M381052 五、新型說明： 【新型所屬之技術領域】 本創作係有關一種馬達直結驅動壓縮機系統，尤指— 種藉由電動馬達來驅動汽車空調壓縮機之技術。 【先前技術】M381052 V. New description: [New technical field] This creation is related to a motor direct drive compressor system, especially a technology that drives an automotive air conditioner compressor by an electric motor. [Prior Art]
按，汽車空調壓縮機是汽車空調系統關鍵部件，而汽 車空調與建築空調、家庭用空調、固定式空調相比，其L • 作環境較惡劣且工作條件差，此主要體現在以下方面：玉 車外熱負荷變化大，由於汽車是移動物體，外界氣候條件 變化大；2.所要求的空調負荷大’要求降溫迅速；3.汽車長 期處於振動、顛簸環境下，對汽車空調系統要求耐振、防 顛簸；4.汽車長期直接暴露在太陽下，進入駕駛室、乘員 艙熱負荷比一般房間要大得多；5.車體隔熱困難，車内^ 量損失大；6.要求汽車空調機組製冷能力要大。 … • 又，汽車空調壓縮機大部分均由汽車發動機驅動，在 混合動力車、純電動車、燃料電池車上，則由發電機驅動。 .由於壓縮機轉速受發動機轉速影響，轉速變化較大，在台 速到最高轉速之間變化，因此對汽車空調壓縮機提出^ 要求：1.要有良好的低速性能，在低速運轉時有較大製冷 能力。2.高速運轉要求輸入功率低，可節省油耗並能提高 動力性。3.體積小、重量輕。4·能經受惡劣的運行條件，可 靠性要好，要求壓縮機能耐高溫、高壓。在汽車颠薇道路 上高速運行時’部件有良好抗振性，密封性要好。5要求 3 52 壓縮機運行平穩、10喿聲低、振動小。故可知，汽車用空調 壓縮機於使用上係有其別於其他類型壓縮機之嚴格限制。 此外，因目前汽車主要是以内燃機與汽油（或柴油） 作為動力之來源，並以皮帶、皮帶輪等構件經傳動後來驅 動空調壓縮機之啟動；然而，在能源危機以及環保問題日 趨嚴重下，方有上述之油電混合車、純電動車、燃料電池 車等類型車款之出現，其中之油電混合車雖以汽油與電力 做為雙動力源’並以其中之汽油引擎來驅動空調壓縮機， 而此雖可在現有之技術下結合電動車之技術，但大 說L仍有汽油引擎燃燒後之空污環保問題，於未來性上僅 可稱其為過度產品而已，未臻完善。 調二Π 壓縮機等技術來替代車用空 嚴較用魏之問題，故㈣有不適狀問題 綜上所述，如何提供 之空調壓縮機，實為動方式來驅動汽車用 【新型内容】 本創作之主要目沾 馬達直結驅動壓縮機系上述的問題而提供一種 之運轉，進而解決傳統内㈣、馬達來驅動車用I缩機 氣污染問題，進而建到環保要=汽油與柴油為能源下之空 本創作之次一目认 ^ ’而聯軸器之第二麵接邱係f:聯軸斋連接馬達與壓縮機 接°卜結合部與金屬片等構件，整體 而言具構件單純、製作容易、組配方便、成本低等優勢。 為達前述之目的，本創作係包括： 一馬達，其一側設有一驅動軸，該驅動軸端部中央開 設有一第一剖溝，且於該驅動軸同側之外周設有一第一組 接部， 一車用空調之壓縮機，其一侧設有一與該驅動軸相對 之傳動軸，該傳動軸端部中央開設有一與該第一剖溝相對 之第二剖溝； 一聯軸器，係包含一第二組接部、一結合部與一金屬 片，其中該第二組接部係位於該馬達與該壓縮機之間並與 該第一組接部組設，且該第二組接部中央貫設有一開孔， 又該結合部係位於該馬達與該第二組接部之間，且該結合 部一側具有彼此間隔設置之數定位段，該數定位段環繞一 設於該結合部中央之通孔，且該金屬片係位於該馬達與該 結合部間，其中該金屬片一側係後設於該馬達驅動軸之第 一剖溝，而該壓縮機傳動軸並穿伸過該第二組接部之開孔 與該結合部之通孔，且該金屬片之另一側係嵌設於該傳動 軸之第二剖溝，而該傳動轴與驅動軸於該金屬片處之端部 係相互鄰接，並且該驅動軸與傳動軸之外周係鄰接該數定 位段之内周面。 本創作之上述及其他目的與優點，不難從下述所選用 實施例之詳細說明與附圖中，獲得深入了解。 當然，本創作在某些另件上，或另件之安排上容許有 M381052 所不同，但所選用之實施例，則於本說明書中，予以詳細 說明，並於附圖中展示其構造。 【實施方式】 請參閱第1圖至第3圖，圖中所示者為本創作所選用 之實施例結構，此僅供說明之用，在專利申請上並不受此 種結構之限制。 請先參閱第1、2圖，以下係本創作『馬達直結驅動 壓縮機系統』之實施例說明，其係包含： 一馬達1，其一側設有一驅動軸i丄，該驅動軸工端 部中央開設有一第一剖溝1 1 1，以及該驅動軸i丄於其 端部周圍設有一呈縮減狀之第一階級部1 1 2，並且，於 該馬達1上之驅動軸11同側之外周設有一第一組接部1 2，於本實施例中，該第一組接部2 2具有一環繞該驅動 軸11之突出部121，並於該突出部1 2 1外周設有數 個第一結合孔1 2 2，於本例中為四個第一結合孔。 一車用空調之壓縮機2，其一侧設有一與該馬達1驅 動軸1 1相對（例如端部對接）之傳動軸2 1，該傳動軸 2 1端部中央開設有一與該第一剖溝1 1 1相對之第二剖 溝2 1 1，且該傳動轴2 1於其端部周圍設有一呈縮減狀 之第一階級部2 1 2 ’該第一、第二階級部1 1 2、2 1 2之漸縮型態係一致。 一用以連接馬達1與壓縮機2之聯轴器3，係包含一 第二組接部3 1、一結合部3 2與一金屬片3 3，其中該 M381052 Ϊ 一f接部31餘於該馬達1與該壓職2之間並與該 部12組設，於本實施例中，該第二組接部Η j具有—供該第—組接部1 2之突出部i 2 i卡入結合 第I:3 1 1，以及於該第二組接部3 1之外周設有數 f〜口孔3 1 2，於本例中為四個第二結合孔，而該第 ^ —、'.α 口孔1 2 2、3 1 2間可由外部之鎖固件（圖 二未示）鎖設，俾供第…第二組接部12、31組設結 σ ’並且，於該第二組接部3 i中央貫穿财—開孔Η # 3 W及’制合部32係位於該馬達丨肋第二組接部 $ 1之間，該結合部3 2 -侧具有彼此間隔設置之數定位 奴3 2 1，該數定位段3 2 1環繞一設於該結合部3 2中 央之通孔3 2 2 ’於本實施例中，該結合部3 2係為塑膠 材質並具有適度形變恢復力之構造，且各該定位段3 2工 係自該結合部3 2本體上朝外同向伸設而成；並且，該金 屬片3 3係位於該馬達1與該結合部3 2間，而該金屬片 3 3 —側係嵌入設於該馬達丄驅動軸工丄之第一剖溝工工 • 1中，於本實施例中，該金屬片係一鐵片。 而且，而該壓縮機2傳動軸2 1並穿伸過該第二組接 部3 1之開孔3 1 3與該結合部3 2之通孔3 2 2，且該 金屬片3 3之另一側係嵌設於該傳動轴2 ;[之第二剖溝2 1 1，而該傳動轴2 1與驅動轴1 1於供該金屬片3 3嵌 設處之端部係相互鄰接，並且該驅動轴1 1與傳動軸2 1 之外周係鄰接該數定位段321之内周面32 1A。 一基座4，該基座4於其兩側分設有一第一鎖固部4 7 M381052 1與一第二鎖固部4 2，其中該第一鎖固部4 i係與該第 一組接部1 2底部連接鎖固，該第二鎖固部4 2係與該第 厘縮機2底部連接鎖固’於本例中，該第一鎖固部4丄頂 部具有一供馬達1底部承置之弧形凹部4 i丄，且於鄰近 該弧形凹部41 1處之左右兩側分設有一第三結合孔4工 2，該兩第三結合孔4 1 2對應該突出部1 2 1下方之兩 第一結合孔1 2 2，俾供用鎖固件（圓中未示）鎖設；以 及，该第二鎖固部4 2具有一第四結合孔4 2 1，俾供與 該壓縮機2底部之一鎖設部2 2連結鎖固。 詳言之，如第3圖所示，於本實施例中，該壓縮機2 並於該傳動軸2 1外周延伸設有一環形之連接部2 3，該 連接部2 3係插設於該第二組接部3 2之開孔3 1 3，該 連接部2 3外周壁並與該開孔3 1 3處之内周壁抵接定 位，且該連接部2 3之端部更穿伸出該開孔3 1 3外，並 藉一限位件2 3 1將該連接部2 3端部定位於該開孔3 1 3外周。