TW202100400A

TW202100400A - Bicycle brake lever

Info

Publication number: TW202100400A
Application number: TW108122326A
Authority: TW
Inventors: 陳朝宮; 蔡賜芳; 蔡伯謙
Original assignee: 彥豪金屬工業股份有限公司
Priority date: 2019-06-26
Filing date: 2019-06-26
Publication date: 2021-01-01
Also published as: TWI699307B

Abstract

A bicycle brake lever includes a main body, a lever, a first piston, a second piston and an elastic component. The main body has two accommodation space and an oil outlet. One accommodation space is located between the other accommodation space and oil outlet, and the oil outlet is connected to one of accommodation spaces. The lever is pivotably disposed on the main body. The first piston is connected to the lever, and at least a portion of the first piston, the second piston and the elastic component are located in the accommodation space which is located away from the oil outlet. The second piston is movably sleeved on the first piston, and the second piston has an outer diameter larger than that of the first piston. The elastic component is located at a side of the second piston away from the oil outlet, and two opposite ends of the elastic component are respectively connected the first piston and the second piston. When the first piston is moved toward the oil outlet in a distance which is smaller than a predetermined distance, the two accommodation space are connected to each other. When the first piston is moved toward the oil outlet in a distance which is larger than the predetermined distance, the first piston makes the two accommodation space not connected to each other.

Description

自行車煞車把手Bicycle brake handle

本發明係關於一種自行車煞車把手，特別是一種具有外徑不同之二活塞的自行車煞車把手。The invention relates to a bicycle brake handle, particularly a bicycle brake handle with two pistons with different outer diameters.

近年來自行車的市場蓬勃發展，無論是競賽型的高階自行車，或是作為代步工具及休閒娛樂的大眾型自行車，都受到消費者的喜愛，促使廠商更加重視使用者對於自行車功能的需求，而在車體材料及配備功能上不斷地改善精進，但目前自行車仍有需要改善之處。In recent years, the bicycle market has been booming. Whether it is a high-end racing bicycle or a popular bicycle used as a means of transportation and leisure entertainment, it has been favored by consumers, prompting manufacturers to pay more attention to the needs of users for bicycle functions. The body materials and equipment functions continue to improve, but there are still areas for improvement in bicycles.

以自行車的煞車來說，用於制動車輪的卡鉗是經由煞車把手來控制，且煞車把手是透過液壓油控制卡鉗。當煞車把手之煞車拉桿被按壓時，會帶動煞車把手內的活塞移動而推動液壓油，接著液壓油會致動卡鉗，來讓卡鉗夾持煞車盤以制動車輪。為了使卡鉗迅速夾持煞車盤，目前常見的作法大多是加大煞車把手內之活塞的外徑。然而，加大活塞的外徑會使得活塞受到液壓油作用的面積增加，故需以較大的力量按壓煞車拉桿才可令活塞產生足夠的油壓來維持卡鉗的夾持力，而使得煞車拉桿的按壓手感降低。因此，如何兼具讓卡鉗迅速夾持煞車盤及煞車拉桿具有較佳的按壓手感實為此領域研發人員待解決之問題之一。For bicycle brakes, the calipers used to brake the wheels are controlled by the brake handles, and the brake handles are controlled by hydraulic oil. When the brake lever of the brake lever is pressed, the piston in the brake lever will move to push the hydraulic oil, and then the hydraulic oil will actuate the caliper so that the caliper clamps the brake disc to brake the wheel. In order to enable the caliper to quickly clamp the brake disc, the current common practice is to enlarge the outer diameter of the piston in the brake handle. However, increasing the outer diameter of the piston will increase the area that the piston is exposed to by the hydraulic oil. Therefore, it is necessary to press the brake lever with greater force to make the piston generate enough oil pressure to maintain the clamping force of the caliper, and the brake lever The pressing feel is reduced. Therefore, how to make the caliper quickly clamp the brake disc and the brake lever to have a better pressing feel is one of the problems to be solved by the researchers in this field.

本發明在於提供一種自行車煞車把手，藉以解決先前技術中所述之加大活塞之外徑的設計難以兼具讓卡鉗迅速夾持煞車盤及煞車拉桿具有良好的按壓手感的問題。The present invention is to provide a bicycle brake handle to solve the problem that the design of increasing the outer diameter of the piston described in the prior art is difficult to simultaneously allow the caliper to quickly clamp the brake disc and the brake lever to have a good pressing feel.

本發明之一實施例所揭露之一種自行車煞車把手，包含一把手本體、一煞車拉桿、一第一活塞、一第二活塞及一第一彈性件。把手本體具有一第一容置槽、一第二容置槽及一出油口。第一容置槽位於第二容置槽及出油口之間，出油口連通第一容置槽遠離第二容置槽的一側。煞車拉桿樞設於把手本體。第一活塞連接於煞車拉桿，且第一活塞至少部分位於第二容置槽。第二活塞位於第二容置槽，並套設於第一活塞，第二活塞之外徑大於第一活塞的外徑，第二活塞可相對第一活塞移動。第一彈性件位於第二容置槽，並位於第二活塞遠離第一容置槽的一側，且第一彈性件的相對二端分別連接第二活塞及第一活塞。當第一活塞從一初始位置朝出油口移動的距離小於一預定距離時，第一容置槽連通於第二容置槽，且第一活塞透過第一彈性件一併帶動第二活塞移動。當第一活塞從初始位置朝出油口移動的距離大於預定距離時，第一活塞令第一容置槽與第二容置槽不連通，且第一活塞相對第二活塞移動並壓縮第一彈性件。A bicycle brake handle disclosed in an embodiment of the present invention includes a handle body, a brake lever, a first piston, a second piston, and a first elastic member. The handle body has a first containing groove, a second containing groove and an oil outlet. The first accommodating groove is located between the second accommodating groove and the oil outlet, and the oil outlet is connected to a side of the first accommodating groove away from the second accommodating groove. The brake lever is pivoted on the handle body. The first piston is connected to the brake rod, and the first piston is at least partially located in the second accommodating groove. The second piston is located in the second accommodating groove and sleeved on the first piston. The outer diameter of the second piston is larger than the outer diameter of the first piston, and the second piston can move relative to the first piston. The first elastic member is located in the second accommodating groove and on the side of the second piston away from the first accommodating groove, and two opposite ends of the first elastic member are respectively connected to the second piston and the first piston. When the distance that the first piston moves from an initial position toward the oil outlet is less than a predetermined distance, the first accommodating groove is connected to the second accommodating groove, and the first piston drives the second piston to move together through the first elastic member . When the distance of the first piston moving from the initial position toward the oil outlet is greater than the predetermined distance, the first piston causes the first accommodating groove to be disconnected from the second accommodating groove, and the first piston moves relative to the second piston and compresses the first Elastic pieces.

