104b to be partially worn down. In such cases, the cam follower 104 will need to be replaced.

[0027] Figure 5 is a schematic diagram showing the configuration of the cam follower 104, where (a) is an external view, (b) is a plan view, and (c) is a longitudinal cross-sectional view along line AA'.

[0028] From one of the two planes of the inner ring 104a of the cam follower 104, a cylindrical shaft portion 104d, whose diameter is smaller than the diameter of the inner ring 104a, extends with the same central axis as the inner ring 104a, and a screw groove 104d1 is formed in a predetermined length range from its end face. The nut 105 is then tightened and fixed into this screw groove 104d1. In addition, a grease hole 104d2, smaller than the diameter of the shaft portion 104d, is formed extending from the end face to the inner ring 104a.

[0029] On the other flat surface of the inner ring 104a, there is a hole in the center that connects to the grease hole 104d2, and a screw groove is formed on the inner circumferential surface from the flat surface to form a female screw portion 104a1. In addition, a notched groove 104a2 is formed that is rectangular in plan view and triangular in cross-section, connecting to the female screw portion 104a1.

[0030] When inserting the shaft portion 104d of the cam follower 104 into the shaft hole 103b1 of the leg portion 103b and fixing it with a nut 105 from the opposite side, a mounting retaining jig 200 is used to prevent the cam follower 104 from rotating along with the shaft.

[0031] Figure 6 is a diagram showing the configuration of the mounting and holding jig 200, where (a) is a longitudinal cross-sectional view and (b) is a front view opposite the plan view of the inner ring 104a.

[0032] The mounting and holding jig 200 has a long, rectangular body 201. A through hole 202 is formed in the longitudinal direction of the body 201 from the middle to one end. Furthermore, the body 201 has a rotating holding piece 203 formed by a pair of triangular pieces in the longitudinal direction, flanking one opening 202a of the through hole 202. A wing nut 204 is inserted through the other opening 202b of the through hole 202.

[0033] On the opposite side of where the through hole 202 is formed, that is, between the middle and the other end in the longitudinal direction, a handle portion 201a is formed.

[0034] Figure 7 is a flowchart showing the process of attaching the cam follower 104 to the base portion 103 using the mounting and holding jig 200.

[0035] First, the shaft portion 104d of the cam follower 104 is inserted into the shaft hole 103b1 of the leg portion 103b of the base portion 103, and the nut 105 is fitted onto the tip of the shaft portion 104d to temporarily fix it in place (step S001).

[0036] Next, the rotating retaining piece 203 is inserted into the notched groove 104a2 and pushed in so that it fits into place. In this state, the wing nut 204, which has been passed through the through hole 202 from the opening 202b, is inserted into the female threaded portion 104a1 from the flat surface of the inner ring 104a of the cam follower 104, and tightened to secure it. In this way, the mounting retaining jig 200 is attached to the cam follower 104 (step S002).

[0037] Next, the handle portion 201a is supported by hand to prevent the inner ring 104a and shaft portion 104d from rotating, and the nut 105 and screw groove 104d1 are tightened to secure it (step S003).

[0038] Finally, loosen the wing nut 204 and remove the mounting retaining jig 200 from the cam follower 104 (step S004).

[0039] Thus, in Embodiment 1, the cam follower 104 can be easily attached to the base portion 103 by using the mounting and holding jig 200.

[0040] In Figure 6, the rotating retaining piece 203 is formed across one of the openings 202a of the through hole 202, but it is not limited to this. Essentially, it should be positioned opposite the notch groove 104a2 of the inner ring 104a and fit into the notch groove 104a2.

[0041] Furthermore, if the main body 201 is elongated, it does not have to be a perfect rectangular parallelepiped shape. It may have irregularities on its surface, or the side with the through hole 202 may be narrower, while the side with the handle portion 201a is wider.

[0042] Embodiment 2. Figure 8 shows the configuration of the mounting and holding jig in Embodiment 2, where (a) is a vertical cross-sectional view and (b) is a front view opposite the plan view of the inner ring 104a. In Figure 8, a hex bolt is used instead of the wing nut 204, and it is tightened with a wrench or similar tool.

[0043] In Figure 8, a cylindrical member 205, whose diameter is larger than that of the rectangular parallelepiped body 201 in the width direction, is provided between the middle and one end of the body 201 in the longitudinal direction. Similar to Figure 6, the cylindrical member 205 has a through hole 202 and a rotating retaining piece 203, and a hexagonal bolt 206 is inserted into the through hole 202. The size of the plane of the cylindrical member 205 is the same as, or slightly larger than, the size of the plane of the inner ring 104a.

[0044] When attaching the cam follower 104 to the base portion 103 using this mounting fixture 200, the hexagonal bolt 206 is attached with a wrench in step S002 of Figure 7. In this case, the frictional force at the surface contact between the flat surface of the inner ring 104a and the flat surface of the cylindrical member 205 increases. Therefore, when tightening the nut 105 in step S003, the force applied to the rotational retaining piece 203 is reduced.

[0045] In Figure 8, the cylindrical member 205 is provided between the middle and one end of the main body 201 in the longitudinal direction, but it may also be connected to and fixed to one end.

[0046] Although preferred embodiments have been described in detail above, the invention is not limited to these embodiments, and various modifications and substitutions can be made to the embodiments described above without departing from the scope of disclosure.

[0047] Furthermore, when referring to the number, quantity, amount, range, etc., of each element in the embodiments, the apparatus of this disclosure is not limited to the referred number unless specifically stated or clearly defined in principle. Also, the structures, etc., described in these embodiments are not necessarily essential unless specifically stated or clearly defined in principle.

