Rotary shaft fixing device of a traversing head

Abstract

A rotary shaft fixing device of a traversing milling head, the traversing milling head further comprising a housing, a gear set, a first bearing set and a second bearing set, the rotary shaft fixing device comprising an outer washer, an inner washer and a locking unit. The outer washer has a plurality of tapered holes, the locking unit has a plurality of locking holes disposed on the housing and a plurality of adjusting members, each adjusting member has a screw rod segment screwed into a corresponding locking hole and a tapered rod segment, each tapered rod segment has a tapered pressing surface capable of pressing against the bottom side of the tapered surface. By matching the locking unit with the pressing holes, the outer washer can be fixed, the height space can be saved, and the purpose of quick assembly can be achieved.

Description

Technical Field

[0001] This invention relates to a machining machine, and more particularly to a rotating shaft fixing device for a cross-milling head. Background Technology

[0002] A cross-milling head (Chinese Utility Model Patent No. CN210160422U) includes a housing, a tool holder installed inside the housing, a fixing block connected to the housing, a right fixing plate installed in the housing, a left fixing plate installed in the housing, and a tool sleeve installed inside the housing and extending out from the left fixing plate. A locating pin is fixedly provided at the upper end of the fixing block. The fixing block is installed on one side of the bottom of a machine tool spindle, and the tool holder is driven by the spindle.

[0003] Although the aforementioned cross-milling heads are widely used, the bearings installed inside these heads are secured with locking nuts. This locking nut installation can create gaps between the bearing and the bearing, preventing the overall axial height from being reduced. Furthermore, in gear meshing, the assembly distance is often determined by washers, requiring assemblers to actually measure the error distance and then grind the washers on a machining machine, which is time-consuming and labor-intensive. Summary of the Invention

[0004] The purpose of this invention is to provide a rotating shaft fixing device that can solve the problem of existing missing cross-milling heads.

[0005] The present invention discloses a rotating shaft fixing device for a cross-milling head. The cross-milling head includes a housing, a rotating shaft mounted inside the housing, a gear set installed inside the housing, a first bearing set installed inside the housing, and a second bearing set installed inside the housing. The rotating shaft includes a first shaft rod mounted inside the housing and supported by the first bearing set, and a second shaft rod mounted inside the housing and supported by the second bearing set. The first shaft rod extends along a first axis, and the second shaft rod extends along a second axis intersecting the first axis. The gear set transmits power from the first shaft rod to the second shaft rod. The rotating shaft fixing device includes an outer washer, an inner washer, and a locking unit. The outer washer is a hollow cylindrical shape and is installed between the housing and the first shaft rod. The outer washer has an outer circumferential surface and an inner surface opposite to the outer circumferential surface. The outer peripheral surface has several actuating holes spaced apart around the first axis and connecting the outer peripheral surface and the inner peripheral surface. Each actuating hole is conical and defined by a restrained conical surface. The restrained conical surface has a bottom side portion and a top side portion relative to the bottom side portion along the first axis. The diameter of each actuating hole gradually decreases from the outer peripheral surface to the inner peripheral surface. The inner washer is hollow and is installed between the outer washer and the first shaft. The locking unit has several locking holes provided in the housing and several adjusting members. The adjusting members correspond to the actuating holes respectively. Each adjusting member has a screw section screwed into the corresponding locking hole and a conical section connected to the screw section. Each conical section has a conical restraining conical surface that can press against the bottom side portion. The outer diameter of each conical section gradually decreases from one end connected to the screw section to the other end.

[0006] The rotating shaft fixing device for the cross milling head of the present invention includes a gear set comprising a first bevel gear connected to the first shaft and a second bevel gear connected to the second shaft, wherein the first bevel gear and the second bevel gear mesh with each other, and the rotating shaft fixing device further includes a wave spring, wherein the wave spring is installed between the second bearing set and the second bevel gear.

[0007] The rotating shaft fixing device of the cross milling head of the present invention includes a second bearing assembly having several second bearings, one of which has an outer ring positioned on the housing, an inner ring sleeved on the second bevel gear, and several balls disposed between the outer ring and the inner ring. The second bevel gear is supported by the second bearing. One end face of the wave spring abuts against the housing, and the other end face abuts against the outer ring of the second bearing.

