WO2024040709A1 - 一种带有观测孔的轴承前密封装置 - Google Patents

一种带有观测孔的轴承前密封装置 Download PDF

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Publication number
WO2024040709A1
WO2024040709A1 PCT/CN2022/124602 CN2022124602W WO2024040709A1 WO 2024040709 A1 WO2024040709 A1 WO 2024040709A1 CN 2022124602 W CN2022124602 W CN 2022124602W WO 2024040709 A1 WO2024040709 A1 WO 2024040709A1
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WIPO (PCT)
Prior art keywords
sealing plug
bearing
observation hole
front cover
sealing
Prior art date
Application number
PCT/CN2022/124602
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English (en)
French (fr)
Inventor
夏克博
宋世勇
于长鑫
谭剑光
马忠超
顿丽华
田佩来
石佳艺
宫赫成
宋涛
张策
Original Assignee
瓦房店轴承集团有限责任公司
瓦房店轴承集团国家轴承工程技术研究中心有限公司
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Publication of WO2024040709A1 publication Critical patent/WO2024040709A1/zh

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
    • B61F15/00—Axle-boxes
    • B61F15/20—Details
    • B61F15/26—Covers; Sealing thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B39/00—Locking of screws, bolts or nuts
    • F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
    • F16B39/24—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by means of washers, spring washers, or resilient plates that lock against the object
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces

