JPH0547603U - Gear device - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevents the phenomenon in which oil in the gearbox is sucked out through the labyrinth drainage hole and leaked when a negative pressure is applied to a gear device that receives rapid negative pressure. To do. [Structure] The lid that forms part of the shaft sealing device has a groove for collecting the oil that has flown out from the bearing and shaken off with an oil cutter, and an oil drain hole for returning the oil collected in this groove to the gear box. In the gear device provided, a structure is provided in the lid near the inlet of the oil drain hole to shield the hole in the axial direction by leaving a slight gap in the radial and axial directions of the hole, and After that, a circular notch is provided on the spigot part of the lid, or a notch that communicates with the oil drain hole is provided on the outer peripheral part of the spigot part that contacts the spigot part of the gear box. The one that connects with the oil drain hole by providing a similar notch leading to the inside of the gear device.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gear device used in a power bogie for railway vehicles.

[0002]

[Prior Art]

 Conventionally, a gear device for a rail vehicle is shown in FIG. 6 shows a part of the gear device, FIG. 6 (a) is a sectional view, FIG. 6 (b) is a side view taken along the line AA of FIG. 6 (a), and FIG. 1), the shaft 1 is supported by the gear box 4 by the bearing 3 via the lid 2. The oil drainer 5 shakes off the oil flowing out from the bearing 3, and the oil collected in the groove 21 machined in the lid 2 is returned to the inside of the gear box by the oil drain hole 22. Further, FIG. 6B is a perspective view of the cover 2 and the spigot portion 41 of the gear box 4 seen from the inside of the gear box, in which the oil drain hole 22 is clearly shown in the lower part.

[0003]

[Problems to be solved by the device]

 In a gear device with such a structure, the lubrication of the bearing is completed, and the oil accumulated in the groove of the lid is returned to the inside of the gear box through the oil drain hole. It sometimes flowed back to the shaft sealing device side through the hole. As one of the causes of this backflow, there is a case where the gear used for oil bath lubrication is a helical gear, and this backflow has an effect that cannot be ignored especially in a gear device that rotates at high speed. However, observing the phenomenon that the oil flows back through the oil drain hole, the air bubbles formed in the hole flow backward due to the wind pressure from the inside of the gear device and return to the inlet, during which oil is gradually added in the lower layer of this hole. It has been observed to be returned inside the gearbox. If the oil draining performance is good, the amount of oil that passes through the oil draining and accumulates near the inlet of the oil drain hole is very small. There may be a large amount of jump out from near the entrance. The present invention has been made in view of the above-mentioned points, and an object thereof is to provide a gear device that prevents backflow of oil.

[0004]

[Means for Solving the Problems]

 In other words, the means for achieving that purpose is to provide a slight gap in the radial and axial directions of the oil drain hole near the inlet of the oil drain hole in a part of the shaft sealing device for supporting the bearing. A structure that shields this hole in the axial direction is provided, and a notch that communicates with the oil drain hole is provided at the bottom of the outer periphery of the spigot part of the lid, and the spigot part of the gearbox opposite to this has the notch. A notch is provided so as to lead to the inside, and the inlet is located at a position offset by about 90 ° from the oil drain hole at the bottom of the spigot part of the lid that forms part of the labyrinth (hereinafter referred to as the horizontal position). The center of the hole at the outlet has a different angle from the center of the shaft on the cross section perpendicular to the shaft, and this hole has an appropriately large hole diameter, and the head is provided inside the gear box. Similarly, for the oil drain hole, when the shaft is held horizontally, the hole diameter can be reduced by making a slight difference in the angle formed by the inlet and outlet of the oil drain hole on the cross section perpendicular to the axis. It is designed to be tilted without reducing.

Furthermore, the oil that has been shaken off by the oil drainer is collected in the lower part of the groove by a groove provided circumferentially on the inner surface of the lid, and an oil drain hole is provided to return the oil from here to the inside of the gear box. However, similar to the oil drain hole at the top of the groove, a hole that leads from this groove to the inside of the gear box is provided in the lid inlay part in the axial direction, and a groove with an appropriate depth is provided on the outer periphery of the inlay part of the lid. The groove is sealed at the lower part of the gear box inlay part so as to obtain an opening to the inside of the gear box, and the groove is installed at the upper part of the inlay part of the lid from the groove. The lid is provided with a hole penetrating axially toward the bilins side.