[0048] To summarize the above explanation, the possible configurations of the technology relating to this disclosure include the configurations listed below as appendices. (Note 1) A cam follower mounting and holding jig for mounting a cam follower comprising an inner ring, an outer ring, a shaft portion protruding from one flat portion of the inner ring, and a hole portion and a notched groove having a female thread portion on the inner circumferential surface provided on the other flat portion of the inner ring, the cam follower mounting and holding jig characterized by comprising a long body, a through hole provided from the middle of the longitudinal direction of the body toward one end, a rotating holding piece provided on one opening side of the through hole and insertable into the notched groove, and a male screw that is inserted into the through hole from the other opening side of the through hole and connectable to the female thread portion. (Note 2) The cam follower mounting and holding jig according to Appendix 1, characterized in that it has a handle portion provided on the longitudinal direction of the main body from the middle to the other end. (Note 3) The cam follower mounting and holding jig according to Appendix 1 or Appendix 2, characterized in that the male screw is a wing screw. (Note 4) The cam follower mounting and holding jig according to Appendix 1 or Appendix 2, characterized in that it has a cylindrical member provided from the middle of the longitudinal direction of the main body to one end, and the through hole penetrates from one plane of the cylindrical member to the other plane. (Note 5) The cam follower mounting and holding jig according to Appendix 4, characterized in that the plane of the cylindrical member is the same as or larger than the plane of the inner ring. (Note 6) The cam follower mounting and holding jig according to Appendix 4 or Appendix 5, characterized in that the male screw is a bolt. (Note 7) A method for mounting a cam follower, comprising an inner ring, an outer ring, a shaft portion protruding from one flat surface of the inner ring, and a hole portion and a notch groove provided on the other flat surface of the inner ring, having a female screw portion on its inner circumferential surface, in a shaft hole formed in a base connected to a driven sprocket of an escalator, the method comprising the steps of: inserting the shaft portion into the shaft hole and temporarily fixing a nut to the shaft portion; pushing a jig having a long body, a through hole provided from the middle to one end in the longitudinal direction of the body, and a rotating retaining piece provided on one opening side of the through hole, so that the rotating retaining piece is inserted into the notch groove, inserting a male screw into the through hole from the other opening side and connecting it with the female screw portion; and supporting the jig with a handle portion provided from the middle to the other end in the longitudinal direction of the body and tightening the nut. [Explanation of Symbols]

[0049] 1 Escalator, 2a First entrance / exit, 2b Second entrance / exit, 3 Main frame, 3a Machine room, 3b Driven room, 4 Step, 5 Drive sprocket, 6 Step chain, 7 Drive mechanism, 8 Driven sprocket, 8a Inner ring, 8b Outer ring, 8c Bearing section, 9 Railing, 10 Movable handrail, 11 Movable handrail drive mechanism, 12 Reducer, 12a Input shaft, 12b Gear section, 12c Output shaft, 13 V-belt, 14 drive motor, 15 pulley, 100a front column, 100b rear column, 100c upper beam, 100d lower beam, 101 Base rail, 102 Main shaft, 103 Base section, 103a Main bearing section, 103b Leg, 103b1 Axle hole, 104 Cam follower, 104a Inner ring, 104a1 Female thread section, 104a2 Notched groove, 104b Outer ring, 104c Bearing part, 104d Shaft part, 104d1 Screw groove, 104d2 Grease hole, 105 Nut, 106 SCS through bolt, 107 Truss fixing angle, 108 SCS spring, 109 SCS adjustment nut, 200 Mounting retaining jig, 201 Main body, 202 Through hole, 202a Opening, 202b Opening, 203 Rotating retaining piece, 204 Wing nut, 205 Cylindrical member, 206 Hex bolt

Claims

1. A cam follower mounting and holding jig for mounting a cam follower comprising an inner ring, an outer ring, a shaft portion protruding from one flat portion of the inner ring, and a hole portion and a notched groove having a female thread portion on the inner circumferential surface provided on the other flat portion of the inner ring, the cam follower mounting and holding jig characterized by comprising a long body, a through hole provided from the middle of the longitudinal direction of the body toward one end, a rotating holding piece provided on one opening side of the through hole and insertable into the notched groove, and a male screw that is inserted into the through hole from the other opening side of the through hole and connectable to the female thread portion.

2. The cam follower mounting and holding jig according to claim 1, characterized in that it has a handle portion provided on the longitudinal side of the main body from the middle to the other end.

3. The cam follower mounting and holding jig according to claim 1 or 2, characterized in that the male screw is a wing nut.

4. The cam follower mounting and holding jig according to claim 1 or 2, characterized in that it has a cylindrical member provided from the middle of the longitudinal direction of the main body to one end, and the through hole penetrates from one plane of the cylindrical member to the other plane.

5. The cam follower mounting and holding jig according to claim 4, characterized in that the plane of the cylindrical member is the same as or larger than the plane of the inner ring.

6. The cam follower mounting and holding jig according to claim 4, characterized in that the male screw is a bolt.

7. A method for mounting a cam follower, comprising an inner ring, an outer ring, a shaft portion protruding from one flat surface of the inner ring, and a hole portion and a notch groove provided on the other flat surface of the inner ring, having a female screw portion on its inner circumferential surface, in a shaft hole formed in a base connected to a driven sprocket of an escalator, the method comprising the steps of: inserting the shaft portion into the shaft hole and temporarily fixing a nut to the shaft portion; pushing a jig having a long body, a through hole provided from the middle to one end in the longitudinal direction of the body, and a rotating retaining piece provided on one opening side of the through hole, so that the rotating retaining piece is inserted into the notch groove, inserting a male screw into the through hole from the other opening side and connecting it with the female screw portion; and supporting the jig with a handle portion provided from the middle to the other end in the longitudinal direction of the body and tightening the nut.

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