[0008] In the rotating shaft fixing device of the cross milling head described in this invention, the minimum diameter of each braking hole of the outer washer is greater than the minimum outer diameter of each tapered rod segment, and the maximum diameter of each braking hole is greater than the maximum outer diameter of each tapered rod segment.

[0009] The beneficial effects of the present invention are as follows: by utilizing the cooperation between each adjusting member of the locking unit and the braking hole, while the adjusting member is screwed in, in addition to axially limiting the outer washer, the conical braking surface can also be used to press against the bottom side of the braking hole, thereby shortening the unnecessary increase in axial distance, saving height space, and achieving the purpose of rapid assembly. Attached Figure Description

[0010] Figure 1 This is a perspective view of an embodiment of the rotating shaft fixing device for the milling head of the present invention.

[0011] Figure 2 This is a three-dimensional exploded view of this embodiment;

[0012] Figure 3 This is a planar composite sectional view of this embodiment;

[0013] Figure 4 yes Figure 3 A partially enlarged schematic diagram; and

[0014] Figure 5 yes Figure 3 Another enlarged view of a portion of the diagram. Detailed Implementation

[0015] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0016] See Figures 1 to 3 An embodiment of the rotating shaft fixing device of the cross milling head of the present invention includes a housing 1, a rotating shaft 2 disposed inside the housing 1, a gear set 3 installed inside the housing 1, a first bearing set 4 installed inside the housing 1, and a second bearing set 5 installed inside the housing 1.

[0017] The housing 1 has a first annular wall 102 surrounding a first axis L1 and defining a first inner hole 101, and a second annular wall 104 surrounding a second axis L2 perpendicular to the first axis L1 and defining a second inner hole 103. The first inner hole 101 and the second inner hole 102 are in communication with each other. The first inner hole 101 is stepped and is defined by an inner wall surface 105. The inner wall surface 105 has a small diameter section 106 adjacent to the second inner hole 103, a large diameter section 107 disposed along the first axis L1 on one side of the small diameter section 106, and a shoulder 108 connecting the small diameter section 106 and the large diameter section 106. The second inner hole 103 is stepped and is defined by an inner annular surface 109. The inner annular surface 109 has a reduced diameter section 109' communicating with the first inner hole 101, a first expanded diameter section 109” disposed along the second axis L2 on one side of the reduced diameter section 109', a first abutment portion 110 connecting the reduced diameter section 109' and the first expanded diameter section 109”, a second expanded diameter section 120 disposed along the second axis L2 on the other side of the reduced diameter section 109', and a second abutment portion 130 connecting the reduced diameter section 109' and the second expanded diameter section 120.

[0018] The rotating shaft 2 includes a first shaft 201 shafted in the first inner hole 101 and a second shaft 202 shafted in the second inner hole 103. The first shaft 201 extends along the first axis L1 and the second shaft 202 extends along the second axis L2.

[0019] The gear set 3 transmits power from the first shaft 201 to the second shaft 202. The gear set 3 includes a first bevel gear 301 connected to the first shaft 201 and a second bevel gear 302 connected to the second shaft 202. The first bevel gear 301 and the second bevel gear 302 mesh with each other.

[0020] The first bearing assembly 4 has two first bearings 401 mounted on the large-diameter section 107. One first bearing 401 abuts against the shoulder 108, and the other first bearing 401 is located at the open end of the large-diameter section 107. The first shaft 201 is supported by the first bearing assembly 4. Each first bearing 401 has an outer ring 402 positioned on the inner wall surface 105, an inner ring 403 sleeved on the first shaft 201, and several balls 404 disposed between the outer ring 402 and the inner ring 403. The bottom of the outer ring 402 abuts against the shoulder 108.