[0006]

[Action]

 Next, the operation will be described with reference to the drawings described later. As shown in Fig. 1, by providing a shield near the inlet of the oil drain hole, the oil that intermittently and vigorously flows back through the hole is temporarily stopped, and by its reaction, the backflow is blocked. Is. During this time, in the lower layer of this hole, the oil gently returns from the shaft sealing device side to the inside of the gear box, and this amount is shaken off by the oil drainer. It is possible to prevent that. Also, as shown in Fig. 2, the outlet of the oil drain hole of the lid is cut out at the spigot part of the gear box, and by setting it here, the oil is filled even when the gear device is suddenly placed in a negative pressure environment. It prevents the oil that flows down the inner wall of the gear box from being blown out through the oil drain hole.

Further, as shown in FIG. 3, an air hole is formed in the axial direction so that the head is located near the inside of the gear box at the position next to the lid inlay part, so that the gear device is suddenly placed in a negative pressure environment. Even if the labyrinth portion receives a suction action, the air holes allow the air in the gearbox to be evacuated to quickly equalize the pressure. By installing a head (tilt) in the air hole, it is possible to prevent the oil inside the gear box from being guided, and even if some oil is sucked up when the negative pressure is applied, the pressure becomes even in the middle of the air hole (negative pressure). Is about 50 to 100 mmAg) or passes through the tunnel during that time (3 minutes even for long tunnels). Also, if the oil drain hole is inclined to allow air to pass through this hole at all times, a certain amount of time will be required for this hole to be filled with oil when negative pressure is applied to obtain an effect on oil leakage. Is.

Further, as shown in FIGS. 4 and 5, in the case where the hole communicating from the groove to the inside of the gear box is provided in the axial direction on the upper portion of the lid inlay portion, the gear device is suddenly placed in a negative pressure environment. In this case, the hole provided in the upper part of the lid inlay part acts as an air hole without sucking oil from the inside of the gear box through the oil drain hole filled with oil, and the inside of the gear box is quickly made negative pressure, Prevents oil suction and oil leakage. Further, by obtaining the opening of the air hole and the path of the air hole to the inside of the gear box, even if the oil inflow from the air hole which is a concern in the above case, the inside of the air hole can be inserted into the gear box. The opening can be made relatively wide, allowing some air to flow without filling it with front oil. Even if some oil is sucked up, due to the height difference (head) formed by the groove provided on the outer periphery of the lid inlay, it is possible to suck the air inside the gearbox while returning the oil on the way and prevent oil leakage. be able to. Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0009]

【Example】

 1 (a) and 1 (b) show an embodiment of a gear device according to the present invention, FIG. 1 (a) is a sectional view thereof, and FIG. 1 (b) is a side view similar to FIG. 6 (b). 1 (a) and 1 (b), the shaft 1 is supported by the gear box 4 via the bearing 3 and the lid 6, and the oil that lubricates the bearing 3 is shaken off by the oil drainer 5. The structure in which the oil collected in the groove 61 provided in the section and returned to the inside of the gear through the hole 62 is similar to the conventional one. In the present invention, the lid 6 has a structure in which the main body 6a and the small lid 6b are separated from each other, and the spigot portion of the small lid 6b reaches the vicinity of the entrance of the hole 62 to form a gap to the hole 62 to some extent. .. Further, the inner periphery of the spigot of the small lid 6b is provided so as to secure a slight gap with the cylindrical portion provided on the circumference of the lid body 6a.

2 (a) and 2 (b) are similar to FIG. 1 showing a second embodiment of the present invention. In FIGS. 2 (a) and 2 (b), a hole 62 has a gear box inner side. A notch 63 is provided in the outer circumferential direction of the spigot portion of the lid 6 near the outlet, and a notch 72 is provided in the spigot portion 71 of the gear box 7 opposite to this, and the notch 63, 72 is used as the outlet of the hole 62. It is a thing.