根據上述實施例之自行車煞車把手，由於第二活塞的外徑大於第一活塞的外徑，且當第一活塞從初始位置移動的距離小於預定距離時，第一容置槽連通於第二容置槽，且第二活塞與第一活塞同動，故按壓煞車拉桿以帶動第一活塞移動小於預定距離的距離時，第一活塞及第二活塞會一同推動液壓油，而迅速地致動與出油口連接的自行車煞車卡鉗進行煞車。According to the bicycle brake handle of the above embodiment, since the outer diameter of the second piston is greater than the outer diameter of the first piston, and when the distance of the first piston moving from the initial position is less than the predetermined distance, the first accommodating groove is connected to the second accommodating The second piston moves simultaneously with the first piston. Therefore, when the brake lever is pressed to drive the first piston to move a distance less than a predetermined distance, the first piston and the second piston will push the hydraulic oil together to quickly actuate and The bicycle brake caliper connected to the oil outlet performs braking.

此外，由於在第一活塞從初始位置移動的距離大於預定距離的狀況下，第一容置槽與第二容置槽不連通，且第一活塞相對第二活塞移動並壓縮第一彈性件，故在第一活塞移動的距離大於預定距離之後，是僅透過外徑較小之第一活塞對於液壓油加壓。因此，施予煞車拉桿較小的力即可令第一活塞產生足夠的油壓，以維持卡鉗的夾持力，故可維持煞車拉桿的按壓手感。In addition, since the first accommodating groove is not connected with the second accommodating groove under the condition that the distance of the first piston moving from the initial position is greater than the predetermined distance, and the first piston moves relative to the second piston and compresses the first elastic member, Therefore, after the moving distance of the first piston is greater than a predetermined distance, the hydraulic oil is pressurized only through the first piston with a smaller outer diameter. Therefore, applying a small force to the brake lever can cause the first piston to generate sufficient oil pressure to maintain the clamping force of the caliper, so that the pressing feel of the brake lever can be maintained.

請參閱圖1至圖4。圖1為根據本發明第一實施例之自行車煞車把手的立體示意圖。圖2為圖1的分解示意圖。圖3為沿圖1之其中一割面線的剖視示意圖。圖4為沿圖1之另一割面線的剖視示意圖。Please refer to Figure 1 to Figure 4. Fig. 1 is a perspective view of a bicycle brake handle according to a first embodiment of the present invention. Figure 2 is an exploded schematic diagram of Figure 1. Fig. 3 is a schematic cross-sectional view taken along one of the cutting plane lines of Fig. 1. Fig. 4 is a schematic cross-sectional view taken along another cutting line of Fig. 1.

本實施例揭露了一自行車煞車把手1。自行車煞車把手1例如為自行車的右煞車把手。自行車煞車把手1包含一把手本體10、一煞車拉桿20、一第一活塞30、一第二活塞40及一第一彈性件50。在本實施例或其他實施例中，自行車煞車把手1還可包含一油槽蓋60、一連桿70、一密封環80、一固定件90、一止擋環100及一第二彈性件110。This embodiment discloses a bicycle brake handle 1. The bicycle brake handle 1 is, for example, the right brake handle of a bicycle. The bicycle brake handle 1 includes a handle body 10, a brake lever 20, a first piston 30, a second piston 40 and a first elastic member 50. In this embodiment or other embodiments, the bicycle brake handle 1 may further include an oil sump cover 60, a connecting rod 70, a sealing ring 80, a fixing member 90, a stop ring 100 and a second elastic member 110.

把手本體10具有一第一容置槽11、一第二容置槽12、一出油口13、三連通口14、15、16及一儲油槽17。第一容置槽11位於第二容置槽12及出油口13之間，且出油口13連通第一容置槽11遠離第二容置槽12的一側。在本實施例中，出油口13例如與自行車煞車卡鉗(未繪示)連通，且自行車煞車卡鉗用以夾持與車輪同動的煞車盤。連通口14較二連通口15、16靠近第一容置槽11，且二連通口15、16至出油口13的距離例如相等，儲油槽17透過三連通口14、15、16連通第二容置槽12。油槽蓋60裝設於把手本體10，且油槽蓋60遮蔽儲油槽17。The handle body 10 has a first accommodating groove 11, a second accommodating groove 12, an oil outlet 13, three communication ports 14, 15, and 16, and an oil storage groove 17. The first accommodating groove 11 is located between the second accommodating groove 12 and the oil outlet 13, and the oil outlet 13 is connected to a side of the first accommodating groove 11 away from the second accommodating groove 12. In this embodiment, the oil outlet 13 is, for example, communicated with a bicycle brake caliper (not shown), and the bicycle brake caliper is used to clamp a brake disc that moves simultaneously with the wheel. The communication port 14 is closer to the first accommodating tank 11 than the two communication ports 15, 16 and the distance from the two communication ports 15, 16 to the oil outlet 13 is, for example, the same, and the oil storage tank 17 is connected to the second through the three communication ports 14, 15, 16住槽12。 Housing tank 12. The oil tank cover 60 is installed on the handle body 10, and the oil tank cover 60 covers the oil storage tank 17.

煞車拉桿20樞設於把手本體10。第一活塞30的部分位於第二容置槽12。第一活塞30遠離出油口13的一端透過連桿70連接於煞車拉桿20。第一活塞30具有一端面31、一環側壁面32、一凹槽33及二旁通孔34。端面31面向出油口13，環側壁面32連接端面31。凹槽33自端面31沿第一活塞30的軸向延伸，且凹槽33連通第一容置槽11。二旁通孔34自環側壁面32沿第一活塞30的徑向延伸，二旁通孔34透過凹槽33連通第一容置槽11。The brake lever 20 is pivoted to the handle body 10. A part of the first piston 30 is located in the second containing groove 12. The end of the first piston 30 away from the oil outlet 13 is connected to the brake lever 20 through a connecting rod 70. The first piston 30 has an end surface 31, a ring side wall surface 32, a groove 33 and two bypass holes 34. The end surface 31 faces the oil outlet 13, and the ring side wall surface 32 is connected to the end surface 31. The groove 33 extends from the end surface 31 along the axial direction of the first piston 30, and the groove 33 communicates with the first containing groove 11. The two bypass holes 34 extend from the ring side wall surface 32 along the radial direction of the first piston 30, and the two bypass holes 34 communicate with the first accommodating groove 11 through the groove 33.