以及，上述該結合部3 2其異於該定位段3 2工 之另一側係抵接於該傳動轴2 1之第二階級部2 1 2之垂 面2 1 2 A上，而該數定位段3 21之内周面32ia係 抵接於該驅動軸11之第一階級部112與該傳動轴21 之第一階級部2 1 2之外周面上，且該傳動軸2 1之端部 係突出於該第二組接部31之開孔313外。 本創作馬達直結驅動壓縮機系統之各構件與組配方式 概如'^述，而在使用上，請參閱第1〜3圖，基本上只要 透過汽車上之電池或其他方式提供電力予馬達1，令該馬 M381052 達1轉動後，動力經由其驅動軸1 1與該傳動軸2 1傳遞 至該壓縮機2，即可令壓縮機2啟動而產生空調之效果， 當然，其中主要是透過該聯軸器3之第二組接部3 1、結 合部3 2與金屬片33，去解決馬達1驅動軸1 1與壓縮 機2傳動軸2 1間之轉動傳遞上之些微誤差，其中並因該 金屬片3 3 (本例為鐵片）與結合部3 2本身具有可適度 形變並恢復之特性，故可於上述之傳遞轉動誤差產生之 時，提供一缓衝餘裕之空間與效果，從而令驅動轴1 1與 Φ 傳動軸2 1間之傳動順暢，進而確保壓縮機2之運作準確 與正常。 綜上所述，可知本創作馬達直結驅動壓縮機系統，係 透過馬達1來驅動車用空調之壓縮機2，故可提供汽車於 驅動方式與替代能源上之方案，藉此以解決傳統内燃機（引 擎）用汽油與柴油為能源下之空氣污染問題，進而達到環 保之目的。 I 同時，透過上述說明可知，本創作使上述技術得以實 現之關鍵：聯軸器3，其第二組接部3 1、結合部3 2與 金屬片3 3等構件，有著構件單純、製作容易、組配方便 等優點，故整體而言具有成本低之優勢，從而於汽車業上 具有極大之競爭力。並且，亦提供了馬達帶動壓縮機啟動 之技術，以解決當前之問題。 以上所述實施例之揭示係用以說明本創作，並非用以 限制本創作，故舉凡數值之變更或等效元件之置換仍應隸 屬本創作之範疇。 9 M381052 由以上詳細說明，可使熟知本項技藝者明瞭本創作的 確可達成前述目的，實已符合專利法之規定，爰提出專利 申請。 【圖式簡單說明】 第1圖係本創作之立體分解示意圖。 第2圖係本創作之立體組合示意圖。 第3圖係本創作之馬達與壓縮機於義器處連接之剖面示 意圖。 【主要元件符號說明】 (習用部分） 無 (本創作部分） 馬達1 第一剖溝1 1 1 第一組接部12 第一結合孔1 2 2 傳動轴2 1 第二階級部2 1 2 鎖設部2 2 限位件2 3 1 驅動抽1 1 第一階級部112 突出部121 壓縮機2 第二剖溝211 垂面2 1 2 A 連接部2 3 聯軸器3 M381052 第二組接部3 1 第二結合孔312 結合部3 2 内周面3 2 1 A 金屬片3 3 第一鎖固部4 1 第三結合孔412 第四結合孔4 2 1 内凹部3 1 1 開孔3 1 3 定位段3 2 1 通孔3 2 2 基座4 弧形凹部41 1 第二鎖固部4 2According to the automobile air-conditioning compressor, it is a key component of the automotive air-conditioning system. Compared with the building air-conditioning, home air-conditioning, and stationary air-conditioning, the air-conditioning system has a poor environment and poor working conditions. This is mainly reflected in the following aspects: jade The thermal load outside the vehicle changes greatly. Because the automobile is a moving object, the external climatic conditions change greatly. 2. The required air conditioning load is large, and the cooling is required to be rapid. 3. The automobile is in a vibrating and bumpy environment for a long time, and the vehicle air conditioning system is required to be resistant to vibration and vibration. Bumpy; 4. The car is directly exposed to the sun for a long time, entering the cab, the passenger cabin heat load is much larger than the general room; 5. The car body is difficult to heat, the car inside the loss is large; 6. Require the refrigeration capacity of the car air conditioning unit Bigger. ... • In addition, most of the automotive air-conditioning compressors are driven by automobile engines. On hybrid vehicles, pure electric vehicles, and fuel cell vehicles, they are driven by generators. Since the compressor speed is affected by the engine speed, the speed changes greatly, and varies between the station speed and the maximum speed. Therefore, the requirements for the automotive air conditioner compressor are as follows: 1. Have good low speed performance, and have better performance at low speed. Large cooling capacity. 2. High-speed operation requires low input power, which saves fuel consumption and improves power. 3. Small size and light weight. 4. It can withstand harsh operating conditions, reliability is good, and the compressor is required to withstand high temperature and high pressure. When running at high speed on the road of the car, the parts have good vibration resistance and good sealing. 