3 (a) and 3 (b) are similar to FIG. 1 showing a third embodiment of the present invention. In FIGS. 3 (a) and 3 (b), in FIG. The oil that has been shaken off by the cut 5 is collected in the groove 66 and returned to the gear through the hole 611. The side of the hole 611 that communicates with the groove 66 is the inlet 61a, and the opposite side is the outlet 61b. Further, in FIG. (B), the spigot portion of the lid 6 is viewed from the inside of the gear box, and the inlet 61a and the outlet 61b of the hole 611 form an angle α relative to the axis center on a cross section perpendicular to the axis. The lower part of the spigot part is used as an oil drain hole, and the horizontal part is used as an air hole. The hole in the lower part of the spigot is formed so as to have an angle β with respect to the axis 1 as shown in FIG. (Figure (a) does not show the horizontal holes shown in Figure (b))

4 (a), (b) and 5 (a), (b) are similar to the above-mentioned figures showing the fourth and fifth embodiments of the present invention. In (b), a hole 63 is provided in the upper portion of the lid inlay portion at a position symmetrical to the oil drain hole 62. Further, in FIGS. 5A and 5B, a groove 64 is provided on the outer periphery of the spigot portion of the lid 6, and a hole 63 is formed in the upper portion of the groove 64 to communicate with the groove 61, so that the lid 6 is fitted to the gear box. The notch 42 is provided in the lower part of the spigot portion 41 of No. 4 to obtain the opening of the groove 64 to the inside of the gear box. In addition, the opening formed on the inner side of the gear of the hole 63 for the convenience of the work is closed by the plug 65.

[0013]

[Effect of the device]

 As described above, according to the present invention, in the first embodiment, the momentum of the oil that flows backward intermittently from the outlet of the oil drain hole that returns the oil accumulated in the shaft seal device portion to the inside of the gear box It is possible to stop the backflow by further stopping at the end of the spigot of the small lid, or by the circumferential clearance formed by the inner peripheral portion of the spigot of the small lid and the cylindrical portion of the main body of the lid. Also, during this time, a small amount of oil leaking from the oil drainer passes through the circumferential gap formed between the spigot inner peripheral part of the small lid and the cylindrical part of the lid main body, and the lower part of the oil drain hole. Therefore, it is gradually returned to the gear box to prevent oil leakage from the shaft seal device.

Further, in the second embodiment, when the groove 61 has a negative pressure in the negative pressure environment, the oil filled in the hole 62 flows down along the inner wall of the gear box even if it is blown up. Is blocked by the space created by the notch 72, and some oil droplets may be blown out, but it is possible to prevent a large amount of oil from being blown out.

Furthermore, in the third embodiment, even if the negative pressure that the high-speed vehicle receives in the tunnel acts on the labyrinth portion, there is air communicating with the lid into the gear box, and this hole is inclined. By holding it, the oil in the gearbox is not introduced into the hole, and even if oil is sucked in when negative pressure is applied, it is balanced on the way or the time until the oil is sucked out is extended and passed through the tunnel in the meantime. It is possible to close it. Also, in the oil drain hole, it is possible to incline the oil drain hole of the same diameter as the conventional one without increasing the wall thickness of the spigot part of the lid, so that the oil can be drained smoothly and the space where air always flows is provided. This is effective for oil leakage prevention by continuing and passing air temporarily when a sudden negative pressure acts, or extending the time until the oil drain hole is filled with oil. In the third embodiment, there is a head loss because the inlet of the oil drain hole is not at the lowest point of the groove, and the oil remains at the lowest point of the groove. Since the oil in the groove is shifted to the rotational direction by shifting the position of the lowest point to some extent, if two left and right oil drain holes are provided as in the present invention, the oil drain function is effectively provided in each rotation direction. This is achieved by supplementing the latter by additionally providing an oil drain hole in the axial direction near the lowest point, as was done conventionally.

