TWI843847B - Sealing structure - Google Patents

Abstract

A sealing structure (1) includes a first member (11) having a cylindrical portion, a second member (6) and an annular sealing member (7) configured to seal a space between the first member (11) and the second member (6), the space being supplied with a lubricant. The annular sealing member (7) includes: a fixing portion fixed to the first member (11); a rubber lip portion (31) having a base portion (31a) extending in a first axial direction from the fixing portion and a contacting portion (31c) configured to contact the sealing surface (41); a pressing member provided between the base portion (31a) and the contacting portion (31c) to press the contacting portion (31c) toward the sealing surface (41); and a supporting portion (45) provided along the base portion (31a) and having higher rigidity than the base portion (31a).

Description

密封構造Sealing structure

本發明有關設置在二個相對彼此旋轉的構件之間的密封構造、例如於十字接頭中之軸桿部分和軸承杯。 The present invention relates to a sealing structure disposed between two components that rotate relative to each other, such as a shaft portion and a bearing cup in a cross joint.

例如，在軋鋼機的主軸裝置或汽車之驅動軸桿中，於軸桿之間的連接部分處將十字接頭用作萬向接頭。十字接頭具有十字軸桿、軸承杯、和複數滾針。十字軸桿具有以十字形狀配置之四個軸桿部分。軸承杯具有觸底的圓柱形狀並覆蓋每一軸桿部分。滾針配置在軸桿部分之外周邊表面與軸承杯的內周邊表面之間，以便能夠相對於軸桿部分和軸承杯滾動的。設置在每一軸桿部分之端部的軛件連接至軸承杯。於軸桿部分之基底端部與軸承杯的端部之間設置有密封構造。這抑制水等進入設置在軸桿部分和軸承杯之間的滾針之容納空間，且亦抑制潤滑劑從容納空間洩漏至外側(例如，參見日本待審專利申請案公告 第2018-80828(JP 2018-80828 A)號)。 For example, in a main shaft device of a steel rolling machine or a drive shaft of an automobile, a cross joint is used as a universal joint at a connection portion between shafts. The cross joint has a cross shaft, a bearing cup, and a plurality of needle rollers. The cross shaft has four shaft portions arranged in a cross shape. The bearing cup has a bottomed cylindrical shape and covers each shaft portion. The needle roller is arranged between the outer peripheral surface of the shaft portion and the inner peripheral surface of the bearing cup so as to be able to roll relative to the shaft portion and the bearing cup. A shaft provided at the end of each shaft portion is connected to the bearing cup. A sealing structure is provided between the base end of the shaft portion and the end of the bearing cup. This inhibits water and the like from entering the roller accommodation space provided between the shaft portion and the bearing cup, and also inhibits the lubricant from leaking from the accommodation space to the outside (for example, see Japanese Unexamined Patent Application Announcement No. 2018-80828 (JP 2018-80828 A)).

於JP 2018-80828A中揭示的密封構造包括環形密封構件107，其附接至軸承杯111並接觸擋油圈106，以便可相對於擋油圈106滑動，如圖11所示。擋油圈106具有徑向面朝內之密封表面141。密封構件107包括金屬構件134、唇部131、和環帶彈簧151。金屬構件134固定至軸承杯111。唇部131附著至金屬構件134並接觸密封表面141。環帶彈簧151將唇部131壓按朝密封表面141。 The sealing structure disclosed in JP 2018-80828A includes an annular sealing member 107, which is attached to the bearing cup 111 and contacts the oil baffle 106 so as to be slidable relative to the oil baffle 106, as shown in FIG. 11. The oil baffle 106 has a sealing surface 141 with a radial surface facing inward. The sealing member 107 includes a metal member 134, a lip 131, and an annular spring 151. The metal member 134 is fixed to the bearing cup 111. The lip 131 is attached to the metal member 134 and contacts the sealing surface 141. The annular spring 151 presses the lip 131 toward the sealing surface 141.

當擋油圈106和軸承杯111之間的空間(潤滑空間)以潤滑劑(油脂)潤滑時，在維護等期間施行用新的潤滑劑替換潤滑空間中之潤滑劑的操作。因此，需要從注油孔供給新的潤滑劑，並將舊的潤滑劑從唇部131和密封表面141之間的空間排出至外側。然而，於圖11中所示密封構造之案例中，當新的潤滑劑供給至潤滑空間時，潤滑劑之內部壓力造成將唇部131壓抵靠著密封表面141的力量，如圖12中之箭頭c中所示。然後，唇部131的實質上面向密封表面141之整個側表面131c2強有力地接觸密封表面141。因此，其係難以經過唇部131和密封表面141之間的空間將潤滑劑排出至潤滑空間外側。 When the space (lubricating space) between the oil baffle 106 and the bearing cup 111 is lubricated with lubricant (grease), an operation of replacing the lubricant in the lubricating space with new lubricant is performed during maintenance, etc. Therefore, it is necessary to supply new lubricant from the oil filling hole and discharge the old lubricant from the space between the lip 131 and the sealing surface 141 to the outside. However, in the case of the sealing structure shown in FIG. 11, when new lubricant is supplied to the lubricating space, the internal pressure of the lubricant causes a force that presses the lip 131 against the sealing surface 141, as shown in arrow c in FIG. 12. Then, substantially the entire side surface 131c2 of the lip 131 facing the sealing surface 141 strongly contacts the sealing surface 141. Therefore, it is difficult to discharge the lubricant to the outside of the lubrication space through the space between the lip 131 and the sealing surface 141.

本揭示內容之發明提供用於密封以潤滑劑供給的空間(潤滑空間)之密封構造，當供給新潤滑劑時，所述密封構造可改善舊潤滑劑的排出性能。 The invention disclosed herein provides a sealing structure for sealing a space (lubricating space) supplied with lubricant, and when new lubricant is supplied, the sealing structure can improve the discharge performance of old lubricant.

根據本發明之態樣的密封構造包括：第一構件，具有圓柱形部分；第二構件，具有主要本體，所述主要本體坐落在圓柱形部分的徑向內側，並與第一構件同心地設置，以便相對於第一構件旋轉；及環狀密封構件，其附接至第一構件且建構成密封第一構件與第二構件之間的空間，而以潤滑劑供給所述空間。第二構件更包括第一延伸部分和第二延伸部分，第一延伸部分從主要本體之一部分徑向往外地延伸在第一軸向側上，第二延伸部分從第一延伸部分的徑向外端延伸於第二軸向方向中，並設有徑向面朝內之密封表面。環狀密封構件包括：固定部分，固定至第一構件；橡膠唇部，具有基底部分、接觸部分、及連接部分，所述基底部分從固定部分在第一軸向方向中延伸，接觸部分於基底部分的徑向往外處設有在接觸部分與基底部分之間的間隙，並建構成接觸密封表面，及連接部分連接第一軸向側上之基底部分的一部分和第一軸向側上之接觸部分的一部分；壓按構件，設於基底部分及接觸部分之間，以將接觸部分壓按朝密封表面；及支撐部分，沿著基底部分設置，且具有比基底部分更高的剛性。 The sealing structure according to the aspect of the present invention includes: a first member having a cylindrical portion; a second member having a main body, the main body being located radially inward of the cylindrical portion and being arranged concentrically with the first member so as to rotate relative to the first member; and an annular sealing member attached to the first member and configured to seal a space between the first member and the second member, and supplying the space with a lubricant. The second member further includes a first extension portion and a second extension portion, the first extension portion extending radially outwardly from a portion of the main body on a first axial side, and the second extension portion extending from a radially outer end of the first extension portion in a second axial direction and having a sealing surface facing radially inward. The annular sealing member includes: a fixing portion fixed to a first member; a rubber lip having a base portion, a contact portion, and a connecting portion, wherein the base portion extends from the fixing portion in a first axial direction, the contact portion is provided with a gap between the contact portion and the base portion radially outward of the base portion, and is constructed to form a contact sealing surface, and the connecting portion connects a portion of the base portion on the first axial side and a portion of the contact portion on the first axial side; a pressing member provided between the base portion and the contact portion to press the contact portion toward the sealing surface; and a supporting portion provided along the base portion and having a higher rigidity than the base portion.

在密封構造中，高剛性之支撐部分係沿著橡膠唇部的基底設置。如此，其係可能由於供給至第一構件及第二構件之間的空間之潤滑劑的壓力，而抑制唇部強有力地壓按密封表面。因此，可在供給新潤滑劑時改善舊潤滑劑之排出性能。 In the sealing structure, a high-rigidity support portion is provided along the base of the rubber lip. Thus, it is possible to suppress the lip from strongly pressing the sealing surface due to the pressure of the lubricant supplied to the space between the first member and the second member. Therefore, the discharge performance of the old lubricant can be improved when the new lubricant is supplied.

於上面態樣中，固定部分可具有附接至第一 構件之金屬構件，及支撐部分可與金屬構件分開。即使當金屬構件和支撐部分的其中一者或兩者具有/具有彎曲部分時，金屬構件和支撐部分可分開地製造，這有利於所述製造。 In the above aspect, the fixing portion may have a metal member attached to the first member, and the supporting portion may be separated from the metal member. Even when one or both of the metal member and the supporting portion have/have a bent portion, the metal member and the supporting portion may be manufactured separately, which facilitates the manufacturing.

在上面態樣中，支撐部分可具有圓柱形支撐本體部分和輔助部分，所述圓柱形支撐本體部分於軸向方向中沿著基底部分延伸，且輔助部分係與圓柱形支撐本體部分一體形成，並建構成於軸向方向中接觸金屬構件之一部分。在此案例中，當模製橡膠唇部、支撐部分和包括金屬構件的密封構件以便整合時，支撐部分軸向地接觸金屬構件之一部分，從而便於支撐部分和金屬部分支撐在軸向方向中。 In the above embodiment, the support portion may have a cylindrical support body portion and an auxiliary portion, wherein the cylindrical support body portion extends along the base portion in the axial direction, and the auxiliary portion is formed integrally with the cylindrical support body portion and is constructed to contact a portion of the metal member in the axial direction. In this case, when the rubber lip, the support portion, and the sealing member including the metal member are molded for integration, the support portion axially contacts a portion of the metal member, thereby facilitating the support portion and the metal portion to be supported in the axial direction.