密封環80位於第一容置槽11及第二容置槽12之間，且把手本體10及第一活塞30沿密封環80之徑向夾持密封環80。固定件90位於密封環80與第二容置槽12之間，並與把手本體10沿密封環80之軸向夾持密封環80。第一活塞30可移動地穿設於固定件90，且固定件90具有一環形內壁面91。固定件90的環形內壁面91面向第一活塞30，且固定件90的環形內壁面91與第一活塞30之間具有一縫隙120，此縫隙120連通第二容置槽12。The sealing ring 80 is located between the first accommodating groove 11 and the second accommodating groove 12, and the handle body 10 and the first piston 30 clamp the sealing ring 80 along the radial direction of the sealing ring 80. The fixing member 90 is located between the sealing ring 80 and the second receiving groove 12, and clamps the sealing ring 80 with the handle body 10 along the axial direction of the sealing ring 80. The first piston 30 movably passes through the fixing member 90, and the fixing member 90 has an annular inner wall surface 91. The annular inner wall surface 91 of the fixing member 90 faces the first piston 30, and there is a gap 120 between the annular inner wall surface 91 of the fixing member 90 and the first piston 30, and the gap 120 communicates with the second containing groove 12.

第二活塞40位於第二容置槽12，且整體第二活塞40之外徑D1大於第一活塞30的外徑D2。第二活塞40包含一主體41、一內密封環42、一第一外密封環43及一第二外密封環44。第二活塞40之主體41套設於第一活塞30，且主體41可相對第一活塞30移動。內密封環42被夾設於第一活塞30及主體41之間。第一外密封環43及第二外密封環44套設於主體41並被夾設於主體41及把手本體10之間，且第一外密封環43較第二外密封環44遠離第一容置槽11。在本實施例中，三連通口14、15、16皆位於第一外密封環43鄰近第一容置槽11的一側。藉此，第二外密封環44可避免液壓油進入第二活塞40遠離第一容置槽11之一側。The second piston 40 is located in the second accommodating groove 12, and the outer diameter D1 of the overall second piston 40 is greater than the outer diameter D2 of the first piston 30. The second piston 40 includes a main body 41, an inner sealing ring 42, a first outer sealing ring 43 and a second outer sealing ring 44. The main body 41 of the second piston 40 is sleeved on the first piston 30, and the main body 41 can move relative to the first piston 30. The inner seal ring 42 is sandwiched between the first piston 30 and the main body 41. The first outer seal ring 43 and the second outer seal ring 44 are sleeved on the main body 41 and sandwiched between the main body 41 and the handle body 10, and the first outer seal ring 43 is farther from the first container than the second outer seal ring 44.置槽11。 Set slot 11. In this embodiment, the three communicating ports 14, 15, and 16 are all located on the side of the first outer sealing ring 43 adjacent to the first containing groove 11. Thereby, the second outer sealing ring 44 can prevent the hydraulic oil from entering the side of the second piston 40 away from the first accommodating groove 11.

在本實施例中，第一活塞30遠離第一容置槽11之一側還具有一凸緣35。第一彈性件50套設於第一活塞30，且第一彈性件50的相對二端分別抵靠凸緣35及第二活塞40的主體41。止擋環100裝設於第一活塞30並位於第二活塞40遠離第一彈性件50的一側，並用以止擋第二活塞40。In this embodiment, the first piston 30 further has a flange 35 on one side away from the first accommodating groove 11. The first elastic member 50 is sleeved on the first piston 30, and two opposite ends of the first elastic member 50 abut against the flange 35 and the main body 41 of the second piston 40 respectively. The stop ring 100 is installed on the first piston 30 and located on the side of the second piston 40 away from the first elastic member 50, and is used to stop the second piston 40.

此外，把手本體10還具有一槽底面18。槽底面18面向第一容置槽11，並位於第一容置槽11及出油口13的連接處。第二彈性件110的部分位於第一容置槽11，且第二彈性件110之另一部分位於第一活塞30之凹槽33。第二彈性件110的相對二端分別抵靠槽底面18及第一活塞30，用以提供第一活塞30朝遠離出油口13之方向的作用力。In addition, the handle body 10 also has a groove bottom surface 18. The groove bottom surface 18 faces the first accommodating groove 11 and is located at the junction of the first accommodating groove 11 and the oil outlet 13. A part of the second elastic element 110 is located in the first containing groove 11, and another part of the second elastic element 110 is located in the groove 33 of the first piston 30. Two opposite ends of the second elastic member 110 respectively abut against the groove bottom surface 18 and the first piston 30 to provide the first piston 30 with a force away from the oil outlet 13.

在本實施例中，使用者可按壓於煞車拉桿20，使得煞車拉桿20相對把手本體10樞轉而透過連桿70帶動第一活塞30，來讓第一活塞30從一初始位置P1朝出油口13移動。In this embodiment, the user can press the brake lever 20 so that the brake lever 20 pivots relative to the handle body 10 and drives the first piston 30 through the connecting rod 70 to allow the first piston 30 to flow out from an initial position P1.口13 moves.

如圖4所示，當第一活塞30位於初始位置P1時，第一彈性件50令第二活塞40之主體41抵靠於止擋環100。此時，二旁通孔34位於密封環80及第二活塞40之間，且二旁通孔34透過縫隙120連通第二容置槽12，來讓第一容置槽11連通第二容置槽12。As shown in FIG. 4, when the first piston 30 is at the initial position P1, the first elastic member 50 makes the main body 41 of the second piston 40 abut against the stop ring 100. At this time, the two bypass holes 34 are located between the seal ring 80 and the second piston 40, and the two bypass holes 34 communicate with the second accommodating groove 12 through the gap 120 to allow the first accommodating groove 11 to communicate with the second accommodating groove. Slot 12.

接著，請參閱圖5，圖5為圖4之第一活塞移動之距離小於預定距離的剖視示意圖。Next, please refer to FIG. 5, which is a schematic cross-sectional view of the first piston moving distance of FIG. 4 less than a predetermined distance.