[0021] See also Figure 5The second bearing assembly 5 has several second bearings 501 and 502 installed in the second inner hole 103 and positioned on the second annular wall 104. The second shaft 202 is supported by the second bearing assembly 5. One of the second bearings 501 is installed between the first expanded diameter section 109” and the second bevel gear 302. This one second bearing 501 has an outer ring 503 positioned in the first expanded diameter section 109”, an inner ring 504 sleeved on the second bevel gear 302, and several balls 505 disposed between the outer ring 503 and the inner ring 504. The second bevel gear 302 is supported by this one second bearing 501. The other two second bearings 502 are installed between the second expanded diameter section 120 and the second shaft 202. One of the other two second bearings 502 is positioned against the second abutment part 130. The second shaft 202 is supported by the second bearing 502.

[0022] The rotating shaft fixing device includes an outer washer 10, an inner washer 20, a locking unit 30, and a wave spring 40.

[0023] The outer washer 10 is a hollow cylindrical shape and is installed between the housing 1 and the first shaft 201. The outer washer 10 has a bottom end face 11, a top end face 12 along the first axis L1 opposite to the bottom end face 11, an outer peripheral face 13 connecting the bottom end face 11 and the top end face 12, an inner peripheral face 14 opposite to the outer peripheral face 13, and a plurality of actuating holes 15 spaced apart around the first axis L1 and communicating between the outer peripheral face 13 and the inner peripheral face 14. The bottom end face 11 and the top end face 12 respectively abut against the outer ring 402 of the first bearing 401. Each actuation hole 15 is conical and defined by a tactile cone surface 151, which has a bottom side portion 152 and a top side portion 153 along the first axis L relative to the bottom side portion 152. The diameter of each actuation hole 15 gradually decreases from the outer peripheral surface 13 toward the inner peripheral surface 14.

[0024] The inner washer 20 is a hollow cylindrical shape and is installed between the outer washer 10 and the first shaft 201. The inner washer 20 has two opposite ends along the first axis L that abut against the inner ring 403 of the first bearing 401.

[0025] See also Figure 4The locking unit 30 has several locking holes 31, which are screw holes, disposed in the housing 1, and several adjusting members 32. The locking holes 31 extend radially along the first inner hole 101 and communicate with the first annular wall 102. The adjusting members 32 correspond to the actuating holes 15 respectively. Each adjusting member 32 has a screw section 33 that can be adjusted and screwed into the corresponding locking hole 31, and a tapered section 34 connected to the screw section 33. Each tapered section 34 has a tapered pressing cone surface 341 that can press against the bottom side 152. The outer diameter of each tapered section 34 gradually narrows from the end connected to the screw section 33 to the other end. The minimum diameter of each actuating hole 15 is greater than the minimum outer diameter of each tapered section 34, and the maximum diameter of each actuating hole 15 is greater than the maximum outer diameter of each tapered section 34.

[0026] See also Figure 5 The wave spring 40 is installed between one of the second bearings 501 and the second bevel gear 302 in the second bearing assembly 5. One end face of the wave spring 40 abuts against the first abutment portion 110, and the other end face abuts against the outer ring 503 of the second bearing 501.

[0027] To further understand the effects of the combination of the components of this invention, the technical means employed, and the expected benefits, the following explanation will be provided, which will hopefully lead to a deeper and more specific understanding of this invention.

[0028] like Figure 1 and Figure 2 As shown, when the rotating shaft fixing device of the milling head of the present invention is to be assembled, two of the second bearings 501 and the second shaft 202 are first installed in the second inner hole 103, and then the second bevel gear 302, the wave spring 40 and the other second bearing 501 are assembled into the second inner hole 103.

[0029] The first bearing 401, the inner washer 20, the outer washer 10 and the first bevel gear 301 are assembled on the first shaft 201. Next, the assembled integral structure is placed into the first inner hole 101, with one of the first bearings 401 abutting against the shoulder 108, so that the actuating holes 15 are aligned with the locking holes 31. The adjusting member 32 is then inserted from outside the first annular wall 102 of the housing 1 into the locking hole 31, and the screw section 33 is screwed into the locking hole 31. The tapered section 34 gradually moves towards the corresponding actuating hole 15 until the tapered pressing surface 341 presses against the bottom side 152 of the corresponding pressing surface 151. The inward locking force of the adjusting member 32 generates a downward (axial) force on the outer washer 10, which in turn pushes against one of the first bearings 401, ensuring that the first bearing 401 is firmly in contact with the shoulder 108. At this time, the first bevel gear 301 meshes with the second bevel gear 302.