於上面態樣中，金屬構件可具有附接至第一構件之圓柱形部分和從圓柱形部分徑向朝內延伸的環狀部分。輔助部分可從圓柱形支撐本體部分之第二軸向端部徑向朝內地延伸，並具有環狀形狀。輔助部分的徑向內端可相對於環狀部分之徑向內端進一步徑向朝內突出。於此案例中，當使用模具將橡膠唇部、支撐部分、及包括金屬構件的密封構件一體成形時，可將所述模具之一部分帶入與輔助部分的徑向往內突出之端部接觸。這有助於將支撐部分定位在徑向方向中。 In the above embodiment, the metal member may have a cylindrical portion attached to the first member and an annular portion extending radially inward from the cylindrical portion. The auxiliary portion may extend radially inward from the second axial end of the cylindrical support body portion and have an annular shape. The radial inner end of the auxiliary portion may further protrude radially inward relative to the radial inner end of the annular portion. In this case, when the rubber lip, the support portion, and the sealing member including the metal member are integrally formed using a mold, a portion of the mold may be brought into contact with the radially inwardly protruding end of the auxiliary portion. This helps to position the support portion in the radial direction.

於上面態樣中，接觸部分可具有面向密封表面之面向表面；及所述面向表面可具有完全接觸區域和部分接觸區域，所述完全接觸區域設在對應於空間外側的第 二軸向側上之面向表面的一部分中，並建構成接觸所述完全接觸區域之整個圓周上的密封表面，且所述部分接觸區域設在對應於空間側之第一軸向側上的面向表面之一部分中，並建構成在所述部分接觸區域的圓周方向中不連續地接觸密封表面。根據上面構造，即使當所述唇部藉由供給至空間之潤滑劑壓按抵靠著密封表面時，於面向表面的部分接觸區域中存在未接觸密封表面之部分。因此，當潤滑劑進入所述部分時，潤滑劑向上推動完全接觸區域且排出至空間的外側。因此，當供給新潤滑劑時可進一步改善舊潤滑劑之排出性能。再者，由於面向表面具有完全接觸區域，所以確保密封性能。 In the above aspect, the contact portion may have a facing surface facing the sealing surface; and the facing surface may have a full contact area and a partial contact area, the full contact area being provided in a portion of the facing surface on the second axial side corresponding to the outer side of the space and being constructed to contact the sealing surface on the entire circumference of the full contact area, and the partial contact area being provided in a portion of the facing surface on the first axial side corresponding to the space side and being constructed to contact the sealing surface discontinuously in the circumferential direction of the partial contact area. According to the above configuration, even when the lip is pressed against the sealing surface by the lubricant supplied to the space, there is a portion in the partial contact area of the facing surface that does not contact the sealing surface. Therefore, when the lubricant enters the portion, the lubricant pushes the complete contact area upward and is discharged to the outside of the space. Therefore, the discharge performance of the old lubricant can be further improved when the new lubricant is supplied. Furthermore, since the facing surface has a complete contact area, the sealing performance is ensured.

在上面態樣中，壓按構件可為環帶彈簧；及所述完全接觸區域與部分接觸區域之間的邊界可為坐落於第一軸向側上的環帶彈簧之端部與環帶彈簧的中心之間的軸向範圍中。根據上面組構，當邊界相對於環帶彈簧之中心坐落更靠近潤滑空間側時，相對於第一密封表面的完全接觸區域之表面壓力在潤滑空間外側的完全接觸區域之端部指示峰值。因此，可適當地抑制水等從潤滑空間外側的空間進入，並可適當地維持密封性能。 In the above embodiment, the pressing member may be an annular spring; and the boundary between the full contact area and the partial contact area may be in the axial range between the end of the annular spring located on the first axial side and the center of the annular spring. According to the above structure, when the boundary is located closer to the lubricating space side relative to the center of the annular spring, the surface pressure of the full contact area relative to the first sealing surface indicates a peak at the end of the full contact area outside the lubricating space. Therefore, water or the like can be properly inhibited from entering from the space outside the lubricating space, and the sealing performance can be properly maintained.

根據上面態樣之密封構造，於密封以潤滑劑供給的空間之密封構造中，其係可能當供給新潤滑劑時改善舊潤滑劑的排出性能。 According to the sealing structure of the above aspect, in the sealing structure for sealing a space supplied with lubricant, it is possible to improve the discharge performance of the old lubricant when supplying new lubricant.

1:密封構造 1: Sealing structure

2:十字軸桿 2: Cross shaft

3:基底 3: Base

3a:注油孔 3a: Oil filling hole

4:軸桿部分 4: Shaft part

5:滾動軸承部分 5: Rolling bearing part

6:擋油圈 6: Oil retaining ring

6a:擋油圈本體 6a: Oil retaining ring body

6b:第一延伸部分 6b: First extension part

6c:第二延伸部分 6c: Second extension part

6d:第三延伸部分 6d: The third extension

7:密封構件 7: Sealing components

8:滾子導件 8: Roller guide

9:滾針 9: Rolling needle

10:墊圈 10: Gasket

11:軸承杯 11: Bearing cup

11a:注油孔 11a: Oil filling hole

13:注油路徑 13: Oil filling path

14:圓柱形部分 14: Cylindrical part

15:圓盤狀部分 15: Disc-shaped part

17:軛件 17:Yoke

20:十字接頭 20: Cross joint

31:唇部 31: Lips

31a:基底部分 31a: Base part

31b:連接部分 31b: Connection part

31c:接觸部分 31c: Contact part

31c2:面向表面 31c2: Surface facing

32:唇部 32: Lips

32a:凹部 32a: Concave part

33:唇部 33: Lips

34:金屬構件 34:Metal components

34a:第一金屬構件 34a: First metal component

34a1:第一圓柱形部分 34a1: first cylindrical part

34a2:第一環形部分 34a2: First annular part

34b:第二金屬構件 34b: Second metal component

34b1:第二圓柱形部分 34b1: Second cylindrical part

34b2:第二環形部分 34b2: Second annular part

35:圓柱形部分 35: Cylindrical part

41:密封表面 41: Sealing surface

42:密封表面 42: Sealing surface

43:密封表面 43: Sealing surface

45:支撐部分 45: Support part

46:支撐本體部分 46: Support the main body

46a:端部 46a: End

47:輔助部分 47: Auxiliary part

47a:內端 47a: Inner end

48a:內端 48a: Inner end

51:環帶彈簧 51: Ring spring

51a:中心 51a: Center

51b:端部 51b: End

52:環帶彈簧 52: Ring spring

61:溝槽 61: Groove

61a:深溝槽部分 61a: Deep groove part

61b:淺溝槽部分 61b: Shallow groove part

65:部分 65: Partial

66:部分 66: Partial

106:擋油圈 106: Oil retaining ring

107:密封構件 107: Sealing component

111:軸承杯 111: Bearing cup

131:唇部 131: Lips

131c2:側表面 131c2: Side surface

134:金屬構件 134:Metal components

141:密封表面 141: Sealing surface

151:環帶彈簧 151: Ring spring

R1:完全接觸區域 R1: Full contact area

R2:部分接觸區域 R2: Partial contact area

S:容納空間 S: Accommodation space

下面將參考附圖敘述本發明之示範實施例的特徵、優點、及技術和工業意義，其中類似符號指示類似元件，且其中：[圖1]係應用密封構造之十字接頭的局部分解立體圖；[圖2]係十字接頭之側視圖(局部剖視圖)；[圖3]係密封構造的剖視圖；[圖4]係密封構造之密封構件的剖視圖；[圖5]係顯示密封構件之第一唇部的功能之剖視圖；[圖6A]係從圖5中的箭頭E所視之示意圖；[圖6B]係從圖5中的箭頭F所視之示意圖；[圖7A]係顯示未施加潤滑劑的供給壓力之第一唇部的剖視圖；[圖7B]係顯示施加潤滑劑之供給壓力的第一唇部之剖視圖；[圖8A]係顯示相對於密封構造的第一密封表面之完全接觸區域中的表面壓力中之變化的說明圖；[圖8B]係顯示相對於密封構造的第一密封表面之完全接觸區域中的表面壓力中之變化的說明圖；[圖9A]係與圖6A對應之示意圖，並顯示第一唇部的溝槽之修改；[圖9B]係與圖6B對應的示意圖，並顯示第一唇部之溝槽的修改；[圖10]係顯示將支撐部分固定至模具之狀態的說明 圖；[圖11]係根據相關技術領域之密封構造的剖視圖；和[圖12]係根據相關技術領域之密封構造的剖視圖，其顯示施加潤滑劑之供給壓力的唇部。 The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which similar symbols indicate similar elements, and in which: [FIG. 1] is a partially exploded three-dimensional view of a cross joint applying a sealing structure; [FIG. 2] is a side view (partial cross-sectional view) of the cross joint; [FIG. 3] is a cross-sectional view of the sealing structure; [FIG. 4] is a cross-sectional view of a sealing member of the sealing structure; [FIG. 5] is a cross-sectional view showing the function of the first lip of the sealing member; [FIG. 6A] is a schematic view as viewed from arrow E in FIG. 5; [FIG. 6B] is a schematic view as viewed from arrow F in FIG. 5; [FIG. 7A] is a cross-sectional view showing the first lip with supply pressure without lubricant applied; [FIG. 7B] is a cross-sectional view showing the first lip with supply pressure applied ; [FIG. 8A] is an explanatory diagram showing changes in surface pressure in a full contact area relative to the first sealing surface of the sealing structure; [FIG. 8B] is an explanatory diagram showing changes in surface pressure in a full contact area relative to the first sealing surface of the sealing structure; [FIG. 9A] is a schematic diagram corresponding to FIG. 6A, and shows a modification of the groove of the first lip; [FIG. 9B] is a schematic diagram corresponding to FIG. 6B, and shows a modification of the groove of the first lip; [FIG. 10] is an explanatory diagram showing a state where the support portion is fixed to the mold; [FIG. 11] is a sectional diagram of a sealing structure according to the related art; and [FIG. 12] is a sectional diagram of a sealing structure according to the related art, which shows a lip applying a supply pressure of a lubricant.

密封構造和十字接頭 Sealing structure and cross joints

圖1係應用密封構造之十字接頭的局部分解立體圖，及圖2係十字接頭之側視圖(局部剖視圖)。例如在軋鋼機的主軸裝置(未示出)中使用十字接頭20。如圖1中所示，十字接頭20包括十字軸桿2、滾動軸承部分5、和一對軛件17。十字軸桿2具有四個軸桿部分4。每一滾動軸承部分5配置於每一軸桿部分4上。 FIG. 1 is a partially exploded perspective view of a cross joint to which a sealing structure is applied, and FIG. 2 is a side view (partial cross-sectional view) of the cross joint. For example, a cross joint 20 is used in a main shaft device (not shown) of a steel rolling mill. As shown in FIG. 1 , the cross joint 20 includes a cross shaft 2, a rolling bearing portion 5, and a pair of axles 17. The cross shaft 2 has four shaft portions 4. Each rolling bearing portion 5 is disposed on each shaft portion 4.