當第一活塞30從初始位置P1朝出油口13移動的距離小於一預定距離Ta時，第一活塞30會壓縮第二彈性件110，且二旁通孔34仍是位於密封環80及第二活塞40之間，使得二旁通孔34仍可透過縫隙120連通第二容置槽12，來讓第一容置槽11連通於第二容置槽12。也就是說，在二旁通孔34尚未被密封環80遮蔽之前，第一容置槽11與第二容置槽12為相連通的狀態。且，在這樣的情況下，由於第一容置槽11連通於第二容置槽12，故移動的第一活塞30會透過第一彈性件50帶動第二活塞40移動，使得第一活塞30及第二活塞40一同推動液壓油，而迅速致動自行車煞車卡鉗夾持煞車盤，以進行煞車。When the distance the first piston 30 moves from the initial position P1 toward the oil outlet 13 is less than a predetermined distance Ta, the first piston 30 will compress the second elastic member 110, and the two bypass holes 34 are still located in the sealing ring 80 and the first Between the two pistons 40, the two bypass holes 34 can still communicate with the second accommodating groove 12 through the gap 120, so that the first accommodating groove 11 is connected to the second accommodating groove 12. That is to say, before the two bypass holes 34 are not covered by the sealing ring 80, the first containing groove 11 and the second containing groove 12 are in a connected state. Moreover, in this case, since the first accommodating groove 11 is connected to the second accommodating groove 12, the moving first piston 30 will drive the second piston 40 to move through the first elastic member 50, so that the first piston 30 The hydraulic oil is pushed together with the second piston 40 to quickly actuate the bicycle brake caliper to clamp the brake disc for braking.

此外，當第一活塞30從初始位置P1以小於預定距離Ta之距離朝出油口13移動時，第二外密封環44會通過連通口14，而使儲油槽17(如圖3所示)與第二容置槽12中位於第二外密封環44鄰近第一容置槽11之一側的部分不連通，故可確保第二活塞40所推動的液壓油集中傳遞至出油口13，而不會分散至儲油槽17(如圖3所示)。In addition, when the first piston 30 moves from the initial position P1 toward the oil outlet 13 by a distance less than the predetermined distance Ta, the second outer seal ring 44 will pass through the communication port 14 to make the oil reservoir 17 (as shown in FIG. 3) It is disconnected from the part of the second accommodating groove 12 on the side of the second outer seal ring 44 adjacent to the first accommodating groove 11, so it can ensure that the hydraulic oil pushed by the second piston 40 is concentratedly transmitted to the oil outlet 13. It will not be dispersed to the oil storage tank 17 (as shown in Figure 3).

接著，請參閱圖6及圖7，圖6為圖4之第一活塞移動之距離等於預定距離的剖視示意圖。圖7為圖4之第一活塞移動之距離大於預定距離的剖視示意圖。Next, please refer to FIGS. 6 and 7. FIG. 6 is a schematic cross-sectional view of the first piston moving distance of FIG. 4 equal to a predetermined distance. FIG. 7 is a schematic cross-sectional view of the distance moved by the first piston of FIG. 4 greater than a predetermined distance.

如圖6所示，當第一活塞30繼續移動而從初始位置P1朝出油口13移動的距離等於預定距離Ta時，第一活塞30之二旁通孔34會被密封環80遮蔽，而使二旁通孔34與縫隙120不連通，從而讓第一容置槽11與第二容置槽12不連通。接著，如圖7所示，在第一活塞30再繼續朝出油口13移動的情況下，第一容置槽11與第二容置槽12仍保持於不連通，且第一活塞30會相對第二活塞40移動並壓縮第一彈性件50。As shown in FIG. 6, when the first piston 30 continues to move and the distance from the initial position P1 toward the oil outlet 13 is equal to the predetermined distance Ta, the second bypass hole 34 of the first piston 30 will be shielded by the seal ring 80, and The two bypass holes 34 and the gap 120 are not connected, so that the first accommodating groove 11 and the second accommodating groove 12 are not connected. Then, as shown in FIG. 7, when the first piston 30 continues to move toward the oil outlet 13, the first accommodating groove 11 and the second accommodating groove 12 still remain disconnected, and the first piston 30 will The first elastic member 50 is moved relative to the second piston 40 and compressed.

在本實施例中，由於在第一活塞30從初始位置P1移動的距離大於預定距離Ta的狀況下，第一容置槽11與第二容置槽12不連通，且第一活塞30相對第二活塞40移動並壓縮第一彈性件50，故在第一活塞30移動的距離大於預定距離Ta之後，是僅透過外徑較小之第一活塞30對於液壓油加壓。因此，施予煞車拉桿20(如圖2所示)較小的力即可令第一活塞30產生足夠的油壓，以維持卡鉗的夾持力，故可維持煞車拉桿20的按壓手感。In this embodiment, since the first piston 30 moves from the initial position P1 by a distance greater than the predetermined distance Ta, the first accommodating groove 11 and the second accommodating groove 12 are not connected, and the first piston 30 is relatively The second piston 40 moves and compresses the first elastic member 50, so after the first piston 30 moves more than the predetermined distance Ta, the hydraulic oil is pressurized only through the first piston 30 with a smaller outer diameter. Therefore, applying a small force to the brake lever 20 (as shown in FIG. 2) can cause the first piston 30 to generate sufficient oil pressure to maintain the clamping force of the caliper, so that the pressing feel of the brake lever 20 can be maintained.

當使用者放開煞車拉桿20之後，被壓縮的第一彈性件50及第二彈性件110即會回彈，而帶動第一活塞30回到初始位置P1，且第二活塞40再次抵靠於止擋環100。When the user releases the brake lever 20, the compressed first elastic member 50 and the second elastic member 110 will rebound, and drive the first piston 30 back to the initial position P1, and the second piston 40 will abut against Stop ring 100.

在本實施例中，自行車煞車把手1包含有固定件90的設置，並非用以限定本發明。在其他實施例中，自行車煞車把手可無固定件。In this embodiment, the bicycle brake handle 1 includes the fixing member 90, which is not intended to limit the present invention. In other embodiments, the bicycle brake handle may have no fasteners.

此外，自行車煞車把手1並不限包含有止擋環100。在其他實施例中，自行車煞車把手可無止擋環。In addition, the bicycle brake handle 1 is not limited to include a stop ring 100. In other embodiments, the bicycle brake handle may have no stop ring.

另外，旁通孔34是經由凹槽33而間接連通於第一容置槽11，但並不以此為限。在其他實施例中，旁通孔可直接連通於第一容置槽。In addition, the bypass hole 34 is indirectly connected to the first accommodating groove 11 through the groove 33, but it is not limited thereto. In other embodiments, the bypass hole may directly communicate with the first accommodating groove.

接著，請參閱圖8，圖8為根據本發明第二實施例之自行車煞車把手的剖視示意圖。Next, please refer to FIG. 8, which is a schematic cross-sectional view of a bicycle brake handle according to a second embodiment of the present invention.