Definitions

  • the utility model belongs to the technical field of bearing assembly and manufacturing, and specifically relates to a bearing front sealing device with an observation hole applied to railway freight car bearings.
  • the bearing unit As the load-bearing unit of railway freight cars, the bearing unit is the basis for ensuring the stability and safety of railway freight cars.
  • the existing front sealing device of railway freight car bearings is a closed integral structure. When checking the condition and information of the shaft end, the entire front sealing device can only be removed. It is time-consuming and labor-intensive and is not conducive to the overall operation of the bearing.
  • this utility model is to provide a bearing front sealing device with an observation hole to facilitate inspection and observation of the condition of the bearing shaft end.
  • the technical solution adopted by the present utility model is: a bearing front sealing device with an observation hole, including a front cover arranged on one side of the bearing in the axial direction, and the front cover is provided with a through observation hole.
  • the observation hole is equipped with a sealing plug
  • the sealing plug is an interference fit with the hole wall of the observation hole
  • a number of grooves are provided on the side wall of the sealing plug in contact with the observation hole.
  • the bearing is sleeved on the end of the shaft, the front cover is detachably connected to the shaft, and the front cover is in contact with the end face of the inner ring of the bearing.
  • the front cover is connected and fixed with the shaft end surface through a number of connecting bolts.
  • an anti-loosening piece is provided on the side of the front cover away from the shaft end face, and the connecting bolts pass through the anti-loosing piece and the front cover in sequence and are connected to the shaft end face.
  • the anti-loosening piece is provided as a whole, and several connecting bolts pass through the same anti-loosing piece and are connected to the shaft end surface.
  • the anti-loosing piece is provided with a through hole corresponding to the sealing plug, so that the sealing plug is exposed through the through hole.
  • sealing plug is an elastic sealing plug capable of elastic deformation.
  • sealing plug is a rubber plug.
  • observation hole is located at the center of the front cover.
  • the sealing plug is a cylindrical plug body, and the connection between the circular surfaces at both ends of the cylindrical plug body and the middle side surface is chamfered; the diameter of the sealing plug is 55.3 mm.
  • groove section of the side wall of the sealing plug is arc-shaped, and each groove surrounds the side wall of the sealing plug; there are two grooves.
  • the utility model has an observation hole processed on the front cover, which can observe the condition of the axle when an abnormality occurs in the bearing or during maintenance, ensuring the normal operation of the bearing and increasing the service life of the bearing.
  • the sealing plug and the front cover have an interference fit, and grooves are designed on the side of the sealing plug to facilitate the assembly and disassembly of the sealing plug while ensuring the stable assembly of the sealing plug and prevent damage to the sealing plug during assembly and disassembly.
  • Figure 1 is a schematic structural diagram of a bearing front sealing device with an observation hole.
  • Figure 2 is a schematic diagram of the sealing plug structure.
  • a bearing front sealing device with an observation hole includes a front cover 1 arranged on one side of the bearing in the axial direction.
  • the front cover 1 is provided with a through observation hole, and is equipped with a
  • the sealing plug 2 is an elastic sealing plug capable of elastic deformation.
  • the sealing plug 2 is an interference fit with the hole wall of the observation hole.
  • Two semicircular grooves 5 are provided on the side wall of the sealing plug 2 in contact with the observation hole.
  • the front cover 1 is processed with an observation hole, which can observe the condition of the axle when an abnormality occurs in the bearing or during maintenance, to ensure the normal operation of the bearing and increase the service life of the bearing.
  • the sealing plug 2 and the front cover 1 have an interference fit, which can effectively ensure the sealing effect. Since the sealing plug 2 is an elastic component, in order to ensure the sealing performance is always in a compressed state during assembly, two semicircular grooves are designed on the side of the sealing plug 2 to reserve a certain deformation space for the elastic compression of the sealing plug 2, while ensuring the sealing. On the premise that the plug 2 is assembled stably, the assembly and disassembly of the sealing plug 2 is facilitated, and the sealing plug 2 is prevented from being damaged during the assembly and disassembly process.
  • the bearing 6 is set on the end of the shaft 7, the front cover 1 is connected and fixed with the shaft end surface through a number of connecting bolts 4, and the front cover 7 is in contact with the end surface of the bearing inner ring.
  • the front cover 1 is a circular body that matches the diameter of the bearing.
  • One side of the circular body has an annular protrusion that matches the end face of the bearing inner ring.
  • the end face of the annular protrusion matches the end face of the bearing inner ring.
  • the end face is in contact with the seal.
  • a number of connecting bolts 4 pass through the circular body and are connected to the shaft end face in the axial direction. There is a certain space between the circular body and the shaft end face to ensure that the connecting bolts can be tightened and the front cover is squeezed toward the bearing. Ensure the sealing performance of the front sealing device.
  • an anti-loosening piece 3 is provided on the side of the front cover 1 away from the end face of the shaft, and the connecting bolts 4 pass through the anti-loosening piece 3 and the front cover 1 in sequence and are connected to the end face of the shaft 7 .
  • the anti-loosening piece is provided as a whole, and several connecting bolts 4 pass through the same anti-loosing piece 3 and are connected to the shaft end surface to ensure the consistency of the installation positions of several connecting bolts.
  • the anti-loosening piece 3 is provided with a through hole corresponding to the sealing plug, so that the sealing plug is exposed through the through hole, ensuring that the anti-loosening piece 3 and the connecting bolt 4 do not interfere with the assembly of the sealing plug 2 .
  • the sealing plug 2 is a rubber plug.
  • the rubber plug is made of nitrile rubber. Compared with ordinary rubber, it has better sealing and is not easy to age. Changes in ambient temperature have little impact on the material, which can prevent the rubber plug from falling off during the operation of the truck. Good sealing can prevent dust and Rain, etc. affect the service life of bearings.
  • observation hole is located at the center of the front cover 1 . It is convenient to observe the conditions everywhere at the shaft end.
  • the sealing plug 2 is a cylindrical plug body, and the connection between the circular surfaces at both ends of the cylindrical plug body and the middle side surface is chamfered; the diameter of the sealing plug is 55.3 mm.
  • the thickness of the sealing plug 1 is greater than that of the front cover 1, which facilitates installation, disassembly and sealing.
  • the diameter of the through hole corresponding to the sealing plug 2 on the anti-loosening piece 3 is 60 mm, which is larger than the diameter of the sealing plug 2. The sealing plug 2 can be completely exposed without affecting the installation and removal of the sealing plug 2.
  • the outer surface of the cylindrical plug is excessively smooth and evenly stressed, making it easy to assemble and disassemble.
  • the semicircular grooves on the side wall of the sealing plug have an arc-shaped cross-section, and each groove surrounds the side wall of the sealing plug.
  • the bearing front sealing device of this utility model has been trial-produced.
  • the rubber plug has good assembly performance and reliable sealing performance.
  • first and second are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as “first” and “second” may explicitly or implicitly include at least one of these features.
  • “plurality” means at least two, such as two, three, etc., unless otherwise clearly and specifically limited.
  • connection In this utility model, unless otherwise expressly stipulated and limited, the terms “installation”, “connection”, “connection”, “fixing” and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or integration; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or an interaction between two elements, unless otherwise Clear limits.
  • connection or integration
  • connection can be a mechanical connection or an electrical connection
  • it can be a direct connection or an indirect connection through an intermediate medium
  • it can be an internal connection between two elements or an interaction between two elements, unless otherwise Clear limits.
  • specific meanings of the above terms in the present invention can be understood according to specific circumstances.
  • the first feature "on” or “below” the second feature may be that the first and second features are in direct contact, or the first and second features are in direct contact through an intermediate medium. indirect contact.
  • the terms “above”, “above” and “above” the first feature is above the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature.
  • "Below”, “below” and “beneath” the first feature to the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.

