CN113490805A

CN113490805A - Gear device for railway vehicle

Info

Publication number: CN113490805A
Application number: CN201980091700.7A
Authority: CN
Inventors: 小野宽; 辻勇
Original assignee: Yanzuo Technology Co ltd; Toyo Electric Manufacturing Ltd
Current assignee: Yanzuo Technology Co ltd; Toyo Electric Manufacturing Ltd
Priority date: 2019-03-08
Filing date: 2019-03-08
Publication date: 2021-10-08
Anticipated expiration: 2039-03-08
Also published as: WO2020183536A1; JP7273137B2; CN113490805B; JPWO2020183536A1

Abstract

A gear device for a railway vehicle is provided with: a pinion (2) coupled to an output shaft of the drive source; and a large gear (4) that meshes with the small gear (2) and is coupled to the axle (3), wherein the small gear (2) and the large gear (4) are each formed of an arc gear, and the tooth trace (21, 41) of the arc gear, which is the intersection of the tooth surface and the pitch circle cylinder, is the torsion angle (theta) between the center (c) in the tooth width direction and the generatrix (22, 42) of the pitch circle cylinder₁、θ₂) Is zero arc-shaped, and the curvature radius (r) of the tooth trace (21) of the pinion (2)₁) Larger than the radius of curvature (r) of the tooth trace (41) of the gearwheel (4)₂) The both ends in the width direction of the tooth surface of one of the pinion gear (2) and the bull gear (4) are provided with cutting ends (5) so as not to contact the tooth surface of the other of the pinion gear (2) and the bull gear (4).

Description

Gear device for railway vehicle

Technical Field

The present invention relates to a gear device for a railway vehicle, which comprises: a pinion gear coupled to an output shaft of the drive source; and a large gear engaged with the small gear and coupled to the axle.

Background

Conventionally, as a cylindrical gear, an arc gear is known in which a tooth trace, which is an intersection of a tooth surface and a pitch circle cylinder, is an arc shape having a torsion angle of zero with respect to a generatrix of the pitch circle cylinder at a center in a tooth width direction (for example, see patent document 1). The circular arc gear has the following advantages: the herringbone gear can play the characteristic of eliminating thrust and can be manufactured as an integrated piece. The 2 circular arc gears in a pair are disposed so that their respective axes are parallel to each other and mesh with each other, and are generally used for a gear pump for transferring a viscous fluid such as fuel oil or lubricating oil.

The above-described characteristics of the circular arc gear are receiving attention, and it is considered to apply the circular arc gear to a pinion gear and a bull gear which are engaged with each other and provided in a gear device for a railway vehicle. However, in trial production and experiments, the following problems have been found with respect to torque transmission of a pinion gear and a rack gear provided in a gear device for a railway vehicle: in addition to the larger diameter of the pitch circle and the heavier weight of the circular arc gear used for the gear pump, the high-load high-speed rotation is performed by the high-speed rotation, and therefore, deflection occurs in the tooth crest portions of the large and small gear teeth, and one end of the tooth surface to be meshed due to the reduction in thrust performance is eliminated from coming into contact, and breakage of the teeth, dents (hammering), and the like occur. It is known that crowning (crowning) of the tooth trace is effective for eliminating one end contact of the tooth surface, but if crowning is performed on the tooth trace, thrust cancellation performance, which is one of the above-described characteristics of the circular arc gear, is lowered, and the thrust suppression effect is impaired.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 11-118023

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a gear device for a railway vehicle capable of preventing one end of a tooth surface from coming into contact while sufficiently ensuring thrust canceling performance.

In order to solve the above problem, a gear device for a railway vehicle according to the present invention includes: a pinion gear coupled to an output shaft of the drive source; and a large gear that meshes with the small gear and is coupled to the axle, wherein the small gear and the large gear are each configured by an arc gear, a tooth trace that is an intersection of a tooth surface and a pitch cylinder of the arc gear is arc-shaped in which a torsion angle with respect to a generatrix of the pitch cylinder is zero at a center in a tooth width direction, a curvature radius of the tooth trace of the small gear is larger than a curvature radius of the tooth trace of the large gear, and a cut end portion is provided at both end portions in the width direction of the tooth surface of one of the small gear and the large gear so as not to contact the tooth surface of the other of the small gear and the large gear.

According to the present invention, since the curvature radius of the tooth trace of the pinion gear is larger than the curvature radius of the tooth trace of the large gear, and the chamfered portions are provided at both ends in the width direction of the tooth surface of one of the pinion gear and the large gear so as not to contact the tooth surface of the other of the pinion gear and the large gear, the tooth surfaces of the meshing portion of the pinion gear and the large gear can contact each other at portions other than the chamfered portions at both ends in the width direction of the tooth surfaces. Thus, even if the tooth tip portion is deflected by high-speed rotation under a high load, the pinion and the large gear can sufficiently ensure thrust cancellation performance and prevent one end of the tooth surface from contacting.

Drawings

Fig. 1 is a perspective view showing an outline of a pinion gear and a bull gear provided in a gear device for a railway vehicle according to the present invention.

Fig. 2 is a schematic view showing tooth lines of meshing portions of the pinion gear and the bull gear shown in fig. 1.