本實施例揭露了另一自行車煞車把手。本實施例之自行車煞車把手類似於第一實施例的自行車煞車把手1，以下僅會針對二者之間的差異之處進行說明，關於相同及相似的部分則不再贅述。This embodiment discloses another bicycle brake handle. The bicycle brake handle of this embodiment is similar to the bicycle brake handle 1 of the first embodiment. The following will only describe the differences between the two, and the same and similar parts will not be repeated.

在本實施例之自行車煞車把手中，第一活塞30a包含相連的一頭部31a及一身部32a。身部32a的部分位於把手本體10a的第二容置槽12a。第二活塞40a套設於身部32a，第一彈性件50a之一端連接於身部32a遠離第一容置槽11a的一端。第一活塞30a之頭部31a的外徑自鄰近把手本體10a之出油口13a的一側朝遠離出油口13a的一側漸增。In the bicycle brake handle of this embodiment, the first piston 30a includes a head 31a and a body 32a that are connected. A part of the body 32a is located in the second receiving groove 12a of the handle body 10a. The second piston 40a is sleeved on the body 32a, and one end of the first elastic member 50a is connected to an end of the body 32a away from the first accommodating groove 11a. The outer diameter of the head 31a of the first piston 30a gradually increases from the side adjacent to the oil outlet 13a of the handle body 10a to the side away from the oil outlet 13a.

密封環80a具有一穿孔81a，且穿孔81a之孔徑自鄰近出油口13a的一側朝遠離出油口13a的一側漸增。第一活塞30之頭部31a之部分的外徑小於穿孔81a的最小孔徑H1，身部32a的外徑D3大於或等於穿孔81a的最小孔徑H1。固定件90a具有一通孔92a，且通孔92a的最小孔徑H2大於第一活塞30a之身部32a的外徑D3。The sealing ring 80a has a through hole 81a, and the aperture of the through hole 81a gradually increases from the side adjacent to the oil outlet 13a to the side away from the oil outlet 13a. The outer diameter of the head 31a of the first piston 30 is smaller than the minimum hole diameter H1 of the through hole 81a, and the outer diameter D3 of the body 32a is greater than or equal to the minimum hole diameter H1 of the through hole 81a. The fixing member 90a has a through hole 92a, and the minimum hole diameter H2 of the through hole 92a is larger than the outer diameter D3 of the body 32a of the first piston 30a.

當第一活塞30a位於初始位置P2時，第一活塞30a之頭部31a的部分位於穿孔81a，頭部31a之另一部分及身部32a的部分位於通孔92a，且第一活塞30a之頭部31a與密封環80a之間有一縫隙120a。此時，第一容置槽11a透過縫隙120a連通第二容置槽12a。When the first piston 30a is at the initial position P2, the head 31a of the first piston 30a is located in the through hole 81a, the other part of the head 31a and the body 32a are located in the through hole 92a, and the head of the first piston 30a There is a gap 120a between 31a and the sealing ring 80a. At this time, the first accommodating groove 11a communicates with the second accommodating groove 12a through the gap 120a.

接著，請參閱圖9，圖9為圖8之第一活塞移動之距離小於預定距離的剖視示意圖。Next, please refer to FIG. 9. FIG. 9 is a schematic cross-sectional view of the movement distance of the first piston of FIG. 8 being less than a predetermined distance.

當第一活塞30a從初始位置P2朝出油口13a移動的距離小於預定距離Tb時，雖然縫隙120a已經變小，但縫隙120a仍使第一容置槽11a及第二容置槽12a連通，故同動的第一活塞30a及第二活塞40a可迅速地致動自行車煞車卡鉗進行煞車。When the distance that the first piston 30a moves from the initial position P2 toward the oil outlet 13a is less than the predetermined distance Tb, although the gap 120a has become smaller, the gap 120a still connects the first accommodating groove 11a and the second accommodating groove 12a. Therefore, the simultaneous first piston 30a and the second piston 40a can quickly actuate the bicycle brake caliper for braking.

接著，請參閱圖10及圖11。圖10為圖8之第一活塞移動之距離等於預定距離的剖視示意圖。圖11為圖8之第一活塞移動之距離大於預定距離的剖視示意圖。Next, please refer to Figure 10 and Figure 11. Fig. 10 is a schematic cross-sectional view of the distance moved by the first piston of Fig. 8 equal to a predetermined distance. Fig. 11 is a schematic cross-sectional view of the distance moved by the first piston of Fig. 8 greater than a predetermined distance.

如圖10所示，當第一活塞30a從初始位置P2朝出油口13a移動的距離等於預定距離Tb時，第一活塞30a之頭部31a填補縫隙120a(如圖9所示)，而令第一容置槽11a與第二容置槽12a不連通。接著，如圖11所示，在第一活塞30a繼續朝出油口13a移動的情況下，第一容置槽11a與第二容置槽12a仍保持於不連通，且第一活塞30a會相對第二活塞40a移動並壓縮第一彈性件50a，且第一活塞30a之身部32a會貫穿穿孔81a及通孔92a。As shown in Figure 10, when the first piston 30a moves from the initial position P2 toward the oil outlet 13a by a predetermined distance Tb, the head 31a of the first piston 30a fills the gap 120a (as shown in Figure 9), and The first accommodating groove 11a and the second accommodating groove 12a are not connected. Next, as shown in Figure 11, when the first piston 30a continues to move toward the oil outlet 13a, the first accommodating groove 11a and the second accommodating groove 12a are still kept out of communication, and the first piston 30a will face each other The second piston 40a moves and compresses the first elastic member 50a, and the body 32a of the first piston 30a penetrates the through hole 81a and the through hole 92a.

在本實施例中，在第一活塞30a位於初始位置P2的狀況下，第一活塞30a之頭部31a及身部32a的位置並非用以限定本發明。在其他實施例中，在第一活塞位於初始位置的狀況下，第一活塞之頭部及身部可完全位於第二容置槽。In this embodiment, when the first piston 30a is at the initial position P2, the positions of the head 31a and the body 32a of the first piston 30a are not intended to limit the present invention. In other embodiments, when the first piston is in the initial position, the head and body of the first piston can be completely located in the second receiving groove.

在前述實施例中，自行車煞車把手為右煞車把手，但並不以此為限。在其他實施例中，自行車煞車把手可以是左煞車把手。In the foregoing embodiment, the bicycle brake handle is the right brake handle, but it is not limited to this. In other embodiments, the bicycle brake handle may be a left brake handle.

