Hanging needle type oil nozzle for train traction motor
By adopting a combination structure of an inner conical oil outlet, steel ball, spring, and retaining ring in the needle-type oil nozzle of the train traction motor, the problem of poor sealing of traditional oil nozzles is solved, achieving excellent sealing effect and reliability of the oil nozzle, simplifying the production process, and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-13
- Publication Date
- 2026-04-07
AI Technical Summary
Existing needle-type oil nozzles for train traction motors suffer from oil leakage and seepage, affecting the safe operation of the motor. Furthermore, the traditional design has issues with inadequate sealing.
A needle-type grease nipple for train traction motors was designed, which adopts a combination structure of an inner conical grease nipple, a steel ball, a spring and a retaining ring. The spring length is not less than 70% of the length of the grease nipple body, and it is limited by the retaining ring and the snap ring. The needle and the grease nipple body are machined as a whole to ensure sealing.
It achieves excellent sealing effect for the nozzle, eliminates oil leakage, improves reliability and connection strength, simplifies production and assembly processes, and reduces production costs.
Smart Images
Figure CN224094233U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of rail vehicle manufacturing technology, specifically a needle-type grease fitting for a train traction motor. Background Technology
[0002] With the rapid development of my country's rail industry, the requirements for traction motors in rail vehicles are becoming increasingly stringent. The maturation of AC variable frequency speed control technology has improved the stability and reliability of AC traction motors. Consequently, the requirements for each component of the traction motor are also becoming more demanding. Pin-type grease fittings, installed at the motor end cover, provide timely grease replenishment to the front and rear bearing chambers. As the motor rotates, positive pressure is generated in the bearing chambers, placing increasingly higher demands on the sealing performance of the pin-type grease fittings. During normal system operation, there should be no grease leakage from the fittings, and during short-term high-load operation under high pressure, there should be no oil leakage. Currently available products on the market all exhibit oil leakage and seepage issues, with no corresponding solutions, posing potential quality risks to the safe operation of the motor. Utility Model Content
[0003] The purpose of this invention is to overcome the above-mentioned defects and propose a more reliable needle-type oil nozzle with a longer service life.
[0004] To achieve the above objectives, this utility model is implemented as follows:
[0005] A needle-type grease nipple for a train traction motor includes a grease nipple body with an inner conical grease outlet. A through hole is provided inside the grease nipple body along its axial direction. A steel ball is arranged in sequence in the through hole. A spring is arranged behind the steel ball. A retaining ring is arranged at the tail of the spring. The retaining ring is located in the through hole inside the grease nipple body and is embedded in the grease nipple body by a retaining ring.
[0006] The needle-type grease nipple used in the train traction motor has a spring with a length not less than 70% of the length of the grease nipple body. The spring applies a pushing force to the steel ball, causing it to block the oil outlet of the grease nipple body from the inside.
[0007] The aforementioned needle-type grease nipple for train traction motor also includes needles, which are respectively disposed on both sides of the outer wall of the grease nipple body, and are integral with the grease nipple body or welded together.
[0008] The needle-type oil nozzle proposed in this utility model, with the above-mentioned structural design, has the following advantages compared with the traditional needle-type oil nozzle:
[0009] a. Traditional needle-type grease fittings have internal springs that are too short and lack sufficient elasticity to compress the steel ball and achieve a sealing effect. Compared with these, the needle-type grease fitting proposed in this invention has a sufficiently long spring, and the elasticity can be adjusted by a retaining ring, resulting in a stable output thrust. At the same time, it ensures that the steel ball fits snugly against the conical ball seat of the grease fitting body, thereby achieving an excellent sealing effect and preventing oil leakage at the grease fitting port.
[0010] b. Traditional pin-type grease fittings involve drilling a hole in the outer wall of the fitting body and then pressing the pin into the hole using an interference fit. This method does not achieve a complete seal and gaps still exist, leading to oil leakage during application. In contrast, the pin-type grease fitting proposed in this invention uses a single-piece machining process for both the fitting body and the pin, ensuring strong pin connection while completely eliminating the risk of grease leakage at the pin.