十字軸桿2具有基底3和四個軸桿部分4。基底3設置在十字軸桿2之中心。軸桿部分4從基底3沿著彼此正交的軸線X和軸線Z於四個方向中延伸。十字軸桿2可與軛件17一起繞著中心軸線C旋轉。中心軸線C通過基底3之中心並與軸桿部分4的軸線X和軸線Z正交。用於將潤滑劑供給至滾動軸承部分5之內側的注油路徑13提供於十字軸桿2中及沿著軸線X和軸線Z呈十字形狀。 The cross shaft 2 has a base 3 and four shaft portions 4. The base 3 is provided at the center of the cross shaft 2. The shaft portions 4 extend from the base 3 in four directions along the axes X and Z that are orthogonal to each other. The cross shaft 2 can rotate around the center axis C together with the shaft 17. The center axis C passes through the center of the base 3 and is orthogonal to the axes X and Z of the shaft portions 4. An oil injection path 13 for supplying a lubricant to the inner side of the rolling bearing portion 5 is provided in the cross shaft 2 and in a cross shape along the axes X and Z.

如圖2中所示，注油孔3a提供在十字軸桿2之基底3中，且注油孔11a提供於稍後敘述的滾動軸承部分5之軸承杯11中。注油孔3a、11a連接至注油路徑13。潤滑劑經過注油孔3a、11a和注油路徑13供給進入滾動軸承部 分5。在本實施例中，油脂係用作潤滑劑。油脂可於包括十字接頭20的裝置之操作期間供給，或可周期性地供給(例如，每1-3個月)。 As shown in FIG. 2 , an oiling hole 3a is provided in the base 3 of the cross shaft 2, and an oiling hole 11a is provided in the bearing cup 11 of the rolling bearing portion 5 described later. The oiling holes 3a, 11a are connected to the oiling path 13. The lubricant is supplied into the rolling bearing portion 5 through the oiling holes 3a, 11a and the oiling path 13. In the present embodiment, grease is used as the lubricant. The grease may be supplied during the operation of the device including the cross joint 20, or may be supplied periodically (e.g., every 1-3 months).

每一滾動軸承部分5包括上述軸桿部分4、複數滾針9、和軸承杯11。滾針9沿著每一軸桿部分4的外周邊表面配置，以便可在其上面滾動。軸承杯11具有觸底之圓柱形狀。亦即，軸承杯11具有圓柱形部分14和作為底部的圓盤狀部分15。軸承杯11經由滾針9裝在軸桿部分4之外周邊表面。滾針9以作為外滾道之軸承杯11的內周邊表面(圓柱形部分14)及作為內滾道之軸桿部分4的外周邊表面而滾動。這允許軸承杯11繞著軸桿部分4之軸線Z擺動。類似地，與上述軸承杯11相鄰的軸承杯11可繞著軸線X擺動。 Each rolling bearing portion 5 includes the above-mentioned shaft portion 4, a plurality of needle rollers 9, and a bearing cup 11. The needle rollers 9 are arranged along the outer peripheral surface of each shaft portion 4 so as to be able to roll thereon. The bearing cup 11 has a bottomed cylindrical shape. That is, the bearing cup 11 has a cylindrical portion 14 and a disc-shaped portion 15 as a bottom. The bearing cup 11 is mounted on the outer peripheral surface of the shaft portion 4 via the needle rollers 9. The needle rollers 9 roll with the inner peripheral surface (cylindrical portion 14) of the bearing cup 11 as an outer roller and the outer peripheral surface of the shaft portion 4 as an inner roller. This allows the bearing cup 11 to swing about the axis Z of the shaft portion 4. Similarly, the bearing cup 11 adjacent to the above-mentioned bearing cup 11 can swing about the axis X.

如圖1中所示，在軸桿部分4之遠側端表面與軸承杯11的底部表面之間設有墊圈10。於更靠近基底3的位置中相對於滾針9在軸線Z方向中設有滾子導件8、密封構件7、和擋油圈6。密封構件7、擋油圈(第二構件)6、和軸承杯(第一構件)11構成根據本揭示內容之密封構造1。擋油圈6和軸承杯11同心地配置且相對彼此旋轉。 As shown in FIG. 1 , a washer 10 is provided between the distal end surface of the shaft portion 4 and the bottom surface of the bearing cup 11. A roller guide 8, a sealing member 7, and an oil baffle 6 are provided in the axial Z direction relative to the needle roller 9 in a position closer to the base 3. The sealing member 7, the oil baffle (second member) 6, and the bearing cup (first member) 11 constitute a sealing structure 1 according to the present disclosure. The oil baffle 6 and the bearing cup 11 are concentrically arranged and rotate relative to each other.

密封構造1 Sealing structure 1

圖3係密封構造1的剖視圖。圖4係顯示處於自然狀態中之密封構件7、亦即處於密封構件7不與擋油圈6接觸的狀態中之密封構件7的剖視圖。在軸桿部分4與軸 承杯11的圓柱形部分14之間設有潤滑空間。滾針9配置於潤滑空間中，並以用作潤滑劑的油脂供給潤滑空間。提供密封構造1用於抑制水等進入潤滑空間，並抑制潤滑劑從潤滑空間洩漏至外側。在本揭示內容中，圖3中之下側界定為“第一軸向”，且圖3中的上側界定為“第二軸向”。圖3中之右側界定為“第一徑向”，且圖3中的左側界定為“第二徑向”。這些方向未指示軸向中之絕對特定方向，而指示相對方向。因此，“第一”和“第二”等詞可彼此替換。“第一徑向”和“第二徑向”亦相同。 FIG. 3 is a cross-sectional view of the sealing structure 1. FIG. 4 is a cross-sectional view showing the sealing member 7 in a natural state, that is, in a state where the sealing member 7 is not in contact with the oil baffle 6. A lubricating space is provided between the shaft portion 4 and the cylindrical portion 14 of the bearing cup 11. The needle roller 9 is arranged in the lubricating space, and the lubricating space is supplied with grease used as a lubricant. The sealing structure 1 is provided for inhibiting water and the like from entering the lubricating space, and inhibiting the lubricant from leaking out of the lubricating space to the outside. In the present disclosure, the lower side in FIG. 3 is defined as the "first axial direction", and the upper side in FIG. 3 is defined as the "second axial direction". The right side in FIG. 3 is defined as the "first radial direction", and the left side in FIG. 3 is defined as the "second radial direction". These directions do not indicate an absolute specific direction in the axis, but indicate relative directions. Therefore, the terms "first" and "second" can be used interchangeably. The "first radial direction" and "second radial direction" are also the same.

擋油圈6形成為環形，並在其基底端部裝配並附接至軸桿部分4的外周邊表面。擋油圈6具有坐落於軸承杯11之圓柱形部分14的徑向內側之圓柱形主要本體。主要本體稱為“擋油圈本體6a”。擋油圈本體6a沿著軸桿部分4的外周邊表面形成為圓柱形。擋油環6具有密封表面41、42、43，密封構件7之唇部31、32、33分別與密封表面41、42、43接觸。除了擋油圈本體6a以外，擋油圈6具有第一延伸部分6b和第二延伸部分6c。第一延伸部分6b在第一軸向側(圖3中的下側)上從擋油圈本體6a徑向往外延伸。第二延伸部分6c從第一延伸部分6b之徑向外端延伸於第二軸向方向中(圖3中的上側)。擋油圈本體6a、第一延伸部分6b、和第二延伸部分6c一體地形成為單一構件。 The oil baffle 6 is formed in a ring shape and is fitted and attached to the outer peripheral surface of the shaft portion 4 at its base end. The oil baffle 6 has a cylindrical main body located radially inward of the cylindrical portion 14 of the bearing cup 11. The main body is referred to as an "oil baffle body 6a". The oil baffle body 6a is formed in a cylindrical shape along the outer peripheral surface of the shaft portion 4. The oil baffle 6 has sealing surfaces 41, 42, 43, and the lips 31, 32, 33 of the sealing member 7 are in contact with the sealing surfaces 41, 42, 43, respectively. In addition to the oil baffle body 6a, the oil baffle 6 has a first extension portion 6b and a second extension portion 6c. The first extension portion 6b extends radially outward from the oil baffle body 6a on the first axial side (the lower side in FIG. 3). The second extension portion 6c extends from the radial outer end of the first extension portion 6b in the second axial direction (the upper side in FIG. 3). The oil baffle body 6a, the first extension portion 6b, and the second extension portion 6c are integrally formed as a single component.

在擋油圈本體6a之外周邊表面上，從第二軸向側至第一軸向側依次設有第二密封表面42和第三密封表面43。第二延伸部分6c具有圓柱形狀，且於其內周邊表面 上具有第一密封表面41。亦即，第二延伸部分6c設有徑向面朝內的第一密封表面41。第一密封表面41具有沿著軸向方向延伸之圓柱形狀。亦即，在本發明中，沿著第一密封表面41的中心線之方向與軸向方向彼此一致。 On the outer peripheral surface of the oil baffle body 6a, a second sealing surface 42 and a third sealing surface 43 are provided in sequence from the second axial side to the first axial side. The second extension portion 6c has a cylindrical shape and has a first sealing surface 41 on its inner peripheral surface. That is, the second extension portion 6c is provided with a first sealing surface 41 with a radial surface facing inward. The first sealing surface 41 has a cylindrical shape extending along the axial direction. That is, in the present invention, the direction along the center line of the first sealing surface 41 is consistent with the axial direction.

擋油圈6具有從第二延伸部分6c進一步徑向往外延伸的第三延伸部分6d。第二延伸部分6c之外周邊表面和第三延伸部分6d在第二軸向側上的表面面向軸承杯11之圓柱形部分14的端部，且於它們之間具有間隙。此間隙用作密封間隙，用以防止水等進入擋油圈6和軸承杯11的圓柱形部分14之間。 The oil baffle 6 has a third extension portion 6d extending radially outward from the second extension portion 6c. The outer peripheral surface of the second extension portion 6c and the surface of the third extension portion 6d on the second axial side face the end of the cylindrical portion 14 of the bearing cup 11, and there is a gap between them. This gap is used as a sealing gap to prevent water and the like from entering between the oil baffle 6 and the cylindrical portion 14 of the bearing cup 11.