5 Requirements 3 52 The compressor runs smoothly, with 10 hum and low vibration. Therefore, it is known that automotive air conditioner compressors have strict limits on their use unlike other types of compressors. In addition, because the current car is mainly powered by internal combustion engines and gasoline (or diesel), and driven by belts, pulleys and other components to drive the start of air-conditioning compressors; however, in the energy crisis and environmental problems become increasingly serious, There are some types of vehicles such as hybrid electric vehicles, pure electric vehicles, fuel cell vehicles, etc., among which the hybrid electric vehicle uses gasoline and electric power as dual power sources, and drives the air conditioning compressor with the gasoline engine. Although this can be combined with the technology of electric vehicles under the existing technology, it is said that L still has the problem of air pollution after burning gasoline engines, and it can only be called excessive products in the future, and it is not perfect. Tune two compressors and other technologies to replace the use of air rigor in the use of Wei, so (four) there are discomfort problems, in summary, how to provide air conditioning compressors, the actual way to drive the car [new content] The main purpose of the creation is to provide a kind of operation for the above problems of the motor direct drive compressor, and to solve the problem of the traditional internal (four), motor to drive the vehicle I reduce the gas pollution, and then to the environmental protection = gasoline and diesel for energy The second part of the creation is the same as the second one. The second side of the coupling is connected to the Qiu system f: the coupling shaft is connected to the motor and the compressor, and the components such as the metal piece are integrally formed. Easy, easy to assemble, low cost and so on. For the purpose of the foregoing, the present invention includes: a motor having a drive shaft on one side thereof, a first split groove in the center of the end of the drive shaft, and a first assembly on the same side of the same side of the drive shaft a compressor for a vehicle air conditioner having a drive shaft opposite to the drive shaft on one side thereof, and a second split groove opposite to the first split groove in the center of the end portion of the drive shaft; a coupling, The system includes a second set of joints, a joint portion and a metal piece, wherein the second set of joints is located between the motor and the compressor and is assembled with the first set of joints, and the second set An opening is disposed in the center of the connecting portion, and the connecting portion is located between the motor and the second connecting portion, and the connecting portion has a plurality of positioning segments spaced apart from each other, and the plurality of positioning segments are disposed around a through hole in the center of the joint portion, and the metal piece is located between the motor and the joint portion, wherein the metal piece side is disposed at a first groove of the motor drive shaft, and the compressor drive shaft is worn through Extending through the opening of the second set of joints and the through hole of the joint portion, and The other side of the metal piece is embedded in the second groove of the transmission shaft, and the transmission shaft and the end of the drive shaft at the metal piece are adjacent