Abstract

一种应用于铁路货车轴承的带有观测孔的轴承前密封装置，包括设置在轴承（6）轴向一侧的前盖（1），前盖（1）上设置有贯通的观测孔，观测孔内装配有密封塞（2），密封塞（2）与观测孔的孔壁过盈配合，密封塞（2）与观测孔接触的侧壁上设置若干凹槽（5）；密封塞（2）为能够弹性形变的弹性密封塞；密封塞（2）侧壁的凹槽（5）截面为圆弧形，每个凹槽（5）在密封塞（2）侧壁环绕一周。前盖（1）上加工有观测孔，可在轴承（6）出现异常情况或检修时，观测车轴（7）的状况，保证轴承（6）运转正常，提高轴承（6）使用寿命。密封塞（2）和前盖（1）为过盈配合，密封塞（2）侧面设计凹槽（5），在保证密封塞（2）装配稳定的前提下，方便密封塞（2）的装配和拆卸，防止密封塞（2）在装配和拆卸过程中发生损坏。

Description

一种带有观测孔的轴承前密封装置 技术领域
本实用新型属于轴承装配制造技术领域，具体涉及一种应用于铁路货车轴承的带有观测孔的轴承前密封装置。
 背景技术
铁路货车运输作为现代社会的一种运输方式，在安全、经济、效率等方面都具有极为明显的优势。轴承单元作为铁路货车的承载单元，是保证铁路货车运输稳定和安全的基础。
 技术问题
现有的铁路货车的轴承，前密封装置为封闭式整体结构，查看轴端状况和信息时，只能卸掉整个前密封装置。费时费力且不利于轴承的整体运行。
 技术解决方案
根据上述现有技术存在的缺陷，本实用新型的目的是提供一种带有观测孔的轴承前密封装置，便于对轴承轴端状况进行检查和观测。
为实现上述目的，本实用新型所采用的技术方案为：一种带有观测孔的轴承前密封装置，包括设置在轴承轴向一侧的前盖，所述前盖上设置有贯通的观测孔，观测孔内装配有密封塞，所述密封塞与观测孔的孔壁过盈配合，密封塞与观测孔接触的侧壁上设置若干凹槽。
进一步地，所述轴承套装在轴端部，前盖与轴可拆卸连接，前盖与轴承内圈端面接触。
进一步地，所述前盖通过若干连接螺栓与轴端面连接固定。
进一步地，所述前盖远离轴端面的一侧设置防松片，连接螺栓依次穿过防松片与前盖并连接至轴端面上。
进一步地，所述防松片为整体设置，若干连接螺栓穿过同一防松片连接至轴端面上，所述防松片上设置与密封塞相对应的通孔，使密封塞通过通孔露出。
进一步地，所述密封塞为能够弹性形变的弹性密封塞。
进一步地，所述密封塞为橡胶塞。
进一步地，所述观测孔位于前盖的中心位置。
进一步地，所述密封塞为圆柱形塞体，圆柱形塞体两端的圆形表面和中间的侧表面的连接处设置倒角；所述密封塞的直径为55.3mm。
进一步地，所述密封塞侧壁的凹槽截面为圆弧形，每个凹槽在密封塞侧壁环绕一周；所述凹槽为两个。
 有益效果
本实用新型的有益效果为：本实用新型在前盖上加工有观测孔，可在轴承出现异常情况或检修时，观测车轴的状况，保证轴承运转正常，提高轴承使用寿命。密封塞和前盖为过盈配合，密封塞侧面设计凹槽，在保证密封塞装配稳定的前提下，方便密封塞的装配和拆卸，防止密封塞在装配和拆卸过程中发生损坏。
 附图说明
图1为带有观测孔的轴承前密封装置结构示意图。
图2为密封塞结构示意图。
图中：1、前盖， 2、密封塞， 3、防松片， 4、连接螺栓， 5、凹槽， 6、轴承， 7、轴。
 本发明的最佳实施方式
为使本实用新型的上述目的、特征和优点能够更加明显易懂，下面结合附图对本实用新型的具体实施方式做详细的说明。在下面的描述中阐述了很多具体细节以便于充分理解本实用新型。但是本实用新型能够以很多不同于在此描述的其它方式来实施，本领域技术人员可以在不违背本实用新型内涵的情况下做类似改进，因此本实用新型不受下面公开的具体实施例的限制。
参见附图1-2，一种带有观测孔的轴承前密封装置，包括设置在轴承轴向一侧的前盖1，所述前盖1上设置有贯通的观测孔，观测孔内装配有密封塞2，所述密封塞2为能够弹性形变的弹性密封塞，密封塞2与观测孔的孔壁过盈配合，密封塞2与观测孔接触的侧壁上设置两个半圆凹槽5。