密封構件7具有大致上環形的形狀且附接至軸承杯11之圓柱形部分14。密封構件7密封軸承杯11和擋油圈6之間的空間，並以油脂(潤滑劑)供給所述空間。為達成密封功能，密封構件7具有固定部分、橡膠唇部31、32、33、環帶彈簧(第一壓按構件)51、和支撐部分45。固定部分由金屬構件34所構成。 The sealing member 7 has a generally annular shape and is attached to the cylindrical portion 14 of the bearing cup 11. The sealing member 7 seals the space between the bearing cup 11 and the oil baffle 6 and supplies the space with grease (lubricant). To achieve the sealing function, the sealing member 7 has a fixed portion, rubber lips 31, 32, 33, an annular spring (first pressing member) 51, and a supporting portion 45. The fixed portion is composed of a metal member 34.

金屬構件(固定部分)34裝配至軸承杯11之圓柱形部分14的內周邊表面，以便固定至軸承杯11之圓柱形部分14。金屬構件34具有第一金屬構件34a和第二金屬構件34b。第一金屬構件34a具有第一圓柱形部分34a1和第一環形部分34a2。第一環形部分34a2從第一圓柱形部分34a1在第二軸向側上的端部徑向往內延伸。第二金屬構件34b具有第二圓柱形部分34b1和第二環形部分34b2。第二環形部分34b2從第二圓柱形部分34b1於第二軸向側上之端部徑 向往內延伸。第一圓柱形部分34a1裝配至軸承杯11的圓柱形部分14之內周邊表面，以固定至軸承杯11的圓柱形部分14。第二圓柱形部分34b1重疊在第一圓柱形部分34a1的徑向內側上，且壓接於第一圓柱形部分34a1之第一軸向側的端部上，以致第二金屬構件34b固定至第一金屬構件34a。 The metal member (fixing portion) 34 is fitted to the inner peripheral surface of the cylindrical portion 14 of the bearing cup 11 so as to be fixed to the cylindrical portion 14 of the bearing cup 11. The metal member 34 has a first metal member 34a and a second metal member 34b. The first metal member 34a has a first cylindrical portion 34a1 and a first annular portion 34a2. The first annular portion 34a2 extends radially inward from the end of the first cylindrical portion 34a1 on the second axial side. The second metal member 34b has a second cylindrical portion 34b1 and a second annular portion 34b2. The second annular portion 34b2 extends radially inward from the end of the second cylindrical portion 34b1 on the second axial side. The first cylindrical portion 34a1 is fitted to the inner peripheral surface of the cylindrical portion 14 of the bearing cup 11 to be fixed to the cylindrical portion 14 of the bearing cup 11. The second cylindrical portion 34b1 overlaps the radial inner side of the first cylindrical portion 34a1 and is pressed onto the end of the first axial side of the first cylindrical portion 34a1, so that the second metal member 34b is fixed to the first metal member 34a.

唇部31、32、33包括接合至金屬構件34的第一唇部31、第二唇部32、和第三唇部33。第一唇部31和第三唇部33固定至第二金屬構件34b之第二環形部分34b2，且第二唇部32固定至第一金屬構件34a的第一環形部分34a2。 The lips 31, 32, 33 include a first lip 31, a second lip 32, and a third lip 33 joined to the metal member 34. The first lip 31 and the third lip 33 are fixed to the second annular portion 34b2 of the second metal member 34b, and the second lip 32 is fixed to the first annular portion 34a2 of the first metal member 34a.

第一唇部31 First lip 31

第一唇部31具有基底部分(第一部分)31a、連接部分(第二部分)31b、和接觸部分(第三部分)31c。基底部分31a具有實質上圓柱形狀，且從金屬構件(固定部分)34在第一軸向方向中延伸。更具體地，基底部分31a從第二環形部分34b2於第一軸向側上之側表面在第一軸向方向中延伸。連接部分31b具有實質上環狀的形狀，且從基底部分31a之延伸端(基底部分31a於第一軸向側上的端部)徑向往外延伸。連接部分31b連接基底部分31a在第一軸向側上之端部與接觸部分31c於第一軸向側上的端部。接觸部分31c具有實質上圓柱形狀，且從連接部分31b之延伸端(連接部分31b的徑向外端)在第二軸向方向中延伸。接觸部分31c於基底部分31a之徑向往外地設有在其間的間隙，並與 擋油圈6之第一密封表面41接觸。 The first lip 31 has a base portion (first portion) 31a, a connecting portion (second portion) 31b, and a contact portion (third portion) 31c. The base portion 31a has a substantially cylindrical shape and extends from the metal member (fixing portion) 34 in the first axial direction. More specifically, the base portion 31a extends in the first axial direction from the side surface of the second annular portion 34b2 on the first axial side. The connecting portion 31b has a substantially annular shape and extends radially outward from the extended end of the base portion 31a (the end of the base portion 31a on the first axial side). The connecting portion 31b connects the end of the base portion 31a on the first axial side and the end of the contact portion 31c on the first axial side. The contact portion 31c has a substantially cylindrical shape and extends in the second axial direction from the extension end of the connecting portion 31b (the radial outer end of the connecting portion 31b). The contact portion 31c is provided with a gap radially outwardly from the base portion 31a and contacts the first sealing surface 41 of the oil retaining ring 6.

接觸部分31c於徑向外側(接觸部分31c的外周邊表面)之側表面界定為面向第一密封表面41的面向表面31c2，且面向表面31c2之至少一部分接觸第一密封表面41。相對於第一密封表面41，基底部分31a設置在接觸部分31c的與第一密封表面41相反之側面上。 The side surface of the contact portion 31c on the radially outer side (the outer peripheral surface of the contact portion 31c) is defined as a facing surface 31c2 facing the first sealing surface 41, and at least a portion of the facing surface 31c2 contacts the first sealing surface 41. Relative to the first sealing surface 41, the base portion 31a is disposed on the side of the contact portion 31c opposite to the first sealing surface 41.

環帶彈簧(第一壓按構件)51設於基底部分31a與接觸部分31c之間。更具體地，將環帶彈簧51容納在藉由基底部分31a、連接部分31b、和接觸部分31c所圍繞的空間(容納空間)S中。於基底部分31a與接觸部分31c之間設有用於將環帶彈簧51***容納空間S的開口A。開口A係在第二軸向方向中打開。環帶彈簧51係形成為環狀之螺旋彈簧。環帶彈簧51於收縮方向中彈性變形，以便容納在容納空間S中，且藉由在延伸方向中彈性地返回，將接觸部分31c壓向第一密封表面41。 The band spring (first pressing member) 51 is provided between the base portion 31a and the contact portion 31c. More specifically, the band spring 51 is accommodated in a space (accommodation space) S surrounded by the base portion 31a, the connecting portion 31b, and the contact portion 31c. An opening A for inserting the band spring 51 into the accommodation space S is provided between the base portion 31a and the contact portion 31c. The opening A is opened in the second axial direction. The band spring 51 is a coil spring formed in a ring shape. The annular spring 51 elastically deforms in the contraction direction so as to be accommodated in the accommodation space S, and presses the contact portion 31c toward the first sealing surface 41 by elastically returning in the extension direction.

支撐部分45和金屬構件34 Supporting portion 45 and metal member 34

於此，如上所述，本揭示內容的金屬構件34由第一金屬構件34a和第二金屬構件34b所構成。第一金屬構件34a之第一圓柱形部分34a1和第二金屬構件34b的第二圓柱形部分34b1構成金屬構件34之圓柱形部分35。第二環形部分34b2從第二圓柱形部分34b1在第一軸向側上的端部徑向往內延伸，其係圓柱形部分35之一部分。從上面，金屬構件34包括附接至軸承杯11的圓柱形部分14之圓柱形部 分35、和從圓柱形部分35的一部分(第二圓柱形部分34b1)徑向朝內延伸之第二環形部分34b2。金屬構件34用作將密封構件7固定至軸承杯11的芯部材料。 Here, as described above, the metal member 34 of the present disclosure is composed of a first metal member 34a and a second metal member 34b. The first cylindrical portion 34a1 of the first metal member 34a and the second cylindrical portion 34b1 of the second metal member 34b constitute the cylindrical portion 35 of the metal member 34. The second annular portion 34b2 extends radially inward from the end of the second cylindrical portion 34b1 on the first axial side, which is a part of the cylindrical portion 35. From above, the metal member 34 includes a cylindrical portion 35 attached to the cylindrical portion 14 of the bearing cup 11, and a second annular portion 34b2 extending radially inward from a part of the cylindrical portion 35 (the second cylindrical portion 34b1). The metal member 34 is used as a core material for fixing the sealing member 7 to the bearing cup 11.

支撐部分45用作密封構件7之第一唇部31的芯部材料。亦即，支撐部分45沿著第一唇部31之基底部分31a提供，且抑制基底部分31a徑向往外變形。本揭示內容的支撐部分45由與金屬構件34分開之金屬構件所構成。為用作芯部材料，支撐部分45僅需要由具有比第一唇部31(基底部分31a)更高的剛性之材料所製成，所述唇部31由橡膠所製成。 The support portion 45 is used as the core material of the first lip 31 of the sealing member 7. That is, the support portion 45 is provided along the base portion 31a of the first lip 31, and suppresses the base portion 31a from deforming radially outward. The support portion 45 of the present disclosure is composed of a metal member separated from the metal member 34. To be used as a core material, the support portion 45 only needs to be made of a material having higher rigidity than the first lip 31 (base portion 31a), which is made of rubber.

支撐部分45具有支撐本體部分46和輔助部分47。支撐本體部分46係沿著基底部分31a在軸向方向中延伸的圓柱形部分。支撐本體部分46實質上沿著整個基底部分31a提供。更具體地，支撐本體部分46從第二環形部分34b2於第一軸向方向中延伸，且支撐本體部分46在第一軸向側上之端部坐落於環帶彈簧51的徑向內側。 The support portion 45 has a support body portion 46 and an auxiliary portion 47. The support body portion 46 is a cylindrical portion extending in the axial direction along the base portion 31a. The support body portion 46 is substantially provided along the entire base portion 31a. More specifically, the support body portion 46 extends from the second annular portion 34b2 in the first axial direction, and the end of the support body portion 46 on the first axial side is located radially inward of the annular spring 51.