Detailed Description

Referring to fig. 1 and 2, the railway gear device includes a gear case (not shown) provided on a carriage of a vehicle, and includes, in the gear case: a pinion 2 having an axle 1 coupled to an output shaft of a motor serving as a drive source outside the drawings; and a large gear 4 that meshes with the small gear 2 and is coupled to the axle 3. The output shaft and the axle 3 are arranged in the horizontal direction, and the axles 1 and 3 are parallel to each other. Further, lubricating oil (not shown) is stored in the inner bottom portion of the gear box, the lower portion of the large gear 4 is immersed in the lubricating oil, the lubricating oil is lifted up with the rotation of the large gear 4, and the meshing portion between the large gear 4 and the small gear 2, the bearings, and the like are lubricated by the lifted-up lubricating oil. In addition, since well-known components can be used for components, elements, and the like of the railway gear device, a more detailed description thereof will be omitted.

As shown in fig. 2, the pinion gear 2 and the bull gear 4 are each formed of a circular arc gear having tooth lines 21 and 41 as intersecting lines of tooth surfaces and a pitch circle cylinder, respectively, the torsion angle θ between the center c in the tooth width direction and the

generatrices

22 and 42 of the pitch circle cylinder₁、θ₂Is a zero arc. In addition, the radius of curvature r of the tooth trace 21 of the pinion 2₁Radius of curvature r greater than the tooth trace 41 of the gearwheel 4₂(r₁＞r₂) A tapered end (relieving) portion 5 is provided at both ends in the width direction of the tooth surface of the large gear 4 so as not to contact the tooth surface of the pinion gear 2.

For such meshing portions of the pinion gear 2 and the large gear 4, the tooth surfaces can contact each other at portions other than the cut end portions 5 at both end portions in the width direction of the tooth surfaces. The contact between the tooth surfaces of the pinion gear 2 and the bull gear 4 in this portion is a line contact in the tooth height direction when the motor is stopped, and a surface contact in both the tooth width direction and the tooth height direction is caused by the deflection of the tooth tip portion accompanying high-load high-speed rotation when the motor is operated. However, this surface contact also causes the tooth surfaces of the meshing portions of the pinion gear 2 and the bull gear 4 to be not in contact with each other in the region between the portions of the contact surfaces closest to the center c in the tooth width direction but to form the gap 6. In this way, in the present embodiment, the pinion gear 2 and the large gear 4 can make the tooth surfaces contact each other at the meshing portion except for the cut end portions 5 at both ends in the width direction of the tooth surfaces, and therefore, even if the pinion gear 2 and the large gear 4 are deflected at the tooth tip portion by high-speed rotation under a high load, the thrust cancellation performance can be sufficiently secured and one end of the tooth surfaces can be prevented from contacting. Therefore, breakage, dent, and the like of the tooth do not occur due to contact of one end of the tooth surface. Further, the meshing ratio of the pinion gear 2 and the bull gear 4 can be increased to achieve noise reduction as compared with the case of crowning.

For example, the flank surface of the large gear 4 may be cut from a portion contacting the flank surface of the small gear 2 to a portion of the tooth end in the width direction to form the chamfered portion 5. The cut end portion 5 is also a portion corresponding to: the large gear 4 is easily quenched by carburizing and quenching, and is more brittle than other portions. Since the less brittle portions of the teeth of the large gear 4 can be removed by the end cutting, the end cutting portion 5 does not participate in the meshing of the small gear 2 and the large gear 4. This is advantageous for preventing breakage, dents, and the like of the teeth of the pinion gear 2 and the bull gear 4 when the motor is in operation.

The embodiments of the present invention have been described above with reference to the drawings, but the present invention is not limited thereto. The portions other than the pinion gear 2 and the bull gear 4 include conventionally known structures, and various structures can be adopted. In the above embodiment, the cutting end portion 5 is provided on the large gear 4, but the cutting end portion 5 may be provided on the small gear 2. The diameters, the numbers of teeth, and the radii of curvature r of the pitch circles of the pinion gear 2 and the bull gear 4₁、r₂The specific numerical values and the like of (3) are not particularly limited.

Description of the reference numerals

2 … pinion, 21 … tooth trace, 22 … generatrix, 3 … axle, 4 … bull gear, 41 … tooth trace, 42 … generatrix, 5 … cut end part, theta₁、θ₂… torsion angle, r₁… radius of curvature, r, of tooth trace 21₂… radius of curvature of tooth trace 41, c … center in the tooth width direction.

Claims

1. A gear device for a railway vehicle is provided with: a pinion gear coupled to an output shaft of the drive source; and a large gear engaged with the small gear and connected with the axle,

the pinion gear and the bull gear are each constituted by an arc gear having a tooth trace as an intersection of a tooth surface and a pitch circle cylinder, the tooth trace being an arc shape in which a torsion angle with respect to a generatrix of the pitch circle cylinder is zero at the center in a tooth width direction,

the radius of curvature of the tooth trace of the pinion gear is larger than that of the tooth trace of the bull gear,

the respective ends in the width direction of the tooth surfaces of one of the pinion gear and the bull gear are provided with cut ends so as not to come into contact with the tooth surfaces of the other of the pinion gear and the bull gear.