Further, in the fourth and fifth embodiments, when the groove 61 has a negative pressure in a negative pressure environment, in FIGS. 4A and 4B, the inside of the gear box is located above the groove 61. The air in the gearbox is sucked through the hole 63 leading to the hole 63, the groove 64 in FIGS. 5A and 5B, and the notch 42 in the gearbox inlay portion in FIG. As in the conventional case, oil is sucked up from the hole 62 and a large amount of oil is sucked into the groove 61 to prevent oil leakage. Further, in FIGS. 5A and 5B, even if oil is collected in the notch 42 and sucks up some oil through the groove 64, the oil obtained by the head obtained by the diameter of the groove 64 is used. The amount of oil sucked out is reduced, and when oil is sucked up as air-containing bubbles, the oil film is cut off on the way to obtain resistance to oil leakage. Therefore, the gear device of the present invention has little oil leakage to the outside and is highly practical.

[0017]

[Brief description of drawings]

1 (a) and 1 (b) show a first embodiment of the present invention, FIG. 1 (a) is a sectional view thereof, and FIG. 1 (b) is a side view similar to FIG. ..

2 (a) and 2 (b) show a second embodiment of the present invention, FIG. 2 (a) is a sectional view thereof, and FIG. 2 (b) is a side view similar to FIG. ..

3 (a) and 3 (b) show a third embodiment of the present invention, FIG. 3 (a) is a sectional view thereof, and FIG. 3 (b) is a side view similar to FIG. ..

4 (a) and 4 (b) show a fourth embodiment of the present invention, FIG. 4 (a) is a sectional view thereof, and FIG. 4 (b) is a side view similar to FIG. ..

5 (a) and 5 (b) show a fifth embodiment of the present invention, FIG. 5 (a) is a sectional view thereof, and FIG. 5 (b) is a side view similar to FIG. ..

6 (a) and 6 (b) show a conventional example, FIG. 6 (a) is a cross-sectional view thereof, and FIG. 6 (b) is A- of FIG. 6 (a).
It is a side view as seen in the direction of arrow A.

[0018]

[Explanation of symbols]

 1 Shaft 2 Lid 21 Groove 22 Oil drain hole 23 Notch 21a Hole inlet 21b Hole outlet 3 Bearing 31 Bearing outer ring 4 Gear box 41 Gear spigot 42 Notch 5 Oil drainer 6 Lid 611 Hole 61 Groove 62 Oil drain hole 63 Hole 64 Groove 65 Plug 6a Lid body 6b Small lid 61a Hole inlet 61b Hole outlet

Claims (1)

[Scope of utility model registration request] 1. A lid forming a part of a shaft sealing device is provided with a groove for collecting oil that has been shaken off from a bearing by an oil drainer, and the oil collected in this groove is returned to a gear box. In a gear device provided with an oil hole, the lid near the inlet of the oil drain hole is provided with a structure that shields the hole in the axial direction with a slight gap in the radial and axial directions of the hole, and The hole is made to communicate with a slight gap provided circumferentially in the spigot portion of the lid through the gap of the structure, or the notch communicating with the oil drain hole is attached to the spigot portion of the gear box. A similar notch that is provided on the outer peripheral portion and on the inner peripheral portion of the spigot of the gear box which faces the outer peripheral portion is provided so as to communicate with the inside of the gear device so as to communicate with the oil drain hole, The inlet and outlet centers of the When the shaft is held horizontally with a relative angle, this drain oil is formed to have an inclination with respect to the shaft, or on the inner surface of the lid that holds the bearing outer ring and plays a part of the labyrinth function, and at the bottom. A groove communicating with the inside of the gear box is provided at the upper part of the circumferential groove having an oil drain hole communicating with the inside of the gear box, and a groove having a predetermined depth is formed on the outer periphery of the spigot part of the lid in the gear box. When installed, this groove is provided so as to be closed by the inner surface of the gear box inlay part, and the groove is provided in the gear box inlay part so as to obtain an opening to the inside of the gear, and the groove is provided above the inlay part of the lid. The gear device is characterized in that a hole penetrating to the labyrinth side is provided.