輔助部分47係使用於定位支撐部分45。因此，輔助部分47從圓柱形支撐本體部分46在第二軸向側上之端部46a徑向往內地延伸。亦即，輔助部分47具有環狀形狀。輔助部分47與支撐本體部分46為一體的，且輔助部分47之表面於軸向方向中接觸金屬構件34的一部分。支撐部分45具有大致上環狀形狀，且在包括密封構造1之中心線的剖面中具有L形。 The auxiliary portion 47 is used to position the support portion 45. Therefore, the auxiliary portion 47 extends radially inward from the end 46a of the cylindrical support body portion 46 on the second axial side. That is, the auxiliary portion 47 has an annular shape. The auxiliary portion 47 is integral with the support body portion 46, and the surface of the auxiliary portion 47 contacts a portion of the metal member 34 in the axial direction. The support portion 45 has a substantially annular shape and has an L-shape in a cross section including the center line of the sealing structure 1.

輔助部分47之徑向內端47a比金屬構件34的 第二環形部分34b2之徑向內端48a更徑向往內地突出。此組構提供用於當藉由模具形成密封構件7時精確地定位支撐部分45。稍後將敘述此藉由模具的模製。 The radial inner end 47a of the auxiliary portion 47 protrudes radially inwardly more than the radial inner end 48a of the second annular portion 34b2 of the metal member 34. This structure is provided for accurately positioning the support portion 45 when the sealing member 7 is formed by a mold. This molding by a mold will be described later.

第二唇部32和第三唇部33 Second lip 32 and third lip 33

第二唇部32從第一環形部分34a2在第一軸向方向中延伸。第二唇部32於側表面的徑向內側上接觸擋油環6的第二密封表面42。凹部32a提供在第二唇部32之徑向外側上的側表面上。環帶彈簧(第二壓按構件)52提供於凹部32a中。藉由將螺旋彈簧形成為圓環形狀來提供環帶彈簧52。環帶彈簧52在延伸方向中彈性變形，以便容納於凹部32a中，並藉由在收縮方向中彈性地返回，從而將第二唇部32壓向第二密封表面42。 The second lip 32 extends from the first annular portion 34a2 in the first axial direction. The second lip 32 contacts the second sealing surface 42 of the oil baffle ring 6 on the radially inner side of the side surface. The recess 32a is provided on the side surface on the radially outer side of the second lip 32. The annular spring (second pressing member) 52 is provided in the recess 32a. The annular spring 52 is provided by forming the coil spring into a circular ring shape. The annular spring 52 elastically deforms in the extension direction so as to be accommodated in the recess 32a, and by elastically returning in the contraction direction, the second lip 32 is pressed against the second sealing surface 42.

第三唇部33從第二環形部分34b2於徑向內側上之端部在第一軸向方向中延伸。第三唇部33於側表面的徑向內側上接觸擋油環6之第三密封表面43。第三密封表面43形成為其外徑從第一軸向側至第二軸向側逐漸減小的傾斜面(圓錐表面)。注意可省略第三唇部33。在本實施中，第三密封表面43形成為圓錐形狀。然而，譬如，第三密封表面43可為與軸向方向平行之圓柱形表面。 The third lip 33 extends in the first axial direction from the end of the second annular portion 34b2 on the radial inner side. The third lip 33 contacts the third sealing surface 43 of the oil retaining ring 6 on the radial inner side of the side surface. The third sealing surface 43 is formed as an inclined surface (conical surface) whose outer diameter gradually decreases from the first axial side to the second axial side. Note that the third lip 33 can be omitted. In the present embodiment, the third sealing surface 43 is formed into a cone shape. However, for example, the third sealing surface 43 may be a cylindrical surface parallel to the axial direction.

密封構造1和密封構件7 Sealing structure 1 and sealing member 7

如圖3中所示，於本實施例的密封構件7中，第一唇部31與以徑向面朝內之方式設置的第一密封表面41 接觸，且第二唇部32和第三唇部33與以徑向面朝外之方式設置的第二密封表面42和第三密封表面43接觸。因此，即使軸桿部分4相對於軸承杯11在軸向方向中運動，密封性能亦不會降低。 As shown in FIG. 3 , in the sealing member 7 of the present embodiment, the first lip 31 contacts the first sealing surface 41 disposed in a manner with the radial surface facing inward, and the second lip 32 and the third lip 33 contact the second sealing surface 42 and the third sealing surface 43 disposed in a manner with the radial surface facing outward. Therefore, even if the shaft portion 4 moves in the axial direction relative to the bearing cup 11, the sealing performance will not be reduced.

當軸桿部分4相對於軸承杯11在徑向方向(例如，至圖3中之右側)運動時，於軸桿部分4的第一徑向側(圖3中所示部分)上，第一唇部31在遠離第一密封表面41之方向中運動，但是第二唇部32和第三唇部33於接近第二和第三密封表面42、43的方向中運動。在與軸桿部分4之第一徑向側相反的軸桿部分4之第二徑向側上，第二和第三唇部32、33於遠離第二和第三密封表面42、43的方向中運動，但是第一唇部31在接近第一密封表面41之方向中運動。因此，其係可能於徑向方向中確保在密封構件7的兩側上之密封性能。 When the shaft portion 4 moves in a radial direction (for example, to the right side in FIG. 3 ) relative to the bearing cup 11, on the first radial side (the portion shown in FIG. 3 ) of the shaft portion 4, the first lip 31 moves in a direction away from the first sealing surface 41, but the second lip 32 and the third lip 33 move in a direction approaching the second and third sealing surfaces 42, 43. On the second radial side of the shaft portion 4 opposite to the first radial side of the shaft portion 4, the second and third lips 32, 33 move in a direction away from the second and third sealing surfaces 42, 43, but the first lip 31 moves in a direction approaching the first sealing surface 41. Therefore, it is possible to ensure the sealing performance on both sides of the sealing member 7 in the radial direction.

於擋油圈6中，第二和第三密封表面42、43設在擋油圈本體6a的外周邊表面上，且坐落於第二和第三密封表面42、43之徑向外側的第一密封表面41設在第二延伸部分6c之內周邊表面上。因此，設置第二密封表面42和第三密封表面43、及第一密封表面41，以便於徑向方向中實質上面朝彼此，而在其間具有一空間。所述空間用作用於配置密封構件7(唇部31、33)的空間。使密封構件7設在所述空間中，唇部31至33接觸第一密封表面41及於徑向方向中面向彼此設置的第二和第三密封表面42、43。由於第三密封表面43設在第一密封表面41之徑向內側，因此能夠 最大程度地減小密封構造1的軸向尺寸。 In the oil baffle 6, the second and third sealing surfaces 42, 43 are arranged on the outer peripheral surface of the oil baffle body 6a, and the first sealing surface 41 located radially outward of the second and third sealing surfaces 42, 43 is arranged on the inner peripheral surface of the second extension portion 6c. Therefore, the second sealing surface 42 and the third sealing surface 43, and the first sealing surface 41 are arranged so as to substantially face each other in the radial direction, and there is a space therebetween. The space is used as a space for configuring the sealing member 7 (lips 31, 33). The sealing member 7 is arranged in the space, and the lips 31 to 33 contact the first sealing surface 41 and the second and third sealing surfaces 42, 43 arranged facing each other in the radial direction. Since the third sealing surface 43 is arranged radially inward of the first sealing surface 41, the axial dimension of the sealing structure 1 can be minimized to the greatest extent.

如上所述，本揭示內容之密封構造1密封要用油脂潤滑的滾動軸承部分5之內部空間(潤滑空間)。於下文中，如圖3中所示，相對於沿著第一密封表面41的方向(軸向方向)，亦將滾動軸承部分5相對於第一唇部31之內側稱為“潤滑空間側”，且亦將滾動軸承部分5相對於第一唇部31的外側稱為“潤滑空間外側”。 As described above, the sealing structure 1 of the present disclosure seals the inner space (lubricating space) of the rolling bearing portion 5 to be lubricated with grease. Hereinafter, as shown in FIG. 3 , the inner side of the rolling bearing portion 5 relative to the first lip 31 relative to the direction along the first sealing surface 41 (axial direction) is also referred to as the "lubricating space side", and the outer side of the rolling bearing portion 5 relative to the first lip 31 is also referred to as the "lubricating space outer side".

圖7A顯示在供給油脂之前的狀態中接觸第一密封表面41之第一唇部31的接觸部分31c。於此狀態中，接觸部分31c之面向表面31c2在第二軸向側(潤滑空間外側)的部分接觸第一密封表面41，及接觸部分31c在第一軸向側(潤滑空間側)上的一部分面向第一密封表面41，而於其間具有微小間隙s。 FIG. 7A shows the contact portion 31c of the first lip 31 contacting the first sealing surface 41 in a state before grease is supplied. In this state, a portion of the facing surface 31c2 of the contact portion 31c on the second axial side (outside the lubrication space) contacts the first sealing surface 41, and a portion of the contact portion 31c on the first axial side (lubrication space side) faces the first sealing surface 41 with a small gap s therebetween.

圖7B顯示在潤滑劑供給至潤滑空間之狀態中的第一唇部31。當將油脂供給至潤滑空間時，由橡膠所製成之第一唇部31藉由油脂的供給壓力(內部壓力)於著箭頭c之方向中壓按。因此，在接觸部分31c的面向表面31c2之以其間具有微小間隙s面向第一密封表面41的部分被驅策至接觸第一密封表面41。 FIG. 7B shows the first lip 31 in a state where lubricant is supplied to the lubrication space. When grease is supplied to the lubrication space, the first lip 31 made of rubber is pressed in the direction of arrow c by the grease supply pressure (internal pressure). Therefore, the portion of the facing surface 31c2 of the contact portion 31c facing the first sealing surface 41 with a small gap s therebetween is driven to contact the first sealing surface 41.

鑑於上述情況，在本揭示內容之密封構造1中，沿著第一唇部31的基底部分31a設置了高剛性支撐部分45。這使得其可能抑制第一唇部31由於供給至潤滑空間之油脂的壓力而強力地壓按密封表面41。在接觸部分31c之面向表面31c2的以其間具有微小間隙s面向第一密封表 面41的部分被限制，而免於藉由其表面接觸第一密封表面41。因此，油脂以供給壓力向上推接觸部分31c，並從接觸部分31c與第一密封表面41之間的間隙排出(參照箭頭d)。以此方式，可在潤滑空間中用新油脂適當地替換舊油脂。 In view of the above, in the sealing structure 1 of the present disclosure, a high-rigidity support portion 45 is provided along the base portion 31a of the first lip 31. This makes it possible to suppress the first lip 31 from strongly pressing the sealing surface 41 due to the pressure of the grease supplied to the lubrication space. The portion of the facing surface 31c2 of the contact portion 31c facing the first sealing surface 41 with a small gap s therebetween is restricted from contacting the first sealing surface 41 through its surface. Therefore, the grease pushes the contact portion 31c upward with the supply pressure and is discharged from the gap between the contact portion 31c and the first sealing surface 41 (refer to arrow d). In this way, old grease can be appropriately replaced with new grease in the lubrication space.