基于上述技术方案，需要说明的是，前盖1上加工有观测孔，可在轴承出现异常情况或检修时，观测车轴的状况，保证轴承运转正常，提高轴承使用寿命。密封塞2和前盖1为过盈配合，能够有效保证密封效果。由于密封塞2为弹性部件，在装配时为保证密封性始终处于压缩状态，因此在密封塞2侧面设计两个半圆凹槽，为密封塞2的弹性压缩预留一定的变形空间，在保证密封塞2装配稳定的前提下，方便密封塞2的装配和拆卸，防止密封塞2在装配和拆卸过程中发生损坏。
 本发明的实施方式
进一步地，所述轴承6套装在轴7端部，前盖1通过若干连接螺栓4与轴端面连接固定，前盖7与轴承内圈端面接触。
进一步地，所述前盖1为与轴承直径相适配的圆形主体，圆形主体的一侧带有与轴承内圈端面配合的环状凸体，环状凸体的端面与轴承内圈端面接触密封，若干连接螺栓4穿过圆形主体沿轴向连接至轴端面上，圆形主体与轴端面之间具有一定空间，保证连接螺栓能够旋紧，将前盖向轴承方向挤压，保证前密封装置的密封性。
进一步地，所述前盖1远离轴端面的一侧设置防松片3，连接螺栓4依次穿过防松片3与前盖1并连接至轴7端面上。所述防松片为整体设置，若干连接螺栓4穿过同一防松片3连接至轴端面上，保证若干连接螺栓安装位置的一致性。所述防松片3上设置与密封塞相对应的通孔，使密封塞通过通孔露出，保证防松片3与连接螺栓4不干涉密封塞2的装配。
进一步地，所述密封塞2为橡胶塞。橡胶塞材料采用丁腈橡胶，和普通橡胶相比，密封性更好，不易老化，环境温度变化对材料影响小，可防止货车在运行过程中，橡胶塞脱落，良好的密封性可防止灰尘和雨水等影响轴承使用寿命。
进一步地，所述观测孔位于前盖1的中心位置。便于对轴端各处的情况进行观测。
进一步地，所述密封塞2为圆柱形塞体，圆柱形塞体两端的圆形表面和中间的侧表面的连接处设置倒角；所述密封塞的直径为55.3mm。所述密封塞1的厚度大于前盖1的厚度，便于安装、拆卸及密封。防松片3上与密封塞2相对应的通孔的直径为60mm，大于密封塞2的直径，能够将密封塞2完全露出并不影响密封塞2的安装于拆卸。
基于上述技术方案，需要说明的是，圆柱形塞体外表面过度圆滑，受力均匀，便于装配和拆卸。
进一步地，所述密封塞侧壁的半圆凹槽具体为截面为圆弧形，每个凹槽在密封塞侧壁环绕一周。
本实用新型的轴承前密封装置已经试制完成，橡胶塞装配性良好，密封性可靠。
 工业实用性
在本实用新型的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附  图所示的方位或位置关系，仅是为了便于描述本实用新型和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本实用新型的限制。
此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本实用新型的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
在本实用新型中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本实用新型中的具体含义。
在本实用新型中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。而且，第一特征在第二特征“之上”、“上方”和“上面”可是第一特征在第二特征正上方或斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”可以是第一特征在第二特征正下方或斜下方，或仅仅表示第一特征水平高度小于第二特征。
需要说明的是，当元件被称为“固定于”或“设置于”另一个元件，它可以直接在另一个元件上或者也可以存在居中的元件。当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。本文所使用的术语“垂直的”、“水平的”、“上”、“下”、“左”、“右”以及类似的表述只是为了说明的目的，并不表示是唯一的实施方式。
    以上列举的仅是本实用新型的最佳实施例。显然，本实用新型不限于以上实施例，还可以有许多变形。本领域的普通技术人员能从本实用新型公开的内容直接导出或联想到的所有变形，均应认为是本实用新型的保护范围。