根據上述實施例之自行車煞車把手，由於第二活塞的外徑大於第一活塞的外徑，且當第一活塞從初始位置移動的距離小於預定距離時，第一容置槽連通於第二容置槽，且第二活塞與第一活塞同動，故按壓煞車拉桿以帶動第一活塞移動小於預定距離的距離時，第一活塞及第二活塞可一同推動液壓油，而迅速地致動與出油口連接的自行車煞車卡鉗夾持煞車盤，以進行煞車。According to the bicycle brake handle of the above embodiment, since the outer diameter of the second piston is greater than the outer diameter of the first piston, and when the distance of the first piston moving from the initial position is less than the predetermined distance, the first accommodating groove is connected to the second accommodating The second piston moves simultaneously with the first piston, so when the brake lever is pressed to drive the first piston to move a distance less than a predetermined distance, the first piston and the second piston can push the hydraulic oil together to quickly actuate the The bicycle brake caliper connected to the oil outlet clamps the brake disc for braking.

雖然本發明以前述之諸項實施例揭露如上，然其並非用以限定本發明，任何熟習相像技藝者，在不脫離本發明之精神和範圍內，當可作些許之更動與潤飾，因此本發明之專利保護範圍須視本說明書所附之申請專利範圍所界定者為準。Although the present invention is disclosed in the foregoing embodiments as described above, it is not intended to limit the present invention. Anyone familiar with similar art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The scope of patent protection for inventions shall be determined by the scope of patent applications attached to this specification.

1:自行車煞車把手 10、10a:把手本體 11、11a:第一容置槽 12、12a:第二容置槽 13、13a:出油口 14、15、16:連通口 17:儲油槽 18:槽底面 20:煞車拉桿 30、30a:第一活塞 31:端面 32:環側壁面 33:凹槽 34:旁通孔 35:凸緣 31a:頭部 32a:身部 40、40a:第二活塞 41:主體 42:內密封環 43:第一外密封環 44:第二外密封環 50、50a:第一彈性件 60:油槽蓋 70:連桿 80、80a:密封環 81a:穿孔 90、90a:固定件 91:環形內壁面 92a:通孔 100:止擋環 110:第二彈性件 120、120a:縫隙 D1、D2、D3:外徑 P1、P2:位置 Ta、Tb:距離 H1、H2:孔徑1: Bicycle brake handle 10.10a: Handle body 11, 11a: the first containing tank 12, 12a: the second containing tank 13, 13a: oil outlet 14, 15, 16: connecting port 17: Oil storage tank 18: groove bottom 20: Brake lever 30, 30a: first piston 31: end face 32: Ring side wall surface 33: Groove 34: Bypass hole 35: flange 31a: head 32a: body 40, 40a: second piston 41: main body 42: inner sealing ring 43: The first outer sealing ring 44: The second outer sealing ring 50, 50a: the first elastic part 60: oil tank cover 70: connecting rod 80, 80a: sealing ring 81a: Perforation 90, 90a: fixed parts 91: Annular inner wall surface 92a: Through hole 100: stop ring 110: second elastic part 120, 120a: gap D1, D2, D3: outer diameter P1, P2: location Ta, Tb: distance H1, H2: Aperture

圖1為根據本發明第一實施例之自行車煞車把手的立體示意圖。圖2為圖1的分解示意圖。圖3為沿圖1之其中一割面線的剖視示意圖。圖4為沿圖1之另一割面線的剖視示意圖。圖5為圖4之第一活塞移動之距離小於預定距離的剖視示意圖。圖6為圖4之第一活塞移動之距離等於預定距離的剖視示意圖。圖7為圖4之第一活塞移動之距離大於預定距離的剖視示意圖。圖8為根據本發明第二實施例之自行車煞車把手的剖視示意圖。圖9為圖8之第一活塞移動之距離小於預定距離的剖視示意圖。圖10為圖8之第一活塞移動之距離等於預定距離的剖視示意圖。圖11為圖8之第一活塞移動之距離大於預定距離的剖視示意圖。Fig. 1 is a perspective view of a bicycle brake handle according to a first embodiment of the present invention. Figure 2 is an exploded schematic diagram of Figure 1. Fig. 3 is a schematic cross-sectional view taken along one of the cutting plane lines of Fig. 1. Fig. 4 is a schematic cross-sectional view taken along another cutting line of Fig. 1. Fig. 5 is a schematic cross-sectional view of the first piston moving distance of Fig. 4 less than a predetermined distance. Fig. 6 is a schematic cross-sectional view of the distance moved by the first piston of Fig. 4 equal to a predetermined distance. FIG. 7 is a schematic cross-sectional view of the distance moved by the first piston of FIG. 4 greater than a predetermined distance. 8 is a schematic cross-sectional view of a bicycle brake handle according to a second embodiment of the present invention. Fig. 9 is a schematic cross-sectional view of Fig. 8 where the distance moved by the first piston is less than a predetermined distance. Fig. 10 is a schematic cross-sectional view of the distance moved by the first piston of Fig. 8 equal to a predetermined distance. Fig. 11 is a schematic cross-sectional view of the distance moved by the first piston of Fig. 8 greater than a predetermined distance.