to each other, and the drive shaft is adjacent to the outer circumference of the drive shaft. The inner circumference of the number of positioning segments. The above and other objects and advantages of the present invention will become more apparent from the detailed description and the accompanying drawings. Of course, this creation is different from M381052 in some parts, or the arrangement of the parts, but the selected embodiment is explained in detail in the present specification, and its construction is shown in the drawing. [Embodiment] Please refer to Fig. 1 to Fig. 3, which shows the structure of the embodiment selected for the present invention, which is for illustrative purposes only and is not limited by this structure in the patent application. Please refer to the first and second figures. The following is a description of the embodiment of the "motor direct drive compressor system", which includes: a motor 1 having a drive shaft i 一侧 on one side thereof, the drive shaft end portion A first dividing groove 11 1 is defined in the center, and the driving shaft i is disposed around the end portion thereof with a first step portion 1 1 2 having a reduced shape, and the driving shaft 11 on the motor 1 is on the same side. A first assembly portion 1 2 is disposed on the outer circumference. In the embodiment, the first assembly portion 2 2 has a protruding portion 121 surrounding the driving shaft 11 , and a plurality of first portions are disposed on the outer circumference of the protruding portion 1 2 1 . A bonding hole 12 2, in this example, four first bonding holes. a compressor 2 for a vehicle air conditioner is provided with a drive shaft 2 1 opposite to the drive shaft 11 of the motor 1 (for example, the end portion is butted), and a first section is formed at the center of the end of the drive shaft 2 1 . The groove 1 1 1 is opposite to the second groove 2 1 1 , and the transmission shaft 2 1 is provided with a first step portion 2 1 2 2 in a reduced shape around the end portion thereof. The first and second class portions 1 1 2 The 2 1 2 tapered form is consistent. A coupling 3 for connecting the motor 1 and the compressor 2 includes a second assembly portion 3 1 , a joint portion 3 2 and a metal piece 3 3 , wherein the M381052 Ϊ a f connection portion 31 is The motor 1 is disposed between the motor 1 and the pressing portion 2, and in the embodiment, the second connecting portion Η j has a protruding portion i 2 i card for the first connecting portion 1 2 In combination with the first I: 3 1 1 and the outer circumference of the second set of joints 3 1 are provided with a number f to the apertures 3 1 2 , in this example, four second coupling holes, and the first ^, ' .α port 1 2 2, 3 1 2 can be locked by an external lock (not shown in Figure 2), for the second set of junctions 12, 31 set σ ' and in the second group The center of the joint portion 3 i runs through the fiscal opening Η # 3 W and the merging portion 32 is located between the second set of joints 1 1 of the motor ribs, and the side of the joint portion 3 2 - has a plurality of positions spaced apart from each other The slave 3 2 1, the number positioning section 3 2 1 surrounds a through hole 3 2 2 ' disposed in the center of the joint portion 3 2 . In the embodiment, the joint portion 32 is made of a plastic material and has moderate