如上所述，在維護等時，用新的油脂代替潤滑空間中之油脂。本揭示內容的密封構造1提供一組構，其中油脂易於從接觸部分31c與第一密封表面41之間的間隙排出。在本揭示內容之密封構造1中，除了如上所述的支撐部分45之功能以外，於第一唇部31的接觸部分31c中提供溝槽61，以致可進一步改善油脂排出性能。在下文中，將對其進行敘述。 As described above, during maintenance, etc., the grease in the lubrication space is replaced with new grease. The sealing structure 1 of the present disclosure provides a structure in which grease is easily discharged from the gap between the contact portion 31c and the first sealing surface 41. In the sealing structure 1 of the present disclosure, in addition to the function of the support portion 45 as described above, a groove 61 is provided in the contact portion 31c of the first lip 31, so that the grease discharge performance can be further improved. Hereinafter, it will be described.

第一唇部31之溝槽61的功能 Function of the groove 61 of the first lip 31

如圖5所示，第一唇部31之接觸部分31c具有面向第一密封表面41的側表面(以下，亦稱為“面向表面”)31c2。溝槽61提供於面向表面31c2中。溝槽61從接觸部分31c在潤滑空間側上之端部於軸向方向中延伸朝潤滑空間外側。如圖6A和6B中所示，在第一唇部31之圓周方向中的一定間隔的多數位置處提供溝槽61。例如，在第一唇部31之圓周方向中的等間隔16個位置處形成溝槽61。本實施例之每一溝槽61的底部表面之截面(在垂直於軸線的方向中之剖面)具有實質上弧形的形狀。 As shown in FIG. 5 , the contact portion 31c of the first lip 31 has a side surface (hereinafter, also referred to as a "facing surface") 31c2 facing the first sealing surface 41. A groove 61 is provided in the facing surface 31c2. The groove 61 extends in the axial direction from the end of the contact portion 31c on the lubricating space side toward the outside of the lubricating space. As shown in FIGS. 6A and 6B , the grooves 61 are provided at a plurality of positions at certain intervals in the circumferential direction of the first lip 31. For example, the grooves 61 are formed at 16 positions at equal intervals in the circumferential direction of the first lip 31. The cross section (cross section in a direction perpendicular to the axis) of the bottom surface of each groove 61 of the present embodiment has a substantially arcuate shape.

每一溝槽61包括在潤滑空間側上之深溝槽部 分61a和於潤滑空間外側上的淺溝槽部分61b。深溝槽部分61a和淺溝槽部分61b之底部表面係相對於第一密封表面41傾斜，致使其軸向深度在潤滑空間側更深。深溝槽部分61a的底部表面之傾斜度比淺溝槽部分61b的底部表面之傾斜度更大。如圖6A和6B中所示，深溝槽部分61a和淺溝槽部分61b的周向寬度W3係實質上相同。如上所述，溝槽61於潤滑空間側上具有較大之截面積，且在潤滑空間外側上具有較小的截面積。 Each groove 61 includes a deep groove portion 61a on the lubricating space side and a shallow groove portion 61b on the outer side of the lubricating space. The bottom surfaces of the deep groove portion 61a and the shallow groove portion 61b are inclined relative to the first sealing surface 41, so that the axial depth thereof is deeper on the lubricating space side. The inclination of the bottom surface of the deep groove portion 61a is greater than the inclination of the bottom surface of the shallow groove portion 61b. As shown in FIGS. 6A and 6B, the circumferential width W3 of the deep groove portion 61a and the shallow groove portion 61b is substantially the same. As described above, the groove 61 has a larger cross-sectional area on the lubricating space side and a smaller cross-sectional area on the outside of the lubricating space.

如上所述，圖7A顯示第一唇部31之接觸第一密封表面41的接觸部分31c。於此狀態中，接觸部分31c在第二軸向側(潤滑空間外側)上之面向表面31c2的一部分接觸第一密封表面41，且接觸部分31c於第一軸向側(潤滑空間側)上之面向表面31c2的一部分面向第一密封表面41，而在其間具有微小的間隙s。 As described above, FIG. 7A shows the contact portion 31c of the first lip 31 contacting the first sealing surface 41. In this state, a portion of the facing surface 31c2 of the contact portion 31c on the second axial side (outside the lubrication space) contacts the first sealing surface 41, and a portion of the facing surface 31c2 of the contact portion 31c on the first axial side (lubrication space side) faces the first sealing surface 41, with a small gap s therebetween.

如上所述，圖7B顯示於油脂供給至潤滑空間之狀態中的第一唇部31。當油脂供給至潤滑空間時，第一唇部31藉由油脂之供給壓力(內部壓力)在箭頭c的方向中壓按。此時，支撐部分45抑制第一唇部31之變形。然而，於此假設在接觸部分31c的面向表面31c2，面向第一密封表面41而於其間具有微小間隙s之部分接觸第一密封表面41。 As described above, FIG. 7B shows the first lip 31 in a state where grease is supplied to the lubrication space. When grease is supplied to the lubrication space, the first lip 31 is pressed in the direction of arrow c by the supply pressure (internal pressure) of the grease. At this time, the support portion 45 suppresses deformation of the first lip 31. However, it is assumed here that the facing surface 31c2 of the contact portion 31c, which faces the first sealing surface 41 and has a small gap s therebetween, contacts the first sealing surface 41.

在此時，如圖6B中所示，更遠地坐落於位置L的第二軸向方向中之接觸部分31c的面向表面31c2之區域對應於完全接觸區域R1。溝槽61在第二軸向側(潤滑空間 外側)上的端部配置於位置L。在完全接觸區域R1中，接觸部分31c之面向表面31c2的整個周緣(整個表面)接觸第一密封表面41。再者，接觸部分31c於位置L之第一軸向側上的面向表面31c2之區域係部分接觸區域R2，其中接觸部分31c的面向表面31c2由於溝槽61而在圓周方向中不連續地(間歇地)接觸第一密封表面41。也就是說，接觸部分31c之面向表面31c2具有完全接觸區域R1和部分接觸區域R2。 At this time, as shown in FIG. 6B , the area of the facing surface 31c2 of the contact portion 31c located further in the second axial direction of the position L corresponds to the full contact area R1. The end of the groove 61 on the second axial side (outer side of the lubrication space) is arranged at the position L. In the full contact area R1, the entire circumference (entire surface) of the facing surface 31c2 of the contact portion 31c contacts the first sealing surface 41. Furthermore, the area of the facing surface 31c2 of the contact portion 31c on the first axial side of the position L is a partial contact area R2, in which the facing surface 31c2 of the contact portion 31c contacts the first sealing surface 41 discontinuously (intermittently) in the circumferential direction due to the groove 61. That is, the facing surface 31c2 of the contact portion 31c has a complete contact area R1 and a partial contact area R2.

因此，如圖7B中所示，甚至當藉由油脂於箭頭c的方向中壓按第一唇部31時，部分接觸區域R2之溝槽61的表面亦不接觸第一密封表面41。因此，潤滑空間中之油脂進入溝槽61，藉由其供給壓力向上推動接觸部分31c，並從接觸部分31c的完全接觸區域R1與第一密封表面41之間的間隙排出(參考箭頭d)。這樣一來，可在潤滑空間中用新油脂適當地替換舊油脂。 Therefore, as shown in FIG. 7B , even when the first lip 31 is pressed in the direction of arrow c by grease, the surface of the groove 61 of the partial contact area R2 does not contact the first sealing surface 41. Therefore, the grease in the lubrication space enters the groove 61, pushes the contact portion 31c upward by its supply pressure, and is discharged from the gap between the full contact area R1 of the contact portion 31c and the first sealing surface 41 (refer to arrow d). In this way, the old grease can be properly replaced with new grease in the lubrication space.

如上所述，由於溝槽61在潤滑空間側上之截面積大於在潤滑空間外側的截面積，因此油脂容易流入溝槽61，並改善在油脂供給時之油脂排出性能。 As described above, since the cross-sectional area of the groove 61 on the lubrication space side is larger than the cross-sectional area on the outside of the lubrication space, grease can easily flow into the groove 61, and the grease discharge performance during grease supply is improved.

如圖7B中所示，於接觸部分31c的面向表面31c2中，完全接觸區域R1和部分接觸區域R2之間的邊界L坐落在第一軸向側(潤滑空間側)上之環帶彈簧51的端部51b與環帶彈簧51的中心51a之間的軸向範圍D中。出於以下原因提供此組構。亦即，如果邊界L相對於端部51b坐落在第一軸向側上，則油脂難以進入溝槽61以上推面向表面31c2之完全接觸區域R1。如果邊界L相對於中心51a設置於 第二軸向側(潤滑空間外側)上，則由於完全接觸區域R1的表面壓力，接觸部分31c之密封性能降低。 As shown in FIG. 7B , in the facing surface 31c2 of the contact portion 31c, the boundary L between the full contact area R1 and the partial contact area R2 is located in the axial range D between the end 51b of the endless spring 51 on the first axial side (lubricating space side) and the center 51a of the endless spring 51. This structure is provided for the following reason. That is, if the boundary L is located on the first axial side relative to the end 51b, it is difficult for grease to enter the groove 61 to push the full contact area R1 of the facing surface 31c2. If the boundary L is set on the second axial side (outside the lubrication space) relative to the center 51a, the sealing performance of the contact portion 31c is reduced due to the surface pressure of the complete contact area R1.

