JP2015007471A - Gear device for railway vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gear device for a railway vehicle having a structure capable of preventing a creep phenomenon while the railway vehicle is traveling.SOLUTION: In a gear device GM for a railway vehicle according to the present invention, a gear 5 fixed to an axle 4 is housed in a gear box 1, and axle portions positioned on both axial sides of the gear are respectively journaled by the gear box via bearings 7. An inner ring 71 of each bearing is press-fitted with the axle, and a bearing presser 8 for holding the inner ring between it and the gear from both axial sides is fixed to the axle. A rotation-prevention fitting part 9 for blocking relative rotation of the inner ring to one member out of the gear and the bearing presser is formed on a contact end face between at least one of the gear and the bearing presser, and the inner ring.

Description

  The present invention relates to a gear device for a railway vehicle.

  Some railcars interpose a gear device as a one-stage reduction gear when power is transmitted from a drive source such as a motor to an axle. Such a gear device is known from Patent Document 1, for example. In this gear, a gear (large gear) fixed to an axle is accommodated in a gear box, and axle portions located on both sides in the axial direction of the gear are respectively supported by the gear box via bearings. The inner ring of each bearing is tightly fitted to the axle, and a bearing retainer that sandwiches the inner ring from both sides in the axial direction is fixed to the axle by interference fitting.

  Here, when the railway vehicle travels (while the axle is rotating), if the temperature difference occurs between the axle and the inner ring of the bearing and the inner ring of the bearing expands, the inner ring of the bearing rotates relative to the axle. The creep phenomenon may occur. When the creep phenomenon occurs in this manner, the inner ring of the bearing rotates while rubbing against the axle, which causes a problem that the axle is damaged.

Japanese Patent Laid-Open No. 9-152020

  In view of the above, it is an object of the present invention to provide a gear device for a railway vehicle having a structure capable of preventing the occurrence of a creep phenomenon during traveling of the railway vehicle.

  In order to solve the above-described problems, the present invention is configured such that a gear fixed to an axle is accommodated in a gear box, and axle portions located on both sides in the axial direction of the gear are respectively supported by the gear box via bearings. A gear device for a railway vehicle, in which an inner ring of each bearing is tightly fitted to an axle, and a bearing retainer that sandwiches the inner ring from both sides in the axial direction is fixed to the axle. An anti-rotation engaging portion that prevents relative rotation of the inner ring with respect to one member is formed on a contact end surface between at least one member and the inner ring.

  According to the present invention, when a railway vehicle travels, even if a temperature difference occurs between the axle and the inner ring of the bearing and the inner ring of the bearing expands, at least one member of the gear and the bearing retainer functions as a stopper. By doing so, the relative rotation of the inner ring with respect to one member is prevented, and the occurrence of the creep phenomenon is effectively prevented. Thereby, the trouble that the inner ring | wheel of a bearing rotates, rubbing with an axle shaft, and damages an axle shaft does not arise.

  By the way, when forming the anti-rotation engaging portion, it is conceivable to provide serrations and dog teeth that mesh with each other on the contact end surface of one member and the inner ring of the bearing. Becomes higher. Therefore, in the present invention, the anti-rotation engaging portion is configured by an axial step in which the one member and the inner ring are fitted, and the cross-sectional shape of the step is eccentric with respect to the center line of the axle. It is preferable to adopt a configuration having a circular shape. According to this, it is possible to prevent relative rotation of the inner ring with respect to one member with a simple structure in which a step having a circular cross section is provided, and cost reduction can be achieved.

  On the other hand, the anti-rotation engaging portion includes a pin member standing on one contact end surface of the one member and the inner ring, and the other contact end surface of the one member and the inner ring. It is also possible to adopt a configuration having a hole that is formed in and into which a pin member is inserted.

Sectional drawing explaining the structure of the gear apparatus for railway vehicles of this invention. Sectional drawing explaining the structure of a large gear part. Sectional drawing along the III-III line of FIG. Sectional drawing explaining the structure of the gear apparatus for railway vehicles which concerns on the modification of this invention.

  Hereinafter, a gear device for a railway vehicle according to an embodiment of the present invention will be described with reference to the drawings. In the following, terms indicating directions such as “up” and “down” are based on FIG.

  Referring to FIG. 1, GM is a gear device for a railway vehicle. The gear device GM has a gear box 1, and a small gear 3 fixed to an input shaft 2 that is meshed with each other and connected to a drive source such as a motor (not shown) that is meshed with the gear unit 1 and an axle 4. Thus, the fixed large gear (gear) 5 is accommodated, and the lower portion of the large gear 5 is immersed in the lubricating oil 6.

  Referring also to FIG. 2, the axle 4 portions located on both sides in the axial direction of the large gear 5 are pivotally supported on the gear box 1 via tapered roller bearings 7 serving as bearings. The tapered roller bearing 7 is a known one that includes an inner ring 71 that is tightly fitted to the axle 4, rollers 72, a retainer 73, and an outer ring 74. In this case, a lid 11 that is fitted around the outer ring 74 is fixed to the bearing mounting portion of the gear box 1. A bearing retainer 8 that sandwiches the inner ring 71 from both sides in the axial direction with the large gear 5 is fixed to the axle 4 by an interference fit. When the large gear 5 rotates, the lubricating oil 6 at the lower portion of the gear box 1 is pulled up, and the meshing surface of the small gear 3 and the large gear 5 and the tapered roller bearing 7 are lubricated. The axle 4, the large gear 5, and the bearing retainer 8 may be fixed using a key or a spline.