deformation resilience. Structure, and each of the positioning segments 32 is from the combination The body is extended outwardly in the same direction; and the metal piece 3 3 is located between the motor 1 and the joint portion 32, and the metal piece 3 3 is laterally embedded in the motor drive shaft. In the first section of the work, the work piece of the work piece, in the first embodiment, the metal piece is an iron piece. Moreover, the compressor 2 transmits the shaft 2 1 and extends through the opening 3 1 3 of the second set portion 3 1 and the through hole 3 2 2 of the joint portion 3 2 , and the metal piece 3 3 is another One side is embedded in the transmission shaft 2; [the second groove 2 1 1 , and the transmission shaft 21 and the end of the drive shaft 11 at which the metal piece 3 3 is embedded are adjacent to each other, and The drive shaft 1 1 and the outer periphery of the drive shaft 2 1 are adjacent to the inner peripheral surface 32 1A of the plurality of positioning segments 321 . a base 4, the base 4 is provided with a first locking portion 4 7 M381052 1 and a second locking portion 42 on both sides thereof, wherein the first locking portion 4 i is associated with the first group The bottom portion of the connecting portion 1 2 is locked, and the second locking portion 42 is connected to the bottom of the first crimping machine 2 in the present example. The top portion of the first locking portion 4 has a bottom portion for the motor 1 The arcuate recesses 4 i 承 are disposed, and a third coupling hole 4 is disposed adjacent to the left and right sides of the arcuate recess 41 1 , and the two third coupling holes 4 1 2 correspond to the protrusions 1 2 1 below the two first coupling holes 1 22, the lock is provided for the lock (not shown in the circle); and the second lock portion 42 has a fourth joint hole 4 2 1, for the compression One of the lock portions 2 2 at the bottom of the machine 2 is interlocked. In detail, as shown in FIG. 3, in the embodiment, the compressor 2 has an annular connecting portion 2 3 extending from the outer circumference of the transmission shaft 2 1 , and the connecting portion 2 3 is inserted in the first portion. The outer peripheral wall of the connecting portion 2 3 is abutted against the inner peripheral wall of the connecting portion 3 1 3 , and the end portion of the connecting portion 23 extends beyond the outer hole 3 1 3 The opening is outside the opening 3 1 3 , and the end of the connecting portion 23 is positioned on the outer circumference of the opening 3 1 3 by a limiting member 2 3 1 . And the other side of the joint portion 32 is abutted on the vertical surface 2 1 2 A of the second step portion 2 1 2 of the transmission shaft 2 1 , and the number is The inner peripheral surface 32ia of the positioning section 3 21 abuts against the outer surface of the first step portion 112 of the drive shaft 11 and the first step portion 2 1 2 of the drive shaft 21, and the end portion of the drive shaft 2 1 The protrusion protrudes outside the opening 313 of the second set of joints 31. The components and assembly methods of the motor direct-drive compressor system are as described in the figure, and in use, please refer to the figures 1 to 3, basically by supplying power to the motor through the battery or other means on the car. After the horse M381052 reaches 1 rotation, the