CN2496691Y

CN2496691Y - Bicycle middle axle driving air pump

Info

Publication number: CN2496691Y
Application number: CN01245508U
Authority: CN
Inventors: 徐长寿
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-08-17
Filing date: 2001-08-17
Publication date: 2002-06-26
Anticipated expiration: 2011-08-17

Abstract

The utility model relates to a bicycle centre shaft driving gas pump, which includes a cylinder body [5], a piston [3] and an end cap [13]. A piston conical surface [21] is arranged on the internal end of the piston [3]. A sealing ring [16] is arranged on the piston conical surface [21]. The intracavity of the cylinder body [5] between the internal end of the piston [3] and the internal end of the end cap [13] composes a sealing room [19]. The utility model is characterized in that a one-way valve cavity [22] is arranged at the end cap [13] . The air inlet of the one-way valve cavity [22] is communicated with the sealing room [19]. A one-way valve is arranged inside the one-way valve cavity [22]. The external end of the piston [3] is contacted with an eccentric block [2]. The eccentric block [2] is fixed on the bicycle centre shaft [1]. After driving the crank, the centre shaft is driven, and the eccentric block propels the piston automatically, therefore facilitating the operation of pumping in.

Description

Bicycle middle shaft drives air pump

The utility model relates to the air pump that a kind of bicycle uses.

In the prior art, usually use the manual type Floor Pump when bicycle is put on the air, existing Floor Pump is made up of manual rod-type piston rod, cartridge type cylinder, air valve, adaptor union and rubber tube etc., and their volume is bigger, is not easy to place and carry with car.

The purpose of this utility model is to provide a kind of volume bicycle middle shaft little, that can place and carry with car easily to drive air pump.

The technical solution of the utility model is: a kind of bicycle middle shaft drives air pump, comprise cylinder body, be arranged at the piston in the inner chamber of described cylinder body, be arranged at the end cap of the upper end of described cylinder body, the inner end of described piston is provided with the piston conical surface, this piston conical surface is provided with seal ring, the inner chamber of the cylinder body between the inner end of piston and the inner end of end cap constitutes sealed chamber, be provided with spring between the inner end of described piston and the end cap, have unidirectional valve pocket on the described end cap, the induction opening of this unidirectional valve pocket is connected with sealed chamber, is provided with check valve in the unidirectional valve pocket; The outer end of described piston contacts with eccentric block, and described eccentric block is fixed on the axis of bicycle.

The utility model compared with prior art has following advantage:

After driving crank, drive axis and make eccentric block promote piston automatically, make and inflate action easily; In unidirectional valve pocket, be provided with check valve in addition, so the output of the air pressure of air pump is constant.

The utility model will be further described below in conjunction with drawings and Examples:

Accompanying drawing 1 is a structural front view of the present utility model;

Accompanying drawing 2 is the A-A direction cutaway view of accompanying drawing 1; Wherein:

[1], axis; [2], eccentric block; [3], piston; [4], crank; [5], cylinder body; [6], fly nut; [7], fly nut; [8], vehicle frame; [9], fixed mount; [10], clip; [11], joint; [12], flexible pipe; [13], end cap; [14], steel ball; [15], spring; [16], seal ring; [17], induction opening; [18], induction opening; [19], sealed chamber; [20], air gate; [21], the piston conical surface; [22], unidirectional valve pocket;

Embodiment: referring to accompanying drawing 1 and accompanying drawing 2, a kind of bicycle middle shaft drives air pump, comprise cylinder body [5], be arranged at the piston [3] in the inner chamber of described cylinder body [5], be arranged at the end cap [13] of the upper end of described cylinder body [5], the inner end of described piston [3] is provided with the piston conical surface [21], this piston conical surface [21] is provided with seal ring [16], the inner chamber of the cylinder body [5] between the inner end of the inner end of piston [3] and end cap [13] constitutes sealed chamber [19], be provided with spring [15] between the inner end of described piston [3] and the end cap [13], have unidirectional valve pocket [22] on the described end cap [13], the induction opening of this unidirectional valve pocket [22] is connected with sealed chamber [19], and unidirectional valve pocket is provided with check valve in [22]; The outer end of described piston [3] contacts with eccentric block [2], and described eccentric block [2] is fixed on the axis [1] of bicycle.

When piston [3] was mobile air-breathing from top to bottom, air entered sealed chamber [19] from circular clearance, the induction opening [18] between induction opening [17], piston [3] and the cylinder body [5]; When piston [3] moves when calming the anger from the bottom up, pressurized air is close to seal ring [16] on the piston conical surface [21] of piston [3], plays sealing function, and pressurized air is backed down steel ball [14], enters flexible pipe [12] through air gate [20], enters air-inflation tyre at last.

Described check valve is steel ball [14], is provided with bevelled end face at the oral area of the induction opening of described unidirectional valve pocket [22], and described steel ball [14] is positioned on the described tapered end face.When air-breathing, steel ball [14] is pressed on the bevelled end face on the end cap [13], plays sealing function, prevents that the pressurized air in the rubber tube [12] from refluxing, and reduces the moving resistance of piston [3].

Described eccentric block [2] is a disc, and the eccentric position of eccentric block [2] is captiveed joint with axis [1].

Described cylinder body [5] is fixedly connected by fixed mount [9] and vehicle frame [8].The both sides of described fixed mount [9] are enclosed within respectively on cylinder body [5] and the vehicle frame [8].The method that air pump is fixed on the cycle frame is: earlier eccentric block [2] is screwed a side that does not have sprocket wheel on bicycle middle shaft [1], with fly nut [6] and bolt fixed mount [9] is fixed on the cylinder body [5], and then air pump is fixed on the correct position of cycle frame [8] by fly nut [7] and bolt.

Claims

1, a kind of bicycle middle shaft drives air pump, comprise cylinder body [5], be arranged at the piston [3] in the inner chamber of described cylinder body [5], be arranged at the end cap [13] of the upper end of described cylinder body [5], the inner end of described piston [3] is provided with the piston conical surface [21], this piston conical surface [21] is provided with seal ring [16], the inner chamber of the cylinder body [5] between the inner end of the inner end of piston [3] and end cap [13] constitutes sealed chamber [19], be provided with spring [15] between the inner end of described piston [3] and the end cap [13], it is characterized in that: have unidirectional valve pocket [22] on the described end cap [13], the induction opening of this unidirectional valve pocket [22] is connected with sealed chamber [19], and unidirectional valve pocket is provided with check valve in [22]; The outer end of described piston [3] contacts with eccentric block [2], and described eccentric block [2] is fixed on the axis [1] of bicycle.

2, bicycle middle shaft according to claim 1 drives air pump, it is characterized in that: described check valve is steel ball [14], oral area at the induction opening of described unidirectional valve pocket [22] is provided with bevelled end face, and described steel ball [14] is positioned on the described tapered end face.

3, bicycle middle shaft according to claim 1 drives air pump, it is characterized in that: described eccentric block [2] is disc, and the eccentric position of eccentric block [2] is captiveed joint with axis [1].

4, bicycle middle shaft according to claim 1 drives air pump, it is characterized in that: described cylinder body [5] is fixedly connected by fixed mount [9] and vehicle frame [8].

5, bicycle middle shaft according to claim 4 drives air pump, and it is characterized in that: the both sides of described fixed mount [9] are enclosed within respectively on cylinder body [5] and the vehicle frame [8].