圖8A和8B顯示當油脂的供給壓力作用在第一唇部31上時，第一密封表面41上之完全接觸區域R1的表面壓力改變。如圖8A中所示，當完全接觸區域R1和部分接觸區域R2之間的邊界L與環帶彈簧51之中心51a重合時，第一密封表面41上的完全接觸區域R1之表面壓力指示於潤滑空間側上的端部之峰值(參見P1點)。因此，水等容易從面向表面31c2與潤滑空間外側上的第一密封表面41之間的間隙進入。 Figures 8A and 8B show that the surface pressure of the full contact area R1 on the first sealing surface 41 changes when the grease supply pressure acts on the first lip 31. As shown in Figure 8A, when the boundary L between the full contact area R1 and the partial contact area R2 coincides with the center 51a of the annular spring 51, the surface pressure of the full contact area R1 on the first sealing surface 41 indicates the peak value of the end on the lubricating space side (see point P1). Therefore, water and the like easily enter from the gap between the facing surface 31c2 and the first sealing surface 41 on the outer side of the lubricating space.

如圖8B中所示，當完全接觸區域R1和部分接觸區域R2之間的邊界L相對於環帶彈簧51之中心51a坐落更靠近潤滑空間側時，完全接觸區域R1在第一密封表面41上的表面壓力指示於潤滑空間外側上之端部的峰值(參見P2點)。因此，可適當地抑制水等從潤滑空間外側的面向表面31c2與第一密封表面41之間的間隙進入，並可適當地維持密封性能。 As shown in FIG. 8B , when the boundary L between the full contact area R1 and the partial contact area R2 is located closer to the lubricating space side relative to the center 51a of the annular spring 51, the surface pressure of the full contact area R1 on the first sealing surface 41 indicates the peak value of the end on the outside of the lubricating space (see point P2). Therefore, water or the like can be properly suppressed from entering the gap between the facing surface 31c2 on the outside of the lubricating space and the first sealing surface 41, and the sealing performance can be properly maintained.

圖9A和9B係對應於圖6A和6B之概要圖，並顯示第一唇部31的溝槽61之修改。在所述修改的溝槽61中，深溝槽部分61a於圓周方向中之寬度W4大於淺溝槽部分61b的寬度W3。深溝槽部分61a之截面形狀具有實質上圓弧形狀。根據所述修改，可使深溝槽部分61a的截面形狀製成較大，其能夠使油脂容易流入溝槽61。 9A and 9B are schematic diagrams corresponding to FIGS. 6A and 6B and show the modification of the groove 61 of the first lip 31. In the modified groove 61, the width W4 of the deep groove portion 61a in the circumferential direction is greater than the width W3 of the shallow groove portion 61b. The cross-sectional shape of the deep groove portion 61a has a substantially circular arc shape. According to the modification, the cross-sectional shape of the deep groove portion 61a can be made larger, which enables grease to flow into the groove 61 easily.

用模具模製密封件7 Molding seals with molds7

密封構件7(參考圖4)包括橡膠唇部31、32、33、用於固定唇部31、32、33之金屬構件(固定部分)34、和用作第一唇部31的芯部材料之支撐部分45。具有此組構的密封構件7藉由模具所形成。更具體地，在將第一金屬構件34a固定至模具之一部分的狀態中，於模具中硫化並模製第二唇部32，且整合第一金屬構件34a和第二唇部32。再者，於第二金屬構件34b固定至另一模具之一部分的狀態中，在模具中硫化並模製第一唇部31和第三唇部33，並整合第二金屬構件34b、第一唇部31、和第三唇部33。當硫化和模製第一唇部31時，支撐部分45固定至模具上。 The sealing member 7 (refer to FIG. 4 ) includes rubber lips 31, 32, 33, a metal member (fixing portion) 34 for fixing the lips 31, 32, 33, and a supporting portion 45 used as a core material of the first lip 31. The sealing member 7 having this structure is formed by a mold. More specifically, in a state where the first metal member 34a is fixed to a part of the mold, the second lip 32 is vulcanized and molded in the mold, and the first metal member 34a and the second lip 32 are integrated. Furthermore, in a state where the second metal member 34b is fixed to another part of the mold, the first lip 31 and the third lip 33 are vulcanized and molded in the mold, and the second metal member 34b, the first lip 31, and the third lip 33 are integrated. When the first lip 31 is vulcanized and molded, the supporting portion 45 is fixed to the mold.

圖10係顯示將支撐部分45固定至模具之狀態的說明圖。如圖10中所示，模具之一部分65接觸支撐部分45的輔助部分47之徑向內端47a。當支撐部分45嵌入第一唇部31時，支撐部分45定位於徑向方向中。注意模具的部分65在圓周方向中部分地接觸輔助部分47之徑向內端47a。因此，於部分65以外的部分中形成橡膠部分。 FIG. 10 is an explanatory diagram showing a state where the support portion 45 is fixed to the mold. As shown in FIG. 10 , a portion 65 of the mold contacts the radial inner end 47a of the auxiliary portion 47 of the support portion 45. When the support portion 45 is embedded in the first lip 31, the support portion 45 is positioned in the radial direction. Note that the portion 65 of the mold partially contacts the radial inner end 47a of the auxiliary portion 47 in the circumferential direction. Therefore, a rubber portion is formed in a portion other than the portion 65.

當使用模具以一體地形成包括橡膠唇部31、33、支撐部分45、和第二金屬構件34b之密封構件7時，使輔助部分47的表面與第二金屬構件34b之一部分在軸向方向中接觸。這有利於支撐部分45和第二金屬構件34b定位在軸向方向中。再者，模具的另一部分66於第一軸向側上接觸輔助部分47之表面。這確保支撐部分45在軸向方向中 的定位。模具之另一部分66於圓周方向中部分地接觸輔助部分47的表面。因此，在部分66以外之部分中形成橡膠部分。 When the mold is used to integrally form the sealing member 7 including the rubber lips 31, 33, the support portion 45, and the second metal member 34b, the surface of the auxiliary portion 47 is brought into contact with a portion of the second metal member 34b in the axial direction. This facilitates the positioning of the support portion 45 and the second metal member 34b in the axial direction. Furthermore, another portion 66 of the mold contacts the surface of the auxiliary portion 47 on the first axial side. This ensures the positioning of the support portion 45 in the axial direction. Another portion 66 of the mold partially contacts the surface of the auxiliary portion 47 in the circumferential direction. Therefore, a rubber portion is formed in a portion other than portion 66.

其他 other

如上所述，支撐部分45於包括密封構造1的中心線之剖面中具有L形。金屬構件34實質上整體上為U字形，且藉由重疊第一金屬構件34a和第二金屬構件34b來建構。支撐部分45、第一金屬構件34a、和第二金屬構件34b的每一者在包括密封構造1之中心線的剖面中具有L形。如上所述，於本揭示內容中，支撐部分45與金屬構件34分開地提供。在金屬構件34中，第一金屬構件34a和第二金屬構件34b分開地提供。於本揭示內容中，第一金屬構件34a、第二金屬構件34b、和支撐部分45具有帶有彎曲部分之形狀。然而，第一金屬構件34a、第二金屬構件34b、和支撐部分45可分開地製造，這有利於其製造。 As described above, the support portion 45 has an L-shape in a cross section including the center line of the sealing structure 1. The metal member 34 is substantially U-shaped as a whole, and is constructed by overlapping the first metal member 34a and the second metal member 34b. Each of the support portion 45, the first metal member 34a, and the second metal member 34b has an L-shape in a cross section including the center line of the sealing structure 1. As described above, in the present disclosure, the support portion 45 is provided separately from the metal member 34. In the metal member 34, the first metal member 34a and the second metal member 34b are provided separately. In the present disclosure, the first metal member 34a, the second metal member 34b, and the support portion 45 have a shape with a curved portion. However, the first metal member 34a, the second metal member 34b, and the supporting portion 45 can be manufactured separately, which facilitates the manufacturing thereof.

本發明不限於以上實施例，並可在請求項中所敘述的本發明之範圍內進行修改。例如，支撐部分45可與金屬構件34(第二金屬構件34b)成為一體。譬如設於第一唇部31的接觸部分31c中之溝槽61的數量、軸向長度、周向寬度、及截面形狀等因素可適當地改變。本揭示內容之密封構造1可應用至除了十字接頭20中的軸桿部分4與軸承杯11之間的部分以外之部分。 The present invention is not limited to the above embodiments and can be modified within the scope of the present invention described in the claims. For example, the support portion 45 can be integrated with the metal member 34 (the second metal member 34b). For example, the number, axial length, circumferential width, and cross-sectional shape of the grooves 61 provided in the contact portion 31c of the first lip 31 can be appropriately changed. The sealing structure 1 of the present disclosure can be applied to a portion other than the portion between the shaft portion 4 and the bearing cup 11 in the cross joint 20.

1:密封構造 1: Sealing structure

4:軸桿部分 4: Shaft part

6:擋油圈 6: Oil retaining ring

6a:擋油圈本體 6a: Oil retaining ring body

6b:第一延伸部分 6b: First extension part

6c:第二延伸部分 6c: Second extension part

6d:第三延伸部分 6d: The third extension

7:密封構件 7: Sealing components

8:滾子導件 8: Roller guide

9:滾針 9: Rolling needle

11:軸承杯 11: Bearing cup

14:圓柱形部分 14: Cylindrical part

31:唇部 31: Lips

31a:基底部分 31a: Base part

31b:連接部分 31b: Connection part

31c:接觸部分 31c: Contact part

31c2:面向表面 31c2: Surface facing

32:唇部 32: Lips

32a:凹部 32a: Concave part

33:唇部 33: Lips

34:金屬構件 34:Metal components

34a:第一金屬構件 34a: First metal component

34a1:第一圓柱形部分 34a1: first cylindrical part

34a2:第一環形部分 34a2: First annular part

34b:第二金屬構件 34b: Second metal component

34b1:第二圓柱形部分 34b1: Second cylindrical part

34b2:第二環形部分 34b2: Second annular part

35:圓柱形部分 35: Cylindrical part

41:密封表面 41: Sealing surface

42:密封表面 42: Sealing surface

43:密封表面 43: Sealing surface

45:支撐部分 45: Support part

46:支撐本體部分 46: Support the main body

47:輔助部分 47: Auxiliary part

51:環帶彈簧 51: Ring spring

52:環帶彈簧 52: Ring spring

A:開口 A: Opening

S:容納空間 S: Accommodation space

Claims (4)