[0030] Therefore, by locking the adjusting member 32, the housing 1, the outer washer 10, and the first bearing 401 can be fixed simultaneously. Also, because the tapered section 34 of the adjusting member 32 can exert a downward force on the outer washer 10, which in turn pushes against the first bearing 401, the axial distance between the outer washer 10 and the first bearing 401 can be shortened unnecessarily, saving space.

[0031] When the cross-milling head of the present invention is assembled, the first shaft 201, through the first bearing assembly 4, is smoothly rotatable in the first inner hole 101 of the housing 1. The second shaft 202 and the second bevel gear 302, through the second bearing assembly 5, are also smoothly rotatable in the second inner hole 103 of the housing 1. Simultaneously, the outer washer 10 and the inner washer 20 provide stable positioning for the first bearing 401 and stability for the rotation of the first shaft 201.

[0032] Furthermore, the present invention utilizes the wave spring 40 installed between one of the second bearings 501 and the second bevel gear 302 in the second bearing assembly 5. The wave spring 40 provides preload to the second bearing 501, reducing the time required for the washer to be fitted.

[0033] In summary, the rotating shaft fixing device for the milling head of the present invention has a simple overall structure and is easy to operate, and can indeed achieve the purpose of the present invention.

Claims

1. A rotating shaft fixing device for a cross-milling head, the cross-milling head comprising a housing, a rotating shaft disposed inside the housing, a gear set installed inside the housing, a first bearing set installed inside the housing, and a second bearing set installed inside the housing, the rotating shaft comprising a first shaft disposed inside the housing and supported by the first bearing set, and a second shaft disposed inside the housing and supported by the second bearing set, the first shaft extending along a first axis, the second shaft extending along a second axis intersecting the first axis, the gear set transmitting power from the first shaft to the second shaft, the rotating shaft fixing device comprising an outer washer, an inner washer, and a locking unit, characterized in that: The outer washer is a hollow cylindrical shape and is installed between the housing and the first shaft. The outer washer has an outer peripheral surface, an inner peripheral surface opposite to the outer peripheral surface, and a plurality of actuating holes spaced apart around the first axis and connecting the outer peripheral surface and the inner peripheral surface. Each actuating hole is conical and is defined by a tactile conical surface. The tactile conical surface has a bottom side portion and a top side portion relative to the bottom side portion along the first axis. The diameter of each actuating hole gradually decreases from the outer peripheral surface toward the inner peripheral surface. The inner washer is in the shape of a hollow cylinder and is installed between the outer washer and the first shaft. The locking unit has several locking holes disposed on the housing and several adjusting members, each adjusting member corresponding to the braking hole. Each adjusting member has a screw section screwed into the corresponding locking hole and a tapered section connected to the screw section. Each tapered section has a tapered braking surface that can press against the bottom side. The outer diameter of each tapered section gradually narrows from one end connected to the screw section to the other end.

2. The rotating shaft fixing device for the cross-milling head according to claim 1, characterized in that: The gear set includes a first bevel gear connected to the first shaft and a second bevel gear connected to the second shaft. The first bevel gear and the second bevel gear mesh with each other. The rotating shaft fixing device also includes a wave spring, which is installed between the second bearing set and the second bevel gear.

3. The rotating shaft fixing device for the cross-milling head according to claim 2, characterized in that: The second bearing assembly has several second bearings, one of which has an outer ring positioned on the housing, an inner ring sleeved on the second bevel gear, and several balls disposed between the outer ring and the inner ring. The second bevel gear is supported by the second bearing. One end face of the wave spring abuts against the housing, and the other end face abuts against the outer ring of the second bearing.

4. The rotating shaft fixing device for the cross-milling head according to claim 1, characterized in that: The minimum diameter of each braking hole of the outer washer is greater than the minimum outer diameter of each tapered rod segment, and the maximum diameter of each braking hole is greater than the maximum outer diameter of each tapered rod segment.

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