Claims (9)

  1. 一种带有观测孔的轴承前密封装置，其特征在于：包括设置在轴承轴向一侧的前盖，所述前盖上设置有贯通的观测孔，观测孔内装配有密封塞，所述密封塞与观测孔的孔壁过盈配合，密封塞与观测孔接触的侧壁上设置若干凹槽；所述密封塞为能够弹性形变的弹性密封塞；所述密封塞侧壁的凹槽截面为圆弧形，每个凹槽在密封塞侧壁环绕一周。
  2. 根据权利要求1所述的一种带有观测孔的轴承前密封装置，其特征在于：所述轴承套装在轴端部，前盖与轴可拆卸连接，前盖与轴承内圈端面接触。
  3. 根据权利要求2所述的一种带有观测孔的轴承前密封装置，其特征在于：所述前盖通过若干连接螺栓与轴端面连接固定。
  4. 根据权利要求3所述的一种带有观测孔的轴承前密封装置，其特征在于：所述前盖远离轴端面的一侧设置防松片，连接螺栓依次穿过防松片与前盖并连接至轴端面上。
  5. 根据权利要求4所述的一种带有观测孔的轴承前密封装置，其特征在于：所述防松片为整体设置，若干连接螺栓穿过同一防松片连接至轴端面上，所述防松片上设置与密封塞相对应的通孔，使密封塞通过通孔露出。
  6. 根据权利要求1所述的一种带有观测孔的轴承前密封装置，其特征在于：所述密封塞为橡胶塞。
  7. 根据权利要求1所述的一种带有观测孔的轴承前密封装置，其特征在于：所述观测孔位于前盖的中心位置。
  8. 根据权利要求1所述的一种带有观测孔的轴承前密封装置，其特征在于：所述密封塞为圆柱形塞体，圆柱形塞体两端的圆形表面和中间的侧表面的连接处设置倒角；所述密封塞的直径为55.3mm。
  9. 根据权利要求1所述的一种带有观测孔的轴承前密封装置，其特征在于：所述凹槽为两个。
PCT/CN2022/124602 2022-08-25 2022-10-11 一种带有观测孔的轴承前密封装置 WO2024040709A1 (zh)

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CN115289141A (zh) * 2022-08-25 2022-11-04 瓦房店轴承集团有限责任公司 带有观测孔的轴承前密封装置

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