一種密封構造(1)，其特徵在於包含：第一構件(11)，具有圓柱形部分；第二構件(6)，具有主要本體(6a)，該主要本體(6a)坐落在該圓柱形部分的徑向內側，並與該第一構件(11)同心地設置，以便相對於該第一構件(11)旋轉；及環狀密封構件(7)，其附接至該第一構件(11)且建構成密封該第一構件(11)與該第二構件(6)之間的空間，以潤滑劑供給該空間，其中：該第二構件(6)更包括第一延伸部分(6b)和第二延伸部分(6c)，該第一延伸部分(6b)從該主要本體(6a)之一部分徑向往外地延伸在第一軸向側上，該第二延伸部分(6c)從該第一延伸部分(6b)的徑向外端延伸於第二軸向方向中，並設有徑向面朝內之密封表面(41)；及該環狀密封構件(7)包括：固定部分，固定至該第一構件(11)，橡膠唇部(31)，具有基底部分(31a)、接觸部分(31c)、及連接部分(31b)，該基底部分(31a)從該固定部分在第一軸向方向中延伸，該接觸部分(31c)於該基底部分(31a)的徑向往外處設有在該接觸部分(31c)與該基底部分(31a)之間的間隙，並建構成接觸該密封表面(41)，及該連接部分(31b)連接該第一軸向側上之基底部分(31a)的一部分和該第一軸向側上之接觸部分(31c)的一部分，壓按構件，設於該基底部分(31a)及該接觸部分 (31c)之間，以將該接觸部分(31c)壓按朝該密封表面(41)，及支撐部分(45)，沿著該基底部分(31a)設置，且具有比該基底部分(31a)更高的剛性，其中：該固定部分具有附接至該第一構件(11)之金屬構件(34)；該支撐部分(45)與該金屬構件(34)分開，該支撐部分(45)具有圓柱形支撐本體部分(46)和輔助部分(47)，該圓柱形支撐本體部分(46)在軸向方向中沿著該基底部分(31a)延伸，且該輔助部分(47)係與該圓柱形支撐本體部分(46)一體形成，並建構成於該軸向方向中接觸該金屬構件(34)之一部分，該輔助部分(47)從該圓柱形支撐本體部分(46)的端部(46a)在該第二軸向中徑向朝內延伸，和該潤滑劑被供給至該第一構件(11)的該圓柱形部分和該第二構件(6)的該主要本體(6a)之間的空間，並從該空間的第二軸向側供給，及由於供給該潤滑劑的壓力，在該空間內的該潤滑劑經由該連接部分(31b)和該第一延伸部分(6b)之間的空隙，而被從該接觸部分(31c)和該第二延伸部分(6c)的該密封表面(41)之間的間隙排放。 A sealing structure (1) is characterized by comprising: a first component (11) having a cylindrical portion; a second component (6) having a main body (6a), the main body (6a) being located radially inward of the cylindrical portion and being arranged concentrically with the first component (11) so as to rotate relative to the first component (11); and an annular sealing component (7) attached to the first component (11) and constructed to seal the space between the first component (11) and the second component (6) so as to supply a lubricant to the space, wherein: the second component (6) further comprises a first extension portion (6b) and a second extension portion (6c), the first extension portion (6b) extending radially outward from a portion of the main body (6a) on a first axial side, the second extension portion (6c) extending radially outward from a portion of the main body (6a) on a first axial side, The first extension portion (6c) extends from the radial outer end of the first extension portion (6b) in the second axial direction and is provided with a sealing surface (41) with a radial surface facing inward; and the annular sealing member (7) includes: a fixing portion fixed to the first member (11), a rubber lip (31) having a base portion (31a), a contact portion (31c), and a connecting portion (31b), wherein the base portion (31a) extends from the fixing portion in the first axial direction, the contact portion (31c) is provided with a gap between the contact portion (31c) and the base portion (31a) at a radially outer portion of the base portion (31a) and is constructed to contact the sealing surface (41), and the connecting portion (31b) is connected to a portion of the base portion (31a) on the first axial side. The first axial side of the contact portion (31c) is provided with a pressing member disposed between the base portion (31a) and the contact portion (31c) to press the contact portion (31c) toward the sealing surface (41); and a supporting portion (45) is disposed along the base portion (31a) and has a higher rigidity than the base portion (31a). The fixing portion comprises a metal member (34) attached to the first member (11); the supporting portion (45) is separated from the metal member (34), and the supporting portion (45) comprises a cylindrical supporting body portion (46) and an auxiliary portion (47), wherein the cylindrical supporting body portion (46) extends along the base portion (31a) in an axial direction, and the auxiliary portion (47) The auxiliary portion (47) is integrally formed with the cylindrical supporting body portion (46) and is constructed to contact a portion of the metal member (34) in the axial direction, the auxiliary portion (47) extends radially inwardly in the second axial direction from the end portion (46a) of the cylindrical supporting body portion (46), and the lubricant is supplied to the cylindrical portion of the first member (11) and the second member ( 6) and is supplied from the second axial side of the space, and due to the pressure of the lubricant supplied, the lubricant in the space is discharged from the gap between the contact portion (31c) and the sealing surface (41) of the second extension portion (6c) through the gap between the connecting portion (31b) and the first extension portion (6b). 如請求項1的密封構造(1)，其中：該金屬構件(34)具有附接至該第一構件(11)之圓柱形部分和從該圓柱形部分徑向朝內延伸的環狀部分； 該輔助部分(47)從該圓柱形支撐本體部分(46)之第二軸向端部徑向朝內地延伸，並具有環狀形狀；及該輔助部分(47)的徑向內端相對於該環狀部分之徑向內端進一步徑向朝內突出。 A sealing structure (1) as claimed in claim 1, wherein: the metal member (34) has a cylindrical portion attached to the first member (11) and an annular portion extending radially inward from the cylindrical portion; the auxiliary portion (47) extends radially inward from the second axial end of the cylindrical supporting body portion (46) and has an annular shape; and the radial inner end of the auxiliary portion (47) further protrudes radially inward relative to the radial inner end of the annular portion. 一種密封構造(1)，其特徵在於包含：第一構件(11)，具有圓柱形部分；第二構件(6)，具有主要本體(6a)，該主要本體(6a)坐落在該圓柱形部分的徑向內側，並與該第一構件(11)同心地設置，以便相對於該第一構件(11)旋轉；及環狀密封構件(7)，其附接至該第一構件(11)且建構成密封該第一構件(11)與該第二構件(6)之間的空間，以潤滑劑供給該空間，其中：該第二構件(6)更包括第一延伸部分(6b)和第二延伸部分(6c)，該第一延伸部分(6b)從該主要本體(6a)之一部分徑向往外地延伸在第一軸向側上，該第二延伸部分(6c)從該第一延伸部分(6b)的徑向外端延伸於第二軸向方向中，並設有徑向面朝內之密封表面(41)；及該環狀密封構件(7)包括：固定部分，固定至該第一構件(11)，橡膠唇部(31)，具有基底部分(31a)、接觸部分(31c)、及連接部分(31b)，該基底部分(31a)從該固定部分在第一軸向方向中延伸，該接觸部分(31c)於該基底部分(31a)的徑向往外處設有在該接觸部分(31c)與該基底部分(31a)之間的間隙，並建構成接觸該密封表面(41)，及該連 接部分(31b)連接該第一軸向側上之基底部分(31a)的一部分和該第一軸向側上之接觸部分(31c)的一部分，壓按構件，設於該基底部分(31a)及該接觸部分(31c)之間，以將該接觸部分(31c)壓按朝該密封表面(41)，及支撐部分(45)，沿著該基底部分(31a)設置，且具有比該基底部分(31a)更高的剛性，其中該接觸部分(31c)具有面向該密封表面(41)之面向表面(31c2)；及該面向表面(31c2)具有完全接觸區域(R1)和部分接觸區域(R2)，該完全接觸區域(R1)設在該面向表面(31c2)之對應於空間外側的第二軸向側上的部分中，並建構成在該完全接觸區域(R1)之整個圓周上接觸該密封表面(41)，且該部分接觸區域(R2)設在該面向表面(31c2)之對應於空間側之第一軸向側上的部分中，並建構成在該部分接觸區域(R2)的圓周方向中不連續地接觸該密封表面(41)。 A sealing structure (1) is characterized by comprising: a first component (11) having a cylindrical portion; a second component (6) having a main body (6a), the main body (6a) being located radially inward of the cylindrical portion and being arranged concentrically with the first component (11) so as to rotate relative to the first component (11); and an annular sealing component (7) attached to the first component (11) and constructed to seal the space between the first component (11) and the second component (6) so as to supply a lubricant to the space, wherein: the second component (6) further comprises a first extension portion (6b) and a second extension portion (6c), the first extension portion The first extension portion (6b) extends radially outward from a portion of the main body (6a) on the first axial side, the second extension portion (6c) extends from the radial outer end of the first extension portion (6b) in the second axial direction, and is provided with a sealing surface (41) with a radial surface facing inward; and the annular sealing member (7) comprises: a fixing portion fixed to the first member (11), a rubber lip (31) having a base portion (31a), a contact portion (31c), and a connecting portion (31b), the base portion (31a) extending from the fixing portion in the first axial direction, the contact portion (31c) being provided radially outward from the base portion (31a) The contact portion (31c) has a gap between the contact portion (31c) and the base portion (31a) and is constructed to contact the sealing surface (41), and the connecting portion (31b) connects a portion of the base portion (31a) on the first axial side and a portion of the contact portion (31c) on the first axial side, a pressing member is provided between the base portion (31a) and the contact portion (31c) to press the contact portion (31c) toward the sealing surface (41), and a supporting portion (45) is provided along the base portion (31a) and has a higher rigidity than the base portion (31a), wherein the contact portion (31c) has a surface The facing surface (31c2) faces the sealing surface (41); and the facing surface (31c2) has a full contact area (R1) and a partial contact area (R2), the full contact area (R1) is arranged in a portion of the facing surface (31c2) on a second axial side corresponding to the outer side of the space, and is constructed to contact the sealing surface (41) on the entire circumference of the full contact area (R1), and the partial contact area (R2) is arranged in a portion of the facing surface (31c2) on a first axial side corresponding to the space side, and is constructed to contact the sealing surface (41) discontinuously in the circumferential direction of the partial contact area (R2). 如請求項3的密封構造(1)，其中：該壓按構件係環帶彈簧(51)；及該完全接觸區域(R1)與該部分接觸區域(R2)之間的邊界(L)坐落於該第一軸向側上的環帶彈簧(51)之端部與該環帶彈簧(51)的中心(51a)之間的軸向範圍中。 The sealing structure (1) of claim 3, wherein: the pressing member is an annular spring (51); and the boundary (L) between the full contact area (R1) and the partial contact area (R2) is located in the axial range between the end of the annular spring (51) on the first axial side and the center (51a) of the annular spring (51).

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