1:自行車煞車把手 1: Bicycle brake handle

10:把手本體 10: Handle body

20:煞車拉桿 20: Brake lever

60:油槽蓋 60: oil tank cover

70:連桿 70: connecting rod

Claims

一種自行車煞車把手，包含：一把手本體，具有一第一容置槽、一第二容置槽及一出油口，該第一容置槽位於該第二容置槽及該出油口之間，該出油口連通該第一容置槽遠離該第二容置槽的一側；一煞車拉桿，樞設於該把手本體；一第一活塞，連接於該煞車拉桿，且該第一活塞至少部分位於該第二容置槽；一第二活塞，位於該第二容置槽，並套設於該第一活塞，該第二活塞之外徑大於該第一活塞的外徑，該第二活塞可相對該第一活塞移動；以及一第一彈性件，位於該第二容置槽，並位於該第二活塞遠離該第一容置槽的一側，且該第一彈性件的相對二端分別連接該第二活塞及該第一活塞；其中，當該第一活塞從一初始位置朝該出油口移動的距離小於一預定距離時，該第一容置槽連通於該第二容置槽，且該第一活塞透過該第一彈性件一併帶動該第二活塞移動，當該第一活塞從該初始位置朝該出油口移動的距離大於該預定距離時，該第一活塞令該第一容置槽與該第二容置槽不連通，且該第一活塞相對該第二活塞移動並壓縮該第一彈性件。A bicycle brake handle, including: A handle body has a first accommodating groove, a second accommodating groove and an oil outlet. The first accommodating groove is located between the second accommodating groove and the oil outlet, and the oil outlet is connected to the oil outlet. A side of the first accommodating groove away from the second accommodating groove; A brake lever is pivoted to the handle body; A first piston connected to the brake rod, and the first piston is at least partially located in the second accommodating groove; A second piston located in the second accommodating groove and sleeved on the first piston, the outer diameter of the second piston is larger than the outer diameter of the first piston, and the second piston can move relative to the first piston; as well as A first elastic member is located in the second accommodating groove and on a side of the second piston away from the first accommodating groove, and two opposite ends of the first elastic member are respectively connected to the second piston and the second piston A piston Wherein, when the distance that the first piston moves from an initial position toward the oil outlet is less than a predetermined distance, the first accommodating groove is connected to the second accommodating groove, and the first piston penetrates the first elastic The components drive the second piston to move together. When the first piston moves from the initial position toward the oil outlet by a distance greater than the predetermined distance, the first piston causes the first accommodating groove and the second accommodating groove to move. The grooves are not connected, and the first piston moves relative to the second piston and compresses the first elastic member.

如申請專利範圍第1項所述之自行車煞車把手，其中該第一活塞具有至少一旁通孔，該至少一旁通孔連通該第一容置槽，當該第一活塞從該初始位置朝該出油口移動的距離小於該預定距離時，該第一容置槽透過該至少一旁通孔連通該第二容置槽，當該第一活塞從該初始位置朝該出油口移動的距離等於或大於該預定距離時，該至少一旁通孔與該第二容置槽不連通。The bicycle brake handle described in claim 1, wherein the first piston has at least one bypass hole, the at least one bypass hole communicates with the first accommodating groove, and when the first piston moves from the initial position toward the When the moving distance of the oil port is less than the predetermined distance, the first accommodating groove communicates with the second accommodating groove through the at least one bypass hole, and when the first piston moves from the initial position toward the oil outlet, the distance is equal to or When the distance is greater than the predetermined distance, the at least one bypass hole does not communicate with the second accommodating groove.

如申請專利範圍第2項所述之自行車煞車把手，更包含一密封環，該密封環位於該第一容置槽及該第二容置槽之間，該把手本體及該第一活塞沿該密封環之徑向夾持該密封環，當該第一活塞從該初始位置朝該出油口移動的距離小於該預定距離時，該至少一旁通孔位於該密封環及該第二活塞之間，當該第一活塞從該初始位置朝該出油口移動的距離等於或大於該預定距離時，該密封環令該至少一旁通孔與該第二容置槽不連通。For example, the bicycle brake handle described in item 2 of the scope of patent application further includes a sealing ring located between the first accommodating groove and the second accommodating groove, the handle body and the first piston along the The radial direction of the seal ring clamps the seal ring, and when the distance of the first piston moving from the initial position toward the oil outlet is less than the predetermined distance, the at least one bypass hole is located between the seal ring and the second piston When the distance that the first piston moves from the initial position toward the oil outlet is equal to or greater than the predetermined distance, the sealing ring prevents the at least one bypass hole from communicating with the second accommodating groove.

如申請專利範圍第3項所述之自行車煞車把手，更包含一固定件，該固定件位於該密封環與該第二容置槽之間，並與該把手本體沿該密封環之軸向夾持該密封環，該第一活塞可移動地穿設於該固定件，該固定件具有一環形內壁面，該固定件的該環形內壁面面向該第一活塞，該固定件的該環形內壁面與該第一活塞之間具有一縫隙，該縫隙連通該第二容置槽，當該第一活塞從該初始位置朝該出油口移動的距離小於該預定距離時，該至少一旁通孔透過該縫隙連通該第二容置槽。For example, the bicycle brake handle described in item 3 of the scope of patent application further includes a fixing member located between the sealing ring and the second accommodating groove, and clamping the handle body along the axial direction of the sealing ring Holding the sealing ring, the first piston movably penetrates the fixing member, the fixing member has an annular inner wall surface, the annular inner wall surface of the fixing member faces the first piston, and the annular inner wall surface of the fixing member There is a gap between the first piston and the second accommodating groove. When the first piston moves from the initial position toward the oil outlet less than the predetermined distance, the at least one bypass hole penetrates The gap communicates with the second containing groove.

如申請專利範圍第3項所述之自行車煞車把手，其中該第一活塞更具有一端面、一環側壁面及一凹槽，該端面面向該出油口，該環側壁面連接該端面，該凹槽自該端面沿該第一活塞的軸向延伸，該凹槽連通該第一容置槽，該至少一旁通孔自該環側壁面沿該第一活塞的徑向延伸，該至少一旁通孔透過該凹槽連通該第一容置槽。For the bicycle brake handle described in item 3 of the scope of patent application, the first piston further has an end surface, a ring side wall surface and a groove, the end surface faces the oil outlet, the ring side wall surface is connected to the end surface, and the recess A groove extends from the end surface along the axial direction of the first piston, the groove communicates with the first accommodating groove, the at least one bypass hole extends from the ring side wall surface in the radial direction of the first piston, and the at least one bypass hole The first accommodating groove is connected through the groove.

如申請專利範圍第1項所述之自行車煞車把手，其中當該第一活塞從該初始位置朝該出油口移動的距離小於該預定距離時，該第一活塞與該第一容置槽之間具有一縫隙，該第二容置槽透過該縫隙連通該第一容置槽，當該第一活塞從該初始位置朝該出油口移動的距離等於或大於該預定距離時，該第一活塞填補該縫隙，而令該第二容置槽與該第一容置槽不連通。The bicycle brake handle described in item 1 of the scope of patent application, wherein when the distance that the first piston moves from the initial position toward the oil outlet is less than the predetermined distance, the distance between the first piston and the first accommodating groove There is a gap between the second accommodating groove and the first accommodating groove through the gap. When the first piston moves from the initial position toward the oil outlet by a distance equal to or greater than the predetermined distance, the first The piston fills the gap, so that the second accommodating groove is disconnected from the first accommodating groove.

如申請專利範圍第6項所述之自行車煞車把手，更包含一密封環，該密封環位於該第一容置槽及該第二容置槽之間，當該第一活塞從該初始位置朝該出油口移動的距離小於該預定距離時，該縫隙位於該第一活塞及該密封環之間。As described in item 6 of the scope of patent application, the bicycle brake handle further includes a sealing ring located between the first accommodating groove and the second accommodating groove. When the first piston faces from the initial position When the moving distance of the oil outlet is less than the predetermined distance, the gap is located between the first piston and the sealing ring.