[0011] c. The needle-type oil nozzle proposed in this utility model uses a retaining ring and a retaining ring at the tail of the spring for limiting, which ensures that the spring and the oil nozzle body are tightly connected and do not fall off, simplifying the production and assembly process while ensuring the reliability of use. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the structure of a traditional needle-loaded nozzle.
[0013] Figure 2 This is a schematic diagram of the structure of the needle-hanging nozzle proposed in this utility model. Detailed Implementation
[0014] The present invention will be further illustrated by specific embodiments below.
[0015] like Figure 2 As shown, a needle-type grease nipple for a train traction motor includes a grease nipple body 1 with an inner conical grease outlet. A through hole is provided inside the grease nipple body 1 along its axial direction. A steel ball 2 is arranged in sequence in the through hole. A spring 3 is arranged behind the steel ball 2. A retaining ring 4 is arranged at the tail of the spring 3. The retaining ring 4 is located in the through hole inside the grease nipple body 1 and is embedded in the grease nipple body 1 by a retaining ring.
[0016] The needle-type grease nipple used in the train traction motor has a spring with a length not less than 70% of the length of the grease nipple body. The spring applies a pushing force to the steel ball, causing it to block the oil outlet of the grease nipple body from the inside.
[0017] The aforementioned needle-type grease nipple for train traction motor also includes needles, which are respectively disposed on both sides of the outer wall of the grease nipple body, and are integral with the grease nipple body or welded together.
[0018] like Figure 1 , Figure 2 As shown, the needle-type oil nozzle proposed in this utility model, with the above-mentioned structural design, has the following advantages compared with the traditional needle-type oil nozzle:
[0019] a. Traditional needle-type grease fittings have internal springs that are too short and lack sufficient elasticity to compress the steel ball and achieve a sealing effect. Compared with these, the needle-type grease fitting proposed in this invention has a sufficiently long spring, and the elasticity can be adjusted by a retaining ring, resulting in a stable output thrust. At the same time, it ensures that the steel ball fits snugly against the conical ball seat of the grease fitting body, thereby achieving an excellent sealing effect and preventing oil leakage at the grease fitting port.
[0020] b. Traditional pin-type grease fittings involve drilling a hole in the outer wall of the fitting body and then pressing the pin into the hole using an interference fit. This method does not achieve a complete seal and gaps still exist, leading to oil leakage during application. In contrast, the pin-type grease fitting proposed in this invention uses a single-piece machining process for both the fitting body and the pin, ensuring strong pin connection while completely eliminating the risk of grease leakage at the pin.
[0021] c. The needle-type oil nozzle proposed in this utility model uses a retaining ring and a retaining ring at the tail of the spring for limiting, which ensures that the spring and the oil nozzle body are tightly connected and do not fall off, simplifying the production and assembly process while ensuring the reliability of use.
[0022] As can be seen from the above, the needle-type oil nozzle proposed in this utility model has good water tightness and air tightness, which can meet various working conditions; the structure is simple and novel, and the production and assembly are convenient, saving production costs; the elasticity of the oil nozzle steel ball is adjustable, which can adapt to the use of different types of grease.
Claims
1. A needle-type grease fitting for a train traction motor, comprising a fitting body with an inner conical grease outlet, characterized in that: The nozzle body has a through hole running along its axial direction inside. A steel ball is placed in the through hole, a spring is placed behind the steel ball, and a retaining ring is placed at the tail of the spring. The retaining ring is located in the through hole inside the nozzle body and is embedded in the nozzle body by a retaining ring.
2. The needle-type grease fitting for a train traction motor according to claim 1, characterized in that: The length of the spring is not less than 70% of the length of the nozzle body. The spring applies a pushing force to the steel ball, causing it to block the nozzle outlet of the nozzle body from the inside.
3. The needle-type grease fitting for a train traction motor according to claim 1 or 2, characterized in that: It also includes hanging pins, which are respectively disposed on both sides of the outer wall of the nozzle body, and are integral with the nozzle body or welded together.