  Here, when the railway vehicle travels, if the temperature difference occurs between the axle 4 and the inner ring 71 of the tapered roller bearing 7 and the inner ring 71 expands, the creep that the inner ring 71 rotates relative to the axle 4. A phenomenon may occur. When the creep phenomenon occurs in this way, the inner ring 71 rotates while rubbing against the axle 4, so it is necessary to prevent the axle 4 from being damaged. Therefore, in the present embodiment, the detent engagement portion 9 that prevents the relative rotation of the inner ring 71 with respect to the bearing retainer 8 is formed on the contact end surface between the bearing retainer 8 and the inner ring 71. As shown in FIGS. 2 and 3, the anti-rotation engaging portion 9 includes an axial step 91 in which the bearing retainer 8 and the inner ring 71 are fitted, and the cross-sectional shape of the step 91 is set to the center line Ca of the axle 4. It was a circular shape that was eccentric. In this case, the eccentric amount Re is appropriately set within a range in which the bearing retainer 8 functions as a stopper.

  According to the above-described embodiment, when the railway vehicle travels, even if a temperature difference occurs between the axle 4 and the inner ring 71 and the inner ring 71 expands in diameter, the bearing retainer 8 functions as a stopper, thereby causing a creep phenomenon. Is prevented from occurring. Thereby, the malfunction that the inner ring | wheel 71 rotates, rubbing with the axle shaft 4, and the axle shaft 4 is damaged does not arise. Moreover, the anti-rotation engaging portion 9 is configured by an axial step 91 in which the bearing retainer 8 and the inner ring 71 are fitted, and the cross-sectional shape of the step 91 is a circular shape that is eccentric with respect to the center line of the axle 4. It is possible to prevent relative rotation of the inner ring 71 with respect to the bearing retainer 8 with a simple structure in which the step 91 having a circular cross section is provided, and cost reduction can be achieved. When the bearing retainer 8 is fixed to the axle 4 by an interference fit as in the above embodiment, a creep phenomenon may occur in which the bearing retainer 8 rotates relative to the axle 4 due to a temperature difference. Since it hardly occurs at the same time as the creep phenomenon of the inner ring 71, the creep phenomenon of the inner ring 71 can be effectively prevented.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the above. In the above embodiment, the rotation stopper engaging portion 9 is formed on the bearing retainer 8 as an example. However, the present invention is not limited to this. The detent engagement portion 9 can be formed on the contact end surface of the gear 5 with the inner ring 71.

  Also, as shown in FIG. 4, a knock pin (pin member) 90a is erected on the contact surface of the large gear 5 with the inner ring 71 by driving in, and the large gear 5 of the inner ring 71 is associated with the position of the knock pin 90a. The anti-rotation engaging portion 90 can also be formed by forming a hole 90b into which the knock pin 90a is inserted into the contact surface. In this case, it is preferable to provide a plurality of anti-rotation engaging portions 90 including the knock pins 90a and the holes 90b in the circumferential direction. Further, the standing position of the knock pin 90a on the gear 5 and the formation position of the hole 90b on the inner ring 71 are appropriately set in consideration of strength and the like, and the standing position of the knock pin 90a is not limited to that by driving. .

  In addition, the standing method of a pin member is not limited to the thing by a knock pin. Further, the anti-rotation engaging portion 90 composed of the knock pin 90 a and the hole 90 b can be formed on the contact surface between the bearing retainer 8 and the inner ring 71.

  According to the anti-rotation engaging portion 90 of the modified example, it is possible to prevent relative rotation of the inner ring 71 with respect to the bearing retainer 8 with a simple structure as in the above-described embodiment, and furthermore, the occurrence of a creep phenomenon of the inner ring 71 occurs. Can be effectively prevented.

GM ... Gear device, 1 ... Gear box, 4 ... Axle, 5 ... Large gear (gear), 7 ... Conical roller bearing (bearing), 71 ... Inner ring, 8 ... Bearing presser, 9,90 ... Non-rotating engagement part, 90a ... knock pin (pin member), 90b ... hole, 91 ... step, Ce ... centerline of axle, Re ... eccentricity.

Claims (3)

A gear device for a railway vehicle in which gears fixed to an axle are housed in a gear box, and axle portions located on both sides in the axial direction of the gear are respectively supported by the gear box via bearings, The inner ring is tightly fitted to the axle, and the bearing retainer that clamps the inner ring from both sides in the axial direction with the gear is fixed to the axle.
A gear device for a railway vehicle, characterized in that at least one member of a gear and a bearing retainer and a contact end surface between the inner ring and the inner ring are formed with a rotation engaging portion that prevents relative rotation of the inner ring with respect to the one member. .   The anti-rotation engaging portion is configured by an axial step in which the one member and the inner ring are fitted, and a cross-sectional shape of the step is a circular shape eccentric with respect to a center line of the axle. The gear device for a railway vehicle according to claim 1. The anti-rotation engaging portion is formed on a pin member erected on one of the contact end surfaces of the one member and the inner ring, and on the other contact end surface of the one member and the inner ring. The gear device for a railway vehicle according to claim 1, further comprising a hole into which the pin member is inserted.

Images