power is transmitted to the compressor 2 via the drive shaft 1 1 and the transmission shaft 2 1 , so that the compressor 2 can be activated to generate an air conditioner effect. Of course, mainly through the The second set of joints 3 1 of the coupling 3, the joint portion 3 2 and the metal piece 33 solve the slight error in the transmission of the rotation between the drive shaft 1 1 of the motor 1 and the drive shaft 2 1 of the compressor 2, The metal piece 3 3 (in this case, the iron piece) and the joint portion 32 itself have characteristics of being moderately deformed and restored, so that a space and effect of buffering margin can be provided when the above-mentioned transmission rotation error is generated, thereby The transmission between the drive shaft 1 1 and the Φ drive shaft 21 is smooth, thereby ensuring the accuracy and normal operation of the compressor 2. In summary, it can be seen that the present invention directly drives the compressor system, and drives the compressor 2 of the vehicle air conditioner through the motor 1, so that the vehicle can be provided with a driving mode and an alternative energy source, thereby solving the conventional internal combustion engine ( The engine uses gasoline and diesel as the air pollution problem under the energy source, thereby achieving the purpose of environmental protection. I At the same time, through the above description, the present invention enables the above-mentioned technology to be realized: the coupling 3, the second set of joints 3 1 , the joint portion 3 2 and the metal piece 3 3 and the like have simple components and are easy to manufacture. It has the advantages of easy assembly and so on, so it has the advantage of low cost as a whole, so it has great competitiveness in the automotive industry. Also, a motor-driven compressor start-up technology is provided to solve the current problem. The above description of the embodiments is intended to be illustrative of the present invention and is not intended to limit the scope of the present invention. 9 M381052 From the above detailed description, it can be made clear to the skilled person that the creation of the creation can achieve the aforementioned objectives, and it has already met the requirements of the Patent Law and filed a patent application. [Simple description of the diagram] Figure 1 is a three-dimensional exploded view of the creation. Figure 2 is a three-dimensional combination diagram of the creation. Figure 3 is a cross-sectional view showing the connection between the motor and the compressor of the present invention. [Main component symbol description] (customized part) None (this creation part) Motor 1 First groove 1 1 1 First group of joints 12 First joint hole 1 2 2 Drive shaft 2 1 Second stage part 2 1 2 Lock Setting part 2 2 Limiting piece 2 3 1 Driving pumping 1 1 First stage part 112 Projecting part 121 Compressor 2 Second section groove 211 Vertical plane 2 1 2 A Connection part 2 3 Coupling 3 M381052 Second set of joint 3 1 second joint hole 312 joint portion 3 2 inner peripheral surface 3 2 1 A metal sheet 3 3 first lock portion 4 1 third joint hole 412 fourth joint hole 4 2 1 inner recess portion 3 1 1 opening hole 3 1 3 positioning section 3 2 1 through hole 3 2 2 base 4 arcuate recess 41 1 second locking part 4 2
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