如申請專利範圍第7項所述之自行車煞車把手，其中該密封環具有一穿孔，該第一活塞包含相連的一頭部及一身部，該身部的部分位於該第二容置槽，該第二活塞套設於該身部，該第一彈性件之一端連接於該身部，該頭部之至少部分的外徑小於該穿孔的最小孔徑，該身部的外徑大於或等於該穿孔的最小孔徑，當該第一活塞從該初始位置朝該出油口移動的距離小於該預定距離時，該頭部的部分位於該穿孔，該縫隙位於該頭部及該密封環之間，當該第一活塞從該初始位置朝該出油口移動的距離大於該預定距離時，該身部貫穿該穿孔。For the bicycle brake handle described in item 7 of the scope of patent application, wherein the sealing ring has a perforation, the first piston includes a head and a body connected to each other, the body part is located in the second accommodating groove, the The second piston is sleeved on the body, one end of the first elastic member is connected to the body, the outer diameter of at least part of the head is smaller than the minimum hole diameter of the perforation, and the outer diameter of the body is greater than or equal to the perforation When the first piston moves from the initial position toward the oil outlet less than the predetermined distance, the part of the head is located in the perforation, and the gap is located between the head and the seal ring. When the distance that the first piston moves from the initial position toward the oil outlet is greater than the predetermined distance, the body penetrates the through hole.

如申請專利範圍第8項所述之自行車煞車把手，其中該第一活塞之該頭部的外徑自鄰近該出油口的一側朝遠離該出油口的一側漸增，該穿孔之孔徑自鄰近該出油口的一側朝遠離該出油口的一側漸增。The bicycle brake handle described in item 8 of the scope of patent application, wherein the outer diameter of the head of the first piston gradually increases from the side adjacent to the oil outlet to the side away from the oil outlet, and the aperture of the perforation It gradually increases from the side adjacent to the oil outlet to the side away from the oil outlet.

如申請專利範圍第8項所述之自行車煞車把手，更包含一固定件，該固定件位於該密封環與該第二容置槽之間，並與該把手本體沿該密封環之軸向夾持該密封環，該固定件具有一通孔，該通孔的最小孔徑大於該身部的外徑，當該第一活塞從該初始位置朝該出油口移動的距離小於該預定距離時，該身部的部分位於該通孔。The bicycle brake handle described in item 8 of the scope of patent application further includes a fixing member located between the sealing ring and the second accommodating groove, and clamped with the handle body along the axial direction of the sealing ring To hold the sealing ring, the fixing member has a through hole, the minimum diameter of the through hole is larger than the outer diameter of the body, and when the distance of the first piston moving from the initial position toward the oil outlet is less than the predetermined distance, the The body part is located in the through hole.

如申請專利範圍第1項所述之自行車煞車把手，其中該第二活塞包含一主體、一第一外密封環及一第二外密封環，該把手本體具有至少一連通口及一儲油槽，該儲油槽透過該至少一連通口連通於該第二容置槽，該第一外密封環及該第二外密封環套設於該主體並被夾設於該主體及該把手本體之間，該第一外密封環較該第二外密封環遠離該第一容置槽，該至少一連通口位於該第一外密封環鄰近該第一容置槽的一側。The bicycle brake handle described in item 1 of the scope of patent application, wherein the second piston includes a main body, a first outer seal ring and a second outer seal ring, and the handle body has at least one communication port and an oil reservoir, The oil storage tank communicates with the second accommodation tank through the at least one communication port, the first outer sealing ring and the second outer sealing ring are sleeved on the main body and sandwiched between the main body and the handle body, The first outer sealing ring is farther away from the first accommodating groove than the second outer sealing ring, and the at least one communication port is located on a side of the first outer sealing ring adjacent to the first accommodating groove.

如申請專利範圍第11項所述之自行車煞車把手，其中該第二活塞包含一內密封環，該內密封環被夾設於該第一活塞及該主體之間。For the bicycle brake handle described in claim 11, the second piston includes an inner sealing ring, and the inner sealing ring is sandwiched between the first piston and the main body.

如申請專利範圍第1項所述之自行車煞車把手，更包含一止擋環，該止擋環裝設於該第一活塞並位於該第二活塞遠離該第一彈性件的一側，當該第一活塞位於該初始位置時，該第一彈性件令該第二活塞抵靠於該止擋環。For example, the bicycle brake handle described in item 1 of the scope of patent application further includes a stop ring installed on the first piston and located on the side of the second piston away from the first elastic member, when the When the first piston is at the initial position, the first elastic member makes the second piston abut against the stop ring.

如申請專利範圍第1項所述之自行車煞車把手，更包含一第二彈性件，該第二彈性件設置於該第一活塞，用以提供該第一活塞朝遠離該出油口之方向的作用力。For example, the bicycle brake handle described in item 1 of the scope of the patent application further includes a second elastic member disposed on the first piston to provide the first piston facing away from the oil outlet Force.

如申請專利範圍第14項所述之自行車煞車把手，其中該把手本體具有一槽底面，該槽底面面向該第一容置槽，並位於該第一容置槽及該出油口的連接處，該第二彈性件的部分位於該第一容置槽，且該第二彈性件的相對二端分別抵靠該槽底面及該第一活塞。The bicycle brake handle according to item 14 of the scope of patent application, wherein the handle body has a groove bottom surface, the groove bottom surface faces the first accommodating groove, and is located at the junction of the first accommodating groove and the oil outlet A part of the second elastic element is located in the first accommodating groove, and two opposite ends of the second elastic element abut against the bottom surface of the groove and the first piston respectively.

如申請專利範圍第1項所述之自行車煞車把手，其中該第一活塞遠離該第一容置槽之一側具有一凸緣，該第一彈性件套設於該第一活塞，且該第一彈性件的相對二端分別抵靠該凸緣及該第二活塞。For the bicycle brake handle described in claim 1, wherein the first piston has a flange on a side away from the first accommodating groove, the first elastic member is sleeved on the first piston, and the first piston Two opposite ends of an elastic member respectively abut the flange and the second piston.

如申請專利範圍第1項所述之自行車煞車把手，其中該煞車拉桿連接於該第一活塞遠離該出油口之一端。In the bicycle brake handle described in item 1 of the scope of patent application, the brake lever is connected to an end of the first piston away from the oil outlet.